Static Groove Spec Table
This specification follows JIS (Japanese Industrial Standards). JIS is highly compatible with Korean KS standards and is essential when sourcing or maintaining Japanese-manufactured parts and equipment.
O-ring groove dimensions for static seal applications such as flanges and covers.
Practical Notes
- Apply 15–30% compression — higher than dynamic type. Surface roughness Ra 0.8–1.6μm — less stringent than dynamic grooves.
- Bolt holes near O-ring grooves can deform sealing surfaces. Maintain minimum distance between groove and bolt holes.
Selection Guide
Groove dimensions for static sealing at flanges and covers. Higher compression (15–30%) than dynamic type for seal reliability. Surface roughness Ra 0.8–1.6μm — less stringent machining than dynamic type.
JISStatic Groove
5 sizes| Wire/Use | Groove D | Groove W | Squeeze | Note | - |
|---|---|---|---|---|---|
| CS1.9Static | 1.4 | 2.6 | 26% | Flange/Bore | - |
| CS2.4Static | 1.8 | 3.2 | 25% | Flange/Bore | - |
| CS3.1Static | 2.35 | 4.1 | 24% | Flange/Bore | - |
| CS3.5Static | 2.65 | 4.6 | 24% | Flange/Bore | - |
| CS5.7Static | 4.3 | 7.5 | 25% | Flange/Bore | - |
Key Features
- Static sealing only; O-ring remains stationary at flange/cover joint faces
- Compression ratio 15–30%, higher than dynamic type, prioritizing seal reliability
- Surface roughness Ra 0.8–1.6 μm acceptable; less stringent machining than dynamic type
Key Applications
Hydraulic manifold covers, pump housing joint faces, pipe flange seals, valve bonnets, pressure vessel manholes
FAQ
Difference between static and dynamic O-ring grooves?
Static: higher compression (15–30%), relaxed roughness (Ra 0.8–1.6μm). Dynamic: lower compression (8–16%) to minimize friction, smoother surfaces required.