First Level Fasteners – Manufactured to the Highest Standard
- Dan Pearce
- Feb 3
- 3 min read
In critical engineering environments, reliability is non-negotiable. For bolted joints used in the most safety-sensitive locations, the UK Ministry of Defence applies a specific standard: DEF STAN 02-862 Part 3, covering the procurement and assurance of First Level fasteners.
At Energy Bolting, we are proud to manufacture to this standard—delivering fasteners that meet the most stringent expectations for material integrity, process control, and full traceability.
What Are First Level Fasteners?
According to the MOD’s definition within SSP 25 and referenced in DEF STAN 02-862, First Level fasteners are those used in areas, systems, equipment, or components where failure could result in loss of the platform or containment of fission products.
This critical classification demands an elevated level of assurance. As a result, First Level fasteners are subject to:
Material traceability and full documentation
Enhanced non-destructive and mechanical testing
Strict manufacturing, heat treatment and inspection procedures
Certification to BS EN 10204 Type 3.1 or 3.2 as contractually required
Manufactured in Compliance with DEF STAN 02-862 Part 3
Energy Bolting manufactures First Level fasteners in accordance with the latest issue of DEF STAN 02-862 Part 3, covering both metric and unified thread series.
We supply the full range of submarine-grade carbon and alloy steel fasteners as defined in the standard:
SM1 – For zinc-plated fasteners used below 60°C
SM2 – For unplated fasteners used below 300°C
SM3 – For unplated fasteners used between 0°C and 520°C
All fasteners are produced from heat-treated bar stock which is ultrasonically tested, magnetically particle examined, and chemically analysed in accordance with the standard. Test samples from each batch undergo:
Tensile and proof load testing
Charpy V-notch impact testing
Hardness testing
Dimensional and thread inspection
Surface examination
Each product is supported by a complete documentation pack including raw material certificates, inspection reports, test results, and certificate of conformity.
Additional Material Capabilities
In addition to the SM-series carbon and alloy steel fasteners, Energy Bolting also manufactures to related MOD requirements covering:
Austenitic, duplex and super duplex stainless steels
Nickel-based alloys such as Monel® and Inconel®
Copper alloys including nickel-aluminium bronze (DEF STAN 02-833)
Titanium and other non-ferrous grades specified in naval applications
Our production is supported by UKAS-accredited laboratories and an approved supply chain that ensures conformance with all relevant MOD and ISO standards.
Typical First Level Fastener Requirements include:
Studbolts, Engineer Studs, Hex Nuts, Nyloc Nuts , Washers & Machined Components to customer drawings
Why Defence Contractors Engage Energy Bolting
✅ Manufactured to DEF STAN 02-862 Part 3 Issue 3
✅ Full compliance with UK MOD traceability and documentation requirements
✅ Internal and third-party test capabilities to BS EN 10204 3.1 & 3.2
✅ Material grades supplied to MOD-recognised standards
✅ Fast response and batch control for urgent or ongoing programme needs
Energy Bolting’s fasteners are built to satisfy the highest expectations for critical performance and regulatory compliance.
Whether your requirement is for batch production or a made-to-drawing special, our team has the technical and operational capability to deliver.
Speak to Our Technical Team
If you require First Level fasteners compliant with MOD specifications, we invite you to speak with us. Our engineering and quality assurance teams are experienced in supporting projects with demanding material, inspection and documentation requirements.
Send your enquiries for a prompt and competitive quotation
📞 +44 (0) 1902 509000
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Energy Bolting – First Level Fastener Manufacturer
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Information is provided for general guidance only and may be updated without notice. Energy Bolting Limited accepts no liability for reliance on this content. Always refer to the latest official standards and specifications before making technical or procurement decisions.
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