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.

What squeeze window applies to the Dovetail O-Ring Groove Calculator?

The Dovetail O-Ring Groove Calculator targets 15–25% squeeze for static service. This design lands at 23.5%, which is inside the window.

How deep should the groove be for the Dovetail O-Ring Groove Calculator?

The Dovetail O-Ring Groove Calculator uses the reference AS568-010 at a 0.053 in groove depth for static service. Static glands run shallower than dynamic glands because they tolerate more squeeze.

What gland fill does the Dovetail O-Ring Groove Calculator produce?

Keep gland fill below the 85% thermal-lock threshold. The Dovetail O-Ring Groove Calculator fills 80.0%, leaving 5.0% of the groove free for thermal expansion.

Dovetail O-Ring Groove Calculator

Size a dovetail O-ring groove that retains the seal during assembly and vertical service.

Dovetail O-Ring Groove Calculator overview

The Dovetail O-Ring Groove Calculator uses the AS568-010 reference seal at a 0.053 in groove depth. It seats at 23.5% squeeze against the 15–25% static window and fills 80.0% of the groove cross-section, so the seal has room to expand without thermally locking.

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.

Worked example

Size the Dovetail O-Ring Groove Calculator for the AS568-010 reference seal at a 0.053 in groove depth.

Worked example steps for this calculation
Step	Formula	Value
Groove depth	h = static gland depth	0.053 in
Squeeze	S = (CS' − h) / CS' × 100	23.5 %
Squeeze window	15–25% static	15–25%
Gland fill	F = A_oring / A_groove × 100	80.0 %

The Dovetail O-Ring Groove Calculator seats the AS568-010 at 23.5% squeeze, inside the 15–25% window, with 80.0% gland fill.

Export this calculation

OAS-5879

Copy the engineering spec, export it as CSV, or print a shop ticket. Every export carries this route's parameter outputs, a timestamp and its OAS-5879 verification hash.

Engineering summary

Governing parameters and computed results for Dovetail O-Ring Groove Calculator.

Governing parameters and computed results for this calculation
Parameter	Value
Mode	static
Squeeze	23.5 %
Gland Fill	80.0 %
Extrusion Gap	0.0040 in
Allowable Extrusion Gap	0.0110 in
Extrusion Check	Pass
Stretched O-Ring ID	0.244 in

Frequently asked questions

What squeeze window applies to the Dovetail O-Ring Groove Calculator?: The Dovetail O-Ring Groove Calculator targets 15–25% squeeze for static service. This design lands at 23.5%, which is inside the window.
How deep should the groove be for the Dovetail O-Ring Groove Calculator?: The Dovetail O-Ring Groove Calculator uses the reference AS568-010 at a 0.053 in groove depth for static service. Static glands run shallower than dynamic glands because they tolerate more squeeze.
What gland fill does the Dovetail O-Ring Groove Calculator produce?: Keep gland fill below the 85% thermal-lock threshold. The Dovetail O-Ring Groove Calculator fills 80.0%, leaving 5.0% of the groove free for thermal expansion.

O-Ring Gland & Squeeze Sizer

Deterministic SAE AS568 gland, squeeze, fill and extrusion-gap calculations for static and dynamic seals.

Result

AS568-010 at 23.5% squeeze and 80.0% gland fill in a static gland.

23.5% squeeze

Seal Configuration

Seal Mode

AS568 Dash Size

Gland Geometry

Gland Bore (D)

Groove Depth (h)

Groove Width (w)

Stretch

Diametral Clearance (G)

Metal-to-metal gap across the seal.

System Pressure (P)

psi

Hardness