S-92327A311 1/2"-13 x 3" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength with 120,000 psi rating ensures reliable performance under heavy loads and vibration
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments
• Precise Class 2A thread fit guarantees consistent engagement and reduces cross-threading risks during installation
• External square drive design provides maximum torque transmission and prevents tool slippage during tightening
• SAE Grade 5 certification delivers verified medium-strength performance for critical structural applications
• Coarse UNC threading enables faster installation and better performance in softer materials or dirty conditions
• Full threading along the 3" length allows for adjustable positioning and maximum grip range in assembled components

Professional Applications & Engineering Value

This 1/2"-13 UNC Square Head Screw delivers critical engineering solutions where medium strength fasteners must withstand substantial mechanical stress. The SAE Grade 5 steel construction with Rockwell C25 hardness provides optimal balance between strength and ductility, preventing brittle failure in dynamic load conditions. The zinc yellow-chromate plating creates a protective barrier against oxidation and chemical exposure, making these square head screws ideal for outdoor equipment, machinery frames, and structural assemblies exposed to moisture or industrial atmospheres. The external square drive accommodates standard wrenching tools for high-torque applications where socket heads might strip, while the coarse UNC threading maintains holding power in materials prone to vibration-induced loosening.

Specification Summary & Compliance

Manufactured to Unified Standard Class 2A thread tolerances for precise fitment, this fully threaded fastener complies with ASME B18.2.1 dimensional specifications and SAE J429 material standards. The 1/2"-13 UNC coarse thread configuration ensures compatibility with standard mating components, while the 3" length provides consistent threading throughout the shank. Meets industry standards for mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness, with zinc yellow-chromate surface treatment offering enhanced corrosion protection for demanding industrial environments.