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G-Series Spec Table
G-Series Specifications — 18 sizes
JIS B 2401JIS B 2401-1
JIS G-series O-rings, mainly used for static seals on flanges and covers.
Practical Notes
- Not interchangeable with P-series. Always specify G-series when ordering. Mix-ups lead to seal failure.
- As a static seal, apply 15–30% compression for reliable sealing.
Selection Guide
JIS standard O-rings for static sealing at flanges, covers, and pipe fittings. Not interchangeable with P-series. Optimized for pipe thread (PF/PT) port sealing.
JISG-Series
6 sizesThe dimensions below are identical across JIS B 2401 · JIS B 2401-1.
| Nominal | ID | CS | Use | Standard | - |
|---|---|---|---|---|---|
| G25 | 24.4 | 3.1 | Fixing | JIS B 2401 | - |
| G30 | 29.4 | 3.1 | Fixing | JIS B 2401 | - |
| G35 | 34.4 | 3.1 | Fixing | JIS B 2401 | - |
| G40 | 39.4 | 3.1 | Fixing | JIS B 2401 | - |
| G45 | 44.4 | 3.1 | Fixing | JIS B 2401 | - |
| G50 | 49.4 | 3.1 | Fixing | JIS B 2401 | - |
Key Features
- JIS B 2401 G-series numbering; designed for static sealing with cylindrical surface fit
- Cord diameters (W): 1.78/2.62/3.53/5.34/7.0 mm in 5 types; not interchangeable with P-series
- Inner diameter optimized for sealing pipe thread (PF/PT) ports
Key Applications
Hydraulic manifold ports, pipe fitting seals, instrument port sealing, valve body joint faces, pump cover seals
FAQ
Difference between G-series and P-series?
G-series is for static seals (fixed parts); P-series for dynamic seals (moving parts). Sizes are not interchangeable — do not mix.