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DIN 934

Hexagon nut,regular

Superseded by ISO 4032 (2012) · Still sold as DIN 934 · Sizes M1–M64
DIN 934 nut cut in half, showing the thread and the height mDIN 934 nut cut in half, showing the thread and the height m
Side view, in section
DIN 934 nut seen from its face, with the width across flats (s) and the width across corners eDIN 934 nut seen from its face, with the width across flats (s) and the width across corners e
Face view
SizeP (mm, coarse)s (mm, nom.)e (mm, min)m (mm, max)dw (mm, min)
M3
0.505.506.012.404.60
M4
0.707.007.663.205.90
M5
0.808.008.794.706.90
M6
1.0010.0011.055.208.90
M8
1.2513.0014.386.8011.60
M10
1.5016.0017.778.4014.60
M12
1.7518.0020.0310.8016.60
M16
2.0024.0026.7514.8022.50
M20
2.5030.0032.9518.0027.70
M24
3.0036.0039.5521.5033.30

Values per ISO 4032:2012. The values follow this edition; the current one is ISO 4032:2023.Differs from DIN 934

Verified data

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Calculators that use this standard: Tightening torque and screw loads · Bolted joint configurator

About DIN 934

What it is

The regular hexagon nut, with a coarse thread. Its width across flats (s) matches the hex head screw of the same size: an M10 takes a 17 mm spanner and is 8 mm high.

Where it is used

On through bolts with hex head screws (DIN 933, ISO 4017) and on threaded rods, from M1 to M64.

DIN or ISO

ISO 4032 replaced DIN 934. ISO nuts are taller in most sizes: an M8 is 6.8 mm high, not 6.5, and an M10 is 8.4 mm, not 8. The same four sizes as the screws changed their width across flats: M10 (17 to 16 mm), M12 (19 to 18), M14 (22 to 21) and M22 (32 to 34). ISO 4032 starts at M1.6; M1 to M1.4 are DIN only.

Typical mistakes

  • Using one spanner for a DIN 933 screw and an ISO 4032 nut of M10 to M14 or M22: they differ by 1 or 2 mm.
  • Counting on the DIN height in a tight space. An ISO nut needs a few tenths more.
  • Choosing the screw so the nut sits on its last thread. The screw must stick out at least two pitches (ISO 4753).

References