Product：hexagon head screws / half thread
Specification：M20-M72
Property Class: ISO898-1 8.8, 10.9
Elongation after fracture
Minimum tensile strength
Lower yield strength or stress ar 0.2% non-proportional elongation
Stress under proof load
Strength under wedge loading
Hardness
Impact strength Kv， min at -20℃
Above property requirements comform to ISO898-1
Thread tolerance：6g,6e,6h
Tolerance standard：ISO 4759-1
Surface defect：ISO 6157-1
Quality management systems: ISO9001
| THREAD DIMENSION | M20 | (M22) | M24 | (M27) | M30 | (M33) | M36 | (M39) | M42 | |||
| d | ||||||||||||
| P | PITCH | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | 4.5 | ||
| b | L≤125 | 46 | 50 | 54 | 60 | 66 | - | - | - | - | ||
| 125＜L≤200 | 52 | 56 | 60 | 66 | 72 | 78 | 84 | 90 | 96 | |||
| L＞200 | 65 | 69 | 73 | 79 | 85 | 91 | 97 | 103 | 109 | |||
| c | MAX | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 1 | 1 | ||
| MIN | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | |||
| da | MAX | 22.4 | 24.4 | 26.4 | 30.4 | 33.4 | 36.4 | 39.4 | 42.4 | 45.6 | ||
| ds | MAX=NOMINAL | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 39 | 42 | ||
| LEVEL A | MIN | 19.67 | 21.67 | 23.67 | - | - | - | - | - | - | ||
| LEVEL B | MIN | 19.48 | 21.48 | 23.48 | 26.48 | 29.48 | 32.38 | 35.38 | 38.38 | 41.38 | ||
| dw | LEVEL A | MIN | 28.19 | 31.71 | 33.61 | - | - | - | - | - | - | |
| LEVEL B | MIN | 27.7 | 31.35 | 33.25 | 38 | 42.75 | 46.55 | 51.11 | 55.86 | 59.95 | ||
| e | LEVEL A | MIN | 33.53 | 37.72 | 39.98 | - | - | - | - | - | - | |
| LEVEL B | MIN | 32.95 | 37.29 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | ||
| L1 | MAX | 4 | 4 | 4 | 6 | 6 | 6 | 6 | 6 | 8 | ||
| k | NOMINAL | 12.5 | 14 | 15 | 17 | 18.7 | 21 | 22.5 | 25 | 26 | ||
| LEVEL A | MAX | 12.715 | 14.215 | 15.215 | - | - | - | - | - | - | ||
| MIN | 12.285 | 13.785 | 14.785 | - | - | - | - | - | - | |||
| LEVEL B | MAX | 12.85 | 14.35 | 15.35 | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | 26.42 | ||
| MIN | 12.15 | 13.65 | 14.65 | 16.65 ① | 18.28 | 20.58 | 22.08 | 24.58 | 25.58 | |||
| k1 | LEVEL A | MIN | 8.6 | 9.65 | 10.35 | - | - | - | - | - | - | |
| LEVEL B | MIN | 8.51 | 9.56 | 10.26 | 11.66 | 12.8 | 14.41 | 15.46 | 17.21 | 17.91 | ||
| r | MIN | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | 1.2 | ||
| s | MAX=NOMINAL | 30 | 34 | 36 | 41 | 46 | 50 | 55 | 60 | 65 | ||
| LEVEL A | MIN | 29.67 | 33.38 | 35.38 | - | - | - | - | - | - | ||
| lEVEL B | MIN | 29.16 | 33 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | 63.1 | ||
| THREAD LENGTH b | - | - | - | - | - | - | - | - | - | |||
| THREAD DIMENSION | (M45) | M48 | (M52) | M56 | (M60) | M64 | |||
| d | |||||||||
| P | PITCH | 4.5 | 5 | 5 | 5.5 | 5.5 | 6 | ||
| b | L≤125 | - | - | - | - | - | - | ||
| 125＜L≤200 | 102 | 108 | 116 | - | - | - | |||
| L＞200 | 115 | 121 | 129 | 137 | 145 | 153 | |||
| c | MAX | 1 | 1 | 1 | 1 | 1 | 1 | ||
| MIN | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | |||
| da | MAX | 48.6 | 52.6 | 56.6 | 63 | 67 | 71 | ||
| ds | MAX=NOMINAL | 45 | 48 | 52 | 56 | 60 | 64 | ||
| LEVEL A | MIN | - | - | - | - | - | - | ||
| LEVEL B | MIN | 44.38 | 47.38 | 51.26 | 55.26 | 59.26 | 63.26 | ||
| dw | LEVEL A | MIN | - | - | - | - | - | - | |
| LEVEL B | MIN | 64.7 | 69.45 | 74.2 | 78.66 | 83.41 | 88.16 | ||
| e | LEVEL A | MIN | - | - | - | - | - | - | |
| LEVEL B | MIN | 76.95 | 82.6 | 88.25 | 93.56 | 99.21 | 104.86 | ||
| L1 | MAX | 8 | 10 | 10 | 12 | 12 | 13 | ||
| k | NOMINAL | 28 | 30 | 33 | 35 | 38 | 40 | ||
| LEVEL A | MAX | - | - | - | - | - | - | ||
| MIN | - | - | - | - | - | - | |||
| LEVEL B | MAX | 28.42 | 30.42 | 33.5 | 35.5 | 38.5 | 40.5 | ||
| MIN | 27.58 | 29.58 | 32.5 | 34.5 | 37.5 | 39.5 | |||
| k1 | LEVEL A | MIN | - | - | - | - | - | - | |
| LEVEL B | MIN | 19.31 | 20.71 | 22.75 | 24.15 | 26.25 | 27.65 | ||
| r | MIN | 1.2 | 1.6 | 1.6 | 2 | 2 | 2 | ||
| s | MAX=NOMINAL | 70 | 75 | 80 | 85 | 90 | 95 | ||
| LEVEL A | MIN | - | - | - | - | - | - | ||
| lEVEL B | MIN | 68.1 | 73.1 | 78.1 | 82.8 | 87.8 | 92.8 | ||
| THREAD LENGTH b | - | - | - | - | - | - | |||
