Standard O-Rings are available in 369 sizes as set up by the Aerospace Standard 568 published by the Society of Automotive Engineers. These sizes are designated by dash numbers shown on the 568 DASH Chart and are standardized by imperial dimensions. Standard O-Rings are specified by their inside diameter and cross section width. AS568 is the most commonly used standard in the U.S. for aerospace, automotive and general industrial applications. For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart. EP is also known as: Eythylene Propylene, EPR, EPDM, EPT, E.

EP is an elastomer which is characterized by wide range of applications and good chemical resistance. Ethylene propylene compounds have good resistance to detergents, alkalis, mild acids, greases, silicone oils, and alcohols.
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Cross Section Width (in)

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Inside Diameter (in)

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Type

Material

Cross Section Width

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Inside Diameter

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Inside Diameter Tolerance +/-

Size Reference - AS568

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N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.056 in N/A 75 N/A 0.185 mm0.185 in N/A 0.003 in N/A 0.005 in N/A -901 N/A N/A Imperial Imperial N/A 3/32 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.056 in N/A 90 N/A 0.185 mm0.185 in N/A 0.003 in N/A 0.005 in N/A -901 N/A N/A Imperial Imperial N/A 3/32 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.064 in N/A 90 N/A 0.239 mm0.239 in N/A 0.003 in N/A 0.005 in N/A -902 N/A N/A Imperial Imperial N/A 1/8 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.064 in N/A 75 N/A 0.239 mm0.239 in N/A 0.003 in N/A 0.005 in N/A -902 N/A N/A Imperial Imperial N/A 1/8 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.064 in N/A 75 N/A 0.301 mm0.301 in N/A 0.003 in N/A 0.005 in N/A -903 N/A N/A Imperial Imperial N/A 3/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.064 in N/A 90 N/A 0.301 mm0.301 in N/A 0.003 in N/A 0.005 in N/A -903 N/A N/A Imperial Imperial N/A 3/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.064 in N/A 70 N/A 0.301 mm0.301 in N/A 0.003 in N/A 0.005 in N/A -903 N/A N/A Imperial Imperial N/A 3/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.072 in N/A 70 N/A 0.351 mm0.351 in N/A 0.003 in N/A 0.005 in N/A -904 N/A N/A Imperial Imperial N/A 1/4 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.v
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.072 in N/A 90 N/A 0.351 mm0.351 in N/A 0.003 in N/A 0.005 in N/A -904 N/A N/A Imperial Imperial N/A 1/4 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.072 in N/A 75 N/A 0.351 mm0.351 in N/A 0.003 in N/A 0.005 in N/A -904 N/A N/A Imperial Imperial N/A 1/4 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.072 in N/A 75 N/A 0.414 mm0.414 in N/A 0.003 in N/A 0.005 in N/A -905 N/A N/A Imperial Imperial N/A 5/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.072 in N/A 90 N/A 0.414 mm0.414 in N/A 0.003 in N/A 0.005 in N/A -905 N/A N/A Imperial Imperial N/A 5/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.072 in N/A 70 N/A 0.414 mm0.414 in N/A 0.003 in N/A 0.005 in N/A -905 N/A N/A Imperial Imperial N/A 5/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.078 in N/A 70 N/A 0.468 mm0.468 in N/A 0.003 in N/A 0.005 in N/A -906 N/A N/A Imperial Imperial N/A 3/8 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.078 in N/A 90 N/A 0.468 mm0.468 in N/A 0.003 in N/A 0.005 in N/A -906 N/A N/A Imperial Imperial N/A 3/8 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.078 in N/A 75 N/A 0.468 mm0.468 in N/A 0.003 in N/A 0.005 in N/A -906 N/A N/A Imperial Imperial N/A 3/8 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.082 in N/A 75 N/A 0.530 mm0.530 in N/A 0.003 in N/A 0.005 in N/A -907 N/A N/A Imperial Imperial N/A 7/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.082 in N/A 90 N/A 0.530 mm0.530 in N/A 0.003 in N/A 0.005 in N/A -907 N/A N/A Imperial Imperial N/A 7/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.082 in N/A 70 N/A 0.530 mm0.530 in N/A 0.003 in N/A 0.005 in N/A -907 N/A N/A Imperial Imperial N/A 7/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.087 in N/A 70 N/A 0.644 mm0.644 in N/A 0.003 in N/A 0.009 in N/A -908 N/A N/A Imperial Imperial N/A 1/2 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.087 in N/A 90 N/A 0.644 mm0.644 in N/A 0.003 in N/A 0.009 in N/A -908 N/A N/A Imperial Imperial N/A 1/2 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.087 in N/A 75 N/A 0.644 mm0.644 in N/A 0.003 in N/A 0.009 in N/A -908 N/A N/A Imperial Imperial N/A 1/2 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.097 in N/A 75 N/A 0.706 mm0.706 in N/A 0.003 in N/A 0.009 in N/A -909 N/A N/A Imperial Imperial N/A 9/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.097 in N/A 90 N/A 0.706 mm0.706 in N/A 0.003 in N/A 0.009 in N/A -909 N/A N/A Imperial Imperial N/A 9/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
N/A AS568 Standard O-Rings AS568 Standard O-Rings N/A EP EP N/A 0.097 in N/A 70 N/A 0.706 mm0.706 in N/A 0.003 in N/A 0.009 in N/A -909 N/A N/A Imperial Imperial N/A 9/16 3/32 N/A N/A O-rings are used in the military defense and agriculture industries.
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