Hexagon nuts machined to order to the dimensional requirements of ISO 4032 (regular, style 1), ISO 4035 (thin) or BS 3692 where specified, in nickel aluminium bronze (CuAl10Ni5Fe4 — CW307G / CA104) and aluminium silicon bronze (CuAl6Si2Fe — CW301G / CA107) to the applicable drawing or material specification. M4 to M64 metric; 1/4" upward in UNC and UNF. Supplied with material certification and, where specified, to NES 833 / DEF STAN 02-833 for NAB, NES 834 / DEF STAN 02-834 Pt 2 (superseded by 02-879 Pt 2 Annex D, Sept 2011) for SAB, and the DEF STAN 02-862 Part 2 manufacturing route.
Nuts are machined from certified hexagon or round bar with machined threads — the route DEF STAN 02-862 Part 2 permits for these alloys; the standard requires machined thread forms. Usually ordered with the matching bolts or studs, but supplied separately against drawing just as readily. No minimum order quantity.
ISO 4032 is the regular hexagon nut, style 1; ISO 4035 the thin (half) nut, style 0. Across flats is common to both. Across flats and nut heights are the maximum values (s max, m max) from the standards. In ISO 4032 the main table runs M5–M39; M4 and sizes above M39 are covered by its Annex A.
| Thread | Pitch (mm) | Across flats s (mm) | ISO 4032 height m (mm) | ISO 4035 height m (mm) |
|---|---|---|---|---|
| M4 | 0.7 | 7 | 3.2 | 2.2 |
| M5 | 0.8 | 8 | 4.7 | 2.7 |
| M6 | 1.0 | 10 | 5.2 | 3.2 |
| M8 | 1.25 | 13 | 6.8 | 4.0 |
| M10 | 1.5 | 16 | 8.4 | 5.0 |
| M12 | 1.75 | 18 | 10.8 | 6.0 |
| M14 | 2.0 | 21 | 12.8 | 7.0 |
| M16 | 2.0 | 24 | 14.8 | 8.0 |
| M18 | 2.5 | 27 | 15.8 | 9.0 |
| M20 | 2.5 | 30 | 18.0 | 10.0 |
| M22 | 2.5 | 34 | 19.4 | 11.0 |
| M24 | 3.0 | 36 | 21.5 | 12.0 |
| M27 | 3.0 | 41 | 23.8 | 13.5 |
| M30 | 3.5 | 46 | 25.6 | 15.0 |
| M33 | 3.5 | 50 | 28.7 | 16.5 |
| M36 | 4.0 | 55 | 31.0 | 18.0 |
| M39 | 4.0 | 60 | 33.4 | 19.5 |
| M42 | 4.5 | 65 | 34.0 | 21.0 |
| M45 | 4.5 | 70 | 36.0 | 22.5 |
| M48 | 5.0 | 75 | 38.0 | 24.0 |
| M52 | 5.0 | 80 | 42.0 | 26.0 |
| M56 | 5.5 | 85 | 45.0 | 28.0 |
| M60 | 5.5 | 90 | 48.0 | 30.0 |
| M64 | 6.0 | 95 | 51.0 | 32.0 |
Dimensional product grade A or B where applicable; bronze material and mechanical requirements are governed separately by the drawing and material specification. Non-standard heights, reduced or oversize across-flats, left-hand threads, imperial and specials to drawing — see Made to Drawing.
CuAl10Ni5Fe4. The higher-strength alloy, with excellent seawater, erosion and cavitation resistance; commonly specified for structural and immersed fastenings. Naval material standard NES 833 / DEF STAN 02-833 Part 2. Relative magnetic permeability typically around 1.4–1.5. Full data, designations and cross-references on the NAB material page.
CuAl6Si2Fe. Good machinability, ductile, and formulated for controlled low magnetic permeability — relative magnetic permeability not exceeding 1.05 (DEF STAN 02-879 Part 2 Annex D, D.2.8; batch-tested to D.4.5) — used for mine countermeasures vessels and other naval low-signature applications. Tighter permeability limits are a drawing or contract requirement and are handled at enquiry stage. Naval material standard NES 834 / DEF STAN 02-834 Part 2, subsequently incorporated into DEF STAN 02-879 Part 2 Annex D. Full data on the SAB material page.
Source-material certification supplied as standard, with traceability to the bar heat maintained through manufacture. Where the drawing calls for DEF STAN 02-862 Part 2, nuts are machined from bar with machined threads and post-machining stress relief per clause 8.2.4 (NAB) or 8.2.5 (SAB), with heat treatment and stress relief records supplied where required by the drawing, specification or purchase order. Marking, EN 10204 3.1 certification, dimensional inspection reports and CoC as required by the order; EN 10204 3.2 where agreed in advance and supported by the material source and inspection arrangements.
The drawing and specification govern. Alloy designations above are cross-references, not statements of equivalence.
Non-standard heights, oversize across-flats, castle or slotted, left-hand or imperial — send the drawing and we'll quote within 24 hours.
Send us your drawing or spec reference and we'll come back with a price and lead time. No minimum order quantity.