Made-to-order nickel aluminium bronze bolts, nuts and stud bolts to NES 833. Proven supply into UK Royal Navy surface ship programmes including Portsmouth Naval Base. Full material traceability and QA documentation as standard.
NES 833 — Naval Engineering Standard 833 — is a Royal Navy specification covering nickel aluminium bronze (NAB) wrought products used in naval vessels. It defines the material requirements, chemical composition, and mechanical properties for NAB in applications including fasteners, valve components, and propulsion hardware.
Originally written for Royal Navy use, NES 833 is still actively referenced on legacy surface ship drawings and refit programmes — particularly for vessels based at Portsmouth Naval Base. Where DEF STAN 02-833 is the current MOD-wide standard, NES 833 remains the specification of record on drawings produced before the transition.
For procurement engineers working on surface ship refit and maintenance, NES 833 is the spec they'll encounter most frequently. When a drawing calls it out, the fasteners must be sourced to that standard and supplied with the corresponding certification.
We have a proven track record supplying NAB fasteners to NES 833 into Royal Navy surface ship programmes through tier-one UK defence prime contractors.
Both cover nickel aluminium bronze — but they're used in different contexts. Here's what procurement engineers need to know.
| NES 833 | DEF STAN 02-833 | |
|---|---|---|
| Issued by | Royal Navy | UK Ministry of Defence |
| Scope | Royal Navy vessels | All UK defence applications |
| Status | Still active on legacy drawings | Current MOD standard |
| Where you'll see it | Surface ship refit, Portsmouth programmes | New build, submarines, broader defence |
| Material | Nickel Aluminium Bronze (NAB) | Nickel Aluminium Bronze (NAB) |
| Do we supply to it? | Yes — proven track record | Yes |
All fasteners sourced to order against your drawing or NES 833 specification. Supplied with full certification to satisfy Royal Navy and prime contractor QA requirements.
Full and part thread to ISO 4014, DIN 933, and customer drawings. Material cert to NES 833 included as standard.
M4 to M64 — larger on request
Standard, thick and thin hex nuts to ISO 4032 / DIN 934. Matched to bolt order or supplied separately against drawing.
M4 to M64 — all thread pitches
Double-ended studs for flanges, seawater valve assemblies, and naval piping systems. Supplied to your specified thread form and length.
M8 to M52 — any length
Countersunk, pan head, and cheese head machine screws to DIN 963, DIN 85, DIN 84, and customer drawings. Material cert to NES 833 included as standard.
M4 to M12 — larger on request
Socket heads, countersunk, UNC/UNF imperial thread, left-hand thread. If you have a drawing, we can quote it.
Metric & imperial — send your drawing
NES 833 requires full material traceability. Every order ships with the documentation your QA team and prime contractor need.
Chemical composition and mechanical properties verified to NES 833. Mill cert included as standard with every order.
Time-temperature records supplied where heat treatment is specified. NAB (NES 833) is heat treated to DEF STAN 02-862 Part 2 Para 8.2.4.
Every fastener traceable back to the original material heat. Batch records retained and available on request.
Declaration of conformance to NES 833, signed by our QA team — accepted by MOD prime contractors.
Send us your drawing or NES 833 reference and we'll come back with a price and lead time. No minimum order quantity.