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.
If you are looking for flange head screws, please contact us for further information.
| Material | Steel | Stainless steel |
| General International requirements Standard | ISO 8992 | |
| Thread Tolerance International Standards | 6g | |
| ISO 261, ISO 965-2 | ||
| Mechanical Class properties International Standards | 8.8, 9.8, 10.9 | A2-70,A4-70 |
| ISO 898-1 | ISO 3506-1 | |
| Tolerances Product grade International Standard | A | |
| ISO 4759-1 | ||
| Finish | Black oxide Plain (thermic or chemical) Requirements for electroplating are covered in ISO 4042
If different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between customer and supplier.
Limits for surface discontinuities are covered in ISO 6157-3. | |
| 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 | |