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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.

Polyurethane is also known as urethane, cast urethan and millable urethane. Exceptional tensile strength. Abrasion and low temperature resistance. Typical applications include hydraulic seals, gaskets, diaphragms, hoses, and wheels for skate boards.

For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
AS568 Buna O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

Cross Section Tolerance +/-

Inside Diameter Tolerance +/-

Size Reference - AS568

Alternate P/N

Units of Measure

Tube Size O.D.

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O-Ring Industries

Quantity
-236 U-90 N/A
191196 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 82.14 mm3.234 in N/A 0.004 in0.10 mm N/A 0.024 in0.61 mm N/A -236 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-237 U-70 N/A
191197 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 85.32 mm3.359 in N/A 0.004 in0.10 mm N/A 0.024 in0.61 mm N/A -237 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-237 U-90 N/A
191198 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 85.32 mm3.359 in N/A 0.004 in0.10 mm N/A 0.024 in0.61 mm N/A -237 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-238 U-70 N/A
191199 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 88.49 mm3.484 in N/A 0.004 in0.10 mm N/A 0.024 in0.61 mm N/A -238 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-238 U-90 N/A
191200 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 88.49 mm3.484 in N/A 0.004 in0.10 mm N/A 0.024 in0.61 mm N/A -238 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-239 U-70 N/A
191201 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 91.67 mm3.609 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -239 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-239 U-90 N/A
191202 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 91.67 mm3.609 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -239 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-240 U-70 N/A
191203 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 94.84 mm3.734 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -240 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-240 U-90 N/A
191204 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 94.84 mm3.734 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -240 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-241 U-70 N/A
191205 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 98.02 mm3.859 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -241 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.v
-241 U-90 N/A
191206 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 98.02 mm3.859 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -241 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-242 U-70 N/A
191207 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 101.19 mm3.984 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -242 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-242 U-90 N/A
191208 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 101.19 mm3.984 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -242 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-243 U-70 N/A
191209 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 104.37 mm4.109 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -243 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-243 U-90 N/A
191210 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 104.37 mm4.109 in N/A 0.004 in0.10 mm N/A 0.028 in0.71 mm N/A -243 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-244 U-70 N/A
191211 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 107.54 mm4.234 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -244 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-244 U-90 N/A
191212 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 107.54 mm4.234 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -244 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-245 U-70 N/A
191213 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 110.72 mm4.359 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -245 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-245 U-90 N/A
191214 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 110.72 mm4.359 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -245 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-246 U-70 N/A
191215 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 113.89 mm4.484 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -246 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-246 U-90 N/A
191216 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 113.89 mm4.484 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -246 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-247 U-70 N/A
191217 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 117.07 mm4.609 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -247 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.v
-247 U-90 N/A
191218 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 117.07 mm4.609 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -247 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-248 U-70 N/A
191219 		N/A N/A N/A 0.139 in3.53 mm N/A 70 N/A 120.24 mm4.734 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -248 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
-248 U-90 N/A
191220 		N/A N/A N/A 0.139 in3.53 mm N/A 90 N/A 120.24 mm4.734 in N/A 0.004 in0.10 mm N/A 0.030 in0.76 mm N/A -248 N/A N/A N/A N/A N/A O-rings are used in the military defense and agriculture industries.
Unit of Measure
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