Skip to content
WhatsApp
Request a Quote
Washers · DIN 7603 Type A

M14 Aluminum Flat Sealing Washers Dimensions

Controlling dimensions to DIN 7603 Type A, with tolerances and fit.

M14 Aluminum Flat Sealing Washers dimensions to DIN 7603 Type A: inside diameter 14.2 mm, outside diameter 17.9 mm, thickness 1 mm.

Inside diameter
14.2 mm
Outside diameter
17.9 mm
Thickness
1 mm

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

M14 Aluminum Flat Sealing Washers Dimensions reference image

Dimensional data for M14 Aluminum Flat Sealing Washers. 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.

M14 Dimensional Row (DIN 7603 Type A)

For bolt sizePitch (mm)Inside diameter (mm)Outside diameter (mm)Thickness options (mm)MaterialReference standard
M141.514.217.91.0 / 1.5 / 2.0aluminumDIN 7603 Type A

Mating Parts for M14

A M14 flat washer pairs with a M14 bolt/screw and matching M14 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.

Request a Quotation

Specification
Business Information

Dimensions & Specifications (DIN 7603 Type A)

For bolt sizePitch (mm)Inside diameter (mm)Outside diameter (mm)Thickness options (mm)MaterialReference standard
M81.08.211.41.0 / 1.5 / 2.0aluminumDIN 7603 Type A
M101.010.213.41.0 / 1.5 / 2.0aluminumDIN 7603 Type A
M121.512.215.91.0 / 1.5 / 2.0aluminumDIN 7603 Type A
M141.514.217.91.0 / 1.5 / 2.0aluminumDIN 7603 Type A
M161.516.219.91.0 / 1.5 / 2.0aluminumDIN 7603 Type A
M201.520.223.91.0 / 1.5 / 2.0aluminumDIN 7603 Type A
M301.530.335.91.0 / 1.5 / 2.0aluminumDIN 7603 Type A
M482.048.354.91.0 / 1.5 / 2.0aluminumDIN 7603 Type A

Applications & Industries for M14 Aluminum Flat Sealing Washers

Where Aluminum Flat Sealing Washers are used, and what decides the specification in each case. Stocked from M8 to M48 (nominal bolt size).

Industries that specify Aluminum Flat Sealing Washers

  • Hydraulic service Crush seals under banjo bolts, plugs and threaded fittings.
  • Fuel systems Soft-metal sealing at machined fitting faces.
  • Automotive maintenance Single-use sealing washers replaced during fluid service.
  • Pneumatic equipment Lightweight sealing at air and instrument connections.
  • Steel fabrication Spreading load under a head or nut and protecting the surface finish.
  • Machine building & OEM Setting bearing area on soft alloy, plastic and oversized holes.

Typical applications

  • crushing a flat aluminum ring between two machined faces
  • sealing a threaded fitting without an elastomer gasket
  • matching the inside and outside diameters to the fitting seat
  • replacing the washer after it has been compressed in service
  • 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.
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 reuse a crushed washer or tighten it against a damaged sealing face; leakage is the usual result.

Full application guide: where Aluminum Flat Sealing Washers are used, how to specify them, and the cases they are wrong for

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

What clearance and tapping drill suit M14?

Use a 15.5 mm clearance hole (ISO 273 medium) for through-fixing, or a 12 mm tapping drill for a coarse M14 thread.

Which washer dimensions matter most for M14?

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 M14 for Aluminum Flat Sealing Washers?

For M14 the standard coarse pitch is 2 mm — this is the value used for Aluminum Flat Sealing Washers.

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.