M8 Insulating Fibre Washers (Trade series (vulcanised fibre washer)): the row from the product table, what the nominal bolt size controls in the assembly, and the notes that matter when specifying this size.
M8 Dimensional Row (Trade series (vulcanised fibre washer))
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Dielectric strength (kV/mm) | Max temperature (u00b0C) | Material | Moisture |
|---|
| M8 | 8.4 | 16.0 | 1.0 | 10 | 105 | Vulcanised fibre | Hygroscopic u2014 indoor use |
Mating Parts for M8
A M8 flat washer pairs with a M8 bolt/screw and matching M8 nut.
Custom manufacturing · Made to drawing
Need insulating fibre washers in a size this table does not list?
This page covers M8 insulating fibre washers. 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 Insulating Fibre Washers
The sectors that buy Insulating Fibre Washers, and the duty each one buys them for. Stocked from M3 to M10 (nominal bolt size).
Industries that specify Insulating Fibre Washers
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Food & pharma equipment
Non-marking, non-contaminating washers in washdown areas.
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Electrical & electronics
Insulating and isolating fixings in panels and boards.
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Chemical & process
Chemically resistant seating under a fastener.
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Machine building & OEM
Setting bearing area on soft alloy, plastic and oversized holes.
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Timber & construction
Large-diameter washers that stop pull-through in softer material.
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Rotating & vibrating plant
Spring, tooth and wedge types that maintain or lock bolt tension.
Typical applications
- protecting a soft or finished surface under a head
- insulating a fastener electrically from the panel
- separating dissimilar metals to break a galvanic cell
- 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.
- 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 Insulating Fibre Washers are used, how to specify them, and the cases they are wrong for
