SealSpec / O-rings / Size chart / AS568-231

AS568-231 O-ring · 2 5/8 ID × 1/8 cross-section

Standard AS568 size -231: 2.609 in inside diameter × 0.139 in cross-section (66.27 × 3.53 mm). Dimensions, tolerances, groove check and material options for specifying this size in a production design.

AS568-231 O-ring dimensioned drawing, 2.609 inch ID by 0.139 inch cross-section, outside diameter 2.887 inch — Dimensioned drawing, proportional to ID/CSDownload SVG

Dimensions (inch)

Dash number	AS568-231
Inside diameter	2.609 ± 0.020
Cross-section	0.139 ± 0.004
Outside diameter (calculated)	2.887
Nominal	2 5/8 × 2 7/8 × 1/8

Dimensions (mm)

Inside diameter	66.27 ± 0.51
Cross-section	3.53 ± 0.10
Outside diameter (calc.)	73.33

Material options for -231

Viton / FKM Nitrile / Buna-N EPDM Silicone Fluorosilicone Neoprene

Check your groove for -231

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Groove depth (in)Groove width (in)Installed ID / rod (in)

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Same cross-section (0.139 in)

-227 2.109 -228 2.234 -229 2.359 -230 2.484 -231 2.609 -232 2.734 -233 2.859 -234 2.984 -235 3.109

← AS568-230 · AS568-232 → · Full size chart