What sizes and thread types are available for SS 316 fasteners?

We supply SS 316 fasteners in standard sizes from M2 to M110, with custom sizes available up to 6 inches or M160 and lengths up to 2000 mm. Thread options include Metric Coarse, Metric Fine, UNC, UNF, BSW, and BSF in both rolled and cut threads.

Stainless Steel 316 / 316L / 316H Fasteners

Q: Can SS 316 bolts be used in saltwater or marine environments?

Yes. The 2–3% molybdenum content in Stainless Steel 316 provides excellent resistance to chloride pitting and crevice corrosion, making SS 316 and 316L fasteners ideal for marine, offshore, coastal, and saltwater applications.

Q: What is the difference between 316 and 316L fasteners?

316L is the low-carbon version of 316 stainless steel, containing a maximum of 0.03% carbon compared to 0.08% for 316. The lower carbon content minimizes carbide precipitation during welding, improving corrosion resistance in welded structures. Both grades offer similar mechanical properties, although 316L has a slightly lower minimum yield strength.

Q: What is the maximum temperature for SS 316 fasteners?

SS 316 fasteners are suitable for continuous service temperatures up to approximately 870°C and intermittent service up to 925°C. For prolonged high-temperature applications, 316H is recommended, while 316Ti is preferred where resistance to sensitisation during welding is required.

Q: Which standards do 316 fasteners conform to?

Stainless Steel 316 fasteners are manufactured according to international standards including ASTM A193 B8M, ASTM A194 8M, ASME SA193, DIN 931, DIN 933, DIN 934, ISO 4014, ISO 4017, ISO 4032, as well as BS and IS specifications. Metric fasteners are commonly supplied in A4-70 and A4-80 property classes.

Q: Do you provide test certificates with SS 316 fasteners?

Yes. All Stainless Steel 316 fasteners are supplied with EN 10204 3.1 Mill Test Certificates as standard. EN 10204 3.2 certification and third-party inspection services are also available upon request.

Q: Is 316 stainless steel magnetic?

In the annealed condition, Stainless Steel 316 is essentially non-magnetic due to its austenitic structure. However, cold working processes such as thread rolling may produce slight magnetic properties without affecting its corrosion resistance or performance.

Manufacturer, Supplier & Exporter of UNS S31600 Bolts, Nuts, Studs, Screws & Washers

316 / 316L / 316H / 316Ti fasteners machined and thread-rolled to ISO 4014/4017/4032 tolerances built for marine, offshore, oil & gas and chemical-process duty. Full traceability with EN 10204 3.1 mill test certificates on every consignment.

Size Range: M2 – M110(custom to 6"/M160)

Standards: ASTM A193 / A194,ASME SA193, DIN, ISO, BS

Grades: 316 · 316L ·316H · 316Ti

Certification: EN 10204 3.1 / 3.2MTC + 3rd-party

Lead Time: Ready stock;export 2–3 weeks

Stainless Steel 316 / 316L / 316H Fasteners

Where corrosion, chlorides and corrosive chemicals pose a threat to the integrity of a bolted connection, all three of Stainless Steel 316 / 316L / 316H Fasteners are the trusted choice. SS 316 is an austenitic grade containing 2–3% molybdenum, which gives it markedly higher resistance to pitting and crevice corrosion than SS 304 (PREN ≈ 24–26 vs ≈ 18–20 for 304), which is what makes it the preferred alloy for marine hardware, offshore platforms, desalination plants, petrochemical units and pharmaceutical process lines. If you are looking for a complete range of 316-series fasteners, including hex bolts, heavy hex bolts, stud bolts, threaded rod, nuts, washers, socket cap screws and custom-machined parts, you can find all these at Unifit Fastener, available in the 316, 316L, 316H and 316Ti sub-grades. Each batch is manufactured from mill certified material, to ASTM A193/A194, DIN, ISO and BS standards, and supplied complete with EN 10204 3.1 mill test certificates. This guide provides the specifications, chemical composition, mechanical properties, dimensions, applications and buying answers to confidently specify SS 316 fasteners, whether you're looking for a single ready-stock size or a bulk order of fasteners in a custom thread form.

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Table of content

What Are Stainless Steel 316 Fasteners?
Technical Specification of Stainless Steel 316 / 316L / 316H Fasteners
SS 316 / 316L / 316H Fasteners Chemical Composition (% by weight)
Mechanical Properties of SS 316 / 316L / 316H Fasteners
SS 316 / 316L / 316H Fasteners Equivalent Grades & Standards
316 vs 316L vs 316H vs 316Ti: Which Grade Do You Need?
SS 316 / 316L / 316H Fasteners Types
Stainless Steel 316 Fasteners Applications
SS 304 vs SS 316 Fasteners Comparison
Dimensions, Weight & Torque Reference
Manufacturing, Quality & Certifications
Frequently Asked Questions

What Are Stainless Steel 316 Fasteners?

Stainless Steel 316 fasteners are threaded fastening components — bolts, nuts, studs, screws and washers — made from Type 316 austenitic stainless steel (UNS S31600). The grade’s defining feature is the addition of molybdenum on top of the chromium and nickel found in 304, which forms a more stable passive layer and resists chloride attack far better. This makes 316 fasteners the default specification for salt-water, coastal and chemical-exposure applications where ordinary carbon-steel or 304 hardware would corrode.

The 316 family includes four practical sub-grades, each tuned for a specific service condition:

SS 316: The standard grade — excellent all-round corrosion resistance and mechanical strength for general marine and chemical use.
SS 316L: Low-carbon (≤0.03% C) variant that resists carbide precipitation during welding, ideal for fabricated and welded assemblies.
SS 316H: Higher, controlled-carbon grade for enhanced creep and tensile strength at elevated temperatures.
SS 316Ti: Titanium-stabilised (DIN 1.4571) grade that protects against intergranular corrosion in the 425–815 °C sensitisation range.

Technical Specification of Stainless Steel 316 / 316L / 316H Fasteners

Parameter	Specification
Product Types	Hex bolts, heavy hex bolts, stud bolts, threaded rods, nuts, washers, screws, custom parts
Grades	316 / 316L / 316H / 316Ti
UNS Numbers	S31600 / S31603 / S31609 / S31635
Werkstoff (EN)	1.4401 / 1.4404 / 1.4436 / 1.4571
Size Range	M2 to M110 (custom up to 6" / M160)
Length	3 mm to 200 mm (custom up to 2000 mm)
Standards	ASTM A193 / A194, ASME SA193, DIN 931/933/934, ISO 4014/4017/4032, BS, IS
Thread Types	Metric coarse/fine, UNC, UNF, BSW, BSF; rolled or cut
Head Types	Hex, heavy hex, socket (cap/button/CSK), pan, truss, flange, carriage, eye, U
Surface Finish	Self-colour, passivated, electropolished, PTFE-coated, HDG, zinc-plated
Test Certificates	EN 10204 3.1 / 3.2, MTC, third-party inspection, IBR
Packaging	Anti-rust bags in cartons / wooden boxes / pallets, or per customer spec

SS 316 / 316L / 316H Fasteners Chemical Composition (% by weight)

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N	Ti
316	0.08	2.0	0.75	0.045	0.030	16.0–18.0	2.0–3.0	10.0–14.0	0.10	—
316L	0.03	2.0	0.75	0.045	0.030	16.0–18.0	2.0–3.0	10.0–14.0	0.10	—
316H	0.04–0.10	2.0	0.75	0.045	0.030	16.0–18.0	2.0–3.0	10.0–14.0	—	—
316Ti	0.08	2.0	0.75	0.045	0.030	16.0–18.0	2.0–3.0	10.0–14.0	—	5×C–0.70

Values are maximum unless a range is shown. Fe = balance. Molybdenum (2–3%) is the element that gives 316 its chloride resistance edge over 304.

Mechanical Properties of SS 316 / 316L / 316H Fasteners

Grade	Tensile Strength (MPa) min	Yield 0.2% Proof (MPa) min	Elongation in 50 mm (%) min	Hardness Rockwell B (HRB) max	Hardness Brinell (HB) max
316	515	205	40	95	217
316L	485	170	40	95	217
316H	515	205	40	95	217
316Ti	515	205	40	95	217

Physical Properties (typical, 316)

Property	Value
Density	8.0 g/cm³
Melting range	1371–1399 °C (≈2500–2550 °F)
Modulus of elasticity	193 GPa
Thermal conductivity (at 100 °C)	16.3 W/m·K
Mean thermal expansion (20–100 °C)	15.9 × 10⁻⁶ /K
Electrical resistivity	0.74 µΩ·m
Max continuous service temperature	≈ 870 °C intermittent, 925 °C continuous

SS 316 / 316L / 316H Fasteners Equivalent Grades & Standards

Grade	UNS (USA)	Werkstoff / EN (Germany)	BS (UK)	JIS (Japan)	AFNOR (France)
SS 316	S31600	1.4401	316S31	SUS 316	Z6CND17-11
SS 316L	S31603	1.4404	316S11	SUS 316L	Z2CND17-12
SS 316H	S31609	1.4436	316S51	—	—
SS 316Ti	S31635	1.4571	320S31	SUS 316Ti	Z6CNDT17-12

316 vs 316L vs 316H vs 316Ti: Which Grade Do You Need?

Feature	316	316L	316H	316Ti
Carbon content	≤ 0.08%	≤ 0.03%	0.04–0.10%	≤ 0.08% + Ti
Best for	General corrosion service	Welded / fabricated parts	High-temperature strength	Anti-sensitisation at 425–815 °C
Weldability	Good	Excellent	Good	Very good
High-temp creep strength	Standard	Lower	Highest	High
Typical use	Marine hardware	Chemical & food plant	Boiler / heat exchanger bolting	Exhaust & high-temp piping

SS 316 / 316L / 316H Fasteners Types

SS 316 / 316L / 316H Carriage Bolt

SS 316 / 316L / 316H Nuts

SS 316 / 316L / 316H Screw

SS 316 / 316L / 316H Stud Bolts

SS 316 / 316L / 316H Washers

SS 316 / 316L / 316H Fasteners

Stainless Steel 316 Fasteners Applications

Because SS 316 combines corrosion resistance with reliable strength, its fasteners are specified across the most demanding industrial sectors:

Marine & Offshore: boat fittings, docks, rigging, offshore platforms exposed to salt spray.
Oil, Gas & Petrochemical: flange bolting, pipeline supports, refinery structures.
Chemical Processing: reactors, heat exchangers, acid and chloride service.
Desalination & Water Treatment: RO skids, pumps and structural bolting in brine environments.
Pharmaceutical & Food: hygienic, easy-clean equipment and process lines.
Power, Nuclear & Aerospace: high-integrity bolting for critical assemblies.
Construction & Architecture: façades, railings and coastal structural steelwork.

SS 304 vs SS 316 Fasteners Comparison

Property	SS 304 Fasteners	SS 316 Fasteners
Molybdenum	None	2–3%
Chromium	18–20%	16–18%
Nickel	8–10.5%	10–14%
Chloride / pitting resistance	Moderate	Superior
Max service temperature	≈ 870 °C	≈ 925 °C
Tensile strength (min)	≈ 505 MPa	≈ 515 MPa
Relative cost	Lower	Higher
Best suited to	Kitchen, dairy, dry indoor	Marine, chemical, oil & gas, coastal

Rule of thumb: if the fastener will ever see salt, chlorides or aggressive chemicals, specify 316. For dry indoor or food-prep use where cost matters, 304 is usually sufficient.

Dimensions, Weight & Torque Reference

Recommended Tightening Torque — SS 316 (A4) Bolts, dry

Bolt Size	Torque (Nm)	Bolt Size	Torque (Nm)
M6	10.1	M16	195
M8	23	M20	385
M10	48	M24	660
M12	84	M30	1330
M14	133	M36	2320

Indicative dry-thread values for property-class A4-70. Always confirm against the joint design, lubrication factor (k) and applicable code before final torque-up.

Approx. Hex Bolt Weight (kg / piece)

Size	Weight (kg)	Size	Weight (kg)	Size	Weight (kg)
M12 × 40	0.053	M16 × 60	0.126	M20 × 80	0.260
M12 × 60	0.071	M16 × 100	0.186	M20 × 120	0.359
M12 × 100	0.107	M16 × 160	0.278	M24 × 100	0.456

Manufacturing, Quality & Certifications

Every Unifit Fastener order follows a controlled production and inspection route designed to remove doubt about what you are bolting with:

Raw-material verification: PMI and mill-certificate check against the specified UNS grade before machining.
Forming: hot forging, cold forging, CNC machining and thread rolling as suited to size and grade.
Heat treatment: solution annealing, stress relieving and stabilising for optimum corrosion and mechanical performance.
Testing: tensile, hardness, impact, PMI and 100% dimensional inspection; radiography on request.
Documentation: EN 10204 3.1 / 3.2 mill test certificates, third-party inspection and IBR certification available.

Quality management is aligned to ISO 9001, ISO 14001 and ISO 45001 (QMS / EMS / OHSAS) practices, giving procurement teams a documented, audit-ready supply chain.

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Frequently Asked Questions

Can SS 316 bolts be used in saltwater or marine environments?

Yes. The 2–3% molybdenum in 316 gives strong resistance to chloride pitting and crevice corrosion, making 316 (and 316L) the standard choice for boats, docks, coastal structures and offshore platforms exposed to salt spray.

What is the difference between 316 and 316L fasteners?

316L is the low-carbon version (≤0.03% C versus ≤0.08% for 316). The lower carbon prevents chromium-carbide precipitation during welding, so 316L is preferred for welded or fabricated assemblies where corrosion at the weld zone must be avoided. Mechanically they are very similar, with 316L having a slightly lower minimum yield strength.

What is the maximum temperature for SS 316 fasteners?

SS 316 is rated to about 870 °C in intermittent service and 925 °C in continuous service (avoid sustained use in the 425–860 °C sensitising range). For sustained high-temperature strength, choose 316H; to prevent sensitisation in the 425–815 °C range, choose the titanium-stabilised 316Ti (1.4571).

Which standards do 316 fasteners conform to?

Common specifications include ASTM A193 (B8M bolts), ASTM A194 (8M nuts), ASME SA193, DIN 931/933/934, ISO 4014/4017/4032, plus BS and IS standards. Property class A4-70 / A4-80 covers metric 316 fasteners.

Do you provide test certificates with SS 316 fasteners?

Yes. Every consignment ships with EN 10204 3.1 mill test certificates as standard; 3.2 certification and independent third-party inspection are available on request for critical applications.

What sizes and thread types are available?

Standard sizes run from M2 to M110, with custom manufacture up to 6"/M160 and lengths to 2000 mm. Metric coarse/fine, UNC, UNF, BSW and BSF threads are available in rolled or cut form.

Is 316 stainless steel magnetic?

In the annealed condition 316 is essentially non-magnetic. Cold working (such as thread rolling) can induce slight, localised magnetism, but it remains far less magnetic than martensitic or ferritic stainless grades.