ISO 10642 M12 × 100 Countersunk head (90°)
ISO 10642 M12 × 100 is a socket countersunk head screw with a 100 mm nominal length, on a M12 × 1.5 mm metric thread. ISO equivalent of DIN 7991. Both use the same 90° countersink angle, so mating holes are interchangeable.
Dimensions
- Standard
- ISO 10642
- Type
- Socket countersunk head screw
- Size
- M12 × 100
- Thread
- M12 × 1.5
- Length L
- 100 mm
- Socket size s
- 8 mm
- Head diameter dk
- 24 mm
- Head height k
- 7.44 mm
- Thread length b
- 36 mm
- Drive
- Hexagon socket
- Head
- Countersunk head (90°)
Nominal values in millimetres as published in ISO 10642. Estimated weight 104.194 g per piece in steel (104.858 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M12 thread pageOther lengthsISO 10642 M12
All M12 specificationsInterchangeability
ISO 10642 is catalogued with DIN 7991 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.
Choosing and fitting this size
ISO 10642 M12 × 100 is a countersunk head (90°) in M12, 100 mm long under the head, on a 1.5 mm coarse pitch. Mating threads should be a matching class nut or a tapped hole of the same nominal size.
Common stock grades are 8.8, 10.9 and 12.9 in steel, plus A2-70 and A4-80 in stainless. Class 10.9 and 12.9 carry roughly 1.25 and 1.5 times the proof load of 8.8, but they also need a properly rated mating nut — a class 8 nut under a 12.9 bolt simply moves the failure into the thread. Zinc-plated 10.9 and above should be baked to avoid hydrogen embrittlement.
For a tapped hole, M12 × 1.5 mm takes a 10.5 mm tap drill, and the external thread's minor diameter is 10.16 mm — that is the section carrying the load, not the nominal M12 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.