The UK’s offshore energy sector, extensive marine infrastructure, active construction market, and demanding industrial base create consistent demand for properly specified stainless steel fasteners. We Stainless Bolt Industries we are prominent manufacturer and supplier of SS hex bolts, stainless steel hex nuts, and SS screws in Grade 304 and Grade 316 to buyers across London, Aberdeen, Glasgow, Birmingham, and throughout the United Kingdom.
The UK fastener market is documentation-driven. Offshore oil and gas procurement in Aberdeen requires certified ASTM-standard materials with full traceability. Construction projects across England and Scotland increasingly specify SS 316 for coastal and marine-adjacent applications. The North Sea’s aggressive environment completely cold, high-salinity, high-pressure that means the grade selection in the UK’s energy sector isn’t a cost consideration; it’s a specification requirement.
We work with UK trading companies, engineering contractors, and offshore procurement teams. EN 10204 3.1 certificates, ASTM compliance, and supply chain documentation are standard with every order.
SS Hex Bolts in United Kingdom
Stainless steel hex bolts are used extensively across the UK’s construction, offshore, and industrial sectors. We supply Grade 304 and Grade 316 in metric and inch sizes for UK buyers.
SS hex bolts in the UK are specified for offshore platform structural connections, North Sea subsea installations, coastal and marine civil engineering, HVAC systems, structural steel in coastal buildings, and chemical plant assembly.
Grade 316 hex bolts are the standard for offshore and marine applications given the North Sea’s particularly aggressive chloride environment.
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Available Types:
- Fully threaded hex bolts
- Partially threaded hex bolts (hex cap screws)
- Heavy hex bolts for structural applications
Sizes Available: M6 to M100 | 1/4″ to 4″ in inch sizes
Standards: ASTM A193, DIN 933, DIN 931, ISO 4014, ISO 4017
SS Hex Nuts in United Kingdom
We supply SS hex nuts in matching 304 and 316 grades for consistent joint material throughout bolted connections.
In the UK, stainless steel hex nuts are used in offshore flanged pipework, marine superstructures, structural steel, and chemical and pharmaceutical plant assemblies.
Heavy hex nuts certified to ASTM A194 are a standard requirement for UK offshore procurement and are available from us with full MTCs.
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Available Types:
- Standard hex nuts (DIN 934 / ISO 4032)
- Heavy hex nuts (ASTM A194)
- Coupling nuts (extension nuts)
- Nylon insert lock nuts (SS hex nyloc)
- Flange nuts
Sizes Available: M4 to M100 | 1/4″ to 4″
Standards: ASTM A194 2H & 8M, DIN 934, ISO 4032
SS Screws in United Kingdom
Stainless steel screws cover the fastening requirements in sheet metal, enclosures, ductwork, modular construction, and light fabrication. We stock SS screws in 304 and 316 for UK buyers across standard head types and drive configurations.
In the UK, SS screws are used in commercial construction fit-outs, offshore module assembly, and food processing equipment in Scotland and Northern England, and outdoor electrical enclosures. Grade 316 self-tapping screws are the default for any UK coastal or offshore-adjacent application.
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Available Types:
- Self-tapping screws (pan head, countersunk, hex washer head)
- Machine screws (pan, CSK, round head — Phillips and slotted)
- Hex head self-drilling screws (tek screws)
- Socket cap screws (Allen screws)
- Set screws (grub screws)
Sizes Available: M3 to M20 | #6 to 3/4″ in inch series
Standards: DIN 7981, DIN 965, DIN 912, ISO 1481
SS 304 vs SS 316 Fasteners
| Feature | SS 304 Fasteners | SS 316 Fasteners |
| Composition | 18% Chromium, 8% Nickel | 16% Cr, 10% Ni, 2% Molybdenum |
| Corrosion Resistance | Good — handles most industrial environments | Excellent — resists chlorides and salt water |
| Marine Use | Not ideal near saltwater | Standard choice for marine/coastal use |
| Chemical Resistance | Moderate | Higher, due to molybdenum content |
| Temperature Performance | Up to ~870°C intermittent | Similar, with better pitting resistance |
| Cost | Lower | 20-30% higher than 304 typically |
For UK inland applications Birmingham’s manufacturing sector, London commercial construction, Midlands’s fabrication SS 304 works well and costs less. For Scotland’s offshore and coastal industrial base, coastal construction across England’s east and west coasts, and any marine application SS 316 is the correct grade. The North Sea’s chloride environment is among the most aggressive anywhere, and the cost premium for 316 is consistently justified by service life performance.
Applications of Stainless Steel Fasteners in UK
- Offshore Oil and Gas the North Sea showcase one of the world’s most demanding offshore environments. UK offshore procurement routinely specifies ASTM A193 B8M hex bolts and A194 8M nuts for topside structural connections, flanged piping, and process equipment. We supply with full EN 10204 3.1 MTCs and a lot traceability.
- Offshore Wind the UK has the world’s largest installed offshore wind capacity, with majority of projects in the North Sea and Irish Sea. Monopile and jacket foundations, transition pieces, and platform structures all it require certified Grade 316 fasteners for prolonged performance in marine environments.
- Construction and Infrastructure UK construction commercial towers, infrastructure projects, transport hubs that uses large volumes of structural hex bolts and nuts. Grade 304 covers most inland structural applications. Coastal and riverside construction increasingly specifies 316.
- Shipbuilding and Naval UK shipyards in Rosyth, Barrow-in-Furness, and Portsmouth work on naval vessels and commercial ships that require Grade 316 throughout marine-exposed structural and mechanical connections.
- Food and Beverage Processing Scotland’s whisky industry, along with food processing facilities across England and Wales, specifies SS 316 fasteners wherever chloride-based cleaning is part of routine operations.
- Pharmaceutical and Chemical the UK’s pharmaceutical manufacturing cluster and its chemical industry specify SS 316 for process equipment, reaction vessels, and pipework where hygiene standards and chemical exposure are ongoing requirements.
Why UK Buyers Source SS Fasteners from Stainless Bolt Industries
- EN 10204 3.1 MTCs as standard the documentation requirement for UK offshore, pharmaceutical, and food processing procurement.
- ASTM A193 B8M and A194 8M certified products for North Sea and offshore procurement requirements.
- Bulk dispatch to UK ports with export documentation aligned to UK post-Brexit customs requirements.
- Custom lengths and inch-series thread forms (UNC, UNF) available, which matter for UK projects bridging imperial and metric specifications.
- Stock depth on high-demand sizes in both grades prevents project delays.
- Competitive pricing for both spot orders and ongoing contract supply.
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Technical Specifications — SS Hex Bolts, Nuts & Screws
| Product | Grade 304 Standard | Grade 316 Standard |
|---|---|---|
| Hex Bolts | ASTM A193 B8 | ASTM A193 B8M |
| Hex Nuts | ASTM A194 8 | ASTM A194 8M |
| Screws | AISI 304 / DIN | AISI 316 / DIN |
Thread Standards:
- ISO Metric (coarse & fine pitch),
- Unified National Coarse (UNC),
- Unified National Fine (UNF), and
- BSW
Size Range:
- Hex Bolts: M6 to M100 (Metric) | 1/4″ to 4″ (Inch)
- Hex Nuts: M4 to M100 (Metric) | 1/4″ to 4″ (Inch)
- Screws: M3 to M20 (Metric) | #6 to 3/4″ (Inch)
Dimensional Standards:
- DIN 933 / DIN 931 (Hex Bolts),
- DIN 934 (Hex Nuts),
- DIN 912 / DIN 7981 / DIN 965 (Screws)
Surface Finish Options:
- Plain (mill finish)
- Passivated
- Electro polished (on request)
Mechanical Properties (ASTM A193 B8M —316 Grade):
- Min. Tensile Strength: 75 ksi (515 MPa)
- Min. Yield Strength: 30 ksi (205 MPa)
All products are available with EN 10204 3.1 MTCs, with lot traceability on request.
Frequently Asked Questions
North Sea offshore procurement typically specifies ASTM A193 B8M hex bolts and ASTM A194 8M hex nuts for flanged connections and structural uses. We do supply both grades with EN 10204 3.1 certificates and full lot traceability, the documentation baseline that UK offshore procurement teams require.
Yes. We do export to the UK with full documentation, EN 10204 3.1 MTCs, packing lists, and certificates of origin. Contact us with your specification and volume for a prompt quote.
Metric M6 to M100 and inch 1/4″ to 4″ in SS 304 and SS 316. We also supply UNC and UNF thread forms for projects using imperial specifications. Common sizes are stocked; non-standard lengths carry 2–4 week lead times.
ASTM A193/A194, DIN 933/934/912, and ISO standards depending on product type. EN 10204 3.1 MTCs are standard. Dimensional inspection reports on request.
Yes. We do supply Inch-series hex bolts and nuts in UNC and UNF thread forms and that are available in both SS 304 and SS 316. Send the spec, and we’ll confirm stock status or lead time.