DIN 931 is a German standard that specifies the technical delivery conditions for hexagon head bolts with thread sizes ranging from M6 to M39 and property classes 8.8, 10.9, and 12.9. These bolts are intended for use in general mechanical engineering and are characterized by their hexagonal head and partial threading.
The standard specifies the dimensions, tolerances, and other requirements for these bolts, including the head's shape and size, the thread's diameter and pitch, and the thread's length. It also specifies the materials that can be used for the bolts, including carbon steel, alloy steel, and stainless steel.
DIN 931 bolts are frequently utilized in a wide variety of applications, including automotive industry, construction industry, and machinery industry. They are often used to fasten metal parts together, such as connecting flanges or attaching components to structural members. They are also frequently used in the production as well as the repair of a wide variety of equipment, including automobiles, machinery, and other types of equipment.
| D | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| P | 0,5 | 0,7 | 0,8 | 1 | 1,25 | 1,5 | 1,75 | 2 | 2 | 2,5 | |
| K | 2 | 2,8 | 3,5 | 4 | 5,3 | 6,4 | 7,5 | 8,8 | 10 | 11,5 | |
| C | min. | 0,15 | 0,15 | 0,15 | 0,15 | 0,15 | 0,15 | 0,15 | 0,15 | 0,2 | 0,2 |
| max. | 0,4 | 0,4 | 0,5 | 0,5 | 0,6 | 0,6 | 0,6 | 0,6 | 0,8 | 0,8 | |
| R | 0,1 | 0,2 | 0,2 | 0,25 | 0,4 | 0,4 | 0,6 | 0,6 | 0,6 | 0,6 | |
| S | DIN 931 | 5,5 | 7 | 8 | 10 | 13 | 17 | 19 | 22 | 24 | 27 |
| ISO 4014 | 16 | 18 | 21 | ||||||||
| e | DIN 931 | 6,01 | 7,66 | 8,79 | 11,05 | 14,38 | 18,9 | 21,1 | 24,49 | 26,75 | 30,14 |
| ISO 4014 | 17,77 | 20,03 | 23,36 | ||||||||
| B (L≤125) | 12 | 14 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 42 | |
| B (125<L≤200) | 18 | 20 | 22 | 24 | 28 | 32 | 36 | 40 | 44 | 48 | |
| B (L>200) | - | - | - | - | - | 45 | 49 | 53 | 57 | 61 | |
| D | M20 | M22 | M24 | M27 | M30 | M36 | M42 | M48 | M56 | M64 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| P | 2,5 | 2,5 | 3 | 3 | 3,5 | 4 | 4,5 | 5 | 5,5 | 6 | |
| K | 12.5 | 14 | 15 | 17 | 18.7 | 22.5 | 26 | 30 | 35 | 40 | |
| C | min. | 0,2 | 0,2 | 0,2 | 0,2 | 0,2 | 0,2 | 0,3 | 0,3 | 0,3 | 0,3 |
| max. | 0,8 | 0,8 | 0,8 | 0,8 | 0,8 | 0,8 | 1 | 1 | 1 | 1 | |
| R | 0,8 | 0,8 | 0,8 | 1 | 1 | 1 | 1,2 | 1,6 | 2 | 2 | |
| S | DIN 931 | 30 | 32 | 36 | 41 | 46 | 55 | 65 | 75 | 85 | 95 |
| ISO 4014 | 34 | ||||||||||
| e | DIN 931 | 33,53 | 38,85 | 39,98 | 45,2 | 50,85 | 60,79 | 71,3 | 82,6 | 93,56 | 104,9 |
| ISO 4014 | 37,72 | ||||||||||
| B (L≤125) | 46 | 50 | 54 | 60 | 66 | - | - | - | - | - | |
| B (125<L≤200) | 52 | 56 | 60 | 66 | 72 | 84 | 96 | 108 | - | - | |
| B (L>200) | 65 | 69 | 73 | 79 | 85 | 97 | 109 | 121 | 137 | 153 | |
