Applications and selection
Assemblies using a matching square pocket, channel or external wrench access.
State width, thickness, thread and pocket clearance. Include chamfer or bearing-face requirements where they affect the fit.
Dimensions & technical reference
DIN 557:1994
The reference includes alternative wrench widths at M10 and M12; SW identifies across-flats width. Its size range ends at M16. Larger inquiries need a drawing.
| Nominal size | P | s max | m max | e max |
|---|---|---|---|---|
| M5 | 0.8 | 8 | 4 | 11.3 |
| M6 | 1 | 10 | 5 | 14.1 |
| M8 | 1.25 | 13 | 6.5 | 18.4 |
| M10 SW16 | 1.5 | 16 | 8 | 22.6 |
| M10 | 1.5 | 17 | 8 | 24 |
| M12 SW18 | 1.75 | 18 | 10 | 25.4 |
| M12 | 1.75 | 19 | 10 | 26.9 |
| M16 | 2 | 24 | 13 | 33.9 |
Dimensional source: 164580 · DIN 557:1994 ↗. “—” means no value listed for this combination. P is thread pitch; min / max are dimensional limits. The selection above is not the full standard or a stock list.
Catalog inquiry range: M6 - M36. Availability, lengths, grades and finishes are confirmed by quotation. Sizes outside the cited reference table require the applicable standard dimensions or an approved drawing. Quote the exact standard and edition; DIN, ISO and U.S. references are not automatically interchangeable.
Materials, surface finishes and standards
Materials for this series: Carbon Steel, Stainless Steel. Surface finishes: HDG, Plain, Stainless. Compatibility between the grade, finish and operating environment needs to be confirmed.
For titanium, nickel alloy or other non-ferrous requirements, include the exact material grade and drawing. Required mechanical properties, inspection documents and traceability should be stated in the inquiry.
Related U.S. reference for square nuts. Confirm across-flats, thickness, bearing surface and thread system. Standards from different systems can vary in dimensions, threads, product scope and test requirements. Confirm the exact designation and edition in the quotation.
Ordering standard
DIN 557:1994
United States references for a separate inquiry: ASME B18.2.2 (inch). Confirm the exact form, thread system and drawing before quoting.
What to send for a quotation
- Square Nuts or your part number, with the relevant standard and edition.
- Exact dimensions, thread details, quantity and any critical tolerances.
- Material grade, surface finish, inspection requirements and delivery destination.
- For customization, a drawing revision and a description of the mating assembly.
Common questions about square nuts
What should I check for a square nut in a channel?
Match the nut width and thickness to the channel clearance, then confirm the thread and the intended anti-rotation engagement.
Can I request a size or material outside this listing?
Yes. Send the required dimensions and exact material grade for review. A quotation is needed to confirm feasibility, price and lead time.