Dimensional data for M8 Heavy-Duty Washers for Clamping Fixtures. Selection is by nominal bolt size rather than by thread, so the controlling figures are the ones in the row below together with the fit and tolerance the mating feature requires.
M8 Dimensional Row (DIN 6340)
| Size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness h (mm) | Reference standard |
|---|
| M8 | 8.4 | 23.0 | 4.0 | DIN 6340 |
Mating Parts for M8
A M8 flat washer pairs with a M8 bolt/screw and matching M8 nut.
Custom manufacturing · Made to drawing
Need heavy-duty washers for clamping fixtures in a size this table does not list?
This page covers M8 heavy-duty washers for clamping fixtures. Bore, outside diameter, thickness, temper and finish are the variables here — there is no thread to specify, so the fit and the bearing area are what the drawing has to pin 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 for M8 Heavy-Duty Washers for Clamping Fixtures
Heavy-Duty Washers for Clamping Fixtures are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M6 to M30 (nominal bolt size).
Industries that specify Heavy-Duty Washers for Clamping Fixtures
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Presses
high-load clamping.
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Machine tools
clamps on T-slot tables.
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Fixtures
repeated clamping.
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Die sets
hardened bearing faces.
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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.
Typical applications
- working with T-slot bolts
- bearing hardened faces under nuts
- preventing deformation under repeated clamping
- spreading load on fixtures
- maintaining bolt tension in a joint that settles
- spreading clamp load over a soft or oversized bearing face
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.
- 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.
Where to use something else
- Do not use a soft plain washer in a clamping fixture; it dishes and the clamp loosens.
Full application guide: where Heavy-Duty Washers for Clamping Fixtures are used, how to specify them, and the cases they are wrong for
