O-Rings

Description

An O-ring, also known as a packing, or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.

O-Rings are the most common form of general purpose seal.

How does an O-Ring work?

The compression (or more accurately the deformation) of the O-ring provides part of the sealing function. An additional sealing function is realized when the O-ring is activated by the pressure of the gas or liquid that the O-ring serves to contain. The containment surface ensures that the sealing function is maintained by keeping the O-ring where it needs to be. As pressure is applied to the seal the inherent flexibility of the material, and resistance to change of volume, transfer the pressure to the axis of compression.

Please download our O ring design guide for more detailed information.

Download our Design Guide

kc seals design guide o ring

pdfO-Ring Design Guide

Available Materials

Nitriles (NBR, HNBR, XNBR)

DescriptionMaterial CodeData Sheet
NBR 70D0101pdfNBR 70
NBR 90D0102pdfNBR 90
HNBR 70D0120pdfHNBR 70
HNBR 80D0121pdfHNBR 80
HNBR 90D0122pdfHNBR 90
XNBR 70D0130pdfXNBR 70

Fluoroelastomers (FKM, Viton®, TFE/P, Aflas®)

DescriptionMaterial CodeData Sheet
Viton® 75D0201pdfViton® 75
Viton® 90D0202pdfViton® 90
High Performance FKMCV75pdfHigh Performance FKM
Aflas® 80D0210pdfAflas® 80D
Low Compression Set FKM0203pdfLow Compression Set FKM
Low Temp FKM0204pdfLow Temp FKM
FDA Compliant FKM0278pdfFDA Compliant FKM

Perfluoroelastomers (FFKM, Simriz®)

DescriptionMaterial CodeData Sheet
Extreme High Temp and Steam resistance498pdfSZ498 High Temp/Low Compression Set FFKM
Broad Chemical Resistance485pdfSZ485 Broad Chemical Resistance
General Purpose Semiconductor486pdfSZ486 General Purpose, Semiconductor
General Purpose FFKM481pdfGeneral Purpose FFKM
High Durometer FFKM134pdfHigh Durometer FFKM

Ethylene Propylene Diene Monomer (EPDM)

DescriptionMaterial CodeData Sheet
General Purpose EPDM0301pdfGeneral Purpose EPDM
Low Density EPDM0305pdfLow Density EPDM

Silicone (VMQ)

DescriptionMaterial CodeData Sheet
General Purpose VMQ0601pdfGeneral Purpose VMQ
Low Duro VMQ0604pdfLow Duro VMQ

Fluorosilicone (FVMQ)

DescriptionMaterial CodeData Sheet
General Purpose FVMQ0501pdfGeneral Purpose FVMQ
Low Duro FVMQ PTFE0502pdfLow Duro FVMQ PTFE
Lubricated FVMQ0503pdfLubricated FVMQ
Sizing information & Part Numbers

For more detailed information regarding gland house recommendations and specification, please refer to our O-Ring design guide

SAE AS568 Sizing guide
“0” Series Sizes

AS 568NOMINAL(REF.)MEASUREMENTS IN INCHES
SizeIDCSIDTOLERANCE ±CS
~0011/321/320.0290.0040.040
~0023/643/640.0420.0040.050
~0031/161/160.0560.0040.060
~0045/641/160.0700.0050.070
~0053/321/160.1010.0050.070
~0061/81/160.1140.0050.070
~0075/321/160.1450.0050.070
~0083/161/160.1760.0050.070
~0097/321/160.2080.0050.070
~0101/41/160.2390.0050.070
~0115/161/160.3010.0050.070
~0123/81/160.3640.0050.070
~0137/161/160.4260.0050.070
~0141/21/160.4890.0050.070
~0159/161/160.5510.0070.070
~0165/81/160.6140.0090.070
~01711/161/160.6760.0090.070
~0183/41/160.7390.0090.070
~01913/161/160.8010.0090.070
~0207/81/160.8640.0090.070
~02115/161/160.9260.0090.070
~02211/160.9890.0100.070
~0231 1/161/161.0510.0100.070
~0241 1/81/161.1140.0100.070
~0251 3/161/161.1760.0110.070
~0261 1/41/161.2390.0110.070
~0271 5/161/161.3010.0110.070
~0281 3/81/161.3640.0130.070
~0291 1/21/161.4890.0130.070
~0301 5/81/161.6140.0130.070
~0311 3/41/161.7390.0150.070
~0321 7/81/161.8640.0150.070
~03321/161.9890.0180.070
~0342 1/81/162.1140.0180.070
~0352 1/41/162.2390.0180.070
~0362 3/81/162.3640.0180.070
~0372 1/21/162.4890.0180.070
~0382 5/81/162.6140.0200.070
~0392 3/41/162.7390.0200.070
~0402 7/81/162.8640.0200.070
~04131/162.9890.0240.070
~0423 1/41/163.2390.0240.070
~0433 1/21/163.4890.0240.070
~0443 3/41/163.7390.0270.070
~04541/163.9890.0270.070
~0464 1/41/164.2390.0300.070
~0474 1/21/164.4890.0300.070
~0484 3/41/164.7390.0300.070
~04951/164.9890.0370.070
~0505 1/41/165.2390.0370.070

“100” Series Sizes

AS 568NOMINAL(REF.)MEASUREMENTS IN INCHES
SizeIDCSIDTOLERANCE ±CS
~1021/163/320.0490.0050.103
~1033/323/320.0810.0050.103
~1041/83/320.1120.0050.103
~1055/323/320.1430.0050.103
~1063/163/320.1740.0050.103
~1077/323/320.2060.0050.103
~1081/43/320.2370.0050.103
~1095/163/320.2990.0050.103
~1103/83/320.3620.0050.103
~1117/163/320.4240.0050.103
~1121/23/320.4870.0050.103
~1139/163/320.5490.0070.103
~1145/83/320.6120.0090.103
~11511/163/320.6740.0090.103
~1163/43/320.7370.0090.103
~11713/163/320.7990.0100.103
~1187/83/320.8620.0100.103
~11915/163/320.9240.0100.103
~12013/320.9870.0100.103
~1211 1/163/321.0490.0100.103
~1221 1/83/321.1120.0100.103
~1231 3/163/321.1740.0120.103
~1241 1/43/321.2370.0120.103
~1251 5/163/321.2990.0120.103
~1261 3/83/321.3620.0120.103
~1271 7/163/321.4240.0120.103
~1281 1/23/321.4870.0120.103
~1291 9/163/321.5490.0150.103
~1301 5/83/321.6120.0150.103
~1311 11/163/321.6740.0150.103
~1321 3/43/321.7370.0150.103
~1331 13/163/321.7990.0150.103
~1341 7/83/321.8620.0150.103
~1351 15/163/321.9250.0170.103
~13623/321.9870.0170.103
~1372 1/163/322.0500.0170.103
~1382 1/83/322.1120.0170.103
~1392 3/163/322.1750.0170.103
~1402 1/43/322.2370.0170.103
~1412 5/163/322.3000.0200.103
~1422 3/83/322.3620.0200.103
~1432 7/163/322.4250.0200.103
~1442 1/23/322.4870.0200.103
~1452 9/163/322.5500.0200.103
~1462 5/83/322.6120.0200.103
~1472 11/163/322.6750.0220.103
~1482 3/43/322.7370.0220.103
~1492 13/163/322.8000.0220.103
~1502 7/83/322.8620.0220.103
~15133/322.9870.0240.103
~1523 1/43/323.2370.0240.103
~1533 1/23/323.4870.0240.103
~1543 3/43/323.7370.0280.103
~15543/323.9870.0280.103
~1564 1/43/324.2370.0300.103
~1574 1/23/324.4870.0300.103
~1584 3/43/324.7370.0350.103
~15953/324.9870.0350.103
~1605 1/43/325.2370.0350.103
~1615 1/23/325.4870.0350.103
~1625 3/43/325.7370.0350.103
~16363/325.9870.0350.103
~1646 1/43/326.2370.0400.103
~1656 1/23/326.4870.0400.103
~1666 3/43/326.7370.0400.103
~16773/326.9870.0400.103
~1687 1/43/327.2370.0450.103
~1697 1/23/327.4870.0450.103
~1707 3/43/327.7370.0450.103
~17183/327.9870.0450.103
~1728 1/43/328.2370.0500.103
~1738 1/23/328.4870.0500.103
~1748 3/43/328.7370.0500.103
~17593/328.9870.0500.103
~1769 1/43/329.2370.0550.103
~1779 1/23/329.4870.0550.103
~1789 3/43/329.7370.0550.103

“200” Series Sizes

AS 568NOMINAL(REF.)MEASUREMENTS IN INCHES
SizeIDCSIDTOLERANCE ±CS
~2013/161/80.1710.0050.139
~2021/41/80.2340.0050.139
~2035/161/80.2960.0050.139
~2043/81/80.3590.0050.139
~2057/161/80.4210.0050.139
~2061/21/80.4840.0050.139
~2079/161/80.5460.0070.139
~2085/81/80.6090.0090.139
~20911/161/80.6710.0090.139
~2103/41/80.7340.0100.139
~21113/161/80.7960.0100.139
~2127/81/80.8590.0100.139
~21315/161/80.9210.0100.139
~21411/80.9840.0100.139
~2151 1/161/81.0460.0100.139
~2161 1/81/81.1090.0120.139
~2171 3/161/81.1710.0120.139
~2181 1/41/81.2340.0120.139
~2191 5/161/81.2960.0120.139
~2201 3/81/81.3590.0120.139
~2211 7/161/81.4210.0120.139
~2221 1/21/81.4840.0150.139
~2231 5/81/81.6090.0150.139
~2241 3/41/81.7340.0150.139
~2251 7/81/81.8590.0180.139
~22621/81.9840.0180.139
~2272 1/81/82.1090.0180.139
~2282 1/41/82.2340.0200.139
~2292 3/81/82.3590.0200.139
~2302 1/21/82.4840.0200.139
~2312 5/81/82.6090.0200.139
~2322 3/41/82.7340.0240.139
~2332 7/81/82.8590.0240.139
~23431/82.9840.0240.139
~2353 1/81/83.1090.0240.139
~2363 1/41/83.2340.0240.139
~2373 3/81/83.3590.0240.139
~2383 1/21/83.4840.0240.139
~2393 5/81/83.6090.0280.139
~2403 3/41/83.7340.0280.139
~2413 7/81/83.8590.0280.139
~24241/83.9840.0280.139
~2434 1/81/84.1090.0280.139
~2444 1/41/84.2340.0300.139
~2454 3/81/84.3590.0300.139
~2464 1/21/84.4840.0300.139
~2474 5/81/84.6090.0300.139
~2484 3/41/84.7340.0300.139
~2494 7/81/84.8590.0350.139
~25051/84.9840.0350.139
~2515 1/81/85.1090.0350.139
~2525 1/41/85.2340.0350.139
~2535 3/81/85.3590.0350.139
~2545 1/21/85.4840.0350.139
~2555 5/81/85.6090.0350.139
~2565 3/41/85.7340.0350.139
~2575 7/81/85.8590.0350.139
~25861/85.9840.0350.139
~2596 1/41/86.2340.0400.139
~2606 1/21/86.4840.0400.139
~2616 3/41/86.7340.0400.139
~26271/86.9840.0400.139
~2637 1/41/87.2340.0450.139
~2647 1/21/87.4840.0450.139
~2657 3/41/87.7340.0450.139
~26681/87.9840.0450.139
~2678 1/41/88.2340.0500.139
~2688 1/21/88.4840.0500.139
~2698 3/41/88.7340.0500.139
~27091/88.9840.0500.139
~2719 1/41/89.2340.0550.139
~2729 1/21/89.4840.0550.139
~2739 3/41/89.7340.0550.139
~274101/89.9840.0550.139
~27510 1/21/810.4840.0550.139
~276111/810.9840.0650.139
~27711 1/21/811.4840.0650.139
~278121/811.9840.0650.139
~279131/812.9840.0650.139
~280141/813.9840.0650.139
~281151/814.9840.0650.139
~282161/815.9550.0750.139
~283171/816.9550.0800.139
~284181/817.9550.0850.139

“300” Series Sizes

AS 568NOMINAL(REF.)MEASUREMENTS IN INCHES
SizeIDCSIDTOLERANCE ±CS
~3097/163/160.4120.0050.21
~3101/23/160.4750.0050.21
~3119/163/160.5370.0070.21
~3125/83/160.6000.0090.21
~31311/163/160.6620.0090.21
~3143/43/160.7250.0100.21
~31513/163/160.7870.0100.21
~3167/83/160.8500.0100.21
~31715/163/160.9120.0100.21
~31813/160.9750.0100.21
~3191 1/163/161.0370.0100.21
~3201 1/83/161.1000.0120.21
~3211 3/163/161.1620.0120.21
~3221 1/43/161.2250.0120.21
~3231 5/163/161.2870.0120.21
~3241 3/83/161.3500.0120.21
~3251 1/23/161.4750.0150.21
~3261 5/83/161.6000.0150.21
~3271 3/43/161.7250.0150.21
~3281 7/83/161.8500.0150.21
~32923/161.9750.0180.21
~3302 1/83/162.1000.0180.21
~3312 1/43/162.2250.0180.21
~3322 3/83/162.3500.0180.21
~3332 1/23/162.4750.0200.21
~3342 5/83/162.6000.0200.21
~3352 3/43/162.7250.0200.21
~3362 7/83/162.8500.0200.21
~33733/162.9750.0240.21
~3383 1/83/163.1000.0240.21
~3393 1/43/163.2250.0240.21
~3403 3/83/163.3500.0240.21
~3413 1/23/163.4750.0240.21
~3423 5/83/163.6000.0280.21
~3433 3/43/163.7250.0280.21
~3443 7/83/163.8500.0280.21
~34543/163.9750.0280.21
~3464 1/83/164.1000.0280.21
~3474 1/43/164.2250.0300.21
~3484 3/83/164.3500.0300.21
~3494 1/23/164.4750.0300.21
~3504 5/83/164.6000.0300.21
~3514 3/43/164.7250.0300.21
~3524 7/83/164.8500.0300.21
~35353/164.9750.0370.21
~3545 1/83/165.1000.0370.21
~3555 1/43/165.2250.0370.21
~3565 3/83/165.3500.0370.21
~3575 1/23/165.4750.0370.21
~3585 5/83/165.6000.0370.21
~3595 3/43/165.7250.0370.21
~3605 7/83/165.8500.0370.21
~36163/165.9750.0370.21
~3626 1/43/166.2250.0400.21
~3636 1/23/166.4750.0400.21
~3646 3/43/166.7250.0400.21
~36573/166.9750.0400.21
~3667 1/43/167.2250.0450.21
~3677 1/23/167.4750.0450.21
~3687 3/43/167.7250.0450.21
~36983/167.9750.0450.21
~3708 1/43/168.2250.0500.21
~3718 1/23/168.4750.0500.21
~3728 3/43/168.7250.0500.21
~37393/168.9750.0500.21
~3749 1/43/169.2250.0550.21
~3759 1/23/169.4750.0550.21
~3769 3/43/169.7250.0550.21
~377103/169.9750.0550.21
~37810 1/23/1610.4750.0600.21
~379113/1610.9750.0600.21
~38011 1/23/1611.4750.0650.21
~381123/1611.9750.0650.21
~382133/1612.9750.0650.21
~383143/1613.9750.0700.21
~384153/1614.9750.0700.21
~385163/1615.9550.0750.21
~386173/1616.9550.0800.21
~387183/1617.9550.0850.21
~388193/1618.9550.0900.21
~389203/1619.9550.0950.21
~390213/1620.9550.0950.21
~391223/1621.9550.1000.21
~392233/1622.9400.1050.21
~393243/1623.9400.1100.21
~394253/1624.9400.1150.21
~395263/1625.9400.1200.21

“400” Series Sizes

AS 568NOMINAL(REF.)MEASUREMENTS IN INCHES
SizeIDCSIDTOLERANCE ±CS
~4254 1/21/44.4750.0330.275
~4264 5/81/44.6000.0330.275
~4274 3/41/44.7250.0330.275
~4284 7/81/44.8500.0330.275
~42951/44.9750.0370.275
~4305 1/81/45.1000.0370.275
~4315 1/41/45.2250.0370.275
~4325 3/81/45.3500.0370.275
~4335 1/21/45.4750.0370.275
~4345 5/81/45.6000.0370.275
~4355 3/41/45.7250.0370.275
~4365 7/81/45.8500.0370.275
~43761/45.9750.0370.275
~4386 1/41/46.2250.0400.275
~4396 1/21/46.4750.0400.275
~4406 3/41/46.7250.0400.275
~44171/46.9750.0400.275
~4427 1/41/47.2250.0450.275
~4437 1/21/47.4750.0450.275
~4447 3/41/47.7250.0450.275
~44581/47.9750.0450.275
~4468 1/21/48.4750.0550.275
~44791/48.9750.0550.275
~4489 1/21/49.4750.0550.275
~449101/49.9750.0550.275
~45010 1/21/410.4750.0600.275
~451111/410.9750.0600.275
~45211 1/21/411.4750.0600.275
~453121/411.9750.0600.275
~45412 1/21/412.4750.0600.275
~455131/412.9750.0600.275
~45613 1/21/413.4750.0700.275
~457141/413.9750.0700.275
~45814 1/21/414.4750.0700.275
~459151/414.9750.0700.275
~46015 1/21/415.4750.0700.275
~461161/415.9550.0750.275
~46216 1/21/416.4550.0750.275
~463171/416.9550.0800.275
~46417 1/21/417.4550.0850.275
~465181/417.9550.0850.275
~46618 1/21/418.4550.0850.275
~467191/418.9550.0900.275
~46819 1/21/419.4550.0900.275
~469201/419.9550.0950.275
~470211/420.9550.0950.275
~471221/421.9550.1000.275
~472231/422.9400.1050.275
~473241/423.9400.1100.275
~474251/424.9400.1150.275
~475261/425.9400.1200.275

“900” Series Sizes

AS 568NOMINAL(REF.)MEASUREMENTS IN INCHES
SizeIDCSIDTOLERANCE ±CS
~9013/320.1850.0050.056
~9021/80.2390.0050.064
~9033/160.3010.0050.064
~9041/40.3510.0050.072
~9055/160.4140.0050.072
~9063/80.4680.0050.078
~9077/160.5300.0070.082
~9081/20.6440.0090.087
~9099/160.7060.0090.097
~9105/80.7550.0090.097
~91111/160.8630.0090.116
~9123/40.9240.0090.116
~91313/160.9860.0100.116
~9147/81.0470.0100.116
~91611.1710.0100.116
~9181 1/81.3550.0120.116
~9201 1/41.4750.0140.118
~9241 1/21.7200.0140.118
~9281 3/42.0900.0180.118
~93222.3370.0180.118