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Fujian A320 B8M Nut Bolt
QS Fastener: Fujian A320 B8M Nut Bolt
Name: Fujian A320 B8M Nut Bolt
Size: 5/8 Inch
Material for Stud Bolt: ASTM A193 Gr.B8M CL 2
Material for Nut: A194 GR.8M
Thread: 11 UNC
Total Length: 3.75 Inch
Standard: Bolt ASME B18.31.2/Nut ASME B18.2.2
Size: 5/8 Inch
Material for Stud Bolt: ASTM A193 Gr.B8M CL 2
Material for Nut: A194 GR.8M
Thread: 11 UNC
Total Length: 3.75 Inch
Standard: Bolt ASME B18.31.2/Nut ASME B18.2.2
Quantity
The A320 B8M Nut Bolt (5/8 inch, 11 UNC) is a high-performance fastener system engineered for demanding industrial environments. Manufactured in Fujian, this stud bolt and nut assembly complies with ASME B18.31.2 and ASME B18.2.2, delivering precision, reliability, and long service life. The bolt is produced from ASTM A193 Gr.B8M Class 2 – a molybdenum-bearing austenitic stainless steel – while the mating nut meets ASTM A194 Gr.8M, ensuring matched metallurgy and optimal galling resistance during make-up.
Material & Mechanical Advantages
The B8M alloy (equivalent to 316 stainless steel) offers superior resistance to pitting, crevice corrosion, and chloride attack compared to conventional 304/B8 grades. The Class 2 designation indicates strain-hardened properties, providing higher tensile strength (minimum 95 ksi) without sacrificing ductility. The 11 UNC thread form (coarse pitch) enables rapid assembly and reduces cross-threading risks, while the 3.75-inch overall length accommodates standard flange connections and heavy-walled equipment.
The B8M alloy (equivalent to 316 stainless steel) offers superior resistance to pitting, crevice corrosion, and chloride attack compared to conventional 304/B8 grades. The Class 2 designation indicates strain-hardened properties, providing higher tensile strength (minimum 95 ksi) without sacrificing ductility. The 11 UNC thread form (coarse pitch) enables rapid assembly and reduces cross-threading risks, while the 3.75-inch overall length accommodates standard flange connections and heavy-walled equipment.
Key Application Scenarios
These fasteners excel in oil refineries, chemical processing plants, offshore platforms, power generation, and pulp & paper mills – wherever elevated temperatures (up to 850°F / 454°C) and corrosive media (seawater, sour gas, caustic solutions) are present. They are the preferred choice for pressure vessel manways, heat exchanger flanges, valve bonnets, and pipe flanges in ASME B16.5 assemblies, particularly when NACE MR0175 compliance is required for sour service.
These fasteners excel in oil refineries, chemical processing plants, offshore platforms, power generation, and pulp & paper mills – wherever elevated temperatures (up to 850°F / 454°C) and corrosive media (seawater, sour gas, caustic solutions) are present. They are the preferred choice for pressure vessel manways, heat exchanger flanges, valve bonnets, and pipe flanges in ASME B16.5 assemblies, particularly when NACE MR0175 compliance is required for sour service.
Why Choose the A320 B8M Nut Bolt?
- Corrosion durability – Resists intergranular attack after exposure to sensitizing temperatures.
- High-temperature stability – Retains creep-rupture strength under cyclic thermal loading.
- Interchangeability – Standard dimensions ensure drop-in replacement for legacy installations.
- Quality assurance – Each lot is traceable with mill test reports and dimensional inspection.
- Corrosion durability – Resists intergranular attack after exposure to sensitizing temperatures.
- High-temperature stability – Retains creep-rupture strength under cyclic thermal loading.
- Interchangeability – Standard dimensions ensure drop-in replacement for legacy installations.
- Quality assurance – Each lot is traceable with mill test reports and dimensional inspection.
Conclusion
For engineers seeking a dependable, code-compliant fastening solution in severe service conditions, the Fujian A320 B8M 5/8"nut bolt offers proven performance. Its balanced combination of strength, metallurgical stability, and corrosion resistance reduces unplanned downtime and extends maintenance intervals. Specify ASTM A193/A194 Gr.8M for your next critical bolting project – and secure your assets with industry-recognized reliability.
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