18-8 Stainless Steel Fasteners Supplier
MT.BOLTS manufactures 18-8 stainless steel fasteners using high-quality austenitic stainless steel grades such as 304, 304L, and 302. These fasteners provide reliable corrosion resistance, good mechanical properties, and excellent weldability, making them suitable for a wide range of general-purpose and industrial applications. They perform well in mildly corrosive environments and are commonly used in construction, machinery, food processing, and automotive sectors.
Our 18-8 stainless steel fasteners are available in 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 A193, ASTM A276, ASTM A479 (304 / 304L / 302)
- Types: Bolts, Screws, Nuts, Washers, Studs
We regularly supply 18-8 stainless steel fasteners and bolts in the following grades: 304, 304L, and 302. Their chemical compositions and physical properties are summarized below for your procurement reference:
| Grade | UNS Number | Key Characteristics |
| 304 | S30400 | The most common 18-8 stainless steel; offers good corrosion resistance and strength. |
| 304L | S30403 | Low carbon version of 304; improved weldability and resistance to intergranular corrosion. |
| 302 | S30200 | Similar to 304 but with higher carbon content; slightly higher strength, slightly reduced corrosion resistance. |
18-8 Stainless Steel Fasteners Chemical Composition
| Element | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) |
| 304 | ≤ 0.08 | 18.0–20.0 | 8.0–10.5 | ≤ 2.0 | ≤ 1.0 | ≤ 0.045 | ≤ 0.030 |
| 304L | ≤ 0.03 | 18.0–20.0 | 8.0–12.0 | ≤ 2.0 | ≤ 1.0 | ≤ 0.045 | ≤ 0.030 |
| 302 | ≤ 0.15 | 17.0–19.0 | 8.0–10.0 | ≤ 2.0 | ≤ 1.0 | ≤ 0.045 | ≤ 0.030 |
18-8 Stainless Steel Fasteners Mechanical Properties
| Property | 304 / 304L / 302 Typical Values |
| Tensile Strength | 75,000 psi (515 MPa) to 85,000 psi (585 MPa) |
| Yield Strength | 30,000 psi (205 MPa) to 45,000 psi (310 MPa) |
| Elongation (%) | ≥ 40% |
| Hardness (HB) | ~201–217 |
| Temperature Range | -200°C to 870°C |
18-8 Stainless Steel Fasteners Types
MT.BOLTS offers a comprehensive range of 18-8 Stainless Steel Fasteners for your selection to meet various application requirements:
18-8 Stainless Steel Hex Head Lag Screws
18-8 Stainless Steel Curved Washers
18-8 Stainless Steel Wave Washers
18-8 Stainless Steel Belleville Washers
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Reasons to Choose 18-8 Stainless Steel Fasteners
- Excellent Corrosion Resistance
Performs well in most atmospheric conditions, fresh water, and mild chemical environments. - Good Mechanical Strength
Offers strong tensile and yield strength suitable for general structural and industrial use. - Non-Magnetic in Annealed Condition
Suitable for sensitive equipment and environments requiring low magnetic permeability. - Versatile and Cost-Effective
Combines reliable performance with competitive pricing, ideal for a wide range of applications. - Readily Available and Standardized
Conforms to widely accepted standards (ASME, ASTM, DIN), ensuring global compatibility and easy sourcing.
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Application of 18-8 Stainless Steel Fasteners
- Construction and Architecture
Used in structural frames, railings, supports, and external fittings due to their durability. - Food Processing Equipment
Safe for use in hygienic environments due to its corrosion resistance and non-toxicity. - Automotive and Machinery
Common in engine assemblies, body panels, and machinery frames. - Consumer Products
Found in appliances, electronics, and furniture requiring rust-resistant components. - General Industrial Use
Used in OEM manufacturing, repair/maintenance, and assembly across multiple sectors.
FAQ About 18-8 Stainless Steel Fasteners and Bolts
"18-8" refers to the composition—approximately 18% chromium and 8% nickel—a common grade of austenitic stainless steel, typically equivalent to 304.
Yes, 304 is the most common form of 18-8 stainless steel, though the term "18-8" can also broadly include similar alloys like 302 and 304L.
They are highly rust-resistant, but not completely rust-proof in extreme environments like saltwater or acidic exposure.
Yes, they are suitable for most outdoor applications unless exposed to marine or industrial pollution—where 316 would be preferred.
In the annealed condition, they are generally non-magnetic. Cold working (e.g., forming, threading) may induce slight magnetism.
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