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Washers · ISO 7980 / DIN 127

M12 Spring Lock Washers Dimensions & Specifications

M12 Spring Lock Washers Dimensions & Specifications reference image

The M12 size of Spring Lock Washers is dimensioned by ISO 7980 / DIN 127. The tables below give the dimensional row from the standard, the drill and spanner sizes that go with it, and the assembly torque per property class. The technical drawing on this page redraws to the exact values selected.

M12 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
M1212.221.17.02.5ISO 7980 / DIN 127

Spanner & Drive for M12 Spring Lock Washers

Drive geometry for M12 Spring Lock Washers is given by the row above; match the tool to the listed values.

Common Applications for M12 Spring Lock Washers

M12 Spring Lock Washers are commonly specified for medium-duty structural joints.

Mating Parts for M12

A M12 flat washer pairs with a M12 bolt/screw and matching M12 nut.

When to Step Up or Down from M12

When the joint preload approaches the proof load of M12 class 8.8, step up to M16 class 8.8 (or move to M12 class 10.9). When the joint is over-specified, M10 often saves weight and cost without losing the safety margin.

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 clearance and tapping drill suit M12?

Use a 13.5 mm clearance hole (ISO 273 medium) for through-fixing, or a 10.2 mm tapping drill for a coarse M12 thread.

Which washer dimensions matter most for M12?

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 M12 for Spring Lock Washers?

For M12 the standard coarse pitch is 1.75 mm — this is the value used for Spring Lock 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.