Stainless Steel Fasteners Manufacturers in India
Unifit Fastener is a trusted manufacturer and supplier of premium stainless steel fasteners in India, serving diverse industries across global markets. We have a wide variety of stainless steel bolts, stainless steel nuts, stainless steel screws, stainless steel studs, stainless steel washers, and tailor-made fasteners, which are designed to last and to perform.
Our stainless steel accessories are produced in modern and highly advanced factories with up-to-date machines, high-level testing systems, and high-quality control methods. This guarantees that all products are of international standards like DIN, ANSI, ASTM, and JIS, which is to offer accuracy, strength, and long-term performance.
We also focus on the austenitic stainless steel fasteners and provide an entire range of such products produced in common forms like Stainless Steel 304/304L,310/310S, 316/316L,317/317L, 321,and 347/347H. These high-grade fasteners are developed to operate well in any harsh environment, such as high-temperature settings, chemical exposure areas, marine life, and heavy structural works.
Our backward integration manufacturing strategy will give us the ability to maintain quality throughout all batches, and our stringent quality inspection will make sure every fastener is of the precise technical specifications of our clients. Nowadays we have a broad variety of SKUs that number in the thousands, and Unifit Fastener is a company of choice among industrial organizations in India and the rest of the world.
At Unifit Fastener, we remain committed to delivering precision-engineered, high-performance stainless steel fasteners that meet evolving industrial needs with reliability and excellence.
Request QuoteTable of Contents
- What are Stainless Steel Fasteners?
- Specification of Stainless Steel Fasteners
- Send Your Enquiry
- Types of Stainless Steel Fasteners
- Equivalents Standards of Stainless Fasteners
- Chemical Composition of SS Fasteners
- Thread Pitch Comparison SS Fasteners
- Metric to Imperial Stainless Steel Fastener Conversion Chart
- Applications of Stainless Steel Fasteners
- FAQs about Stainless Steel Fasteners
What are Stainless Steel Fasteners?
Stainless steel fasteners are metals like nuts, bolts, screws, and washers that are designed using corrosion-resistant iron alloy. They have a high concentration of chromium and thus form a protective layer that eliminates rusting. This gives them a sure way to use them in the high-demand environment in terms of exposure to moisture, chemicals, and extreme temperatures and can be found in marine, automotive, construction, and industrial use.
Grades of Stainless Steel Fasteners
Specification of Stainless Steel Fasteners
Largest Industrial SS Fasteners Manufacturers in India in Various Grades and Types
| Category | Details |
|---|---|
| Standard Sizes | Imperial: 3/6" to 2" Metric: M3 – M56 Length: 3–200 mm |
| Bolts Thread | UNC, BSW, METRIC, UNF, BSF etc. |
| Studs End | Sheared, Chamfer, Flat, Rounded, Saw Cut |
| Screws Head Shapes | Round, Pan, Button, Truss |
| Threaded Rod Thread | Right Hand, Left Hand, Both Right & Left |
| Physical Properties (Hex Bolts) | Density: 7.9 g/cm³ Melting Point: 1400–1450 °C Temperature Range: ~500 J/kg·K |
| Standards (Anchor Fasteners) | ASTM: A193 ASME: SA193 ISO: 3506 |
| Bolts Neck Types | Knurled, Square, Hex, Triangular |
| Stud Types | Double-End, Fine/Fully Threaded, Tap-End |
| Process (Hex Head Bolts) | Hot Forging, Cold Forging, CNC Machined |
| Surface Finish (Nuts) | Phosphating, Oxidation, HDG |
| Screw Tip Style | Rolled, Dog, Die, A Pinch |
| Screw Thread Pitch | Coarse Threads, Fine Threads |
| Threaded Rod Condition | Threading, Cold Drawn |
| Applications | Construction, Marine Industry, Petrochemical Plants, Automotive |
| Origin | Japanese, Indian, Korean, European, American |
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Types of Stainless Steel Fasteners
Manufacturer of Stainless Steel Fasteners in India in Various Types like Bolts, Nut, Screw, Stud Etc.
Stainless Steel Eye Bolts
Stainless Flange Bolts
SS Hanger Bolts
Stainless Steel Hex Head Bolts
Stainless J Bolts
SS Shoulder Bolts
Stainless Steel Square Head Bolts
Stainless U Bolts
Stainless Steel Cap Nuts
Stainless Castle Nuts
SS Coupling Nuts
Stainless Steel Heavy Hex Nuts
Stainless Hex Jam Nuts
SS Keps K Lock Nuts
Stainless Steel Stove Nuts
Stainless Wing Nuts
SS Eye Screws
Stainless Steel Hex Lag Screws
Stainless Machine Screws
SS Drywall Screws
Stainless Steel Self Drilling Screws
Stainless Socket Set Screws
SS Wood Screws
Stainless Threaded Cutting Screws
Stainless Steel Fender Washers
Stainless Flat Washers
SS Square Washers
Stainless Structural Washers
Equivalents Standards of Stainless Fasteners
| Standard | Werkstoff Nr. | UNS | EN | BS | JIS | GOST | AFNOR |
|---|---|---|---|---|---|---|---|
| SS 304 | 1.4301 | S30400 | X5CrNi18-10 | 304S31 | SUS 304 | 08Х18Н10 | Z7CN18-09 |
| SS 304L | 1.4306 / 1.4307 | S30403 | X2CrNi18-9 / X2CrNi19-11 | 3304S11 | SUS 304L | 03Х18Н11 | Z3CN18-10 |
| SS 304H | 1.4301 | S30409 | – | – | – | – | – |
| SS 310 | 1.4841 | S31000 | X15CrNi25-20 | 310S24 | SUS 310 | 20Ch25N20S2 | – |
| SS 310S | 1.4845 | S31008 | X8CrNi25-21 | 310S16 | SUS 310S | 20Ch23N18 | – |
| SS 316 | 1.4401 / 1.4436 | S31600 | X5CrNiMo17-12-2 / X3CrNiMo17-13-3 | 316S31 / 316S33 | SUS 316 | – | Z7CND17-11-02 |
| SS 316L | 1.4404 / 1.4435 | S31603 | X2CrNiMo17-12-2 / X2CrNiMo18-14-3 | 316S11 / 316S13 | SUS 316L | 03Ch17N14M3 / 03Ch17N14M2 | Z3CND17-11-02 / Z3CND18-14-03 |
| SS 316Ti | 1.4571 | S31635 | X6CrNiMoTi17-12-2 | 320S31 | SUS 316Ti | 08Ch17N13M2T | Z6CNDT17-123 |
| SS 317 | 1.4449 | S31700 | – | – | SUS 317 | – | – |
| SS 317L | 1.4438 | S31703 | X2CrNiMo18-15-4 | – | SUS 317L | – | – |
| SS 321 | 1.4541 | S32100 | X6CrNiTi18-10 | – | SUS 321 | – | – |
| SS 321H | 1.4878 | S32109 | X12CrNiTi18-9 | – | SUS 321H | – | – |
| SS 347 | 1.4550 | S34700 | X6CrNiNb18-10 | – | SUS 347 | 08Ch18N12B | – |
| SS 410 | 1.4006 | S41000 | X12Cr13 | 410S21 | SUS 410 | – | – |
| SS 446 | 1.4762 | S44600 | – | – | – | – | – |
| SS 904L | 1.4539 | N08904 | X1NiCrMoCu25-20-5 | 904S13 | SUS 904L | STS 317J5 | Z2NCDU25-20 |
Chemical Composition of SS Fasteners
| Grade | P (%) | Mo (%) | C (%) | S (%) | Si (%) | Ni (%) | Cr (%) | Mn (%) |
|---|---|---|---|---|---|---|---|---|
| SS 304 | 0.045 max | — | 0.08 max | 0.03 max | 0.75 max | 8.00–10.50 | 18.00–20.00 | 2.00 max |
| SS 304L | 0.045 max | — | 0.03 max | 0.03 max | 0.75 max | 8.00–12.00 | 18.00–20.00 | 2.00 max |
| SS 304H | 0.045 max | — | 0.04–0.10 | 0.03 max | 1.00 max | 8.00–12.00 | 18.00–20.00 | 2.00 max |
| SS 310 | 0.045 max | — | 0.25 max | 0.03 max | 1.50 max | 19.00–22.00 | 24.00–26.00 | 2.00 max |
| SS 310S | 0.045 max | — | 0.08 max | 0.03 max | 1.50 max | 19.00–22.00 | 24.00–26.00 | 2.00 max |
| SS 316 | 0.045 max | 2.00–3.00 | 0.08 max | 0.03 max | 0.75 max | 10.00–14.00 | 16.00–18.00 | 2.00 max |
| SS 316L | 0.045 max | 2.00–3.00 | 0.03 max | 0.03 max | 0.75 max | 10.00–14.00 | 16.00–18.00 | 2.00 max |
| SS 316Ti | 0.045 max | 2.00–3.00 | 0.08 max | 0.03 max | 0.75 max | 10.00–14.00 | 16.00–18.00 | 2.00 max |
| SS 317 | 0.045 max | 3.00–4.00 | 0.10 max | 0.03 max | 1.00 max | 11.00–15.00 | 18.00–20.00 | 2.00 max |
| SS 317L | 0.045 max | 3.00–4.00 | 0.03 max | 0.03 max | 1.00 max | 11.00–15.00 | 18.00–20.00 | 2.00 max |
| SS 321 | 0.045 max | — | 0.08 max | 0.03 max | 1.00 max | 9.00–12.00 | 17.00–19.00 | 2.00 max |
| SS 321H | 0.045 max | — | 0.04–0.10 | 0.03 max | 1.00 max | 9.00–12.00 | 17.00–19.00 | 2.00 max |
| SS 347 | 0.045 max | — | 0.08 max | 0.03 max | 1.00 max | 9.00–13.00 | 17.00–19.00 | 2.00 max |
| SS 410 | 0.04 max | — | 0.15 max | 0.03 max | 1.00 max | — | 11.50–13.50 | 1.00 max |
| SS 446 | 0.04 max | — | 0.20 max | 0.03 max | 1.00 max | — | 23.00–28.00 | 1.50 max |
| SS 904L | 0.045 max | 4.00–5.00 | 0.02 max | 0.03 max | 1.00 max | 24.00–26.00 | 1 |
Thread Pitch Comparison SS Fasteners
| Metric Thread Size | Nearest Imperial Thread Match | Thread Pitch (TPI – Threads per Inch) | Thread Pitch (mm) |
|---|---|---|---|
| M3 | #4-40 | 40 | 0.5 |
| M4 | #6-32 | 32 | 0.7 |
| M5 | #10-24 | 24 | 0.8 |
| M6 | 1/4"-20 | 20 | 1.0 |
| M8 | 5/16"-18 | 18 | 1.25 |
| M10 | 3/8"-16 | 16 | 1.5 |
| M12 | 1/2"-13 | 13 | 1.75 |
| M16 | 5/8"-11 | 11 | 2.0 |
| M20 | 3/4"-10 | 10 | 2.5 |
| M24 | 7/8"-9 | 9 | 3.0 |
Metric to Imperial Stainless Steel Fastener Conversion Chart
| Metric Size (MM) | Nearest Imperial Equivalent | Thread Diameter (Inches) | Thread Diameter (MM) |
|---|---|---|---|
| M3 | 1/8" | 0.125 | 3 |
| M4 | 5/32" | 0.156 | 4 |
| M5 | 3/16" | 0.188 | 5 |
| M6 | 1/4" | 0.250 | 6 |
| M8 | 5/16" | 0.313 | 8 |
| M10 | 3/8" | 0.375 | 10 |
| M11 | 7/16" | 0.438 | 11 |
| M12 | 1/2" | 0.500 | 12 |
| M14 | 9/16" | 0.563 | 14 |
| M16 | 5/8" | 0.625 | 16 |
| M20 | 3/4" | 0.750 | 20 |
| M22 | 7/8" | 0.875 | 22 |
| M24 | 1" | 1.000 | 24 |
| M30 | 1 1/8" | 1.125 | 30 |
| M32 | 1 1/4" | 1.250 | 32 |
| M35 | 1 3/8" | 1.375 | 35 |
| M38 | 1 1/2" | 1.500 | 38 |
Applications of Stainless Steel Fasteners
- Construction and infrastructure projects
- Oil & gas, petrochemical, and chemical processing
- Marine and offshore structures
- Food processing and pharmaceutical industries
- Automotive and heavy engineering
- Renewable energy (solar, wind, hydro)
- Electrical & instrumentation installations
- Water treatment plants and pipelines
- Industrial machinery and equipment assemblies
FAQs about Stainless Steel Fasteners
What are stainless steel fasteners used for?
Stainless steel fasteners, such as bolts, nuts, screws, washers, and studs, are used to securely join components in industries like marine, construction, automotive, petrochemical, food processing, and renewable energy. Their corrosion resistance, strength, and durability make them ideal for harsh environments where ordinary steel would fail.
Can stainless steel fasteners be welded or brazed?
Yes, stainless steel fasteners can be welded or brazed, depending on the grade and application. Austenitic grades like 304 and 316 are easier to weld using TIG, MIG, or resistance methods, with precautions such as preheating and post-weld passivation to maintain corrosion resistance. Brazing is also possible using compatible filler metals for a strong, leak-free joint.
What are the strongest types of fasteners?
The strength of a fastener depends on its material, grade, and design. High-strength stainless steel (Grades 316, 317, 904L), alloy steel (Grades 8, 10.9, 12.9), and super duplex or Inconel fasteners are among the strongest, offering excellent corrosion resistance, high tensile strength, and reliability in heavy-load, high-pressure, and harsh environments.