Sri Lanka has a great combination of coastal geography, port that are linked with industrial activity, and steady construction growth that creates a consistent demand for appropriate quality of stainless steel fasteners. Here at Stainless Bolt Industries, we are leading manufacturer and supplier of  premium quality of SS hex bolts, stainless steel hex nuts, and SS screws in Grade 304 and Grade 316 to all the buyers residing in Colombo, Gampaha, Galle, and all other various locations of Sri Lanka.
As Sri Lanka is near to Indian Ocean, so it has active port infrastructure in Colombo, and expanding industrial zones along with western coast mean that corrosion-resistant fasteners aren’t optional they’re a crucial requirement for many projects.
Salt-laden coastal air accelerates fastener degradation quicker than most buyers expect, and the maintenance cost of replacing corroded fasteners during the mid-project is rarely worth the initial saving on cheaper alternatives.
We supply to trading houses, contractors, and manufacturers in Sri Lanka with documentation accuracy, competitive pricing, and export timelines that are aligned to Colombo port schedules.
SS Hex Bolts in Sri Lanka
Stainless steel hex bolts are used across Sri Lanka’s construction, marine, and industrial sectors. We supply them in Grade 304 and Grade 316 across metric and inch sizes for buyers in Colombo and throughout the island.
SS hex bolts in Sri Lanka are specified for port infrastructure, coastal building projects, marine superstructures, HVAC systems, and general industrial assemblies.
Grade 316 hex bolts are the standard choice for projects near the coast, given Sri Lanka’s high-humidity, salt-exposed environment along much of its coastline.
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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 Sri Lanka
We supply SS hex nuts in matching 304 and 316 grades, ensuring material consistency throughout the bolted joint.
In Sri Lanka, stainless steel hex nuts are used in port construction, boat building and repair, structural steel assemblies, food processing equipment, and process plant connections.
For flanged pipework in industrial applications, we can supply heavy hex nuts certified to ASTM A194 on request.
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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 Sri Lanka
Stainless steel screws cover the fastening requirements where hex bolts don’t fit sheet metal, enclosures, HVAC ductwork, panel installations, and light fabrication. We stock SS screws in 304 and 316 for Sri Lanka buyers across all standard head and drive configurations.
In Sri Lanka, SS screws are used in commercial building fit-outs, marine craft fitting, food processing equipment in Colombo’s industrial areas, and outdoor electrical enclosures. Grade 316 self-tapping screws are preferred for outdoor coastal applications where salt air is a constant factor.
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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 Sri Lanka’s inland projects manufacturing facilities away from the coast, commercial interiors, dry industrial environments SS 304 is cost-effective and performs well. For anything on or near the coast, in ports, on marine vessels, or in food processing facilities, SS 316 is the right call. Sri Lanka’s coastal humidity and salt exposure is consistent year-round, which means 316’s molybdenum content earns its cost every time.
Applications of Stainless Steel Fasteners in Sri Lanka
- Port and Marine Infrastructure Colombo’s expanding port infrastructure, fishing harbour facilities across the island, and coastal marine construction all require Grade 316 fasteners as a standard. The combination of seawater contact and salt air makes 304 unsuitable for most marine applications in Sri Lanka’s environment.
- Construction and Commercial Buildings Sri Lanka’s construction sector in the Colombo metropolitan area, along with tourist infrastructure in the southern and western coastal belt, uses large quantities of hex bolts and nuts. Grade 304 covers most structural applications in dry environments.
- Food Processing Sri Lanka’s tea industry processing facilities, as well as food and beverage manufacturers in the Western Province industrial zones, specify SS 316 fasteners for equipment that goes through routine chemical cleaning.
- HVAC and Electrical Sri Lanka’s commercial and residential development needs SS screws for ductwork, cable trays, panel boards, and mechanical rooms. SS 304 self-tapping screws handle the majority of this demand.
- Industrial and Manufacturing Export processing zones around Colombo, Biyagama, and Seethawaka include garment factories, light manufacturing, and industrial units which use SS fasteners in machinery maintenance and equipment assembly.
- Tourism and Hospitality Infrastructure Large number of hotel and resort projects along Sri Lanka’s southern and western coasts use SS 316 fasteners in outdoor fixtures, pool equipment, and coastal-facing structural elements.
Why Sri Lanka Buyers Source SS Fasteners from Stainless Bolt Industries
- EN 10204 3.1 mill test certificates are standard with every order a requirement that matters to Sri Lanka’s industrial and export-linked buyers.
- Stock depth on high-demand metric sizes means urgent orders for active projects get fulfilled without multi-week waits.
- Bulk dispatch to Colombo port with full export documentation, including commercial invoice, packing list, and certificates of origin.
- Custom lengths and thread forms available on request send the spec and we confirm lead time.
- Competitive pricing that reflects direct supply chain positioning, not middleman markups.
- Consistent supply for repeat buyers most of our Sri Lanka customers return because delivery reliability matches the pricing.
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
SS 316 is the standard for all marine and port applications in Sri Lanka. The island’s coastal environment means consistent salt air and humidity exposure, and 316’s molybdenum content handles that where 304 would begin to show surface corrosion within months. For submerged or splash-zone applications, some engineers specify 316L for better weld corrosion performance available on request.
Yes. We ship to Colombo with full export documentation EN 10204 3.1 MTCs, packing lists, and commercial invoices. Contact us with your spec and volume for a quote.
Metric M6 to M100 and inch 1/4″ to 4″, in both SS 304 and SS 316. Common sizes are held in stock. Non-standard lengths typically carry a 2–4 week lead time.
ASTM, DIN, and ISO standards depending on product type. EN 10204 3.1 MTCs as standard. Dimensional reports on request.
Yes. SS 316 self-tapping screws, machine screws, and hex head self-drilling screws are stocked. For outdoor coastal applications in Sri Lanka’s climate, 316 is the right baseline salt air exposure is consistent across most of the coastline.