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Quick answer: DIN 934 and ISO 4032 call out the same dimensions — all 29 sizes in our compiled tables match (pitch, s, m, e, dw, da, c, mw). ISO 4032:2023 is the current standard for hexagon regular nuts (style 1); DIN 934 is the legacy German designation. Specify ISO 4032 on new drawings; DIN 934 nuts are dimensionally interchangeable when the property class, finish and tolerance grade match.
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1. Dimensions at a glance
Key sizes — DIN 934 and ISO 4032 (identical values)| Size | Pitch (mm) | s — across flats (mm) | m — nut height (mm) | e — across corners (mm) |
|---|
| M6 | 1.0 | 10 | 5.2 | 11.05 |
| M8 | 1.25 | 13 | 6.8 | 14.38 |
| M10 | 1.5 | 16 | 8.4 | 17.77 |
| M12 | 1.75 | 18 | 10.8 | 20.03 |
| M16 | 2.0 | 24 | 14.8 | 26.75 |
| M20 | 2.5 | 30 | 18 | 32.95 |
Full tables for all sizes: ISO 4032 M1.6–M64 and DIN 934 M1.6–M64 on their standard pages.
2. What actually differs
- Standard status. DIN 934 is the legacy German designation; ISO 4032:2023 is the current international standard for hexagon regular nuts, style 1. DIN 934 still appears on older drawings and in component descriptions.
- Dimensions. Our compiled data shows all 29 sizes identical between the two standards — pitch, s (across flats), m (nut height), e (across corners), dw (bearing face), da and c. There is no M10 “17 vs 16” difference between DIN 934 and ISO 4032.
- Product grades. ISO 4032 defines product grades A and B (tolerance classes, not strength classes); check which grade the drawing or the customer requires. DIN 934 also uses product grades A and B.
- Property classes. Steel nuts are ordered to ISO 898-2 (classes 5, 6, 8, 10, 12); stainless nuts to ISO 3506-2 (A2/A4). The class and finish must be stated on the purchase order.
- Marking and documentation. Property-class marking, the manufacturer mark and the inspection certificate (EN 10204 3.1 / MTC) are separate requirements — do not assume they come with the standard number.
3. Which standard should I specify?
New drawings: ISO 4032:2023. Replacement / aftermarket: DIN 934 nuts are dimensionally interchangeable when the property class, finish and tolerance grade match. For thin lock nuts the equivalent pair is ISO 10511 and DIN 985 — a different product family.
4. Substitution checklist
- Read the drawing: DIN 934, ISO 4032, or dimensions only?
- Confirm the required product grade (A or B) and property class (5, 6, 8, 10, 12 / A2, A4).
- Confirm finish and coating class (zinc, HDG, zinc-nickel, dacromet).
- Confirm marking and documentation (property-class and manufacturer marks, MTC / EN 10204 3.1).
- On new drawings use ISO 4032:2023; keep DIN 934 as a note only if the customer requests it.
5. Frequently asked questions
Is DIN 934 the same as ISO 4032?
Dimensionally yes. In our compiled data all 29 sizes match size by size (P, c, da, dw, e, m, mw and s). DIN 934 is the legacy German designation; ISO 4032:2023 is the current international standard.
Can I use DIN 934 nuts instead of ISO 4032?
Yes when the dimensions match and the property class, finish and tolerance grade required by the drawing are met. Record the substitution on the inspection documents.
Is there an M10 across-flats difference between DIN 934 and ISO 4032?
No. Unlike DIN 931 vs ISO 4014 (partial-thread bolts), the DIN 934 and ISO 4032 nut tables match at M10 and at every other size in our compilation.
What property classes apply to ISO 4032 nuts?
Steel: ISO 898-2 classes 5, 6, 8, 10 and 12. Stainless: ISO 3506-2 A2/A4. The class is ordered separately from the standard number.
What is ISO 4032 “style 1”?
Style 1 is the standard-height hexagon regular nut (as opposed to style 2, the higher nut). ISO 4032 covers style 1; ISO 4033 covers style 2.
Data compiled by Longze QA from the published standard tables; last verified 2026-11-06. Informational only — the drawing and the purchase order govern the delivered part.