Turkey is one of the renowned manufacturing hub, its active shipbuilding industry, and its significant construction and infrastructure investment generate sustained demand for quality stainless steel fasteners. At Stainless Bolt Industries, we manufacture and supply SS hex bolts, stainless steel hex nuts, and SS screws in Grade 304 and Grade 316 to buyers in living in Istanbul, Izmir, Ankara, Bursa, and across various locations in Turkey.
Turkey’s fastener market is very sophisticated buyers here know the difference between certified material and uncertified, and they ask the right questions about standards and the documentation. The country’s shipyards on the Bosporus and in the Marmara and Aegean regions requires Grade 316 as a baseline for marine-exposed components. Petrochemical facilities in Izmir and the Marmara region, along with Turkey’s growing renewable energy segments, requires fasteners that meet ASTM and DIN specifications.
We work with Turkish trading companies, EPC contractors, and industrial buyers with documentation to EN 10204 3.1, along with export-ready packaging, and supply chain reliability that matches project schedules.
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 Bolts in Turkey
We supply stainless steel hex bolts in 304 and 316 grades, matched to the nuts and washers in the same joint no mixed materials across the assembly.
In Turkey, SS hex bolts are used in flanged pipework, ship construction and repair, structural steel, and process plant assemblies. For high-pressure or high-temperature service — petrochemical plants, refineries, energy installations we supply heavy hex bolts to ASTM A193 on request.
Available types:
- Hex bolts (DIN 933 / ISO 4017)
- Hex cap screws (DIN 931 / ISO 4014)
- Heavy hex bolts (ASTM A193)
- Stud bolts
- Double-ended studs
Sizes: M4 to M100 | 1/4″ to 4″ Standards: ASTM A193 B8 & B8M, DIN 931/933, ISO 4014/4017
SS Hex Nuts in Turkey
We supply stainless steel hex nuts in matching 304 and 316 grades for consistent material combinations throughout bolted joints.
In Turkey, SS hex nuts are used in flanged pipework, ship construction and repair, structural steel connections, and process plant assemblies. For high-pressure or high-temperature applications in Turkey’s petrochemical and energy sector, we supply heavy hex nuts certified to ASTM A194 on request.
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 Turkey
Stainless steel screws handle fastening in applications where hex bolts are impractical enclosures, sheet metal fabrication, HVAC ducting, and modular construction.
We stock SS screws in 304 and 316 for Turkey across all standard head types and drive configurations.
Turkey’s commercial construction sector, shipbuilding and repair yards, food processing industry, and export-oriented manufacturing all use SS screws regularly. Grade 316 self-tapping screws are specified wherever coastal or marine exposure is a factor.
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
Both grades are stainless, and both are corrosion resist but they are not interchangeable for every application.
| 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 |
Turkey’s inland industrial areas like Ankara, Bursa, and Kayseri generally work fine with SS 304 fasteners for non-corrosive environments. Turkey’s coastal industrial zones Istanbul’s Bosphorus-facing shipyards, Izmir’s petrochemical belt, the Marmara and Aegean coasts should default to SS 316 for anything exposed to salt air or seawater. Turkey’s shipbuilding industry almost uniformly specifies 316, which reflects the real-world performance difference in marine environments.
Applications of Stainless Steel Fasteners in Turkey
- Shipbuilding and Marine Turkey is among Europe’s leading shipbuilding nations, with major yards in Istanbul, Tuzla, Yalova, and Izmit. Ship construction requires Grade 316 hex bolts, nuts, and fasteners throughout exterior and marine-exposed structural elements. We supply certified material that meets the documentation requirements of Turkish classification society-registered projects.
- Petrochemical and Refining Turkey’s Tupras refinery network and petrochemical facilities around Izmir’s Aliaga industrial zone specify ASTM A193 B8M hex bolts and ASTM A194 8M nuts for flanged pressure connections. We supply both grades with full MTCs.
- Construction and Infrastructure Turkey’s sustained infrastructure investment bridges, metro expansions, airports, and mixed-use development across Istanbul and other major cities consumes significant volumes of structural hex bolts and nuts. Grade 304 handles most dry construction applications.
- HVAC and Electrical Commercial and residential construction across Turkey uses SS screws for ductwork, panel boards, and mechanical installations. Grade 304 self-tapping screws cover the bulk of this demand.
- Food Processing and Dairy Turkey’s substantial food processing sector dairy, packaged foods, meat processing specifies SS 316 fasteners in equipment that undergoes chemical cleaning with chloride-based agents.
- Energy and Renewables Turkey’s renewable energy expansion wind farms along the Aegean and Marmara coasts, solar installations, and hydroelectric uses stainless fasteners in outdoor and coastal-exposed structures. Grade 316 is the standard for coastal wind installations.
Why Turkey Buyers Source SS Fasteners from Stainless Bolt Industries
- EN 10204 3.1 MTCs as standard the documentation baseline for Turkish industrial and export-linked procurement.
- ASTM and DIN-certified products across both grades matching Turkey’s dual exposure to European and international project standards.
- Stock depth on fast-moving metric sizes in both 304 and 316, with bulk dispatch to Istanbul and Izmir ports.
- Custom lengths and thread forms (metric fine pitch, UNC) on request with confirmed lead times.
- Consistent pricing direct supply chain positioning without the premium layered in by intermediate traders.
- Export documentation aligned with Turkish customs requirements.
Technical Specifications
| 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
The difference between DIN 931 and ISO 4014 is DIN 931 is a German Standard, whereas ISO 404 is the international equivalent. DIN 931 is being replaced by ISO 4014 as it has more globally harmonized dimensions and tolerances.
Shipyards in Turkey typically specify Grade 316 for all marine-exposed structural connections. ASTM A193 B8M bolts and A194 8M nuts are the standard for flanged connections in engine rooms and process systems. We supply both with the classification society-accepted documentation that most Turkish yards require.
Yes. We ship to Istanbul and Izmir ports with full export documentation. Contact us with your spec and quantity for a quote.
Metric M6 to M100 and inch 1/4″ to 4″ in SS 304 and SS 316. Common metric sizes are in stock. Non-standard lengths carry 2–4 week lead times.
Yes. Hex bolts to DIN 933/931 and ASTM A193; hex nuts to DIN 934 and ASTM A194; screws to DIN 912, DIN 7981, and DIN 965. EN 10204 3.1 MTCs are standard with every order.
Yes. Non-standard lengths are available for most product types. Send the drawing or specification and we will confirm stock status or production lead time.