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Washers · ISO 7980 / DIN 127

M20 Spring Lock Washers Dimensions & Specifications

M20 Spring Lock Washers Dimensions & Specifications reference image

This page covers M20 Spring Lock Washers to ISO 7980 / DIN 127: the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (ISO 7980 / DIN 127 together with ISO 273, ISO 724 and ISO 898-1 where applicable).

M20 Dimensional Row (ISO 7980 / DIN 127)

For bolt sizeInner diameter d1 min (mm)Outer diameter d2 max (mm)Width b (mm)Thickness s (mm)Reference standard
M2020.233.610.04.0ISO 7980 / DIN 127

Spanner & Drive for M20 Spring Lock Washers

Drive geometry for M20 Spring Lock Washers is given by the row above; match the tool to the listed values.

Common Applications for M20 Spring Lock Washers

M20 Spring Lock Washers are commonly specified for high-load load-spreading on structural joints.

Installation Tips for M20 Spring Lock Washers

  • At M20 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.

Mating Parts for M20

A M20 flat washer pairs with a M20 bolt/screw and matching M20 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

Adjust the parameters in the drawing above and click "Request this configuration" to send the exact specification straight to this form.

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Specification
Business Information

Dimensions & Specifications (ISO 7980 / DIN 127)

For bolt sizeInner diameter d1 min (mm)Outer diameter d2 max (mm)Width b (mm)Thickness s (mm)Reference standard
M22.14.41.60.5ISO 7980 / DIN 127
M2.52.65.12.00.6ISO 7980 / DIN 127
M33.16.22.00.8ISO 7980 / DIN 127
M3.53.67.02.50.8ISO 7980 / DIN 127
M44.17.62.51.0ISO 7980 / DIN 127
M55.19.23.01.2ISO 7980 / DIN 127
M66.111.84.01.6ISO 7980 / DIN 127
M77.113.14.01.6ISO 7980 / DIN 127
M88.114.85.02.0ISO 7980 / DIN 127
M1010.218.16.02.2ISO 7980 / DIN 127
M1212.221.17.02.5ISO 7980 / DIN 127
M1414.224.18.03.0ISO 7980 / DIN 127
M1616.227.49.03.5ISO 7980 / DIN 127
M1818.229.49.03.5ISO 7980 / DIN 127
M2020.233.610.04.0ISO 7980 / DIN 127
M2222.535.911.04.0ISO 7980 / DIN 127
M2424.540.112.05.0ISO 7980 / DIN 127
M2727.544.812.05.0ISO 7980 / DIN 127
M3030.550.014.06.0ISO 7980 / DIN 127
M3636.560.016.07.0ISO 7980 / DIN 127

Frequently Asked Questions

What is the coarse-thread pitch of M20 for Spring Lock Washers?

For M20 the standard coarse pitch is 2.5 mm — this is the value used for Spring Lock Washers.

What clearance and tapping drill suit M20?

Use a 22 mm clearance hole (ISO 273 medium) for through-fixing, or a 17.5 mm tapping drill for a coarse M20 thread.

Should M20 Spring Lock Washers be tightened by torque or by angle?

For critical structural joints at M20, angle-controlled or stretch-controlled tightening is more repeatable than pure torque — the friction scatter at large diameters can dominate the torque signal.

What grip range is typical for M20 structural bolts?

Grip ranges are highly application-dependent at M20. As a guide, choose a length that gives at least 1× the thread diameter engagement in the nut plus 2–3 thread pitches projecting.

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.