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Washers · Industry standard

M6 EPDM Sealing Washers Dimensions

Controlling dimensions to Industry standard, with tolerances and fit.

M6 EPDM Sealing Washers dimensions to Industry standard: inside diameter 6.4 mm, outside diameter 19 mm, thickness 2.5 mm.

Inside diameter
6.4 mm
Outside diameter
19 mm
Thickness
2.5 mm

Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.

M6 EPDM Sealing Washers Dimensions reference image

M6 EPDM Sealing Washers (Industry standard): the row from the product table, what the nominal bolt size controls in the assembly, and the notes that matter when specifying this size.

M6 Dimensional Row (Industry standard)

Screw sizeInner diameter d1 (mm)Outer diameter d2 (mm)Total thickness s (mm)EPDM thickness (mm)Backing materialTemperature range (deg C)Reference standard
M66.4192.51.5A2 stainless-40 to +130Industry standard

Common Applications for M6 EPDM Sealing Washers

M6 EPDM Sealing Washers are commonly specified for general-purpose load-spreading and locking under machine bolts.

Mating Parts for M6

A M6 flat washer pairs with a M6 bolt/screw and matching M6 nut.

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 Quote

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

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Specification
Business Information

Dimensions & Specifications (Industry standard)

Screw sizeInner diameter d1 (mm)Outer diameter d2 (mm)Total thickness s (mm)EPDM thickness (mm)Backing materialTemperature range (deg C)Reference standard
No.8 (4.2 mm)4.3112.01.0Galvanised steel-40 to +130Industry standard
No.10 (4.8 mm)5.0142.01.0Galvanised steel-40 to +130Industry standard
No.12 (5.5 mm)5.6162.51.5Galvanised steel-40 to +130Industry standard
No.14 (6.3 mm)6.4192.51.5Galvanised steel-40 to +130Industry standard
M66.4192.51.5A2 stainless-40 to +130Industry standard
M88.4223.02.0A2 stainless-40 to +130Industry standard
M1010.5253.02.0A2 stainless-40 to +130Industry standard
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.

  1. Wire rod feeding into a cold heading machine
    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.

  2. Thread rolling machine producing bolt threads
    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.

  3. Baskets of bolts staged for heat treatment
    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.

  4. Zinc plated bolts in a treatment basket
    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

Which washer dimensions matter most for M6?

For a flat washer, the outside diameter (the bearing surface) and the thickness control how the load is spread under the head and how much elastic preload is preserved. The inside diameter must clear the bolt body but not be so large that the head bears mostly on the washer's outer rim.

What is the coarse-thread pitch of M6 for EPDM Sealing Washers?

For M6 the standard coarse pitch is 1 mm — this is the value used for EPDM Sealing Washers.

What clearance and tapping drill suit M6?

Use a 6.6 mm clearance hole (ISO 273 medium) for through-fixing, or a 5 mm tapping drill for a coarse M6 thread.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.