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O-rings, common metric sizes (ISO 3601)
How do I size an O-ring groove for a 3D-printed lid? · Hardware · basis: ISO 3601; groove rules of thumb for static face seals
- sizes
- 7 in table
Notes
- Cross-sections (CS) are standardized: 1.0, 1.5, 1.78, 2.0, 2.4, 2.62, 3.0, 3.53 mm. Inside diameter is nearly continuous.
- Static face-seal groove: depth = 0.75 × CS, width = 1.35 × CS, so the ring is squeezed ~25% and has room to spread. Printed grooves: smooth the floor (ironing or sand) or it won't seal.
Sizes
| cross_section_mm | groove_depth_mm | groove_width_mm |
|---|---|---|
| 1.5 | 1.1 | 2.0 |
| 1.78 | 1.35 | 2.4 |
| 2.0 | 1.5 | 2.7 |
| 2.4 | 1.8 | 3.2 |
| 2.62 | 2.0 | 3.5 |
| 3.0 | 2.25 | 4.0 |
| 3.53 | 2.65 | 4.8 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| McMaster-Carr | O-rings (free STEP/IGES/STL per part, for your own design use; no redistribution) | STEP, IGES, STL, PDF | McMaster-Carr site terms: personal design use, no redistribution verify |
| Wikipedia | O-ring | web | CC BY-SA 4.0 (text) |
Xem scan
Not needed Published standard; the sheet is the geometry.
Plain text: sheet.txt · JSON: /api/geometry?object=o-rings-metric
Questions
What groove size for a 2 mm cross-section O-ring?
Static face seal: 1.5 mm deep, 2.7 mm wide (0.75 × CS deep, 1.35 × CS wide, 25% squeeze). Iron or sand the groove floor on a print.
What are the standard O-ring cross-sections?
1.0, 1.5, 1.78, 2.0, 2.4, 2.62, 3.0 and 3.53 mm (ISO 3601). Inside diameters are nearly continuous, so pick the CS first then the ID.