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Wuxi SS304 Hex Bolt
QS Fastener: Wuxi SS304 Hex Bolt
Name: Wuxi SS304 Hex Bolt
Standard: DIN933
Material: SS304
Size: M3
Lenght: 14
Surface: Natural color
Standard: DIN933
Material: SS304
Size: M3
Lenght: 14
Surface: Natural color
Delivery
EXW, FCA, FOB
minimum order
1000 pieces
Supply Ability
150000pieces / Month
Country of Origin
China
Stock Time
7-30Day
Quantity
US $0.01 - US $1.00
/ pieces
Wuxi SS304 Hex Bolt, manufactured to DIN933/ISO 4017, is produced from genuine SS304 (A2-70) austenitic stainless steel with a minimum tensile strength of 700 MPa. Its natural metallic finish eliminates the need for coatings, offering both environmental benefits and an attractive appearance. The 14 mm fully threaded shank is optimized for thin-wall assemblies, while sharp threads and consistent torque characteristics make this bolt suitable for precision electronics, food machinery, and marine equipment. The fastener industry in Wuxi represents a critical hub within the Yangtze River Delta advanced manufacturing region, housing established players such as Böllhoff (Wuxi) and supporting a complete supply chain from raw material processing to surface finishing. Choosing Wuxi SS304 Hex Bolt ensures ready stock availability and rapid small-lot dispatch, significantly reducing lead times and procurement costs.
Technical Verification and Corrected Application Scenarios
1. Building Curtain Walls
Glass-to-aluminum sub-frame connections commonly employ A2-70 M6–M12 bolts with EPDM gaskets. The assembly must resist acid rain, salt spray, and UV exposure, passing GB/T 10125 neutral salt spray tests for 1,000 hours without red rust. As aluminum is electro-negative to stainless steel, insulating washers are mandatory to prevent galvanic corrosion. Preload is set at 0.7 × yield strength (typical torque 15 N·m for M8), ensuring stability under ±2 kN/m² wind loads.
1. Building Curtain Walls
Glass-to-aluminum sub-frame connections commonly employ A2-70 M6–M12 bolts with EPDM gaskets. The assembly must resist acid rain, salt spray, and UV exposure, passing GB/T 10125 neutral salt spray tests for 1,000 hours without red rust. As aluminum is electro-negative to stainless steel, insulating washers are mandatory to prevent galvanic corrosion. Preload is set at 0.7 × yield strength (typical torque 15 N·m for M8), ensuring stability under ±2 kN/m² wind loads.
2. Food Machinery
Conveyors, tanks, and valves require A2-70 bolts to prevent iron-ion migration. The material must comply with FDA 21 CFR 177.1550, limiting total iron leaching to ≤ 0.1 mg/L (distilled water, 100 °C, 30 min). Mechanical polishing to Ra ≤ 0.8 µm, followed by passivation per ASTM A967 (20 % V/V HNO₃, 50 °C, 30 min), is mandatory. Post-assembly, a 0.5 % peracetic acid CIP cycle confirms no rust formation within 72 hours.
Conveyors, tanks, and valves require A2-70 bolts to prevent iron-ion migration. The material must comply with FDA 21 CFR 177.1550, limiting total iron leaching to ≤ 0.1 mg/L (distilled water, 100 °C, 30 min). Mechanical polishing to Ra ≤ 0.8 µm, followed by passivation per ASTM A967 (20 % V/V HNO₃, 50 °C, 30 min), is mandatory. Post-assembly, a 0.5 % peracetic acid CIP cycle confirms no rust formation within 72 hours.
3. Offshore Platforms
In splash zones with chloride concentrations up to 19 g/L, the material should be upgraded to 316L (A4-80, Rm ≥ 800 MPa). The PREN value = 16 × [%Cr] + 1.5 × [%Mo] = 16 × 16.5 + 1.5 × 2.1 = 27.2, exceeding the critical pitting index of 24. Solution treatment (1050 °C / 30 min / water quench) and electropolishing to Ra 0.4 µm are required. Per NORSOK M-001, a 25-year design life demands a critical pitting temperature ≥ 35 °C per ASTM G48 Method A.
In splash zones with chloride concentrations up to 19 g/L, the material should be upgraded to 316L (A4-80, Rm ≥ 800 MPa). The PREN value = 16 × [%Cr] + 1.5 × [%Mo] = 16 × 16.5 + 1.5 × 2.1 = 27.2, exceeding the critical pitting index of 24. Solution treatment (1050 °C / 30 min / water quench) and electropolishing to Ra 0.4 µm are required. Per NORSOK M-001, a 25-year design life demands a critical pitting temperature ≥ 35 °C per ASTM G48 Method A.
4. Pharmaceutical Cleanrooms
ISO 14698-1 mandates crevice-free surfaces to minimize microbial adhesion. For this application, upgrading to 316L (A4-80) with electropolishing to Ra ≤ 0.2 µm, a peak-to-valley roughness ≤ 2 µm, and a Cr/Fe atomic ratio ≥ 1.5 (XPS-verified) is recommended. After 100 sterilization cycles in 0.1 % peracetic acid + 0.1 % hydrogen peroxide, no pitting or chromium loss ≥ 5 % should occur.
ISO 14698-1 mandates crevice-free surfaces to minimize microbial adhesion. For this application, upgrading to 316L (A4-80) with electropolishing to Ra ≤ 0.2 µm, a peak-to-valley roughness ≤ 2 µm, and a Cr/Fe atomic ratio ≥ 1.5 (XPS-verified) is recommended. After 100 sterilization cycles in 0.1 % peracetic acid + 0.1 % hydrogen peroxide, no pitting or chromium loss ≥ 5 % should occur.
5. PV Mounting Structures
For 25-year outdoor service, A2-70 fully threaded M8 × 60 bolts with flange nuts are specified. The material must pass IEC 61215 ammonia (500 h) and UV (15 kWh/m²) aging tests. Light brushing to Ra 0.6–0.8 µm avoids coating cracks. Threads must meet class 6g with 100 % GO/NO-GO compliance. A torque coefficient K = 0.18 ± 0.02 ensures a 22 kN preload at 25 N·m, resisting wind loads of 1.4 kN/m² and snow loads of 0.7 kN/m².
For 25-year outdoor service, A2-70 fully threaded M8 × 60 bolts with flange nuts are specified. The material must pass IEC 61215 ammonia (500 h) and UV (15 kWh/m²) aging tests. Light brushing to Ra 0.6–0.8 µm avoids coating cracks. Threads must meet class 6g with 100 % GO/NO-GO compliance. A torque coefficient K = 0.18 ± 0.02 ensures a 22 kN preload at 25 N·m, resisting wind loads of 1.4 kN/m² and snow loads of 0.7 kN/m².
Summary
The Wuxi SS304 Hex Bolt (A2-70) is a versatile, corrosion-resistant fastener suitable for diverse industrial environments. However, material selection must be tailored to specific conditions—316L upgrades are essential for marine and pharmaceutical applications, while proper surface finishing and passivation are non-negotiable for food and cleanroom use. Wuxi’s robust fastener industry, with its integrated supply chain and technical expertise, ensures that Wuxi SS304 Hex Bolt products meet rigorous international standards while offering competitive lead times. This combination of material science, application-specific engineering, and local manufacturing excellence makes Wuxi a reliable source for high-performance stainless steel fasteners.
The Wuxi SS304 Hex Bolt (A2-70) is a versatile, corrosion-resistant fastener suitable for diverse industrial environments. However, material selection must be tailored to specific conditions—316L upgrades are essential for marine and pharmaceutical applications, while proper surface finishing and passivation are non-negotiable for food and cleanroom use. Wuxi’s robust fastener industry, with its integrated supply chain and technical expertise, ensures that Wuxi SS304 Hex Bolt products meet rigorous international standards while offering competitive lead times. This combination of material science, application-specific engineering, and local manufacturing excellence makes Wuxi a reliable source for high-performance stainless steel fasteners.
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