Quick reference for screw thread standards worldwide
| Standard | Angle | Seal Method | Common Use |
|---|---|---|---|
| Metric (M) | 60 deg | Compression | General mechanical |
| UNC/UNF | 60 deg | Compression | US/NA mechanical |
| BSP (G) | 55 deg | Compression (P) | EU hydraulic |
| NPT | 60 deg | Taper interference | US pipe |
M10x1.5 = 10mm dia, 1.5mm pitch (coarse). M10x1.25 = fine pitch. Bolt grade markings: 8.8 (640 MPa yield), 10.9 (900 MPa), 12.9 (1080 MPa).