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ISO 9001:2015 - PED 2014/68/EU - AD 2000 W2 - Third-party inspection by SGS, TUV & Bureau Veritas
15+ years manufacturing - 3,000+ nut variants - 40+ export markets
Unifit Fastener manufactures SS 316 and 316L nuts to ASTM A194 Grade 8M, ASME SA194, DIN and BS, in sizes from M3 to M100. We cold-forge below M24 and hot-forge above it, then tap, passivate and proof-load test each lot before it ships. The 2-3% molybdenum in 316 is what separates these nuts from 304: it lifts the pitting resistance number (PREN) from roughly 18 to roughly 24, which is why 316 and 316L are specified for seawater, de-icing salt and chlorinated process media. Choose 316L where the nut sits in or beside a weld - its <= 0.030% carbon resists sensitisation. Every lot ships with an EN 10204 3.1 Mill Test Certificate traceable to the heat number; 3.2 third-party inspection through SGS, TUV or Bureau Veritas is available on request. Trial batches start at 5 pieces; container loads dispatch from Nhava Sheva.
Request a QuoteStainless Steel 316 and 316L nuts are austenitic fasteners alloyed with 2-3% molybdenum, which dramatically improves resistance to chloride pitting and crevice corrosion compared to 304-grade stainless. Grade 316L is the low-carbon variant (0.03% max carbon versus 0.08% in 316), making it the preferred option for welded assemblies since it resists carbide precipitation and intergranular corrosion during and after welding. Unifit Fastener manufactures both grades across hex, square, dome, flange, coupling, lock, and eye-nut configurations, forged or cold-formed to ASTM, DIN, ISO, and JIS dimensional standards.
| Parameter | Specification |
|---|---|
| Grade | Stainless Steel 316 (UNS S31600) / Stainless Steel 316L (UNS S31603) |
| Governing Standards | ASTM A194, ASME SA194, DIN, ISO, BS |
| Size Range | M2 - M100 | 3/16" - 4" (custom sizes available on request) |
| Nut Height (m) | DIN 934 / ISO 4032 - Heavy Hex Nuts to ASME B18.2.2 - Jam & Thin Nuts to DIN 439 / ISO 4035 |
| Thread Type | Metric Coarse & Fine (ISO 261/262), UNC, UNF, BSW, BSF |
| Form | Hex, Heavy Hex, Square, Round, Flanged, Jam, Thin Nuts (as per drawing/specification) |
| Production Process | Cold Forging (M2-M24) and Hot Forging (M24-M100) / CNC Machining for special sizes |
| Surface Finish | Bright, Passivated, Bright Zinc Plated (BZP), Hot-Dip Galvanized, PTFE Coated |
| Property Class | A4-70 / A4-80 (ISO 3506-2) - ASTM A194 Grade 8M / 8MA |
| Test Certification | EN 10204 3.1 Mill Test Certificate (MTC) - ASTM & ASME Dual Certified - PMI Test Report on Request |
| MOQ | 5 Pieces (Trial Orders Accepted) - Bulk & FCL Pricing Available on Request |
| HSN Code & Tax | HSN Code: 7318.16.00 - GST: 18% (India) - RoDTEP Eligible for Export Orders |
| Standard | Werkstoff Nr. | UNS | JIS | BS | EN |
|---|---|---|---|---|---|
| SS 316 | 1.4401 / 1.4436 | S31600 | SUS 316 | 316S31 | X5CrNiMo17-12-2 |
| SS 316L | 1.4404 / 1.4435 | S31603 | SUS 316L | 316S11 | X2CrNiMo17-12-2 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
|---|---|---|---|---|---|---|---|---|---|
| SS 316 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.0-18.0 | 2.0-3.0 | 10.0-14.0 | Balance |
| SS 316L | 0.030 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.0-18.0 | 2.0-3.0 | 10.0-14.0 | Balance |
"Composition limits per ASTM A276 / A479 (bar). Nuts machined from plate-derived stock are certified to ASTM A240, where silicon is limited to 0.75% max." - this pre-empts the discrepancy between this page (Si 1.0) and the SS 316 washers page (Si 0.75).
| Property | Specification |
|---|---|
| Property Class | A4-70 (Standard) - A4-80 (High Strength, Available on Request) |
| Proof Load Stress (ISO 3506-2) | A4-70: 700 MPa - A4-80: 800 MPa |
| Proof Load Stress (ASTM A194 Grade 8M) | 80,000 psi (552 MPa) |
| Hardness (ASTM A194 Grade 8M) | 126-300 HB (Maximum 32 HRC) |
| Density | 8.0 g/cm3 |
| Melting Range | 1,375-1,400 C (2,507-2,552 F) |
| Material Properties - SS 316 (Annealed Bar, ASTM A276) | Tensile Strength: 515 MPa - Yield Strength (0.2% Offset): 205 MPa - Elongation: 40% Minimum |
| Material Properties - SS 316L (Annealed Bar, ASTM A276) | Tensile Strength: 485 MPa - Yield Strength (0.2% Offset): 170 MPa - Elongation: 40% Minimum |
| Size | Finished Hex | Heavy Hex | Finished Jam | Heavy Jam | Square |
|---|---|---|---|---|---|
| 1/2" | 3.75 | 6.54 | 2.62 | 4.00 | 5.78 |
| 3/4" | 11.9 | 19.3 | 7.70 | 11.0 | 15.4 |
| 1" | 28.3 | 42.5 | 17.6 | 23.5 | 36.3 |
| 1-1/2" | 94.3 | 131 | 60.9 | 74.8 | 94.5 |
| 2" | 224 | 299 | 140 | 165 | - |
| Property | SS 304 | SS 316 | SS 316L |
|---|---|---|---|
| Molybdenum Content | None | 2.0-3.0% | 2.0-3.0% |
| Carbon Content | 0.08% max | 0.08% max | 0.030% max |
| Chloride/Corrosion Resistance | Moderate | High | High |
| Weldability | Good | Good | Excellent |
| Best Use Case | General indoor use | Marine, chemical exposure | Welded marine/chemical assemblies |
| Relative Cost | Lowest | Higher | Highest |
| Standard | Description / Equivalent Standard |
|---|---|
| ASTM A194 Grade 8M / 8MA | Standard specification for stainless steel nuts used in high-pressure and high-temperature bolting applications |
| ISO 3506-2 | Mechanical property standard for corrosion-resistant stainless steel nuts (Property Classes A4-70 and A4-80) |
| DIN 934 | Hexagon Nuts - ISO 4032 / EN ISO 4032 |
| DIN 936 | Thin Hexagon Nuts (Metric Fine Thread) - ISO 8675 |
| DIN 439 | Thin Hexagon Nuts (Metric Coarse Thread) - ISO 4035 |
| DIN 555 | Hexagon Nuts, Product Grade C - ISO 4034 |
| DIN 557 | Square Nuts - No direct ISO equivalent (Square weld nuts: DIN 928; Hex weld nuts: DIN 929) |
| DIN 562 | Thin Square Nuts - No direct ISO equivalent |
| DIN 582 | Eye Nuts - No direct ISO equivalent |
| DIN 1587 | Domed Cap Nuts - No direct ISO equivalent |
| DIN 6923 | Hex Flange Nuts - ISO 4161 |
| DIN 985 | Nylon Insert Lock Nuts - ISO 10511 |
| DIN 315 | Wing Nuts - No direct ISO equivalent (Verify ISO reference if specifically required) |
The price of Stainless Steel 316/316L Nuts depends on factors such as size, thread type, standard, quantity, and surface finish. We supply high-quality SS 316 and 316L Nuts manufactured in accordance with IS, DIN, ISO, and ASTM standards at competitive prices across India and international markets.
To get the latest Stainless Steel 316/316L Nuts price list, bulk order discounts, or a customized quotation, call us at +91 22 66518521 or email us at chirag@unifitmetalloys.com.
| Thread Size | Across Flats (mm) | Thickness (mm) | Approx. Weight (g/pc) | Approx. Weight (kg/100 pcs) |
|---|---|---|---|---|
| M6 | 10 | 5 | 2.5 | 0.25 |
| M8 | 13 | 6.5 | 5.1 | 0.51 |
| M10 | 17 | 8 | 10.6 | 1.06 |
| M12 | 19 | 10 | 17.0 | 1.70 |
| M14 | 22 | 11 | 27.0 | 2.70 |
| M16 | 24 | 13 | 37.5 | 3.75 |
| M18 | 27 | 15 | 54.0 | 5.40 |
| M20 | 30 | 16 | 73.0 | 7.30 |
| M22 | 32 | 18 | 97.0 | 9.70 |
| M24 | 36 | 19 | 122.0 | 12.20 |
| M27 | 41 | 22 | 173.0 | 17.30 |
| M30 | 46 | 24 | 235.0 | 23.50 |
| M33 | 50 | 26 | 320.0 | 32.00 |
| M36 | 55 | 29 | 410.0 | 41.00 |
| M39 | 60 | 31 | 540.0 | 54.00 |
| M42 | 65 | 34 | 675.0 | 67.50 |
| M48 | 75 | 38 | 980.0 | 98.00 |
| M56 | 85 | 45 | 1,580.0 | 158.00 |
| M64 | 95 | 51 | 2,320.0 | 232.00 |
| DIN Standard | Equivalent Hexagon Nut Standard |
|---|---|
| DIN 934 | ISO 4032 |
| DIN 936 | ANSI B18.2.2 |
| DIN 985 | ISO 10511 (Nylon Insert Lock Nut) |
| DIN 6923 | ISO 4161 (Flange Nut) |
| DIN 1587 | ISO 4032 Domed Cap Nut Family |
Certifications maintained: ISO 9001:2015 Quality Management, PED 2014/68/EU, Merkblatt AD 2000 W2, and EN 10204 3.1/3.2 Test Certification. Documents provided include Mill Test Certificates, Chemical & Mechanical Test Reports, NABL-approved lab reports, and Third-Party Inspection Reports.
SS 316L has a maximum carbon content of 0.035% compared to 0.08% in standard SS 316. The lower carbon reduces the risk of carbide precipitation during welding, making 316L the preferred choice for welded assemblies exposed to corrosive environments.
Yes. The added molybdenum content gives SS 316/316L superior resistance to chloride pitting and crevice corrosion, making these grades a standard choice for marine, offshore, and coastal construction projects.
Yes, every shipment includes an EN 10204 3.1 Mill Test Certificate as standard, with 3.2 third-party certification available on request.
We offer PTFE, Xylan, zinc, phosphate, cadmium, and hot-dip galvanized coatings, along with passivation and electro-polishing finishes.
Yes, these grades retain useful mechanical properties at elevated temperatures and are commonly used in heat exchangers and thermal process equipment, though specific limits depend on load and exposure duration.