O-Ring Groove Calculator (Gland Design)
Groove depth and width from O-ring cross-section, squeeze percentage and target gland fill — Parker-handbook gland design in one shot.
Squeeze seals; fill kills. The cross-section must be compressed enough to follow both surfaces, but the rubber is incompressible — its volume just moves — so the groove must stay roughly a quarter empty to absorb thermal expansion and fluid swell. A gland that is perfect at 20 °C and 100 %-full at 120 °C will extrude the seal into the clearance gap and shred it. EPDM in glycol and NBR in fuel can swell 10–20 % by volume on their own.
Formula
Note: Static radial gland, simplified. Dynamic seals, vacuum service, high pressure (back-up rings) and low-temperature elastomers each shift the numbers — verify in the Parker ORD 5700 design tables before cutting metal.
Groove depth and width from O-ring cross-section, squeeze percentage and target gland fill — Parker-handbook gland design in one shot. A free machinist & fabrication essentials tool — no sign-up, no upload, instant results in your browser.
About O-Ring Groove Calculator (Gland Design)
O-Ring Groove Calculator (Gland Design) computes the governing relationship depth = W·(1 − squeeze) ; width = (π/4·W²) / (depth · fill) live as you type. Squeeze seals; fill kills. The cross-section must be compressed enough to follow both surfaces, but the rubber is incompressible — its volume just moves — so the groove must stay roughly a quarter empty to absorb thermal expansion and fluid swell. A gland that is perfect at 20 °C and 100 %-full at 120 °C will extrude the seal into the clearance gap and shred it. EPDM in glycol and NBR in fuel can swell 10–20 % by volume on their own. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use O-Ring Groove Calculator (Gland Design)
- 1Enter your values — O-ring cross-section (W), Design squeeze, Target gland fill (sensible defaults are pre-filled).
- 2Read the live results: Groove depth, Groove width, Actual squeeze.
- 3Check the "with your numbers" line to see depth = W·(1 − squeeze) ; width = (π/4·W²) / (depth · fill) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use O-Ring Groove Calculator (Gland Design)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula depth = W·(1 − squeeze) ; width = (π/4·W²) / (depth · fill) with authoritative sources cited on the page (Parker O-Ring Handbook ORD 5700; Machinery's Handbook, 31st ed.)
- ✓Squeeze seals; fill kills.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the o-ring groove calculator (gland design) use?+
It evaluates depth = W·(1 − squeeze) ; width = (π/4·W²) / (depth · fill), exactly as published. Sources: Parker O-Ring Handbook ORD 5700; Machinery's Handbook, 31st ed.. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Squeeze seals; fill kills. Static radial gland, simplified. Dynamic seals, vacuum service, high pressure (back-up rings) and low-temperature elastomers each shift the numbers — verify in the Parker ORD 5700 design tables before cutting metal.
When is this calculator the right tool for the job?+
Groove depth and width from O-ring cross-section, squeeze percentage and target gland fill. The cross-section must be compressed enough to follow both surfaces, but the rubber is incompressible — its volume just moves — so the groove must stay roughly a quarter empty to absorb thermal expansion and fluid swell. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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