SealSpec / O-rings / Size chart / AS568-109

AS568-109 O-ring · 5/16 ID × 3/32 cross-section

Standard AS568 size -109: 0.299 in inside diameter × 0.103 in cross-section (7.59 × 2.62 mm). Dimensions, tolerances, groove check and material options for specifying this size in a production design.

AS568-109 O-ring dimensioned drawing, 0.299 inch ID by 0.103 inch cross-section, outside diameter 0.505 inch — Dimensioned drawing, proportional to ID/CSDownload SVG

Dimensions (inch)

Dash number	AS568-109
Inside diameter	0.299 ± 0.005
Cross-section	0.103 ± 0.003
Outside diameter (calculated)	0.505
Nominal	5/16 × 1/2 × 3/32

Dimensions (mm)

Inside diameter	7.59 ± 0.13
Cross-section	2.62 ± 0.08
Outside diameter (calc.)	12.83

Material options for -109

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

Check your groove for -109

Enter your gland dimensions. Results are nominal geometry.

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

Open the full groove calculator →

Same cross-section (0.103 in)

-105 0.143 -106 0.174 -107 0.206 -108 0.237 -109 0.299 -110 0.362 -111 0.424 -112 0.487 -113 0.549

← AS568-108 · AS568-110 → · Full size chart