S-91274A080 8-32 x 1 1/2" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

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 zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precision Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated installations and removals.
• Coarse UNC threads enable faster installation and better performance in materials prone to stripping, improving efficiency on the production line.
• Partially threaded design allows for precise clamping force control, ideal for applications where specific grip length is critical.
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory adherence, supporting sustainable manufacturing practices.

Professional Applications & Engineering Value

These zinc-flake-coated alloy steel socket head cap screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and high mechanical stress. The UNC coarse thread design ensures quick and secure fastening in soft materials or where rapid assembly is required, while the Class 3A thread fit provides tight tolerances that resist back-off under dynamic loads. Ideal for machinery, automotive, and heavy equipment applications, the partially threaded configuration allows engineers to apply clamping force exactly where needed, preventing joint failure. The zinc-flake coating offers robust protection against rust and chemical exposure, making these screws a reliable choice for outdoor or corrosive environments, thereby reducing downtime and maintenance costs.

Specification Summary & Compliance

This product adheres to ASME B18.3 and material standards including ASTM A574 and ASTM B117, ensuring dimensional accuracy and performance reliability. Thread specifications include 8-32 UNC coarse threads with a Class 3A fit for precise engagement. The screws are compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), meeting environmental and safety regulations for global industrial use.