DIN 912
Socket head cap screw,hex drive
| Size | P (mm, coarse) | dk (mm, max) | k (mm, max) | s (mm, nom.) | t (mm, min) | Break (kN, min) | Torque (N·m, µ 0.14) |
|---|---|---|---|---|---|---|---|
| 0.50 | 5.50 | 3.00 | 2.50 | 1.30 | 6.1 | 2.5 | |
| 0.70 | 7.00 | 4.00 | 3.00 | 2.00 | 10.7 | 5.8 | |
| 0.80 | 8.50 | 5.00 | 4.00 | 2.50 | 17.3 | 11.6 | |
| 1.00 | 10.00 | 6.00 | 5.00 | 3.00 | 24.6 | 19.6 | |
| 1.25 | 13.00 | 8.00 | 6.00 | 4.00 | 44.7 | 47.7 | |
| 1.50 | 16.00 | 10.00 | 8.00 | 5.00 | 70.7 | 93.8 | |
| 1.75 | 18.00 | 12.00 | 10.00 | 6.00 | 102.8 | 161.5 | |
| 2.00 | 24.00 | 16.00 | 14.00 | 8.00 | 191.1 | 398.4 | |
| 2.50 | 30.00 | 20.00 | 17.00 | 10.00 | 298.6 | 778.4 |
Values per ISO 4762:2004. Breaking load per ISO 898-1; torque per VDI 2230, µ = 0.14.
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Calculators that use this standard: Tightening torque and screw loads
About DIN 912
What it is
A screw with a round, straight-sided head and a hexagon socket, turned with a hex key (Allen key). The width across flats (s) is smaller than the thread: an M10 takes an 8 mm key and has a 16 mm head.
Where it is used
In machines, jigs, fixtures and tooling, where screws sit close together or the head must not stick out. The head sinks into a counterbore (DIN 974-1), so it ends flush with the surface: 18 mm wide and 10.6 mm deep for an M10. It comes in classes 8.8, 10.9 and 12.9, and in stainless A2-70 and A4-80.
DIN or ISO
ISO 4762 replaced DIN 912 in 1998; the current edition is from 2004. The screws are interchangeable and sold under both names. Two differences: ISO 4762 has no M1.4, M18, M22, M27 or M33, and on M1.6 to M2.5 it lets the socket be 0.02 mm wider.
Typical mistakes
- Taking the width across flats or the head for the thread size. M10 is the thread; the key is 8 mm.
- Measuring the length with the head. The length l runs from under the head to the tip.
- Drilling the plain counterbore when a washer goes under the head. With an ISO 7089 washer an M10 needs 24 mm by 12.8 mm.
- Swapping 12.9 for stainless without checking the load. A2-70 means 700 MPa tensile strength, 12.9 means 1200 MPa.
References
- DIN 912:1983 Hexagon socket head cap screws
- ISO 4762:2004 Hexagon socket head cap screws
- DIN 974-1:2008 Diameters of counterbores - Manufacturing dimensions - Part 1: Hexagon socket head cap screws and screws with cheese head or pan head
- ISO 7089:2000 Plain washers — Normal series — Product grade A
- ISO 898-1:2013 Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs
- ISO 3506-1:2020 Fasteners — Mechanical properties of corrosion-resistant stainless steel fasteners — Part 1: Bolts, screws and studs
- VDI 2230 Part 1:2015 Systematic calculation of highly stressed bolted joints — Joints with one cylindrical bolt