SealSpec / O-rings / Size chart / AS568-156

AS568-156 O-ring · 4 1/4 ID × 3/32 cross-section

Standard AS568 size -156: 4.237 in inside diameter × 0.103 in cross-section (107.62 × 2.62 mm). Dimensions, tolerances, groove check and material options for specifying this size in a production design.

AS568-156 O-ring dimensioned drawing, 4.237 inch ID by 0.103 inch cross-section, outside diameter 4.443 inch — Dimensioned drawing, proportional to ID/CSDownload SVG

Dimensions (inch)

Dash number	AS568-156
Inside diameter	4.237 ± 0.030
Cross-section	0.103 ± 0.003
Outside diameter (calculated)	4.443
Nominal	4 1/4 × 4 7/16 × 3/32

Dimensions (mm)

Inside diameter	107.62 ± 0.76
Cross-section	2.62 ± 0.08
Outside diameter (calc.)	112.85

Material options for -156

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

Check your groove for -156

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

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Same cross-section (0.103 in)

-152 3.237 -153 3.487 -154 3.737 -155 3.987 -156 4.237 -157 4.487 -158 4.737 -159 4.987 -160 5.237

← AS568-155 · AS568-157 → · Full size chart