SealSpec / O-rings / Size chart / AS568-427

AS568-427 O-ring · 4 3/4 ID × 1/4 cross-section

Standard AS568 size -427: 4.725 in inside diameter × 0.275 in cross-section (120.02 × 6.99 mm). Dimensions, tolerances, groove check and material options for specifying this size in a production design.

AS568-427 O-ring dimensioned drawing, 4.725 inch ID by 0.275 inch cross-section, outside diameter 5.275 inch — Dimensioned drawing, proportional to ID/CSDownload SVG

Dimensions (inch)

Dash number	AS568-427
Inside diameter	4.725 ± 0.033
Cross-section	0.275 ± 0.006
Outside diameter (calculated)	5.275
Nominal	4 3/4 × 5 1/4 × 1/4

Dimensions (mm)

Inside diameter	120.02 ± 0.84
Cross-section	6.99 ± 0.15
Outside diameter (calc.)	133.98

Material options for -427

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

Check your groove for -427

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 (0.275 in)

-425 4.475 -426 4.600 -427 4.725 -428 4.850 -429 4.975 -430 5.100 -431 5.225

← AS568-426 · AS568-428 → · Full size chart