S-91251A020 1/2"-20 x 2" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight tolerances for secure fastening and vibration resistance in critical assemblies.
- High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity over repeated use.
- Fine UNF thread design allows for finer adjustments and improved load distribution compared to coarse threads.
- Hex socket drive enables easy installation in confined spaces with standard tools, boosting assembly efficiency.
- Full threading along the 2" length ensures maximum grip and flexibility in various mounting scenarios.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. The fine UNF threads with a Class 3A fit deliver superior clamping force and stability, making it ideal for precision machinery, automotive systems, and heavy equipment where alignment and reliability are critical. The alloy steel construction combined with the protective black-oxide coating resists rust and wear, ensuring long-term performance in demanding conditions. Its hex drive design facilitates quick installation even in tight spaces, reducing assembly time and enhancing productivity for B2B clients in manufacturing and engineering sectors.
Specification Summary & Compliance
This screw adheres to Class 3A thread tolerances for high precision, with 1/2"-20 UNF fine threads and a right-hand thread direction. It meets ASTM A574 specifications for socket head cap screws and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.
