ISO 4014 M8 × 30 Hexagon head
ISO 4014 M8 × 30 is a hexagon head bolt with a 30 mm nominal length, on a M8 × 1 mm metric thread. ISO version of the partial thread hexagon head bolt. The standard thread length is defined by nominal length bands, so long bolts have a proportionally longer plain shank.
Dimensions
- Standard
- ISO 4014
- Type
- Hexagon head bolt
- Size
- M8 × 30
- Thread
- M8 × 1
- Length L
- 30 mm
- Socket size s
- 13 mm
- Head height k
- 5.3 mm
- Drive
- External hexagon
- Head
- Hexagon head
Nominal values in millimetres as published in ISO 4014. Estimated weight 11.838 g per piece in steel (11.913 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M8 thread pageOther lengthsISO 4014 M8
All M8 specificationsInterchangeability
ISO 4014 is catalogued with DIN 931 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.
Choosing and fitting this size
ISO 4014 M8 × 30 is a hexagon head in M8, 30 mm long under the head, on a 1 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, M8 × 1 mm takes a 7 mm tap drill, and the external thread's minor diameter is 6.77 mm — that is the section carrying the load, not the nominal M8 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.