Industries · Defence
Defence fasteners made to Def Stan 02-862
First Level and Non-First Level bolts, screws, studs, studbolts, nuts and washers for naval and defence equipment, machined in our Willenhall facility from certified bar, tested, marked and fully traceable.
First Level
Def Stan 02-862 Part 3 fasteners
SM1 to SM3
Carbon and low alloy grades, metric and unified
U3112
Our NATO supplier code (NCAGE)
3.1 / 3.2
EN 10204 certificates with full traceability
The standard
What Def Stan 02-862 covers
Def Stan 02-862 is the UK Ministry of Defence standard for threaded fasteners used in naval and defence equipment. HAGUE FASTENERS makes Def Stan 02-862 fasteners to drawing, from single replacements to batches of several hundred, with the testing, marking and paperwork each part of the standard asks for.
The standard comes in three parts. Part 1 guides material selection. Part 2 covers the procurement of Non-First Level fasteners. Part 3 covers the procurement of First Level fasteners: the highest integrity class, where the grade, the mechanical tests, the impact tests and the marking are all defined and must be proved.
Def Stan 02-862, Issue 3
- Part 1: material selection
- Part 2: procurement of Non-First Level fasteners
- Part 3: procurement of First Level fasteners
- Metric and unified threads
- Carbon and low alloy, stainless, duplex and non-ferrous grades
First Level grades
Carbon and low alloy steel: SM1, SM2 and SM3
Part 3 sets three submarine grades of carbon and low alloy steel fastener, each in metric and unified threads, covering bolts, screws, studs, studbolts and nuts. Prevailing torque nuts are available in SM1 grades only.
| Grade | Thread sizes | Finish | Service temperature |
|---|---|---|---|
| SM1-M (metric) | 6 mm to 48 mm | Zinc plated | Below 60°C |
| SM2-M (metric) | 6 mm to 48 mm | Unplated | Below 300°C |
| SM3-M (metric) | 6 mm to 48 mm | Unplated | 0°C to 520°C |
| SM1-U (unified) | 1/4 in to 2 in | Zinc plated | Below 60°C |
| SM2-U (unified) | 1/4 in to 2 in | Unplated | Below 300°C |
| SM3-U (unified) | 1/4 in to 2 in | Unplated | 0°C to 520°C |
Summary of Def Stan 02-862 Part 3 Issue 3, for guidance. We always work to the issue and requirements on your order.
Mechanical properties
What the SM grades must achieve
Charpy V-notch tests are to BS EN ISO 148-1. For SM1 and SM2 the average of three tests must exceed 50 J, with no single result below 35 J. We arrange the tensile, impact and hardness testing with independent UKAS-accredited laboratories and supply the reports with your parts.
| Grade and part | Yield (MPa min) | Tensile (MPa) | Elongation (% min) | Charpy impact |
|---|---|---|---|---|
| SM1 and SM2: bolts, screws, studs, studbolts | 680 | 850 to 1000 | 13 | 50 J average at 0°C |
| SM1 and SM2: nuts | 525 | 700 to 850 | 17 | 50 J average at 0°C |
| SM3: bolts, screws, studs, studbolts | BS EN 10269 grade 42CrMo5-6 or 40CrMoV4-6 | To BS EN 10269 | ||
| SM3: nuts | BS EN 10269 grade 21CrMoV5-7 | To BS EN 10269 |
Summary of Def Stan 02-862 Part 3 Issue 3, for guidance. We always work to the issue and requirements on your order.
Stainless, duplex and super austenitic
Corrosion resistant First Level grades
Austenitic stainless fasteners are made from grade A4 to BS EN ISO 3506, in property classes A4-50, A4-70 and A4-80. Duplex, super duplex and super austenitic fasteners are made from bar to BS EN 10088, with the mechanical and impact properties below measured on longitudinal test pieces.
| Material | Grade | 0.2% proof (MPa min) | Tensile (MPa) | Elongation (% min) | Impact (J min) |
|---|---|---|---|---|---|
| Duplex | 1.4462 | 450 | 650 to 880 | 25 | 100 |
| Super duplex | 1.4501 | 530 | 730 to 930 | 25 | 100 |
| Super austenitic | 1.4547 | 300 | 650 to 850 | 35 | 100 |
| Super austenitic | 1.4652 | 430 | 750 to 1000 | 40 | 100 |
Summary of Def Stan 02-862 Part 3 Issue 3, for guidance. We always work to the issue and requirements on your order.
Non-ferrous
Nickel alloys, bronzes, titanium and aluminium
For non-magnetic, seawater and high strength duty, Part 3 lists nickel alloys, bronzes, titanium and aluminium, each with its own material standard, condition and minimum proof stress, tensile strength and elongation by size. We hold certified bar in many of these grades, so urgent orders can start straight away.
| Material | Material standard | Marking (metric / unified) |
|---|---|---|
| Alloy 400 (NA13) | BS 3076-NA13 | SM / NA13, SU / NA13 |
| Alloy K-500 (NA18) | BS 3076-NA18 | SM / NA18, SU / NA18 |
| Nickel aluminium bronze | Def Stan 02-833 Part 2 | SM / NAB, SU / NAB |
| High strength CNM alloy | Def Stan 02-835 | SM / CNM, SU / CNM |
| Aluminium alloy | BS EN 755 6082-T6 | SM / AL, SU / AL |
| Titanium | ASTM B348, ASTM F467 and F468 | SM / TI, SU / TI |
| Alloy 625 (NA21) | BS 3076-NA21 | SM / 625, SU / 625 |
| Alloy 718 (2.4668) | BS EN 10302 | SM / 718, SU / 718 |
| Alloy 686 (UNS N06686) | ASTM F468 (M) / B574 | SM / 686, SU / 686 |
| Alloy 725 (UNS N07725) | ASTM B805 | SM / 725, SU / 725 |
Summary of Def Stan 02-862 Part 3 Issue 3, for guidance. We always work to the issue and requirements on your order. Washers use the same materials, with plate and sheet standards where applicable.
Identification
First Level marking you can trace
Every First Level fastener carries its grade symbol and a batch identity, so each part can be matched to its material certificate, heat treatment and test results even after it has been fitted. Metric parts are marked SM and unified parts SU.
We hard-stamp or laser-mark the identity on each part, and for SM1 grades it is applied before zinc plating, as the standard requires.
- Carbon and low alloy: SM1-M, SM2-M, SM3-M or SM1-U, SM2-U, SM3-U
- Austenitic stainless: A4/50, A4/70 or A4/80 followed by SM or SU
- Duplex, super duplex, super austenitic: DSS, SDSS or SASS followed by SM or SU
- Non-ferrous: SM or SU with the alloy symbol, for example SM / NA13 or SU / 718
How we supply
From order review to certified release
Def Stan work is about proof as much as machining. Every order is reviewed against the part of the standard, the issue and the drawing before we cut any metal, and the evidence is collected as the work goes through.
01
Contract review
We check the Def Stan part and issue, grade, size, finish, tests, marking and documents called up on your order and drawing.
02
Certified material
Bar from approved UK, EU and US mills, with the heat number recorded and carried through every stage.
03
Manufacture
CNC turning, milling and threading in our own Willenhall facility, with heat treatment and plating by audited partners.
04
Testing
Tensile, Charpy impact, hardness and chemical analysis by independent UKAS-accredited laboratories, as the grade requires.
05
Marking and release
Grade symbol and batch identity on each part, then release with EN 10204 3.1 or 3.2 certificates and test reports.
What we make
Defence fasteners and machined parts
Studbolts
Allthread and double-ended studs in SM grades, stainless and nickel alloys.
Hexagon bolts
Bolts and screws to drawing, metric or unified.
Nuts
Hex nuts and prevailing torque nuts, matched to the bolt grade.
Bronze and nickel alloy parts
Nickel aluminium bronze, Alloy 400, K-500, 625 and 718.
Socket screws
Cap, shoulder and countersunk screws in special grades.
Washers
Plain and machined washers in matching materials.
Questions
Frequently asked questions
What is a First Level fastener?
A fastener in the highest integrity class of Def Stan 02-862, bought to Part 3. Its grade, mechanical and impact tests, marking and documentation are all defined by the standard and must be proved for every batch.
What is the difference between Part 2 and Part 3?
Part 2 covers the procurement of Non-First Level fasteners, and Part 3 covers First Level fasteners, which carry tighter requirements for testing, identification and traceability. Part 1 helps select the material.
Can you make nickel aluminium bronze fasteners to Def Stan 02-833?
Yes. We machine nickel aluminium bronze bolts, studs and nuts, and other non-ferrous grades such as Alloy 400, K-500, 625 and 718, from certified bar.
Do you mark the fasteners?
Yes. First Level parts carry the grade symbol and a batch identity, hard-stamped or laser-marked. SM1 parts are marked before zinc plating.
Do you make unified (inch) sizes as well as metric?
Yes. We make SM1-U, SM2-U and SM3-U and the other unified grades, from 1/4 in to 2 in and beyond to drawing.
Can you supply small quantities?
Yes. From a single replacement to batches of several hundred, with the same testing and documentation.
Defence enquiry?
Send your drawing, Def Stan part and grade
Tell us the quantity, grade, thread, finish and documents you need and we will come back to you quickly. Your drawings and data are held on IT systems certified to Cyber Essentials, and handled under our information security and classified information policies.