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.
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.
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
Start with the size and quantity you need. Include the following details where available; remaining requirements can be confirmed by email.
- Thread & mating part
- Give the nominal diameter, pitch, thread system and mating bolt or rod specification.
- Nut form
- Specify the exact series, standard and edition, or attach a dimensioned drawing.
- Material & finish
- State the required grade or property class and finish. Listed options are reviewed for the requested size.
- Quantity & destination
- Give the quantity for each specification and the delivery destination.
Confirmed per order: MOQ, sample arrangements, lead time, supply combinations and inspection documents. A requested delivery date is reviewed during quotation.
Request a quotation →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.
