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Putian Black Oxide Stud Bolt
QS Fastener: Putian Black Oxide Stud Bolt
Product : Putian Black Oxide Stud Bolt
Thread: 8 UNC
Thread Class: 2A
Size: 1-5/8 Inch
Material: ASTM A193 B16
Length: 320 mm
Standard for Bolt: ASME B18.31.2
Thread: 8 UNC
Thread Class: 2A
Size: 1-5/8 Inch
Material: ASTM A193 B16
Length: 320 mm
Standard for Bolt: ASME B18.31.2
Quantity
Our Black Oxide Stud Bolt is a premium-grade threaded fastener engineered for high-stress, high-temperature service. Manufactured from ASTM A193 B16 chromium-molybdenum-vanadium steel, this stud bolt offers outstanding tensile strength, creep resistance, and toughness – essential properties for critical bolting connections in power generation, petrochemical, and pressure vessel applications. The black oxide surface treatment not only provides a uniform, aesthetically consistent finish but also adds a thin, absorptive coating that retains lubricants and offers mild corrosion protection during storage and installation.
Precision Threading & Dimensions
Featuring an 8 UNC thread series with Class 2A external thread tolerance, this Black Oxide Stud Bolt ensures smooth engagement and consistent clamp load when mated with compatible nuts. The nominal size of 1‑5/8 inch (41.275 mm) and overall length of 320 mm conform to ASME B18.31.2 – the industry standard for heavy‑duty studs. Every thread is roll‑formed to maintain grain flow integrity, reducing the risk of fatigue failure under cyclic loading.
Featuring an 8 UNC thread series with Class 2A external thread tolerance, this Black Oxide Stud Bolt ensures smooth engagement and consistent clamp load when mated with compatible nuts. The nominal size of 1‑5/8 inch (41.275 mm) and overall length of 320 mm conform to ASME B18.31.2 – the industry standard for heavy‑duty studs. Every thread is roll‑formed to maintain grain flow integrity, reducing the risk of fatigue failure under cyclic loading.
Typical Applications
This Black Oxide Stud Bolt is widely specified for flange connections, heat exchangers, boilers, and high‑pressure piping systems where operating temperatures range from –50 °F to +1100 °F. It is also suitable for valve bonnets, turbine casings, and offshore platform equipment that demand reliable bolting under thermal expansion and vibration. For critical service, we recommend pairing it with ASTM A194 grade 2H or grade 4 heavy hex nuts and proper thread lubricants to achieve accurate preload.
This Black Oxide Stud Bolt is widely specified for flange connections, heat exchangers, boilers, and high‑pressure piping systems where operating temperatures range from –50 °F to +1100 °F. It is also suitable for valve bonnets, turbine casings, and offshore platform equipment that demand reliable bolting under thermal expansion and vibration. For critical service, we recommend pairing it with ASTM A194 grade 2H or grade 4 heavy hex nuts and proper thread lubricants to achieve accurate preload.
Quality Assurance
Each lot is traceable with mill test reports, and dimensional inspections verify pitch diameter, major/minor diameters, and length tolerances per ASME B18.31.2. The black oxide coating is applied via a controlled alkaline bath process, ensuring consistent depth without hydrogen embrittlement risk.
Each lot is traceable with mill test reports, and dimensional inspections verify pitch diameter, major/minor diameters, and length tolerances per ASME B18.31.2. The black oxide coating is applied via a controlled alkaline bath process, ensuring consistent depth without hydrogen embrittlement risk.
Why Choose This Black Oxide Stud Bolt
- Material: ASTM A193 B16 – proven for elevated-temperature strength.
- Thread: 8 UNC Class 2A – interchangeable with standard tapped holes.
- Standard: Fully ASME B18.31.2 compliant – guaranteed interchangeability.
- Finish: Black oxide – improves lubricant retention and reduces galling during make‑up.
- Material: ASTM A193 B16 – proven for elevated-temperature strength.
- Thread: 8 UNC Class 2A – interchangeable with standard tapped holes.
- Standard: Fully ASME B18.31.2 compliant – guaranteed interchangeability.
- Finish: Black oxide – improves lubricant retention and reduces galling during make‑up.
Available in custom lengths and with optional PTFE or zinc‑flake coatings upon request. For engineering support or certification packages, contact our technical team. Choose our Black Oxide Stud Bolt for safe, repeatable, and code‑compliant bolting in your most demanding projects.
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