SealSpec / O-rings / Size chart / AS568-387

AS568-387 O-ring · 18 ID × 3/16 cross-section

Standard AS568 size -387: 17.955 in inside diameter × 0.210 in cross-section (456.06 × 5.33 mm). Dimensions, tolerances, groove check and material options for specifying this size in a production design.

AS568-387 O-ring dimensioned drawing, 17.955 inch ID by 0.210 inch cross-section, outside diameter 18.375 inch — Dimensioned drawing, proportional to ID/CSDownload SVG

Dimensions (inch)

Dash number	AS568-387
Inside diameter	17.955 ± 0.085
Cross-section	0.210 ± 0.005
Outside diameter (calculated)	18.375
Nominal	18 × 18 3/8 × 3/16

Dimensions (mm)

Inside diameter	456.06 ± 2.16
Cross-section	5.33 ± 0.13
Outside diameter (calc.)	466.72

Material options for -387

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

Check your groove for -387

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

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Same cross-section (0.210 in)

-383 13.975 -384 14.975 -385 15.955 -386 16.955 -387 17.955 -388 18.955 -389 19.955 -390 20.955 -391 21.955

← AS568-386 · AS568-388 → · Full size chart