Washers · Non-Metallic Washers

Insulating Fibre Washers Trade series (vulcanised fibre washer) (EH-WSH-FIB)

6 catalogued sizes, dimensioned to Trade series (vulcanised fibre washer). Pick any row and the technical drawing redraws to it.

Insulating Fibre Washers to Trade series (vulcanised fibre washer) are catalogued in sizes M3 to M10, with id 3.2-10.5 mm, od 7-20 mm, thick 0.5-1 mm. 6 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

Standard: Trade series (vulcanised fibre washer)
Size range: M3-M10
ID: 3.2-10.5 mm
OD: 7-20 mm
Catalogued sizes: 6

Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.

Applications & Industries

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

Food & pharma equipment Non-marking, non-contaminating washers in washdown areas.
Electrical & electronics Insulating and isolating fixings in panels and boards.
Chemical & process Chemically resistant seating under a fastener.
Machine building & OEM Setting bearing area on soft alloy, plastic and oversized holes.
Timber & construction Large-diameter washers that stop pull-through in softer material.
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

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

Request a Quotation for Insulating Fibre Washers Trade series (vulcanised fibre washer) (EH-WSH-FIB)

The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

Request a Quotation

Specification

Item / category Standard Size(s) Material / finish Quantity

Business Information

Company * Contact Name * Email * Phone (with country code) Country / Region

Notes

Dimensions & Specifications (Trade series (vulcanised fibre washer))

Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.

For bolt size	Inner diameter d1 (mm)	Outer diameter d2 (mm)	Thickness t (mm)	Dielectric strength (kV/mm)	Max temperature (u00b0C)	Material	Moisture
M3	3.2	7.0	0.5	10	105	Vulcanised fibre	Hygroscopic u2014 indoor use
M4	4.3	9.0	0.5	10	105	Vulcanised fibre	Hygroscopic u2014 indoor use
M5	5.3	10.0	0.8	10	105	Vulcanised fibre	Hygroscopic u2014 indoor use
M6	6.4	12.0	0.8	10	105	Vulcanised fibre	Hygroscopic u2014 indoor use
M8	8.4	16.0	1.0	10	105	Vulcanised fibre	Hygroscopic u2014 indoor use
M10	10.5	20.0	1.0	10	105	Vulcanised fibre	Hygroscopic u2014 indoor use

Insulating Fibre Washers conform to Trade series (vulcanised fibre washer). As washers, they are specified by the dimensions in the table below; this page also covers materials, finishes and typical uses.

What Are Insulating Fibre Washers?

Insulating Fibre Washers are washers defined by Trade series (vulcanised fibre washer). They are selected by nominal bolt size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.

Materials & Finishes

Common materials include carbon steel (typically zinc plated or hot-dip galvanized), hardened or case-hardened steel where wear matters, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, hardness where relevant, and the surface finish appropriate to your application and environment.

Pricing

Insulating Fibre Washers are supplied to order. Pricing starts from approximately US$0.020 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

01

Cold heading

Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

Head dimensions and under-head radius checked at set-up and per shift.
02

Thread rolling

Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

Go / no-go ring gauges to ISO 965 tolerance class 6g.
03

Heat treatment

Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

Core hardness and tensile tested per lot to ISO 898-1.
04

Surface treatment

Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

Coating thickness and neutral salt spray hours to ISO 9227.

Frequently Asked Questions

What is the controlling standard for Insulating Fibre Washers?

Insulating Fibre Washers are manufactured to Trade series (vulcanised fibre washer). The dimensional values on this page follow that standard.

What sizes are available for Insulating Fibre Washers?

The table on this page lists 6 sizes for Insulating Fibre Washers, ranging from M3 to M10. Sizes outside the table can be quoted on request.

In which materials are Insulating Fibre Washers supplied?

Insulating Fibre Washers are supplied in carbon steel (zinc plated / HDG) and stainless A2 / A4, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Insulating Fibre Washers.

How do I request a quotation?

Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.