DIN 913 M3 × 12 Headless
DIN 913 M3 × 12 is a socket set screw, flat point with a 12 mm nominal length, on a M3 × 0.5 mm metric thread. A flat ended grub screw used where the shaft must not be marked, or for adjustment applications such as levelling screws.
Dimensions
- Standard
- DIN 913
- Type
- Socket set screw, flat point
- Size
- M3 × 12
- Thread
- M3 × 0.5
- Length L
- 12 mm
- Socket size s
- 1.5 mm
- Drive
- Hexagon socket
- Head
- Headless
Nominal values in millimetres as published in DIN 913. Estimated weight 0.666 g per piece in steel (0.67 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M3 thread pageOther lengthsDIN 913 M3
All M3 specificationsInterchangeability
DIN 913 is catalogued with ISO 4026 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.
Choosing and fitting this size
DIN 913 M3 × 12 is a headless in M3, 12 mm long under the head, on a 0.5 mm coarse pitch. Mating threads should be a matching class nut or a tapped hole of the same nominal size.
Set screws are rated by surface hardness rather than tensile class — the common stock grade is 45H, which is hard enough to bite into a hardened shaft. Stainless set screws are not through-hardened and will not bite the same way, so they are a poor substitute where the point has to grip.
For a tapped hole, M3 × 0.5 mm takes a 2.5 mm tap drill, and the external thread's minor diameter is 2.39 mm — that is the section carrying the load, not the nominal M3 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.