M2.6 Washer Dimensions & Size

Q: What does the “M2.6” designation mean on a washer?

The “M” stands for Metric, and the number represents the nominal thread diameter of the screw or bolt the washer is intended to fit. An M2.6 washer is designed specifically for fasteners with a 2.6 mm nominal major diameter.

Q: What does the HV rating mean on a washer?

HV stands for Vickers Hardness. It is a measurement of the material’s resistance to indentation. For M2.6 fasteners, a rating of 200 HV or 300 HV is standard for steel and stainless steel, ensuring the washer maintains its shape and prevents “cupping” under torque.

Q: 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.

Q: Which standard governs M2.6 washers?

M2.6 washers are primarily governed by the Normal Series specifications found in DIN 125A or ISO 7089. Unlike other miniature sizes, a dedicated “Small Series” (DIN 433) or “Large Series” (DIN 9021) is not commonly utilized for the M2.6 designation in standard datasets.

Q: In which materials are M2.6 washers commonly available?

These washers are most frequently produced in A2 (304) Stainless Steel for corrosion resistance. They are also available in Zinc-Plated Steel and Brass for specific industrial or electronic applications.

M2.6 washer dimensions are standardized for high-precision applications, including consumer electronics, legacy component repairs, precision instrumentation, and micro-mechanical assemblies. Specifically designed for fasteners with a 2.6 mm nominal diameter, these components ensure stable load distribution and protect mating surfaces from damage during tightening. This chart covers Form A plain washers, which feature a flat surface without a chamfer (unlike Form B).

The M2.6 size is primarily standardized under the Normal Series. Consequently, this chart is based on the DIN 125A / ISO 7089 standards. Based on these standards, M2.6 washers typically feature a hardness of 200 HV or 300 HV (Vickers Hardness), providing the necessary structural integrity to prevent deformation under the clamping force of high-tensile bolts used in electrical housings and mounting brackets.

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

Washer dimension diagram showing inner diameter, outside diameter, and thickness

M2.6 Standard Series Washer – DIN 125A/ISO 7089
Dimension	Size (mm)
Dimension	Min	Max
Inner Diameter	2.8	2.94
Outside Diameter	6.64	7
Thickness	0.45	0.55

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 “M2.6” designation mean on a washer?

The “M” stands for Metric, and the number represents the nominal thread diameter of the screw or bolt the washer is intended to fit. An M2.6 washer is designed specifically for fasteners with a 2.6 mm nominal major diameter.

What does the HV rating mean on a washer?

HV stands for Vickers Hardness. It is a measurement of the material’s resistance to indentation. For M2.6 fasteners, a rating of 200 HV or 300 HV is standard for steel and stainless steel, ensuring the washer maintains its shape and prevents “cupping” under torque.

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.

Which standard governs M2.6 washers?

M2.6 washers are primarily governed by the Normal Series specifications found in DIN 125A or ISO 7089. Unlike other miniature sizes, a dedicated “Small Series” (DIN 433) or “Large Series” (DIN 9021) is not commonly utilized for the M2.6 designation in standard datasets.

In which materials are M2.6 washers commonly available?

These washers are most frequently produced in A2 (304) Stainless Steel for corrosion resistance. They are also available in Zinc-Plated Steel and Brass for specific industrial or electronic applications.