DIN 436 specifies the dimensions and tolerances for square plate washers (din 436). The full dimensional table is reproduced below, followed by the DIN, ISO and ASME parts that match or supersede it.
- Standard
- DIN 436
- Product
- Square Plate Washers (DIN 436)
- Governing standards
- DIN 436
Equivalence between national standards is dimensional, not always metallurgical. Check the property class separately when substituting.
DIN 436 is the standard cited for square plate washers (din 436). This page sets out what the standard controls for this part, reproduces the dimensional table supplied against it, and notes the related designations referenced on drawings.
DIN 436 — Scope
The table below lists the dimensions catalogued for square plate washers (din 436) under DIN 436. The scope of DIN 436 itself is not summarised here — where a figure matters, confirm it against the published document.
Tolerance & Product Grades
Product grade is a concept from dimensional fastener standards and does not apply to DIN 436. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by DIN 436
| For bolt size | Inner diameter d1 (mm) | Side length (mm) | Thickness t (mm) | Bearing area (mm²) | Bearing vs DIN 125 washer | Material | Reference standard |
|---|
| M10 | 11 | 40 | 3 | 1505 | approx. 5.4x | Steel, hot-dip galvanised | DIN 436 |
| M12 | 14 | 50 | 4 | 2346 | approx. 5.8x | Steel, hot-dip galvanised | DIN 436 |
| M16 | 18 | 58 | 5 | 3110 | approx. 5.1x | Steel, hot-dip galvanised | DIN 436 |
| M20 | 22 | 68 | 6 | 4244 | approx. 5.2x | Steel, hot-dip galvanised | DIN 436 |
| M24 | 26 | 80 | 6 | 5869 | approx. 5.3x | Steel, hot-dip galvanised | DIN 436 |
Companion Standards
A complete specification for square plate washers (din 436) normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. DIN 436 is one of them, not all of them.
When to Specify DIN 436
DIN 436 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.
Custom manufacturing · Made to drawing
Need a washer to this standard in a non-standard size?
Parts built to DIN 436 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by stamping or punching.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom washer manufacturingSend a drawing
Applications & Industries
Square Plate Washers are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M10 to M24 (nominal bolt size).
Industries that specify Square Plate Washers
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Civil & temporary works
Formwork and falsework connections.
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Timber engineering
Bolted timber connections in frames, decks and posts.
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Agricultural structures
Heavy timber bolting exposed to weather.
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Rotating & vibrating plant
Spring, tooth and wedge types that maintain or lock bolt tension.
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Steel fabrication
Spreading load under a head or nut and protecting the surface finish.
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Machine building & OEM
Setting bearing area on soft alloy, plastic and oversized holes.
Typical applications
- a flat seat on a sawn face that will not rotate into the grain
- spreading a bolt head over enough timber to stay under the crushing limit
- maintaining bolt tension in a joint that settles
- spreading clamp load over a soft or oversized bearing face
- protecting a painted or plated surface under a turned nut
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- Exterior structural
- Hot-dip galvanised options for external steelwork; allow for the thicker coating in the mating thread.
- Hardness matters
- Under a high-strength bolt a soft washer embeds into the joint and preload is lost — specify a hardened washer for structural bolting.
Full application guide: where Square Plate Washers are used, how to specify them, and the cases they are wrong for
