SXF
| Standard: GB/T 6170-2000 |
| Material: 35K，45K |
| Levels: 8, 10 |
| Surface: Blackened |
| Packing: Carton packing |
| GB/T 6170-GB/T 6171 Table 1 | ||||||||
| mm | ||||||||
| Thread specification D | M16 | (M18) | 20 | -22 | 24 | -27 | 30 | |
| P (pitch) | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | |
| P (fine tooth pitch) | 1.5 | - | 1.5 | - | 2 | - | 2 | |
| - | 1.5 | 2 | 1.5 | - | 2 | - | ||
| da (counterbore diameter) | max | 17.3 | 19.5 | 21.6 | 23.7 | 25.9 | 29.1 | 32.4 |
| min | 16 | 18 | 20 | 22 | 24 | 27 | 30 | |
| dw (bearing surface diameter) | min | 22.5 | 24.9 | 27.7 | 31.4 | 33.3 | 38 | 42.8 |
| e (diagonal width) | min | 26.75 | 29.56 | 32.95 | 37.29 | 39.55 | 45.2 | 50.85 |
| m (nut height) | max | 14.8 | 15.8 | 18 | 19.4 | 21.5 | 23.8 | 25.6 |
| min | 14.1 | 15.1 | 16.9 | 18.1 | 20.2 | 22.5 | 24.3 | |
| mw (wrench height) | min | 11.3 | 12.1 | 13.5 | 14.5 | 16.2 | 18 | 19.4 |
| c (bottom ring thickness) | max | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| min | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
| s (counter-width) | max | 24 | 27 | 30 | 34 | 36 | 41 | 46 |
| min | 23.67 | 26.16 | 29.16 | 33 | 35 | 40 | 45 | |
