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Association
& Quality
Find the O-Ring for Your Groove
Measured a groove with calipers? Enter the inside diameter, outside diameter, depth, and width. We’ll show the O-ring size(s) that fit — squeeze, gland fill, and stretch checked against industry design rules — and what to do when it’s not a standard size.
Groove cut around a piston or shaft; the O-ring is squeezed between the groove bottom and the bore wall. Not sure? Piston/shaft is the most common — pick it and adjust.
Piston / shaft groove — the O-ring is squeezed between the groove bottom and the bore wall. Tap a field below and its dimension lights up.
in
Smaller of the two diameters.
in
Larger of the two diameters.
in
Radial depth. Auto = (OD−ID)÷2.
in
Axial width of the groove.
The finder uses published O-ring design rules (Parker O-Ring Handbook ORD 5700; SAE AS568D sizes) — target squeeze, gland-fill, and stretch ranges — against Global O-Ring’s stocked AS568 sizes. Results are a starting point; final selection should account for tolerances, fluid/thermal swell, pressure, and material. Want a person to confirm it? Request a quote or call 832-448-5550 — most of what we sell is in stock in Houston.
Related: Shop all O-Rings · O-Ring Groove Design guide
O-Ring Groove Design Calculator
Pick an AS568 series and a groove type — get gland depth, squeeze, width, gap, and corner radii instantly. All values in inches.
Static radial gland — designed clearance gap, no motion.
in
Nearest stocked AS568 dash in this series — with a machine-to-fit tip if your ID is off-standard.
Design Validator
Real-time checks against the methodology described further down this page — compression-ratio extremes, extrusion-pressure limits, and concentric clearance.
Compression Check
Squeeze at nominal dimensions and at both tolerance extremes. Each value is checked against the published squeeze range for the selected series and groove type.
Extrusion / Pressure Check
Enter your application pressure, durometer, and clearance gap. The calculator returns the max safe pressure for that combination (Parker EB-1010 limits) and whether your design fits.
psi
in
Concentricity / Clearance Helper
No measured clearance handy? Enter bore and shaft/piston diameters. Assume all clearance can shift to one side — the full diametric clearance is what the extrusion check needs.
in
in
Extrusion-pressure limits derived from the Parker O-Ring Handbook (ORD 5700 / EB-1010). Values assume continuous pressure at room temperature on elastomeric compounds (Buna-N, FKM/Viton, EPDM). For FFKM, PTFE, polyurethane, high-temperature service, pulsing pressure, or Rapid Gas Decompression, request engineering review.
Values come from the AS568 design tables published on this page. Use them as a starting point — the final design must account for tolerance extremes, fluid swell, thermal expansion, and concentricity.
Request a quote or call 832-448-5550.
Related: Shop all O-Rings · O-Ring Groove Design guide
