Read O-Ring Reference: AS568 Sizes text version

AS568 O-Ring Size Reference

Freudenberg and NOK Group

O-Ring Reference: AS568 Sizes

Yo u r Te c h n o l o g y S p e c i a l i s t

The Simrit O-Ring Design Quick Reference

This design quick reference guide is intended for use in specifying O-ring and groove dimensions for static applications with pressures less than 1500 psi. The guidelines are for the nominal condition. The minimum and maximum conditions should also be checked. This requires looking at the dimensionally largest possible O-ring in the smallest possible groove (i.e., at the hardware and O-ring tolerance stack-up) and the smallest possible O-ring in the largest possible groove. Throughout this reference guide the term "compression" is used for describing what provides the sealing force. Since elastomers are essentially incompressible, the technically correct term would be "deformation." Compression is used, as it is the more commonly used terminology in the industry.

O-Ring Gland Types and Nomenclature

Most static O-ring seals can be classified into one of the three arrangements shown below. The variable names presented in these diagrams are used throughout the quick reference guide.

Piston-Type Seal H Piston

Rod-Type Seal H Rod

Gland W

Gland

W

Bore

Bore

Face-Type Seal Out W

In H

1

Gland Dimension Calculations

Although each physical arrangement is different, typically the O-ring is captured in a rectangular gland. Two opposing surfaces are sealing surfaces, in that the distance between them, the gland height (H), is less than the O-ring cross-section (CS) so that the installed O-ring is compressed, resulting in a sealing force. The other two opposing surfaces are containing surfaces in that the distance between them, the gland width (W), is larger than the O-ring cross-section so that they serve to keep the O-ring in place. Calculations of basic gland dimensions for piston type, rod type and face seals are shown below.

O-Ring Dimensions ID Gland Width (W)

Gland Dimensions

Gland Height (H) OD CS

Sealing Surface

Piston-Type Seal

H= Bore ­ Gland 2 W=W

Rod-Type Seal

H= Gland ­ Rod 2 W=W

Face-Type Seal

H= H W= Out ­ In 2

ID Stretch/OD Interference

The ID or OD of the O-ring should be chosen to minimize the potential for installation damage and to minimize wear during use. For piston-type seals the ID of the O-ring should be smaller than the gland diameter so that the installed O-ring is always slightly stretched, even with the largest possible O-ring ID and smallest possible gland diameter. For rod-type seals the OD of the O-ring should be slightly larger than the gland diameter so that there is always some interference. For external pressure face seals, the ID of the O-ring should be slightly smaller than the inner diameter (In) so that when the pressure is applied, the O-ring is already where it would be as a result of the pressure. For internal pressure face seals, the OD of the O-ring should be slightly larger than the outer diameter (Out) so that when the pressure is applied, the O-ring is already where it would be as a result of the pressure.

Piston-Type Seal

Stretch = Gland ­ ID ID Maximum = 5% Minimum = 0%

External Pressure Face-Type Seal

Stretch = In ­ ID ID Maximum = 5% Minimum = 0%

Rod-Type Seal

Interference = OD ­ Gland OD Maximum = 2% Minimum = 0%

Internal Pressure Face-Type Seal

Interference = OD ­ Out OD Maximum = 3% Minimum = 0%

2

Containing Surface

Sealing Surface

Containing Surface

Reduction in Cross-Section

Since elastomers are essentially incompressible materials, if the ID of the O-ring is stretched, the cross-section of the O-ring will decrease. The following tables give the O-ring cross-sections that result from ID stretch. The new cross-section should be used for all compression and AS568 Series Original Cross-Section in Inches 1% - 0XX -1XX -2XX -3XX -4XX 0.070 in. 0.103 in. 0.139 in. 0.210 in. 0.275 in. .069 .102 .138 .208 .272 gland fill calculations for piston-type and external pressure face seals. The impact of OD interference on the O-ring cross-section varies and does not typically require design considerations.

Reduced Cross-Section at % ID Stretch (inches) 2% .069 .101 .137 .206 .270 3% .068 .100 .136 .205 .268 4% .068 .100 .135 .204 .267 5% .068 .100 .134 .203 .266

AS568 Series

Original Cross-Section in Millimeters 1%

Reduced Cross-Section at % ID Stretch (millimeters) 2% 1.75 2.57 3.47 5.24 6.87 3% 1.74 2.56 3.44 5.20 6.82 4% 1.73 2.55 3.43 5.18 6.79 5% 1.72 2.53 3.41 5.15 6.75

-0XX -1XX -2XX -3XX -4XX

1.78 mm 2.62 mm 3.53 mm 5.33 mm 6.99 mm

1.76 2.59 3.49 5.28 6.92

Compression Squeeze

Compression squeeze is the difference between the original O-ring cross-section (CS) and the gland height (H). It is expressed in either inches or mm.

Compression Squeeze

Compression Squeeze

Calculation

Compression Squeeze = CS ­ H

Recommended Minimum Value

CS H Compression Squeeze > 0.005 inch (0.1 mm)

3

Compression Ratio

The compression ratio is the ratio between compression squeeze and the uncompressed O-ring cross-section. Compression ratio is typically expressed as a percentage.

Calculation

Compression Ratio (%) = Compression Squeeze CS x 100

Recommended Value

Piston- or Rod-Type Seal Minimum: 5% Target: 20% Face-Type Seal Minimum: 10% Maximum: 30%

Target: 25%

Maximum: 35%

Gland Fill

Gland fill is the percentage of the gland that is occupied by the O-ring. It is calculated by dividing the cross-sectional area (CSA) of the O-ring by the cross-sectional area of the gland.

O-Ring Cross-Section Area

O-Ring CSA =

Gland Cross-Section Area

Gland CSA = H x W* W

Gland Fill

Gland Fill (%) = O-Ring CSA Gland CSA x 100

x ( CS

2

)

2

O-Ring CSA

CS H

Gland CSA

* Effect of gland angle not addressed

The following target gland fill recommendations take into account several hardware and O-ring-related factors including but not limited to thermal expansion, volume swell due to fluid exposure, and the effect of tolerance

stack-ups. A gland fill as low as 50% and as high as 90% is acceptable, but it is recommended that the targets shown below be adhered to whenever possible.

Recommended Values

Target Minimum: 65% Target: 75% Target Maximum: 85%

4

Extrusion Gap

Extrusion is a concern for radial seals where there is a gap between the piston and the bore for a piston-type seal or between the rod and the bore for a rod-type seal. It is not typically a concern for face seals where the metal parts to be sealed are in contact line-to-line. The issue is that at higher pressures and especially for softer O-ring elastomers, the O-ring can be forced by the pressure into the small gap between the piston or rod and the bore. Unless the hardware can ensure the bore and the piston or rod remain concentric, we have to assume that all of the gap possible can shift to one side (see diagram below).

Piston-Type Seal

Extrusion Gap = Bore ­ Piston

Rod-Type Seal

Extrusion Gap = Bore ­ Rod

Extrusion

Concentricity and Diametric Clearance

Extrusion Gap

Maximum Possible Extrusion Gap High Pressure

Maximum Recommended Extrusion Gap in Inches (mm)

Pressure Elastomer Hardness (PSI) (Durometer)

60

500 750 1000 1250 1500 .010 (.25) .005 (.13) .002 (.05) .001 (.02) Consult Simrit

70

.015 (.38) .011 (.28) .008 (.20) .004 (.10) .002 (.05)

80

.020 (.51) .016 (.41) .012 (.30) .009 (.23) .007 (.18)

90

.025 (.64) .023 (.58) .018 (.46) .015 (.38) .012 (.30)

For pressures greater than 1500 psi consult Simrit.

5

Other Groove Details

In addition to proper compression and gland fill, a properly designed and machined gland is essential for a good O-ring seal. The tables at the right and the diagram below provide the recommended gland design parameters. In addition, the gland surfaces must be free from all machining irregularities, and the gland edges should be smooth and true and free of nicks, scratches, and burrs. Detail Wall Angle Break Edge Static Sealing Surface Finish Static Contain Surface Finish Inch 0° to 5° .005 to .010 32 µinch maximum 64 µinch maximum mm 0° to 5° .13 to .25 0.8 µm maximum 1.6 µm maximum

Groove Detail Diagram

Wall Angle Sealing Surface

Radius

See table below

AS568 Series

Radius (inch) Min. Max. .015 .015 .025 .035 .035

Radius (mm) Min. .13 .13 .25 .51 .51 Max. .38 .38 .64 .89 .89

Break Edge -0XX Containing Surface Radius -1XX -2XX -3XX Sealing Surface -4XX

.005 .005 .010 .020 .020

Installation Aids

A perfectly designed O-ring seal is of little use if the O-ring is damaged during installation. To prevent installation damage for piston-type and rod-type seals, we recommend a 15° chamfer on the bore or rod. The chamfer must be long enough to ensure that the O-ring sees only the chamfer when it is installed. Face-type seals do not require design considerations beyond the groove detail recommendations offered above. AS568 Series -0XX -1XX -2XX -3XX -4XX O-Ring CS Inches mm .070 .103 .139 .210 .275 1.78 2.62 3.53 5.33 6.99 Chamfer Length Inches mm .083 .122 .157 .236 .283 2.10 3.10 4.00 6.00 7.20

Installation Chamfer Length

6

Properties of Commonly Used Elastomers

Material Name ASTM D1418 Designation

Typical Colors Black White Clear Black White Black Black White Brown Green Black Purple Black Red White Blue

Simriz® FFKM

Super FKM ETP

Aflas TFE/P

Fluorocarbon FKM

Ethylene Propylene EPDM

Nitrile NBR

Silicone VMQ

Fluorosilicone FVMQ

OPERATING TEMPERATURE RANGE Low Temperature High Temperature ­20°C ­4°F 300°C 572°F ­20°C ­4°F 200°C 392°F ­10°C +14°F 200°C 392°F ­40°C ­40°F 250°C 482°F ­55°C ­67°F 150°C 302°F ­50°C ­58°F 120°C 248°F ­75°C ­103°F 230°C 446°F ­65°C ­85°F 180°C 356°F

PHYSICAL PROPERTIES Abrasion Resistance Permeation Resistance Compression Set Resistance Tear Resistance CHEMICAL COMPATIBILITY Inorganic Acids Bases Organic Acids Alcohols Aldehydes Amines Aromatic Hydrocarbons Ether Halogenides Ketone Water Steam (<149°C/300°F) Steam (>149°C/300°F) 1 1 1 2 1 1 2 1 1 1 2 1 1 2 2 1 3 1 3 1 2 3 1 1 4 1 4 4 4 4 1 2 3 1 3 3 4 1 4 1 4 1 2 4 1 1 1 1 4 3 4 1 1 1 4 2 1 3 4 3 4 4 4 1 4 4 3 1 2 2 4 4 4 4 1 3 4 2 1 4 4 1 3 4 4 1 4 4 1 1 1 2 1 1 1 4 1 1 2 2 3 3 2 3 3 2 2 3 2 2 2 3 2 2 2 3 2 1 1 3 1 2 2 1 2 2 1 2 4 4 1 4 4 4 1 4

Material Rating: 1--Little or no effect (volume change <10%) 2--Possible loss of physical properties (volume change 10­20%) 3--Noticeable change (volume change 20­40%) 4--Excessive change (volume change >40%) 0--Insufficient information

7

Elastomer Materials

Simriz® Perfluoroelastomer

Designation: FFKM Description: Excellent resistance to all chemicals. Excellent outgassing performance in vacuum environments. Limitations: Avoid low-molecular-weight, fully halogenated fluids and molten alkali metals. Strong oxidizing acids may cause some swelling. Poor compression set may not be suitable for some applications. Helium permeability is slightly higher than fluoroelastomer compounds. Specific Simriz compounds provide better low-temperature performance and amine resistance. Temperature Range: ­20° to 300°C (­4° to 572°F)

Standard Fluoroelastomers

Designation: FKM Description: Excellent resistance to petroleum products and solvents. Very good high-temperature performance. Fluorocarbon elastomers make up the most widely used seals in the semiconductor industry. Limitations: Avoid polar solvents, amines, anhydrous ammonia, SKYDROL, hydrazine, and hot acids. Temperature Range: ­40° to 200°C (­40° to 392°F)

Hydrocarbon Elastomers--Ethylene-Propylene

Designation: EP, EPDM Description: Excellent resistance to water, steam, and polar solvents, as well as ozone and sunlight. Also resistant to alcohols, glycol engine coolants, and SKYDROL (phosphate ester hydraulic fluid). Divided into sulphur-cured and peroxide-cured types. Peroxide-cured compounds are suitable for higher temperatures and have much lower compression sets. Limitations: Avoid non-polar solvents, petroleum oils, and aromatic fuels. Temperature Range: ­55° to 150°C (­67° to 302°F)

Highly Fluorinated Fluoroelastomers

Designation: ETP (Viton®) Description: Excellent resistance to most chemicals. The performance of these products is greater than traditional fluoroelastomers. Limitations: Contamination performance is somewhat less than Simriz perfluoroelastomer. Avoid service in strong bases or amines. Temperature Range: ­20° to 200°C (­4° to 392°F)

Tetrafluoroethylene/Propylene Elastomers

Designation: TFE/P (Aflas®) Description: Fluorocarbon elastomer noted for exceptional thermal and chemical resistance. Excellent resistance to acids, bases, water, and amines. Widely used in oil fields. Limitations: Avoid polar solvents and aromatic fuels. Compression set performance may be too high for some applications. Temperature Range: ­10° to 200°C (14° to 400°F)

Hydrocarbon Elastomers--Nitrile

Designation: NBR, XNBR, HNBR Description: Very commonly used for O-rings because of its good mechanical properties and low cost. Standard Nitrile is also known as Buna-N. Excellent resistance to petroleum-based oils and fuels, water and alcohols. Nitrile also has good resistance to acids and bases, except those with a strong oxidizing effect. HNBR is obtained by partially or fully hydrogenating NBR leading to considerable improvement of the resistance to heat, ozone, and aging. Limitations: Avoid highly polar solvents (Acetone, MEK, etc.) and direct exposure to ozone and sunlight. Temperature Range: ­55° to 120°C (­65° to 248°F)

8

Viton® is a registered trademarks of DuPont. Aflas® is a registered trademark of Asahi Glass Co.

Elastomer Materials--continued

Silicone Elastomers--Silicone

Designation: MQ, PMQ, VMQ, PVMQ Description: Excellent material for static service at extreme (hot or cold) temperatures. Outstanding flex and fatigue life. Very good for ozone and UV radiation service as well as for resistance to fungal and biological attack. Limitations: Avoid chlorinated solvents, aliphatic and aromatic hydrocarbons and petroleum oils. Silicones are generally very permeable to gases and have poor physical strength and abrasion resistance. Temperature Range: ­115° to 232°C (­175° to 450°F)

Perfluoroether

Designation: FFO Description: Combines low-temperature flexibility, fuel resistance, oil resistance, high-temperature stability, and phosphate ester fluid resistance. Excellent performance in jet fuel, piston and jet engine lubricants, and all types of aircraft hydraulic systems. Limitations: Avoid ketone solvents. Temperature Range: ­65° to 200°C (­85°F to 392°F)

Fluorosilicone Elastomers--Fluorosilicone

Designation: FVMQ Description: Combines excellent low-temperature performance of silicone with improved chemical resistance. Very good resistance to military and aerospace fuels. Excellent performance in oxygen plasma environments. Limitations: Avoid polar solvents, hydrocarbon fluids and phosphate ester brake fluids. Susceptible to hydrolysis by acids and bases. Limited abrasion resistance. Temperature Range: ­60° to 180°C (­76° to 356°F)

Comparative Temperature/Chemical Resistance Limits

SIMRIZ® (FFKM)

HIGH-TEMPERATURE RESISTANCE

Aflas® (TFE/P)

Fluorocarbon (FKM) Fluorosilicone (FVMQ) Silicone (VMQ) Hydrogenated Nitrile (HNBR)

Nitrile (NBR)

CHEMICAL RESISTANCE

9

Six Sigma Quality

Simrit O-rings often exceed Six Sigma levels of quality. By optimizing material and manufacturing processes, Simrit ensures the highest quality output with virtually no manufacturing imperfections. Automated vision systems are often used to double-check characteristics which are imperceptible to the human eye, with the goal of producing better than Six Sigma Quality. What is Six Sigma? Motorola pioneered the notion of Six Sigma Quality as a way to improve processes and decrease defect levels. A process capability index (Cp) is used to measure the relationship between the measured values of a statistical sample and the specified tolerance range. A process with a Cp of 1.00 will use the entire allowable tolerance. This is known as Three Sigma Quality. Six Sigma Quality stresses refining of the process to achieve a Cp of 2.00. As an example of industry standards, the Aerospace O-ring industry is currently operating at about 1.33 Cp for dimensional conformance, with the next target being a 1.67 Cp. Practical Impact of Long-Term Process Capability Sigma Defects per Million Parts 3.4 Defects per Million 233 (DPM) 6,210 (DPM) Cost of Poor Quality

SIX

<10% of sales (World Class) 10­15% of sales 15­20% of sales (Industry Average) 20­30% of sales 30­40% of sales (Noncompetitive) Prohibitive loss of sales

FIVE FOUR

THREE TWO

66,807 (DPM) 308,537 (DPM)

ONE

690,000 (DPM)

The following chart is a literal interpretation of the comparative significance of Sigma Quality levels. Sigma Level Wasted Space Floor space of a small retail store. Floor space of a typical living room. The base area of your typical desk telephone. The size of a computer chip. Lost Time 3 1/2 months in a century. Spell Check 1­2 misspelled words per page in a book. 1 misspelled word per 30 pages in a book. 1 misspelled word in a set of encyclopedias. 1 misspelled word in all the books in a small library.

Three Sigma Four Sigma Five Sigma Six Sigma

3 1/2 days in a century.

30 minutes in a century.

6 seconds in a century.

10

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-001 -002 -003 -004 -005 -006 -007 -008 -009 -010 -011 -012 -013 -014 -015 -016 -017 -018 -019 -020 -021 -022 -023 -024 -025 -026 -027 -028 -029 -030 -031 -032 -033 -034 -035 -036 -037 -038 -039 -040 -041 -042 -043 -044 -045 -046 -047 -048 -049 -050

1/32 3/64 1/16 5/64 3/32 1/8 5/32 3/16 7/32 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1 1/16 1 1/8 1 3/16 1 1/4 1 5/16 1 3/8 1 1/2 1 5/8 1 3/4 1 7/8 2 2 1/8 2 1/4 2 3/8 2 1/2 2 5/8 2 3/4 2 7/8 3 3 1/4 3 1/2 3 3/4 4 4 1/4 4 1/2 4 3/4 5 5 1/4

1/32 3/64 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16

0.029 0.042 0.056 0.070 0.101 0.114 0.145 0.176 0.208 0.239 0.301 0.364 0.426 0.489 0.551 0.614 0.676 0.739 0.801 0.864 0.926 0.989 1.051 1.114 1.176 1.239 1.301 1.364 1.489 1.614 1.739 1.864 1.989 2.114 2.239 2.364 2.489 2.614 2.739 2.864 2.989 3.239 3.489 3.739 3.989 4.239 4.489 4.739 4.989 5.239

0.004 0.004 0.004 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.007 0.009 0.009 0.009 0.009 0.009 0.009 0.010 0.010 0.010 0.011 0.011 0.011 0.013 0.013 0.013 0.015 0.015 0.018 0.018 0.018 0.018 0.018 0.020 0.020 0.020 0.024 0.024 0.024 0.027 0.027 0.030 0.030 0.030 0.037 0.037

0.040 0.050 0.060 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070 0.070

0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003

0.74 1.07 1.42 1.78 2.57 2.90 3.68 4.47 5.28 6.07 7.65 9.25 10.82 12.42 14.00 15.60 17.17 18.77 20.35 21.95 23.52 25.12 26.70 28.30 29.87 31.47 33.05 34.65 37.82 41.00 44.17 47.35 50.52 53.70 56.87 60.05 63.22 66.40 69.57 72.75 75.92 82.27 88.62 94.97 101.32 107.67 114.02 120.37 126.72 133.07

0.10 0.10 0.10 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.18 0.23 0.23 0.23 0.23 0.23 0.23 0.25 0.25 0.25 0.28 0.28 0.28 0.33 0.33 0.33 0.38 0.38 0.46 0.46 0.46 0.46 0.46 0.51 0.51 0.51 0.61 0.61 0.61 0.69 0.69 0.76 0.76 0.76 0.94 0.94

1.02 1.27 1.52 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78

0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08

-001 -002 -003 -004 -005 -006 -007 -008 -009 -010 -011 -012 -013 -014 -015 -016 -017 -018 -019 -020 -021 -022 -023 -024 -025 -026 -027 -028 -029 -030 -031 -032 -033 -034 -035 -036 -037 -038 -039 -040 -041 -042 -043 -044 -045 -046 -047 -048 -049 -050

11

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-102 -103 -104 -105 -106 -107 -108 -109 -110 -111 -112 -113 -114 -115 -116 -117 -118 -119 -120 -121 -122 -123 -124 -125 -126 -127 -128 -129 -130 -131 -132 -133 -134 -135 -136 -137 -138 -139 -140 -141 -142 -143 -144 -145 -146 -147 -148 -149 -150

1/16 3/32 1/8 5/32 3/16 7/32 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1 1/16 1 1/8 1 3/16 1 1/4 1 5/16 1 3/8 1 7/16 1 1/2 1 9/16 1 5/8 1 11/16 1 3/4 1 13/16 1 7/8 1 15/16 2 2 1/16 2 1/8 2 3/16 2 1/4 2 5/16 2 3/8 2 7/16 2 1/2 2 9/16 2 5/8 2 11/16 2 3/4 2 13/16 2 7/8

3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32

0.049 0.081 0.112 0.143 0.174 0.206 0.237 0.299 0.362 0.424 0.487 0.549 0.612 0.674 0.737 0.799 0.862 0.924 0.987 1.049 1.112 1.174 1.237 1.299 1.362 1.424 1.487 1.549 1.612 1.674 1.737 1.799 1.862 1.925 1.987 2.050 2.112 2.175 2.237 2.300 2.362 2.425 2.487 2.550 2.612 2.675 2.737 2.800 2.862

0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.007 0.009 0.009 0.009 0.010 0.010 0.010 0.010 0.010 0.010 0.012 0.012 0.012 0.012 0.012 0.012 0.015 0.015 0.015 0.015 0.015 0.015 0.017 0.017 0.017 0.017 0.017 0.017 0.020 0.020 0.020 0.020 0.020 0.020 0.022 0.022 0.022 0.022

0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103

0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003

1.24 2.06 2.84 3.63 4.42 5.23 6.02 7.59 9.19 10.77 12.37 13.94 15.54 17.12 18.72 20.29 21.89 23.47 25.07 26.64 28.24 29.82 31.42 32.99 34.59 36.17 37.77 39.34 40.94 42.52 44.12 45.69 47.29 48.90 50.47 52.07 53.64 55.25 56.82 58.42 59.99 61.60 63.17 64.77 66.34 67.95 69.52 71.12 72.69

0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.18 0.23 0.23 0.23 0.25 0.25 0.25 0.25 0.25 0.25 0.30 0.30 0.30 0.30 0.30 0.30 0.38 0.38 0.38 0.38 0.38 0.38 0.43 0.43 0.43 0.43 0.43 0.43 0.51 0.51 0.51 0.51 0.51 0.51 0.56 0.56 0.56 0.56

2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62

0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08

-102 -103 -104 -105 -106 -107 -108 -109 -110 -111 -112 -113 -114 -115 -116 -117 -118 -119 -120 -121 -122 -123 -124 -125 -126 -127 -128 -129 -130 -131 -132 -133 -134 -135 -136 -137 -138 -139 -140 -141 -142 -143 -144 -145 -146 -147 -148 -149 -150

12

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-151 -152 -153 -154 -155 -156 -157 -158 -159 -160 -161 -162 -163 -164 -165 -166 -167 -168 -169 -170 -171 -172 -173 -174 -175 -176 -177 -178

3 3 1/4 3 1/2 3 3/4 4 4 1/4 4 1/2 4 3/4 5 5 1/4 5 1/2 5 3/4 6 6 1/4 6 1/2 6 3/4 7 7 1/4 7 1/2 7 3/4 8 8 1/4 8 1/2 8 3/4 9 9 1/4 9 1/2 9 3/4

3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32 3/32

2.987 3.237 3.487 3.737 3.987 4.237 4.487 4.737 4.987 5.237 5.487 5.737 5.987 6.237 6.487 6.737 6.987 7.237 7.487 7.737 7.987 8.237 8.487 8.737 8.987 9.237 9.487 9.737

0.024 0.024 0.024 0.028 0.028 0.030 0.030 0.030 0.035 0.035 0.035 0.035 0.035 0.040 0.040 0.040 0.040 0.045 0.045 0.045 0.045 0.050 0.050 0.050 0.050 0.055 0.055 0.055

0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103 0.103

0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003

75.87 82.22 88.57 94.92 101.27 107.62 113.97 120.32 126.67 133.02 139.37 145.72 152.07 158.42 164.77 171.12 177.47 183.82 190.17 196.52 202.87 209.22 215.57 221.92 228.27 234.62 240.97 247.32

0.61 0.61 0.61 0.71 0.71 0.76 0.76 0.76 0.89 0.89 0.89 0.89 0.89 1.02 1.02 1.02 1.02 1.14 1.14 1.14 1.14 1.27 1.27 1.27 1.27 1.40 1.40 1.40

2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62 2.62

0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08

-151 -152 -153 -154 -155 -156 -157 -158 -159 -160 -161 -162 -163 -164 -165 -166 -167 -168 -169 -170 -171 -172 -173 -174 -175 -176 -177 -178

13

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-201 -202 -203 -204 -205 -206 -207 -208 -209 -210 -211 -212 -213 -214 -215 -216 -217 -218 -219 -220 -221 -222 -223 -224 -225 -226 -227 -228 -229 -230 -231 -232 -233 -234 -235 -236 -237 -238 -239 -240 -241 -242 -243 -244 -245 -246 -247 -248 -249 -250

3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1 1/16 1 1/8 1 3/16 1 1/4 1 5/16 1 3/8 1 7/16 1 1/2 1 5/8 1 3/4 1 7/8 2 2 1/8 2 1/4 2 3/8 2 1/2 2 5/8 2 3/4 2 7/8 3 3 1/8 3 1/4 3 3/8 3 1/2 3 5/8 3 3/4 3 7/8 4 4 1/8 4 1/4 4 3/8 4 1/2 4 5/8 4 3/4 4 7/8 5

1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8

0.171 0.234 0.296 0.359 0.421 0.484 0.546 0.609 0.671 0.734 0.796 0.859 0.921 0.984 1.046 1.109 1.171 1.234 1.296 1.359 1.421 1.484 1.609 1.734 1.859 1.984 2.109 2.234 2.359 2.484 2.609 2.734 2.859 2.984 3.109 3.234 3.359 3.484 3.609 3.734 3.859 3.984 4.109 4.234 4.359 4.484 4.609 4.734 4.859 4.984

0.005 0.005 0.005 0.005 0.005 0.005 0.007 0.009 0.009 0.010 0.010 0.010 0.010 0.010 0.010 0.012 0.012 0.012 0.012 0.012 0.012 0.015 0.015 0.015 0.018 0.018 0.018 0.020 0.020 0.020 0.020 0.024 0.024 0.024 0.024 0.024 0.024 0.024 0.028 0.028 0.028 0.028 0.028 0.030 0.030 0.030 0.030 0.030 0.035 0.035

0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139

0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004

4.34 5.94 7.52 9.12 10.69 12.29 13.87 15.47 17.04 18.64 20.22 21.82 23.39 24.99 26.57 28.17 29.74 31.34 32.92 34.52 36.09 37.69 40.87 44.04 47.22 50.39 53.57 56.74 59.92 63.09 66.27 69.44 72.62 75.79 78.97 82.14 85.32 88.49 91.67 94.84 98.02 101.19 104.37 107.54 110.72 113.89 117.07 120.24 123.42 126.59

0.13 0.13 0.13 0.13 0.13 0.13 0.18 0.23 0.23 0.25 0.25 0.25 0.25 0.25 0.25 0.30 0.30 0.30 0.30 0.30 0.30 0.38 0.38 0.38 0.46 0.46 0.46 0.51 0.51 0.51 0.51 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.71 0.71 0.71 0.71 0.71 0.76 0.76 0.76 0.76 0.76 0.89 0.89

3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53

0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10

-201 -202 -203 -204 -205 -206 -207 -208 -209 -210 -211 -212 -213 -214 -215 -216 -217 -218 -219 -220 -221 -222 -223 -224 -225 -226 -227 -228 -229 -230 -231 -232 -233 -234 -235 -236 -237 -238 -239 -240 -241 -242 -243 -244 -245 -246 -247 -248 -249 -250

14

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-251 -252 -253 -254 -255 -256 -257 -258 -259 -260 -261 -262 -263 -264 -265 -266 -267 -268 -269 -270 -271 -272 -273 -274 -275 -276 -277 -278 -279 -280 -281 -282 -283 -284

5 1/8 5 1/4 5 3/8 5 1/2 5 5/8 5 3/4 5 7/8 6 6 1/4 6 1/2 6 3/4 7 7 1/4 7 1/2 7 3/4 8 8 1/4 8 1/2 8 3/4 9 9 1/4 9 1/2 9 3/4 10 10 1/2 11 11 1/2 12 13 14 15 16 17 18

1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8

5.109 5.234 5.359 5.484 5.609 5.734 5.859 5.984 6.234 6.484 6.734 6.984 7.234 7.484 7.734 7.984 8.234 8.484 8.734 8.984 9.234 9.484 9.734 9.984 10.484 10.984 11.484 11.984 12.984 13.984 14.984 15.955 16.955 17.955

0.035 0.035 0.035 0.035 0.035 0.035 0.035 0.035 0.040 0.040 0.040 0.040 0.045 0.045 0.045 0.045 0.050 0.050 0.050 0.050 0.055 0.055 0.055 0.055 0.055 0.065 0.065 0.065 0.065 0.065 0.065 0.075 0.080 0.085

0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139 0.139

0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004

129.77 132.94 136.12 139.29 142.47 145.64 148.82 151.99 158.34 164.69 171.04 177.39 183.74 190.09 196.44 202.79 209.14 215.49 221.84 228.19 234.54 240.89 247.24 253.59 266.29 278.99 291.69 304.39 329.79 355.19 380.59 405.26 430.66 456.06

0.89 0.89 0.89 0.89 0.89 0.89 0.89 0.89 1.02 1.02 1.02 1.02 1.14 1.14 1.14 1.14 1.27 1.27 1.27 1.27 1.40 1.40 1.40 1.40 1.40 1.65 1.65 1.65 1.65 1.65 1.65 1.91 2.03 2.16

3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53 3.53

0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10

-251 -252 -253 -254 -255 -256 -257 -258 -259 -260 -261 -262 -263 -264 -265 -266 -267 -268 -269 -270 -271 -272 -273 -274 -275 -276 -277 -278 -279 -280 -281 -282 -283 -284

15

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-309 -310 -311 -312 -313 -314 -315 -316 -317 -318 -319 -320 -321 -322 -323 -324 -325 -326 -327 -328 -329 -330 -331 -332 -333 -334 -335 -336 -337 -338 -339 -340 -341 -342 -343 -344 -345 -346 -347 -348 -349 -350

7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 1 1/16 1 1/8 1 3/16 1 1/4 1 5/16 1 3/8 1 1/2 1 5/8 1 3/4 1 7/8 2 2 1/8 2 1/4 2 3/8 2 1/2 2 5/8 2 3/4 2 7/8 3 3 1/8 3 1/4 3 3/8 3 1/2 3 5/8 3 3/4 3 7/8 4 4 1/8 4 1/4 4 3/8 4 1/2 4 5/8

3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16

0.412 0.475 0.537 0.600 0.662 0.725 0.787 0.850 0.912 0.975 1.037 1.100 1.162 1.225 1.287 1.350 1.475 1.600 1.725 1.850 1.975 2.100 2.225 2.350 2.475 2.600 2.725 2.850 2.975 3.100 3.225 3.350 3.475 3.600 3.725 3.850 3.975 4.100 4.225 4.350 4.475 4.600

0.005 0.005 0.007 0.009 0.009 0.010 0.010 0.010 0.010 0.010 0.010 0.012 0.012 0.012 0.012 0.012 0.015 0.015 0.015 0.015 0.018 0.018 0.018 0.018 0.020 0.020 0.020 0.020 0.024 0.024 0.024 0.024 0.024 0.028 0.028 0.028 0.028 0.028 0.030 0.030 0.030 0.030

0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210

0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005

10.46 12.07 13.64 15.24 16.81 18.42 19.99 21.59 23.16 24.77 26.34 27.94 29.51 31.12 32.69 34.29 37.47 40.64 43.82 46.99 50.17 53.34 56.52 59.69 62.87 66.04 69.22 72.39 75.57 78.74 81.92 85.09 88.27 91.44 94.62 97.79 100.97 104.14 107.32 110.49 113.67 116.84

0.13 0.13 0.18 0.23 0.23 0.25 0.25 0.25 0.25 0.25 0.25 0.30 0.30 0.30 0.30 0.30 0.38 0.38 0.38 0.38 0.46 0.46 0.46 0.46 0.51 0.51 0.51 0.51 0.61 0.61 0.61 0.61 0.61 0.71 0.71 0.71 0.71 0.71 0.76 0.76 0.76 0.76

5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33

0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13

-309 -310 -311 -312 -313 -314 -315 -316 -317 -318 -319 -320 -321 -322 -323 -324 -325 -326 -327 -328 -329 -330 -331 -332 -333 -334 -335 -336 -337 -338 -339 -340 -341 -342 -343 -344 -345 -346 -347 -348 -349 -350

16

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-351 -352 -353 -354 -355 -356 -357 -358 -359 -360 -361 -362 -363 -364 -365 -366 -367 -368 -369 -370 -371 -372 -373 -374 -375 -376 -377 -378 -379 -380 -381 -382 -383 -384 -385 -386 -387 -388 -389 -390 -391 -392 -393 -394 -395

4 3/4 4 7/8 5 5 1/8 5 1/4 5 3/8 5 1/2 5 5/8 5 3/4 5 7/8 6 6 1/4 6 1/2 6 3/4 7 7 1/4 7 1/2 7 3/4 8 8 1/4 8 1/2 8 3/4 9 9 1/4 9 1/2 9 3/4 10 10 1/2 11 11 1/2 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16 3/16

4.725 4.850 4.975 5.100 5.225 5.350 5.475 5.600 5.725 5.850 5.975 6.225 6.475 6.725 6.975 7.225 7.475 7.725 7.975 8.225 8.475 8.725 8.975 9.225 9.475 9.725 9.975 10.475 10.975 11.475 11.975 12.975 13.975 14.975 15.955 16.955 17.955 18.955 19.955 20.955 21.955 22.940 23.940 24.940 25.940

0.030 0.030 0.037 0.037 0.037 0.037 0.037 0.037 0.037 0.037 0.037 0.040 0.040 0.040 0.040 0.045 0.045 0.045 0.045 0.050 0.050 0.050 0.050 0.055 0.055 0.055 0.055 0.060 0.060 0.065 0.065 0.065 0.070 0.070 0.075 0.080 0.085 0.090 0.095 0.095 0.100 0.105 0.110 0.115 0.120

0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210 0.210

0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005

120.02 123.19 126.37 129.54 132.72 135.89 139.07 142.24 145.42 148.59 151.77 158.12 164.47 170.82 177.17 183.52 189.87 196.22 202.57 208.92 215.27 221.62 227.97 234.32 240.67 247.02 253.37 266.07 278.77 291.47 304.17 329.57 354.97 380.37 405.26 430.66 456.06 481.45 506.85 532.25 557.65 582.68 608.08 633.48 658.88

0.76 0.76 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 1.02 1.02 1.02 1.02 1.14 1.14 1.14 1.14 1.27 1.27 1.27 1.27 1.40 1.40 1.40 1.40 1.52 1.52 1.65 1.65 1.65 1.78 1.78 1.91 2.03 2.16 2.29 2.41 2.41 2.54 2.67 2.79 2.92 3.05

5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33 5.33

0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13

-351 -352 -353 -354 -355 -356 -357 -358 -359 -360 -361 -362 -363 -364 -365 -366 -367 -368 -369 -370 -371 -372 -373 -374 -375 -376 -377 -378 -379 -380 -381 -382 -383 -384 -385 -386 -387 -388 -389 -390 -391 -392 -393 -394 -395

17

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-425 -426 -427 -428 -429 -430 -431 -432 -433 -434 -435 -436 -437 -438 -439 -440 -441 -442 -443 -444 -445 -446 -447 -448 -449 -450

4 1/2 4 5/8 4 3/4 4 7/8 5 5 1/8 5 1/4 5 3/8 5 1/2 5 5/8 5 3/4 5 7/8 6 6 1/4 6 1/2 6 3/4 7 7 1/4 7 1/2 7 3/4 8 8 1/2 9 9 1/2 10 10 1/2

1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4

4.475 4.600 4.725 4.850 4.975 5.100 5.225 5.350 5.475 5.600 5.725 5.850 5.975 6.225 6.475 6.725 6.975 7.225 7.475 7.725 7.975 8.475 8.975 9.475 9.975 10.475

0.033 0.033 0.033 0.033 0.037 0.037 0.037 0.037 0.037 0.037 0.037 0.037 0.037 0.040 0.040 0.040 0.040 0.045 0.045 0.045 0.045 0.055 0.055 0.055 0.055 0.060

0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275

0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006

113.67 116.84 120.02 123.19 126.37 129.54 132.72 135.89 139.07 142.24 145.42 148.59 151.77 158.12 164.47 170.82 177.17 183.52 189.87 196.22 202.57 215.27 227.97 240.67 253.37 266.07

0.84 0.84 0.84 0.84 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 1.02 1.02 1.02 1.02 1.14 1.14 1.14 1.14 1.40 1.40 1.40 1.40 1.52

6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99

0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15

-425 -426 -427 -428 -429 -430 -431 -432 -433 -434 -435 -436 -437 -438 -439 -440 -441 -442 -443 -444 -445 -446 -447 -448 -449 -450

18

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-451 -452 -453 -454 -455 -456 -457 -458 -459 -460 -461 -462 -463 -464 -465 -466 -467 -468 -469 -470 -471 -472 -473 -474 -475

11 11 1/2 12 12 1/2 13 13 1/2 14 14 1/2 15 15 1/2 16 16 1/2 17 17 1/2 18 18 1/2 19 19 1/2 20 21 22 23 24 25 26

1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4

10.975 11.475 11.975 12.475 12.975 13.475 13.975 14.475 14.975 15.475 15.955 16.455 16.955 17.455 17.955 18.455 18.955 19.455 19.955 20.955 21.955 22.940 23.940 24.940 25.940

0.060 0.060 0.060 0.060 0.060 0.070 0.070 0.070 0.070 0.070 0.075 0.075 0.080 0.085 0.085 0.085 0.090 0.090 0.095 0.095 0.100 0.105 0.110 0.115 0.120

0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275 0.275

0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006

278.77 291.47 304.17 316.87 329.57 342.27 354.97 367.67 380.37 393.07 405.26 417.96 430.66 443.36 456.06 468.76 481.46 494.16 506.86 532.26 557.66 582.68 608.08 633.48 658.88

1.52 1.52 1.52 1.52 1.52 1.78 1.78 1.78 1.78 1.78 1.91 1.91 2.03 2.16 2.16 2.16 2.29 2.29 2.41 2.41 2.54 2.67 2.79 2.92 3.05

6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99 6.99

0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15

-451 -452 -453 -454 -455 -456 -457 -458 -459 -460 -461 -462 -463 -464 -465 -466 -467 -468 -469 -470 -471 -472 -473 -474 -475

19

AS568 Dimensions

AS568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers. Simrit manufactures and supplies the complete range of standard AS568 sizes in a wide range of elastomeric O-ring materials. The following sizes are grouped by cross-section and listed numerically by inside diameter.

AS568 SIZE Nominal (refer.) ID CS Measurements in inches ± CS Measurements in millimeters ID ± CS ± AS568 SIZE

ID

CS OD

ID

±

-901 -902 -903 -904 -905 -906 -907 -908 -909 -910 -911 -912 -913 -914 -916 -918 -920 -924 -928 -932

3/32 1/8 3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 1 1 1/8 1 1/4 1 1/2 1 3/4 2

0.185 0.239 0.301 0.351 0.414 0.468 0.530 0.644 0.706 0.755 0.863 0.924 0.986 1.047 1.171 1.355 1.475 1.720 2.090 2.337

0.005 0.005 0.005 0.005 0.005 0.005 0.007 0.009 0.009 0.009 0.009 0.009 0.010 0.010 0.010 0.012 0.014 0.014 0.018 0.018

0.056 0.064 0.064 0.072 0.072 0.078 0.082 0.087 0.097 0.097 0.116 0.116 0.116 0.116 0.116 0.116 0.118 0.118 0.118 0.118

0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004

4.70 6.07 7.65 8.92 10.52 11.89 13.46 16.36 17.93 19.18 21.92 23.47 25.04 26.59 29.74 34.42 37.47 43.69 53.09 59.36

0.13 0.13 0.13 0.13 0.13 0.13 0.18 0.23 0.23 0.23 0.23 0.23 0.25 0.25 0.25 0.30 0.36 0.36 0.46 0.46

1.42 1.63 1.63 1.83 1.83 1.98 2.08 2.21 2.46 2.46 2.95 2.95 2.95 2.95 2.95 2.95 3.00 3.00 3.00 3.00

0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10

-901 -902 -903 -904 -905 -906 -907 -908 -909 -910 -911 -912 -913 -914 -916 -918 -920 -924 -928 -932

20

AS568 O-Ring Size Reference

Freudenberg and NOK Group

Simrit Americas Plymouth, Michigan, USA Tel: +1 (866) 274 6748 Fax: +1 (734) 354 5500

Simrit Europe Weinheim, Germany Tel: +49 (0) 18 05 ­ 746748 Fax: +49 (0) 18 03 ­ 746748

Simrit China Shanghai, China Tel: +86 (21) 50 36 69 00 Fax: +86 (21) 50 36 63 07

www.simrit.com

Publication No. 2701 © 2007 Simrit

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O-Ring Reference: AS568 Sizes

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