Made-to-order aluminium silicon bronze (SAB) fasteners to NES 834. Material to NES 834 / DEF STAN 02-834 Pt 2 (superseded by 02-879 Pt 2 Annex D, Sept 2011) as called up. Manufacture and post-machining to DEF STAN 02-862 Part 2 Para 8.2.5 where specified. Material certification and batch traceability with every order; heat treatment records where specified. No minimum order quantity.
NES 834 — Naval Engineering Standard 834 — is the Royal Navy material standard for aluminium silicon bronze (SAB). It is the SAB counterpart to NES 833, which covers nickel aluminium bronze (NAB). Where your drawing calls out NES 834, the specified material is aluminium silicon bronze, not NAB. It was succeeded by DEF STAN 02-834 Part 2, which was itself superseded by DEF STAN 02-879 Part 2 Annex D in September 2011.
Material heat treatment to control microstructure is governed by the material standard (DEF STAN 02-833 for NAB; DEF STAN 02-834 Pt 2, superseded by 02-879 Pt 2 Annex D in Sept 2011, for SAB). DEF STAN 02-862 Part 2 Para 8.2.4 (NAB) / 8.2.5 (SAB) defines the manufacturing and post-machining route for finished non-First Level fasteners, including stress relief where required. We supply to whichever the drawing calls up. DEF STAN 02-862 Part 2 covers Non-First Level fasteners; Part 3 covers First Level. Time-temperature records are supplied where heat treatment is specified.
SAB offers excellent machinability alongside good corrosion resistance in seawater — and it is suited to applications where tight tolerances or complex fastener geometries are required. It has low magnetic permeability and is well-suited to high-load bolted connections in marine applications.
If your drawing references both NES 833 and NES 834, it is specifying two different materials — NAB and SAB respectively. We can supply both on the same order with the appropriate certification for each.
Material heat treatment is governed by the material standard — DEF STAN 02-834 Pt 2 (superseded by 02-879 Pt 2 Annex D, Sept 2011). Where the drawing calls up DEF STAN 02-862 Part 2 Para 8.2.5, the manufacturing and post-machining route for finished non-First Level fasteners — including stress relief where required — is followed. Here's what gets documented.
Where the drawing specifies heat treatment, SAB is heat treated to the material standard. Where DEF STAN 02-862 Part 2 Para 8.2.5 is called up, the post-machining route including stress relief is followed. Furnace temperature, hold time and cooling are recorded throughout.
Heat treatment carried out by approved UK processors. Batch records retained and linked to the fastener lot.
Post heat treatment tensile and hardness testing confirms the material meets NES 834 mechanical property requirements.
Time-temperature charts, test results, and conformance declaration compiled into the cert pack that ships with the fasteners.
All SAB fasteners sourced to order to NES 834. Manufacture and post-machining to DEF STAN 02-862 Part 2 Para 8.2.5 where specified. Full cert pack included.
ISO 4014 / ISO 4017, BS 3692; legacy DIN 931 / 933.
M4–M64
ISO 4032 regular, ISO 4035 thin; legacy DIN 934. All-metal locking forms to ISO 7042 / 7719 / 10513 within each standard's own size range; other sizes to drawing and qualification review.
M4–M64
BS 4439 studs, BS 4882 studbolt forms, engineering studs, DIN 976 threaded bar.
M8–M52 subject to review
ISO 7089 / 7090 normal series; legacy BS 4320 A / B / C where specified; large series to ISO 7093-1 or legacy DIN 9021; spring and specials to drawing.
M4–M64
ISO 4762 cap, DIN 7984 low head, ISO 10642 CSK, ISO 4026–4029 grub.
M3–M36 overall, each form within its standard's range
Slotted countersunk, pan and cheese to ISO 2009 / 1580 / 1207 or BS 4183.
M2–M10
UNC, UNF, BSW, BSF and BA for legacy and US-origin equipment.
1/4"–2"
Specials, obsolete drawings and one-offs — subject to specification and manufacturing review.
Send your drawing
This is what ships with every NES 834 SAB order. Everything your QA team and prime contractor need.
Full heat treatment chart where heat treatment is specified — temperature profile, hold times, and cooling rate — including stress relief under DEF STAN 02-862 Part 2 Para 8.2.5 where called up.
Mill certificate showing chemical composition and mechanical properties to the specification ordered, supplied as standard.
Material heat number, heat treatment batch, and fastener batch all linked. Traceable from raw material to finished fastener.
Signed supplier declaration confirming supply to NES 834 SAB and manufacture and post-machining to DEF STAN 02-862 Part 2 Para 8.2.5 where specified.
Send us your drawing or spec reference. We'll confirm the heat treatment records the drawing requires and come back with a price and lead time.
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