Shanghai Summery Industrial Machine Co. , Ltd.
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Alloy steel DIN6921– M16x40– 10.9 Dacromet Flange Head Screws
This International Standard specifies the characteristics of flange hexagon bolts ,with product grade A, with threads from M5 up to and including M16,length from 10mm to 200mm,and property classes 8.8, 9.8, 10.9 and A2-70,A4-70.
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| Minimum breaking torques | |||||
| Thread | Pitch (mm) | Minimum breaking torque (N.m) | |||
| Property class | |||||
| 8.8 | 9.8 | 10.9 | 12.9 | ||
| M2 | 0.40 | 0.37 | 0.4 | 0.45 | 0.5 |
| M2.5 | 0.45 | 0.82 | 0.9 | 1 | 1.1 |
| M3 | 0.50 | 1.5 | 1.7 | 1.9 | 2.1 |
| M3.5 | 0.60 | 2.4 | 2.7 | 3 | 3.3 |
| M4 | 0.70 | 3.6 | 3.9 | 4.4 | 4.9 |
| M5 | 0.80 | 7.6 | 8.3 | 9.3 | 10 |
| M6 | 1.00 | 13 | 14 | 16 | 17 |
| M7 | 1.00 | 23 | 25 | 28 | 31 |
| M8 | 1.25 | 33 | 36 | 40 | 44 |
| M8x1.0 | 1.00 | 38 | 42 | 46 | 52 |
| M10 | 1.50 | 66 | 72 | 81 | 90 |
| M10x1.0 | 1.00 | 84 | 92 | 102 | 114 |
| M10x1.25 | 1.25 | 75 | 82 | 91 | 102 |
| Mechanical and physical peroperties of bolts,screws and studs | |||||
| Mechanical and physical peroperties | Property class | ||||
| 8.8 | 10.9 | 12.9 | |||
| d≦16 mm | d﹥16 mm | ||||
| Minimum tensile strength (N/mm2) | min | 800 | 830 | 1040 | 1220 |
| Vickers hardness (HV) | min | 250 | 255 | 320 | 385 |
| max | 320 | 335 | 380 | 435 | |
| Brinell hardness (HB) | min | 238 | 242 | 304 | 366 |
| max | 304 | 318 | 361 | 414 | |
| Rockwell hardness (HRC) | min | 22 | 23 | 32 | 39 |
| max | 32 | 34 | 39 | 44 | |