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Nuts · DIN 508

M20 T-Slot Nuts Dimensions & Specifications

M20 T-Slot Nuts Dimensions & Specifications reference image

This page covers M20 T-Slot Nuts to DIN 508: the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (DIN 508 together with ISO 273, ISO 724 and ISO 898-1 where applicable).

M20 Dimensional Row (DIN 508)

Thread sizeT-slot width (mm)Nut width b (mm)Total height h (mm)Key height h1 (mm)Hook width e (mm)Reference standard
M202225.025.015.022.4DIN 508 / GN505

Spanner & Drive for M20 T-Slot Nuts

Drive geometry for M20 T-Slot Nuts is given by the row above; match the tool to the listed values.

Common Applications for M20 T-Slot Nuts

M20 T-Slot Nuts are commonly specified for structural joints, flange connections and heavy equipment foundations.

Installation Tips for M20 T-Slot Nuts

  • 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

Pair M20 with the matching M20 bolt or screw, plus a M20 flat washer where required to distribute load on softer materials.

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 (DIN 508)

Thread sizeT-slot width (mm)Nut width b (mm)Total height h (mm)Key height h1 (mm)Hook width e (mm)Reference standard
M568.08.04.56.4DIN 508 / GN505
M6810.010.05.58.4DIN 508 / GN505
M81012.012.07.010.4DIN 508 / GN505
M81214.012.07.012.4DIN 508 / GN505
M101214.014.08.012.4DIN 508 / GN505
M101416.014.08.014.4DIN 508 / GN505
M121416.017.010.014.4DIN 508 / GN505
M121820.017.010.018.4DIN 508 / GN505
M161820.020.012.018.4DIN 508 / GN505
M162225.020.012.022.4DIN 508 / GN505
M202225.025.015.022.4DIN 508 / GN505
M202832.025.015.028.4DIN 508 / GN505
M242832.030.018.028.4DIN 508 / GN505

Frequently Asked Questions

Should M20 T-Slot Nuts 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.

What is the height of an M20 nut?

The nominal height of a style-1 ISO 4032 M20 nut is in the spec table on this page. Style-2 (thick) is approximately 1.1× this height; thin (ISO 4035 / DIN 439) is approximately 0.5×.

What is the coarse-thread pitch of M20 for T-Slot Nuts?

For M20 the standard coarse pitch is 2.5 mm — this is the value used for T-Slot Nuts.

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.