7 catalogued sizes, dimensioned to Industry standard. Pick any row and the technical drawing redraws to it.
EPDM Sealing Washers to Industry standard are catalogued in sizes M6 to M10, with id 4.3-10.5 mm, od 11-25 mm, thick 2-3 mm. 7 sizes are held in the table below, and the technical drawing redraws to whichever row you select.
Standard
Industry standard
Size range
M6-M10
ID
4.3-10.5 mm
OD
11-25 mm
Catalogued sizes
7
Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.
EPDM Sealing Washers are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from No.8 (4.2 mm) to M10 (nominal bolt size).
Industries that specify EPDM Sealing Washers
Roofing & claddingFixings that must keep water out.
Automotive serviceService items replaced at every oil change.
Hydraulics & fuel systemsBanjo bolts, sump plugs and pressure fittings.
Rotating & vibrating plantSpring, tooth and wedge types that maintain or lock bolt tension.
Steel fabricationSpreading load under a head or nut and protecting the surface finish.
Machine building & OEMSetting bearing area on soft alloy, plastic and oversized holes.
Typical applications
crush washers are single use by design
sealing a threaded fitting against pressure
protecting a painted or plated surface under a turned nut
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.
Sealed joints
Used where the fixing has to keep water or air out as well as hold — the elastomer, not the fastener, decides service life.
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.
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.
Dimensioned line drawing of No.8 (4.2 mm) EPDM Sealing Washers to Industry standard. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.
Inner diameter d1 (mm)
4.3
Outer diameter d2 (mm)
11
Total thickness s (mm)
2.0
EPDM thickness (mm)
1.0
Backing material
Galvanised steel
Temperature range (deg C)
-40 to +130
Sends the selected values to the quote form below.
Request a Quotation for EPDM Sealing Washers
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (Industry standard)
Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.
EPDM Sealing Washers conform to Industry standard. As washers, they are specified by the dimensions in the table below; this page also covers materials, finishes and typical uses.
What Are EPDM Sealing Washers?
EPDM Sealing Washers are washers defined by Industry standard. 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.
Specification Guides
Each size, material and standard of EPDM Sealing Washers has its own reference page with the figures for that one configuration.
EPDM Sealing Washers are supplied to order. Pricing starts from approximately US$0.040 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.
Custom manufacturing · Made to drawing
Need a EPDM sealing washers outside the standard range?
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.
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.
Video: EPDM Sealing Washers
Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.
Frequently Asked Questions
What is the controlling standard for EPDM Sealing Washers?
EPDM Sealing Washers are manufactured to Industry standard. The dimensional values on this page follow that standard.
What is the size range of EPDM Sealing Washers?
The table on this page lists 7 sizes for EPDM Sealing Washers, ranging from No.8 (4.2 mm) to M10. Sizes outside the table can be quoted on request.
In which materials are EPDM Sealing Washers supplied?
EPDM Sealing 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 EPDM Sealing 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.
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