S-94688A324 1/2"-13 x 1" ASME B18.2.1 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength with 150,000 PSI rating ensures reliable performance in high-stress applications, preventing fastener failure under heavy loads.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, reducing maintenance and replacement costs.
• Precise Class 3A thread fit guarantees secure mating with nuts and threaded holes, minimizing backlash and improving assembly integrity.
• External square drive design provides excellent torque transmission and easy installation with standard tools, even in confined spaces.
• Fully threaded shank offers consistent gripping strength along the entire length, accommodating various material thicknesses securely.
• Coarse UNC threading enables quick assembly and disassembly, reducing labor time in maintenance and production lines.
• High-strength SAE Grade 8 steel construction delivers durability and fatigue resistance for long-term reliability in demanding applications.

Professional Applications & Engineering Value

This 1/2"-13 UNC Grade 8 square head screw is engineered to address critical challenges in heavy machinery, structural assemblies, and industrial equipment where vibration resistance and load-bearing capacity are paramount. The high-strength steel core, combined with a zinc yellow-chromate finish, effectively combats corrosion in outdoor or chemically aggressive settings, prolonging component life. Its coarse thread design ensures rapid installation and robust holding power in soft materials or when alignment adjustments are needed. The external square drive allows for high-torque application without cam-out, making it ideal for construction, automotive, and manufacturing sectors where reliability under dynamic stresses is essential. Fully compliant with ASME B18.2.1 standards, it provides consistent quality for engineering projects requiring precise Class 3A thread fit and dependable performance.

Specification Summary & Compliance

This square head screw features a 1/2"-13 UNC coarse thread with Class 3A thread fit for tight tolerances and secure fastening. It adheres to ASME B18.2.1 manufacturing specifications, ensuring dimensional accuracy and interoperability. The product is constructed from SAE Grade 8 steel, delivering a tensile strength of 150,000 PSI, and includes a zinc yellow-chromate plating for enhanced corrosion protection. It meets industry standards for high-strength applications and is suitable for use in environments requiring reliable, heavy-duty fastening solutions.