SealSpec / O-rings / Size chart / AS568-240

AS568-240 O-ring · 3 3/4 ID × 1/8 cross-section

Standard AS568 size -240: 3.734 in inside diameter × 0.139 in cross-section (94.84 × 3.53 mm). Dimensions, tolerances, groove check and material options for specifying this size in a production design.

AS568-240 O-ring dimensioned drawing, 3.734 inch ID by 0.139 inch cross-section, outside diameter 4.012 inch — Dimensioned drawing, proportional to ID/CSDownload SVG

Dimensions (inch)

Dash number	AS568-240
Inside diameter	3.734 ± 0.028
Cross-section	0.139 ± 0.004
Outside diameter (calculated)	4.012
Nominal	3 3/4 × 4 × 1/8

Dimensions (mm)

Inside diameter	94.84 ± 0.71
Cross-section	3.53 ± 0.10
Outside diameter (calc.)	101.90

Material options for -240

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

Check your groove for -240

Enter your gland dimensions. Results are nominal geometry.

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

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Same cross-section (0.139 in)

-236 3.234 -237 3.359 -238 3.484 -239 3.609 -240 3.734 -241 3.859 -242 3.984 -243 4.109 -244 4.234

← AS568-239 · AS568-241 → · Full size chart