SAE J1926 Boss ORB O-Ring Chart

Look up the SAE J1926 O-ring boss (ORB) dash size and gland dimensions for a port size.

SAE J1926 Boss ORB O-Ring Chart overview

SAE J1926 Boss ORB O-Ring Chart overview is computed deterministically from the parameters encoded in this page's address, so the same inputs always produce the same result and the same OAS-XXXX verification hash.

Governing gland dimensions

Governing gland dimensions is computed deterministically from the parameters encoded in this page's address, so the same inputs always produce the same result and the same OAS-XXXX verification hash.

Squeeze, fill and extrusion checks

Squeeze, fill and extrusion checks is computed deterministically from the parameters encoded in this page's address, so the same inputs always produce the same result and the same OAS-XXXX verification hash.

Engineering summary

Governing parameters and computed results for SAE J1926 Boss ORB O-Ring Chart.

Governing parameters and computed results for this calculation
Parameter Value
Dash 908

Frequently asked questions

What squeeze percentage should a static AS568 gland use?
Static face and radial seals target 15% to 25% squeeze. Below 15% the seal may not seat against surface finish and pressure; above 25% compression set accelerates and the elastomer takes a permanent set.
How is the AS568 dash number related to cross-section?
The dash series fixes the cross-section: 0xx is 0.070 in, 1xx is 0.093 to 0.103 in, 2xx is 0.139 in, 3xx is 0.210 in and 4xx is 0.275 in. The 9xx series are SAE Boss ORB sizes at 0.087 in.
When does an O-ring gland need a backup ring?
Add a backup ring when the extrusion gap exceeds the elastomer's allowable gap at the operating pressure and temperature. The backup ring groove width grows with each ring: the 0-ring, 1-ring and 2-ring widths are tabulated per dash size.