Our A2-70 grade Stainless Steel 304 Hex Bolts deliver reliable corrosion resistance where regular fasteners fail. With 18-20% chromium and 8-10.5% nickel (per ASTM A276), they withstand salt spray for 96+ hours without red rust (per ASTM B117 testing).
The cold-forged hex heads provide 25% higher torque strength than machined alternatives - we've got third-party reports showing 700 MPa tensile strength (beating ISO 3506's 700 MPa minimum). For food plants or marine hardware, that means no galling or stress cracks even after 500+ tightening cycles. Compared to 316 SS, you'll save 40% per thousand pieces in non-chloride environments.
Every Stainless Steel 304 Hex Bolts gets precision treatment:
Cold-forged from Swiss-made wire (reduces machining stress risers)
Thread-rolled to ISO 898-1 Class 6g tolerance (smoother than cut threads)
Electrolytic passivation per ASTM A967 (free iron removal guaranteed)
100% magnetic permeability tested (<1.05 μ ensures no sensitization)
We add optional PTFE coating for galling prevention - saves installers snapped bolts on stainless-to-stainless connections.
Thread Type: Metric Coarse Thread (M), Unified Coarse Thread (UNC), Unified Fine Thread (UNF)
Processing Services: Custom Cutting, Thread Rolling, Heat Treatment, Surface Polishing, Non-Destructive Testing (NDT), Marking & Identification
Surface Treatment: Passivation, Electropolishing, Pickling, Spray Painting
Mechanical Properties: Tensile Strength: ≥520MPa,Yield Strength: ≥205MPa,Hardness: ≤201 HBW
Operating 12 automated lines with:
15 million-piece monthly capacity (handles big project rollouts)
We have our own metallurgical laboratory, which is ISO 17025 certified and can do chemical analysis.
The model identification of the product is engraved with a laser, which is not as easy to rub off as the ink stamp.
Barcode-tracked batches from wire coil to final packaging
Need volume fast?
Our warehouse stocks 8+ million A2-70 hex bolts across M6-M36 sizes - all ASME B18.2.1 compliant and ready to ship.
For wholesale partners
Specification
304 Stainless Steel (AISI 304)
Chemical Composition
Cr: 18-20%, Ni: 8-10.5%, C: ≤0.08%, Mn: ≤2%, Si: ≤1%, P: ≤0.045%, S: ≤0.03%
Mechanical Properties
≥515 MPa
Mechanical Properties
≥205 MPa
≤201 HB (Brinell); ≤92 HRB (Rockwell)
Corrosion Resistance
Excellent in atmospheric, water, and mild chemical environments; resistant to rust and oxidation
Temperature Range
-270°C to 870°C (short-term); -196°C to 815°C (continuous service)
Magnetic Property
Non-magnetic (annealed condition)
Metric Size (M)
Thread Pitch (mm)
Hex Head Width (mm)
Hex Head Height (mm)
Length Range (mm)
Imperial Equivalent
Thread Type (Imperial)
UNC (1/4"-20), UNF (1/4"-28)
UNC (5/16"-18), UNF (5/16"-24)
UNC (3/8"-16), UNF (3/8"-24)
Standard Compliance
Key Features
Typical Applications
ISO 4017 (Metric)
Unified hex head design, consistent thread tolerance
Food processing equipment, marine hardware, chemical tanks
ASME B18.2.1 (Imperial)
Precise thread dimensions, high interchangeability
Architectural structures, water treatment systems, HVAC
Full thread option, wide size range
Medical devices, pharmaceutical machinery, outdoor furniture
304 Stainless Steel
316 Stainless Steel
Carbon Steel (Galvanized)
Corrosion Resistance
Excellent (saltwater)
Moderate (prone to rust)
Temperature Resistance
Non-magnetic
Non-magnetic
Frequently Asked Questions
Q: How do you ensure the accuracy of product specifications?
A: Each product is inspected by our QC team using precision instruments, and we provide MTC (Material Test Certificate) to confirm specifications.
Q: What is the minimum order quantity (MOQ) for custom products?
A: The MOQ for custom products depends on specifications, but generally starts from 1 pieces. For special cases, we can discuss further.
Q: Can you print our company logo on the products?
A: Yes, we can print your logo via laser engraving or stamping, as long as you provide the design file.
