M22 Washer Dimensions & Size

M22 washer dimensions are standardized for high-capacity industrial and structural applications, including heavy-duty transmission systems, structural steel frameworks, railway engineering, and specialized mining equipment. Specifically designed for fasteners with a 22 mm nominal diameter, these components ensure stable load distribution and protect mating surfaces from damage during high-torque tightening. This chart covers Form A plain washers, which feature a flat surface without a chamfer (unlike Form B).

The M22 size is primarily specified by the Normal Series (DIN 125A / ISO 7089 standard. These washers typically feature a hardness of 200 HV or 300 HV (Vickers Hardness), providing the structural integrity required to prevent “cupping” or deformation under the massive clamping forces of high-tensile bolts.

Note: While these values reflect standard manufacturer datasheets, actual dimensions and tolerances may vary based on material (e.g., Stainless Steel vs. Zinc-Plated Steel) and manufacturing class. Always verify with the official product datasheet for critical applications.

Washer dimension diagram showing inner diameter, outside diameter, and thickness
M22 Standard Series Washer – DIN 125A/ISO 7089
Dimension Size (mm)
Min Max
Inner Diameter 23 23.33
Outside Diameter 38.38 39
Thickness 2.7 3.3
  • Inner Diameter – The diameter of the hole, designed to clear the bolt/screw thread.
  • Outside Diameter – The total width of the washer, determining the load distribution area.
  • Thickness – The height of the washer, providing the spacing and structural support.
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Frequently Asked Questions

What does the “M22” designation mean on a washer?

The “M” stands for Metric, and the number represents the nominal thread diameter of the screw or bolt. An M22 washer is designed specifically for fasteners with a 22 mm nominal major diameter.

What is the difference between Form A and Form B washers?

The difference lies in the outer edge finish. Form A washers have a square, flat edge and are the most common. Form B washers include a 30° to 40° chamfer (beveled edge) on one side, according to DIN 125B and ISO 7090 standards.

What does the HV rating mean on a washer?

HV stands for Vickers Hardness. For M22 fasteners, a rating of 200 HV or 300 HV is standard for steel and stainless steel. This ensures the washer maintains its flatness and resists indentation even when subjected to the extreme torque levels required for structural joints.

In which materials are M22 washers commonly available?

M22 washers are most frequently produced in A2 (304) and A4 (316) Stainless Steel for corrosion resistance. They are also widely available in Hot-Dip Galvanized Steel for outdoor structural work and Zinc-Plated Steel for industrial machinery.