Skip to content

DIN 125-A

Plain washer,normal series

Superseded by ISO 7089 (2000) · Still sold as DIN 125-A · Sizes M1.6–M56
DIN 125-A washer cut in half, with the thickness hDIN 125-A washer cut in half, with the thickness h
Side view, in section
DIN 125-A washer seen from its face, with the hole d1 and the outer diameter d2DIN 125-A washer seen from its face, with the hole d1 and the outer diameter d2
Face view
Sized1 (mm, nom.)d2 (mm, nom.)h (mm, nom.)
M3
3.207.000.50
M4
4.309.000.80
M5
5.3010.001.00
M6
6.4012.001.60
M8
8.4016.001.60
M10
10.5020.002.00
M12
13.0024.002.50
M16
17.0030.003.00
M20
21.0037.003.00
M24
25.0044.004.00

Values per ISO 7089:2000.

Verified data

We have checked this data against reliable sources.MechLab Geek accepts no liability for any use of this data or its consequences. Check it before you use it. Legal notice.Spotted a mistake? Let us know.

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

About DIN 125

What it is

The plain flat washer of the normal series, form A (no chamfer). It is named after the screw, not its hole: an M10 washer has a 10.5 mm hole, a 20 mm outside diameter and is 2 mm thick. From M39, DIN 125-1 gives form B (with chamfer) only, with the same sizes.

Where it is used

Under hex heads and nuts, to spread the load on soft or slotted parts and protect the surface, from M1.6 to M64.

DIN or ISO

ISO 7089 replaced DIN 125-1 form A. Up to M36 the washers are the same. Above M36, DIN 125 washers have a smaller hole and are thinner: an M42 has a 43 mm hole and is 7 mm thick, against 45 and 8 mm in ISO 7089.

Typical mistakes

  • Ordering by the hole. An M10 washer is the one for an M10 screw, with a 10.5 mm hole.
  • Putting a normal washer under a socket head screw in its counterbore. It needs a wider, deeper counterbore (24 × 12.8 mm for an M10), or the small series DIN 433.
  • Mixing DIN and ISO washers above M36: hole and thickness differ.

References