S-92327A115 1/2"-13 x 4 1/2" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with SAE Grade 5 rating and 120,000 psi tensile strength, ensuring reliable performance under high-stress conditions.
• Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Precise thread engagement with Unified Standard Class 3A fit and 1/2"-13 UNC coarse threads, reducing cross-threading risks and enabling faster assembly.
• Optimized torque application thanks to the external square drive and square head design, providing secure grip with standard tools.
• Reduced weight and material use through partially threaded design, maintaining strength while minimizing costs.
• Consistent hardness at Rockwell C25, preventing deformation under repeated loads and ensuring long-term fastener integrity.
• Broad compatibility with ASME B18.2.1 and SAE J429 standards, guaranteeing interchangeability and compliance in regulated applications.

Professional Applications & Engineering Value

This 1/2"-13 UNC square head screw is engineered for demanding industrial settings where vibration resistance and structural integrity are critical. The SAE Grade 5 steel construction, combined with a zinc yellow-chromate plated finish, effectively combats rust and chemical exposure in outdoor or high-moisture environments like construction, machinery assembly, and transportation equipment. Its coarse thread design allows for quick installation in softer materials or when alignment is challenging, while the partially threaded shank concentrates strength where needed, reducing stress concentration. The external square drive ensures high torque transmission without slippage, making it ideal for heavy-duty bolting applications requiring reliable, repeatable fastening.

Specification Summary & Compliance

This screw adheres to Unified Standard Class 3A thread fit for precise dimensional accuracy and is manufactured in compliance with ASME B18.2.1 and SAE J429 specifications. It features a 4 1/2" length, 1/2"-13 UNC coarse threads, and a partially threaded design. The product meets common industry standards for mechanical properties and is suitable for applications requiring medium to high strength fasteners with reliable performance metrics.