SealSpec / O-rings / Size chart / AS568-318

AS568-318 O-ring · 1 ID × 3/16 cross-section

Standard AS568 size -318: 0.975 in inside diameter × 0.210 in cross-section (24.77 × 5.33 mm). Dimensions, tolerances, groove check and material options for specifying this size in a production design.

AS568-318 O-ring dimensioned drawing, 0.975 inch ID by 0.210 inch cross-section, outside diameter 1.395 inch — Dimensioned drawing, proportional to ID/CSDownload SVG

Dimensions (inch)

Dash number	AS568-318
Inside diameter	0.975 ± 0.010
Cross-section	0.210 ± 0.005
Outside diameter (calculated)	1.395
Nominal	1 × 1 3/8 × 3/16

Dimensions (mm)

Inside diameter	24.77 ± 0.25
Cross-section	5.33 ± 0.13
Outside diameter (calc.)	35.43

Material options for -318

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

Check your groove for -318

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 (0.210 in)

-314 0.725 -315 0.787 -316 0.850 -317 0.912 -318 0.975 -319 1.037 -320 1.100 -321 1.162 -322 1.225

← AS568-317 · AS568-319 → · Full size chart