M36 Washer Dimensions & Size
The M36 size is a primary heavy-industry standard available in three series: the Normal Series (DIN 125A / ISO 7089) for standard load distribution, the Large Series (DIN 9021 / ISO 7093) for a massive increase in surface area, and the Small Series (DIN 433 / ISO 7092) for applications where radial space is limited. Based on these standards, M36 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 structural bolts.
Note: While these values reflect standard manufacturer datasheets, actual dimensions and tolerances may vary based on material (e.g., Stainless Steel vs. Hot-Dip Galvanized Steel) and manufacturing class. Always verify with the official product datasheet for critical applications.
| M36 Standard Series Washer – DIN 125A/ISO 7089 | ||
|---|---|---|
| Dimension | Size (mm) | |
| Min | Max | |
| Inner Diameter | 37 | 37.62 |
| Outside Diameter | 64.8 | 66 |
| Thickness | 4.4 | 5.6 |
| M36 Large Series Washer – DIN 9021/ISO 7093 | ||
|---|---|---|
| Dimension | Size (mm) | |
| Min | Max | |
| Inner Diameter | 39 | 40 |
| Outside Diameter | 107.8 | 110 |
| Thickness | 6.8 | 9.2 |
| M36 Small Series Washer – DIN 433/ISO 7092 | ||
|---|---|---|
| Dimension | Size (mm) | |
| Min | Max | |
| Inner Diameter | 37 | 37.62 |
| Outside Diameter | 56.8 | 58 |
| Thickness | 4.4 | 5.6 |
- 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 “M36” designation mean on a washer?
The “M” stands for Metric, and the number represents the nominal thread diameter of the screw or bolt. An M36 washer is designed specifically for fasteners with a 36 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.
When should I use a Large Series (DIN 9021) M36 washer?
The Large Series (DIN 9021 / ISO 7093) features a massive outside diameter of 110 mm, which is more than three times the nominal thread size. It is used when fastening into softer materials like structural timber or when bridging oversized holes in heavy base plates where the clamping force must be spread over a maximum area to ensure joint stability.
What does the HV rating mean on a washer?
HV stands for Vickers Hardness. For M36 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 large-scale structural mechanical joints.
What is the difference between Small Series (DIN 433) and Normal Series?
The Small Series (DIN 433 / ISO 7092) has a narrower outside diameter 58 mm compared to the Normal Series 66 mm. It is specifically intended for use with Socket Head Cap Screws or in recessed counterbores where a standard-width washer would be too large to fit the available housing.
In which materials are M36 washers commonly available?
M36 washers are most frequently produced in Hot-Dip Galvanized Steel for outdoor structural work due to its superior corrosion protection. They are also widely available in A4 (316) Stainless Steel for marine environments and Plain (Black) Steel for heavy industrial machinery.