Stainless Steel Fasteners Supplier
MT.BOLTS manufactures stainless steel fasteners using corrosion-resistant austenitic stainless steel grades such as 304, 304L, 309, 310S, 314, 316, 316L, 316Ti, 317L, 321, and 347. These stainless steel fasteners are ideal for applications requiring high corrosion resistance, heat resistance, and mechanical durability. They are widely used in petrochemical facilities, food processing, marine hardware, power generation, and heat exchangers.
Our stainless steel fasteners have the following specifications:
- Diameter: M3 to M64 | #4 to 2.5″
- Length: 6mm to 500mm | 0.25″ to 20″
- Thread Pitch: Metric (Coarse/Fine) | UNC/UNF
- Standards: ASME B18.2.1, ASME B18.3, ASME B18.2.2, DIN/ISO/EN (e.g., DIN 933, DIN 934)
- Material Specifications: ASTM A182, ASTM A479, ASTM A276 (304 / 304L / 309 / 310S / 314 / 316 / 316L / 316Ti / 317L / 321 / 347)
- Types: Bolts, Screws, Nuts, Washers, Studs
We regularly supply stainless steel fasteners and bolts in the following grades: 304, 304L, 309, 310S, 314, 316, 316L, 316Ti, 317L, 321, and 347. Their chemical compositions and physical properties are provided below for your procurement reference.
| Grade | UNS Number | Key Characteristics |
| 304 | S30400 | Most common stainless steel; excellent corrosion resistance and formability. |
| 304L | S30403 | Low carbon version of 304; better weldability and reduced risk of intergranular corrosion. |
| 309 | S30900 | Higher chromium and nickel; better resistance to high temperatures. |
| 310S | S31008 | Superior high-temperature oxidation resistance; low carbon content. |
| 314 | S31400 | Excellent heat resistance and scaling resistance; high chromium and nickel. |
| 316 | S31600 | Better corrosion resistance than 304; especially against chlorides. |
| 316L | S31603 | Low carbon version of 316; improved weldability and reduced sensitization. |
| 316Ti | S31635 | Titanium-stabilized 316; good resistance to intergranular corrosion after welding. |
| 317L | S31703 | Higher molybdenum content; superior resistance to pitting and crevice corrosion. |
| 321 | S32100 | Titanium-stabilized 304; excellent resistance to intergranular corrosion. |
| 347 | S34700 | Niobium-stabilized 304; good for high-temperature and welding applications. |
Stainless Steel Chemical Composition
| Grade | C | Cr | Ni | Mo | Mn | Si | N | Other Elements |
| 304 | ≤0.08 | 18.0–20.0 | 8.0–11.0 | — | ≤2.0 | ≤1.0 | ≤0.10 | — |
| 304L | ≤0.03 | 18.0–20.0 | 8.0–12.0 | — | ≤2.0 | ≤1.0 | ≤0.10 | — |
| 309 | ≤0.20 | 22.0–24.0 | 12.0–15.0 | — | ≤2.0 | ≤1.0 | — | — |
| 310S | ≤0.08 | 24.0–26.0 | 19.0–22.0 | — | ≤2.0 | ≤1.5 | — | Low carbon version of 310 |
| 314 | ≤0.25 | 23.0–26.0 | 19.0–22.0 | — | ≤2.0 | 1.5–3.0 | — | Al: 0.25–0.75 |
| 316 | ≤0.08 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤2.0 | ≤1.0 | ≤0.10 | — |
| 316L | ≤0.03 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤2.0 | ≤1.0 | ≤0.10 | — |
| 316Ti | ≤0.08 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤2.0 | ≤1.0 | ≤0.10 | Ti: ≥5×C, ≤0.7% |
| 317L | ≤0.03 | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | ≤2.0 | ≤1.0 | ≤0.10 | — |
| 321 | ≤0.08 | 17.0–19.0 | 9.0–12.0 | — | ≤2.0 | ≤1.0 | — | Ti: ≥5×C, ≤0.7% |
| 347 | ≤0.08 | 17.0–19.0 | 9.0–13.0 | — | ≤2.0 | ≤1.0 | — | Nb + Ta: ≥10×C, ≤1.0% |
Stainless Steel Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) |
| 304 | ≥515 | ≥205 | ≥40 | ≤95 |
| 304L | ≥485 | ≥170 | ≥40 | ≤90 |
| 309 | ≥620 | ≥310 | ≥40 | ≤95 |
| 310S | ≥520 | ≥205 | ≥40 | ≤95 |
| 314 | ≥600 | ≥310 | ≥40 | ≤100 |
| 316 | ≥515 | ≥205 | ≥40 | ≤95 |
| 316L | ≥485 | ≥170 | ≥40 | ≤90 |
| 316Ti | ≥515 | ≥205 | ≥40 | ≤95 |
| 317L | ≥515 | ≥205 | ≥35 | ≤95 |
| 321 | ≥515 | ≥205 | ≥40 | ≤95 |
| 347 | ≥515 | ≥205 | ≥40 | ≤95 |
Note: Values are typical for annealed condition per ASTM A240/A276/A479 and may vary depending on form and heat treatment.
Stainless Steel Fastener Types
MT.BOLTS offers a comprehensive range of Stainless Steel Fasteners for your selection to meet various application requirements:
Stainless Steel Hex Head Screw Bolts
Stainless Steel Square Head Bolts
Stainless Steel Flange Bolts
Stainless Steel Serrated Flange Bolts
Stainless Steel Eye bolts
Stainless Steel Carriage Bolts
Stainless Steel Elevator Bolts
Stainless Steel U-Bolts
Stainless Steel Anchor Bolts
Stainless Steel Expansion Bolt
Stainless Steel Lag Bolts
Stainless Steel U-Bolts
Stainless Steel Hex Head Lag Screws
Stainless Steel Shoulder Screws
Stainless Steel Socket Cap Screws
Stainless Steel Self-Tapping Screws
Stainless Steel Hex Nuts
Stainless Steel Serrated Flange Nuts
Stainless Steel Lock Nuts
Stainless Steel Wing Nuts
Stainless Steel Coupling Nut
Stainless Steel Square Nuts
Stainless Steel Acorn Nuts
Stainless Steel Wing Nuts
Stainless Steel Fully Threaded Rods & Studs
Stainless Steel Equal Thread Length Rods & Studs
Stainless Steel Unequal Thread Length Rods & Studs
Stainless Steel Single End Threaded Studs
Stainless Steel Weld Studs
Stainless Steel Press-In Captive Studs
Stainless Steel Flat Washers
Stainless Steel Lock Washers
Stainless Steel Curved Washers
Stainless Steel Wave Washers
Stainless Steel Square Washers
Stainless Steel Belleville Washers
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Reasons to Choose Stainless Steel Fasteners
Stainless steel fasteners are widely chosen for their exceptional corrosion resistance, high strength, and durability in harsh environments. They perform reliably across a broad temperature range, require minimal maintenance, and offer a clean, attractive appearance suitable for functional and decorative applications. With a wide selection of grades such as 304, 316, and 321, stainless steel fasteners meet diverse mechanical and environmental demands, making them a sustainable and cost-effective solution for long-term use.
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Application of Stainless Steel Fasteners
- Marine & Offshore – Boats, docks, offshore platforms
- Construction & Architecture – Structural supports, handrails, curtain walls
- Chemical & Petrochemical Plants – Piping systems, reactors
- Food & Beverage Industry – Sanitary equipment, processing machinery
- Pharmaceutical & Medical – Cleanroom equipment, surgical instruments
- Automotive & Aerospace – Engine parts, exhaust systems
- Power Generation – Turbines, heat exchangers, nuclear facilities
- Home Appliances & Consumer Goods – Electronics, kitchenware
FAQ About Stainless Steel Fasteners and Bolts
316 contains molybdenum, offering better resistance to chlorides and chemicals compared to 304.
While highly corrosion-resistant, stainless steel can rust under extreme or improperly maintained conditions, especially if exposed to salt or chemicals.
Austenitic grades like 304 and 316 are generally non-magnetic, but cold working may introduce slight magnetism.
Yes, but galvanic corrosion may occur in moist environments. Use insulating washers or coatings when necessary.
Common standards include ASTM A193, ASTM A276, ASTM A479, ASME B18.2.1, B18.3, DIN 933, DIN 934, ISO, and EN.
Yes, especially low-carbon grades like 304L or 316L are suitable for welding with minimal risk of sensitization.
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