Hex head setscrews are the fully threaded form — "hexagon head screws" to ISO 4017 in DEF STAN 02-862 Table 8. Bolts are the part-threaded form to ISO 4014.
Hex head bolts and hex head setscrews machined to order to the dimensional requirements of ISO 4014 / ISO 4017, 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. Fully threaded (ISO 4017, legacy DIN 933) or partially threaded with a plain shank (ISO 4014, legacy DIN 931). Supplied with material certification and, where specified, to the naval material and fastener standards — NES 833 / DEF STAN 02-833 for NAB, NES 834 / DEF STAN 02-834 Pt 2 (superseded by 02-879 Pt 2 Annex D, Sept 2011) for SAB, and the DEF STAN 02-862 Part 2 manufacturing route.
Bolts and setscrews are machined from certified bar with machined thread forms. Machining from bar is one of the manufacturing routes permitted by DEF STAN 02-862 Part 2 for NAB and SAB; the Defence Standard requires machined thread forms for these alloys. No minimum order quantity.
Nominal values. ISO 4014 bolts and ISO 4017 screws share the same nominal hex-head dimensions. The principal difference is that ISO 4014 is a partially threaded bolt with a plain shank, whereas ISO 4017 is a fully threaded screw. Both standards' own material scope is primarily steel and stainless steel; DEF STAN 02-862 Part 2 calls up their dimensions for non-ferrous naval fasteners, and we manufacture NAB and SAB to those dimensions.
| Thread | Pitch (mm) | Across flats s (mm) | Head height k (mm) |
|---|---|---|---|
| M4 | 0.7 | 7 | 2.8 |
| M5 | 0.8 | 8 | 3.5 |
| M6 | 1.0 | 10 | 4.0 |
| M8 | 1.25 | 13 | 5.3 |
| M10 | 1.5 | 16 | 6.4 |
| M12 | 1.75 | 18 | 7.5 |
| M14 | 2.0 | 21 | 8.8 |
| M16 | 2.0 | 24 | 10.0 |
| M18 | 2.5 | 27 | 11.5 |
| M20 | 2.5 | 30 | 12.5 |
| M22 | 2.5 | 34 | 14.0 |
| M24 | 3.0 | 36 | 15.0 |
| M27 | 3.0 | 41 | 17.0 |
| M30 | 3.5 | 46 | 18.7 |
| M33 | 3.5 | 50 | 21.0 |
| M36 | 4.0 | 55 | 22.5 |
| M39 | 4.0 | 60 | 25.0 |
| M42 | 4.5 | 65 | 26.0 |
| M45 | 4.5 | 70 | 28.0 |
| M48 | 5.0 | 75 | 30.0 |
| M52 | 5.0 | 80 | 33.0 |
| M56 | 5.5 | 85 | 35.0 |
| M60 | 5.5 | 90 | 38.0 |
| M64 | 6.0 | 95 | 40.0 |
Product grade A or B per the standard; specials, non-standard lengths, reduced or oversize heads, drilled heads and imperial threads 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, bolts and setscrews 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 lengths, special heads, drilled for wire locking, left-hand or imperial threads — 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.