Shanghai Summery Industrial Machine Co. , Ltd.
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Hexagon head screws — Product grades A
ISO4017 DIN933 bolts
This International Standard specifies the characteristics of hexagon head screws with threads from M1,6
up to and including M64, of product grade A for threads M1,6 to M24 and nominal lengths up to and
including 10 d or 150 mm,whichever is shorter, and product grade B for threads over M24 or nominal
lengths over 10 d or 150 mm, whichever is shorter.
NOTE: This type of product is the same as that covered by ISO 4014 DIN931 with the exception of threading up to head and nominal length up to and including 200 mm as popular lengths.
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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 | |