DIN 938 studs have a fixing thread on one end and a nut thread on the other. The fixed end (b1) is screwed into the pre-tapped internal threaded hole, and the exposed other end (b2) is used to install the nut. In DIN 938, the dimensioning format is d × l, where d is the nominal diameter and l is the nominal length (excluding the thread length of the fixed end b1).
Example: DIN 938 stud of M11 × 60 means the diameter is 11mm, the nominal length is 60mm, the fixed end b1 has another length specified by the standard, and the total length of the stud = l + b1.
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DIN 938 Specifications
- Carbon Steel: 5.6, 8.8, 10.9.
| mm | P (Coarse Pitch) | P (Fine Pitch) | b1 | ds max |
|---|---|---|---|---|
| M3 | 0.5 | – | 3 | 3 |
| M4 | 0.7 | – | 4 | 4 |
| M5 | 0.8 | – | 5 | 5 |
| M6 | 1 | – | 6 | 6 |
| M7 | 1 | – | 7 | 7 |
| M8 | 1.25 | 1 | 8 | 8 |
| M10 | 1.5 | 1.25 | 10 | 10 |
| M12 | 1.75 | 1.25 | 12 | 12 |
| M14 | 2 | 1.5 | 14 | 14 |
| M16 | 2 | 1.5 | 16 | 16 |
| M18 | 2.5 | 1.5 | 18 | 18 |
| M20 | 2.5 | 1.5 | 20 | 20 |
| M22 | 2.5 | 1.5 | 22 | 22 |
| M24 | 3 | 2 | 24 | 24 |
| M27 | 3 | 2 | 25 | 27 |
| M30 | 3.5 | 2 | 30 | 30 |
| M33 | 3.5 | 2 | 32 | 33 |
| M36 | 4 | 3 | 35 | 36 |
| M39 | 4 | 3 | 38 | 39 |
| M42 | 4.5 | 3 | 42 | 42 |
| M45 | 4.5 | 3 | 45 | 45 |
| M48 | 5 | 3 | 48 | 48 |
| M52 | 5 | 3 | 52 | 52 |