Stainless Steel 304 Hex Bolt

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.

Factory Processing

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

Production Strength

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.

Factory Commitment

For wholesale partners:

Bulk benefits: Orders >50,000 pieces get 12% discount + free RoHS testing
Delivery guarantee: 92% of orders ship in 10 days (delayed? We upgrade to air freight)
No-break promise: Shear strength below 500 MPa? Full refund + free replacement
Compliance package: Free CE/UKCA/REACH documentation - clears customs hassle-free

304 Stainless steel Hex Bolt Material Properties

Property	Specification
Material	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%
Tensile Strength	≥515 MPa
Yield Strength	≥205 MPa
Hardness	≤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)

Dimensions (Metric & Imperial)

Metric Size (M)	Thread Pitch (mm)	Hex Head Width (mm)	Hex Head Height (mm)	Length Range (mm)	Imperial Equivalent	Thread Type (Imperial)
M4	0.7	7	3.8	8-100	1/4"	UNC (1/4"-20), UNF (1/4"-28)
M5	0.8	8	4.5	10-120	5/32"	-
M6	1.0	10	5.2	12-150	3/16"	-
M8	1.25	13	6.8	16-200	5/16"	UNC (5/16"-18), UNF (5/16"-24)
M10	1.5	16	8.4	20-250	3/8"	UNC (3/8"-16), UNF (3/8"-24)

Standards & Applications

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
DIN 933	Full thread option, wide size range	Medical devices, pharmaceutical machinery, outdoor furniture

Performance vs. Other Materials

Material	304 Stainless Steel	316 Stainless Steel	Carbon Steel (Galvanized)
Corrosion Resistance	Good	Excellent (saltwater)	Moderate (prone to rust)
Strength	Medium	Medium	High
Cost	Moderate	High	Low
Temperature Resistance	Good	Better	Limited
Magnetic	Non-magnetic	Non-magnetic	Magnetic