DIN6921– M5x16– 8.8 Dacromet middle carbon steel 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 and property classes 8.8, 9.8, 10.9 and A2-70,A4-70.
Flange head screws includes two kinds of serrated and smooth plane.
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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 |