ISO 4775 Hexagon Nuts with Large Widths Across Flats
ISO 4775 hexagon nuts with large widths across flats for high-strength (overhead line) connections M12 to M36 — the wide-hex heavy nut with the collected dw/e/m/m'/s rows and per-1000 weight.
Last updated: 2026-11
Specifications
ISO 4775 is the heavy nut for connections where bearing pressure, not just thread strength, decides the joint: widths across flats a size larger than the standard hex (s 22 at M12 up to 60 at M36 — on the M36 the standard hex would be 55), giving a bigger bearing face dw (20 → 57) that spreads preload into softer members without local crushing. The standard serves high-strength bolting for transmission lines and heavy electrical connections (the source titles it for high-voltage connections), and pairs with the wide-hex heavy bolts this catalog carries under the HV structural line. The collected rows: pitch P, dw Min. (20 → 57), across-corners e Min. (23,91 → 66,44), height m (Nominal size = max. 10 → 29 / Min. 9,64 → 27,7), wrench height m' Min. (7,71 → 22,16), width across flats s (Nominal size = max. 22 → 60 / Min. 21,16 → 58,8) and the source's own weight row (23,3 → 515 kg per 1000 pcs). Property class — these nuts pair with high-strength bolts, commonly class 8/10 — and finish are not tabulated by the collected specification — per RFQ.
| Standard | ISO 4775 — hexagon nuts with large widths across flats (high-strength / overhead-line connections) |
|---|---|
| Size range | M12 – M36 in the collected ladder |
| Wide hex | s nominal=max. 22 → 60 mm — a size above the standard hex (M36: 60 vs 55) |
| Bearing face | dw Min. 20 → 57; e Min. 23,91 → 66,44 |
| Height | m nominal=max. 10 → 29 (Min. 9,64 → 27,7); m' Min. 7,71 → 22,16 |
| Weight | kg/1000 pcs: 23,3 (M12) → 515 (M36), the source's own row |
| Material / class / finish | Not tabulated by the collected specification — per RFQ |
| thread size d | M12 | M16 | M20 | M22 | M24 | M27 | M30 | M36 | |
|---|---|---|---|---|---|---|---|---|---|
| P | 1,75 | 2 | 2,5 | 2,5 | 3 | 3 | 3,5 | 4 | |
| dw | Min. | 20 | 25 | 30 | 34 | 39 | 43,5 | 47,5 | 57 |
| e | Min. | 23,91 | 29,56 | 35,03 | 39,55 | 45,2 | 50,85 | 55,37 | 66,44 |
| m | Nominal size = max. | 10 | 13 | 16 | 18 | 19 | 22 | 24 | 29 |
| Min. | 9,64 | 12,3 | 14,9 | 16,9 | 17,7 | 20,7 | 22,7 | 27,7 | |
| m´ | Min. | 7,71 | 9,84 | 11,92 | 13,52 | 14,16 | 16,56 | 18,16 | 22,16 |
| s | Nominal size = max. | 22 | 27 | 32 | 36 | 41 | 46 | 50 | 60 |
| Min. | 21,16 | 26,16 | 31 | 35 | 40 | 45 | 49 | 58,8 | |
| Weight kg/1000pcs | 23,3 | 44,8 | 73,9 | 104 | 155 | 224 | 300 | 515 |
Materials
- Property class and finish specified per RFQ — these wide-hex nuts pair with high-strength structural bolts (commonly class 8/10); state the bolt standard and galvanizing requirement at quotation, since hot-dip galvanized threads need the oversized tapping the class calls out
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (ISO 4775 Hexagon Nuts with Large Widths Across Flats) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
Why does a high-strength connection need a wider nut (ISO 4775) instead of a standard hex nut?
Bearing stress. Thread strength scales with the nut's height; bearing stress scales with the annular face area. On a high-strength bolt running near yield preload, a standard hex face can crush into softer members — timber connectors, aluminium busbars, cast flanges — and the lost clamp reads as joint relaxation. The wide hex buys face area: the collected rows show s 22 at M12 vs the standard 18, and 60 at M36 vs 55, with dw Min. growing 20 → 57 across the ladder. That is why transmission-line and heavy electrical specs name this standard (the source titles it for high-voltage connections) rather than ISO 4032. The weight row (23,3 → 515 kg/1000) is worth checking before you order by the pallet — these are heavy nuts. Class, material and finish per RFQ; the pairing rule is to match the nut class to the bolt class, never lower, and to tell us at quotation if the joint is galvanized so the tapping allowance follows.
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support