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Thin Square Nut Dimensions (DIN 562, M1.6 to M10)

Guide · Updated October 28, 2026

DIN 562 covers thin square nuts M1.6 to M10, product grade B. Square width s, width across corners e min and nut height m agree across the Spinelli DIN 562 data sheet, the GlobalFastener DIN 562 table, the Daniel Gruppe DIN 562 sheet (M2 to M10), the Bossard BN 3525 sheet (M3 to M8) and the Marmech DIN 562 table (M2 to M10). M10 appears with s = 16 mm (Spinelli, Daniel, GlobalFastener) and s = 17 mm (Daniel, GlobalFastener, Marmech), so we show both. Not shown: m min and s min tolerances, and weights, because fewer sources list them. Check the current edition or your supplier for critical work.

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Step by step

  1. Confirm the size: DIN 562 covers thin square nuts M1.6 to M10, product grade B, often pressed with no chamfer.
  2. Read the square: s is the square width across flats: M3 5.5 mm, M4 7 mm, M6 10 mm, M8 13 mm.
  3. Check which M10: M10 is listed with s = 16 mm (current) or 17 mm (older wrench size). Measure a sample or ask the supplier.
  4. Read the height: m is the nut height, roughly half of DIN 557: M4 2.2 mm, M6 3.2 mm, M8 4 mm.
  5. Allow for corners: e min is the diagonal: M6 12.7 mm. A pocket or slot must be wider than s but narrower than e to stop the nut turning.
  6. Pick the wrench: Use an open-end wrench equal to s, or trap the nut in a pocket; it is too thin for much wrench torque.

DIN 562 thin square nut dimensions (mm)

Columns: thread size (coarse pitch), square width s, width across corners e min, nut height m. M3.5 is non-preferred; M10 comes in two square widths.

Worked example: M3 nut pocket in a printed part

An M3 DIN 562 nut is 5.5 mm square, 7.0 mm across corners and 1.8 mm thick. A side-entry slot 5.7 mm wide and 2.1 mm tall lets it slide in, and the 7 mm corners stop it turning. Bolt length: 3 mm plate + 1.8 mm nut = 4.8 mm, so an M3 x 6 gives a little thread past the nut. Compared with a DIN 557-height nut the pocket saves depth, but there are only about 3.6 threads engaged.

DIN 562 vs DIN 557 heights

Where both overlap: M5 2.7 vs 4 mm, M6 3.2 vs 5 mm, M8 4 vs 6.5 mm, M10 5 vs 8 mm (DIN 562 vs DIN 557). Square widths match at M5 to M8.

Common problems

FAQ

What is a DIN 562 nut?

A thin (low) square nut, product grade B, used in 3D printed and molded pockets, slots, electronics and light assemblies where a flat side stops it turning.

How is DIN 562 different from DIN 557?

DIN 562 is about half the height and covers smaller sizes (M1.6 to M10). DIN 557 is the standard height square nut, M5 to M16, grade C.

What size pocket fits a DIN 562 M3 nut?

The nut is 5.5 mm square and 1.8 mm thick. Many designers use about 5.7 to 5.8 mm by 2 to 2.2 mm deep, then test print or test fit.

Why are there two M10 sizes?

DIN 562 lists M10 with s = 16 mm; older editions and some catalogs show 17 mm. Check before you cut a slot.

Can a DIN 562 nut take full bolt load?

No. With so few threads engaged it is meant for light loads and positioning, not full strength joints.

How is DIN 562 different from DIN 928?

DIN 928 is a square weld nut with weld projections. DIN 562 is a plain thin square nut.

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General shop information only — follow your drawing, tool maker's data and your quality system.