S-92327A314 1/2"-13 x 4" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Optimized installation efficiency through external square drive design that prevents cam-out and enables high-torque application
• Enhanced thread engagement with coarse UNC threading that resists vibration loosening and simplifies alignment
• Consistent dimensional accuracy maintained through Unified Standard Class 2A thread fit for precise assembly
• Robust material integrity ensured by Rockwell C25 hardness, providing excellent wear resistance and durability
• Full-length threading offering maximum grip length and flexibility in various material thicknesses

Professional Applications & Engineering Value

This heavy-duty square head screw delivers critical engineering solutions for industrial applications where vibration resistance and high tensile strength are paramount. The SAE Grade 5 steel construction combined with coarse UNC threading provides exceptional grip in structural assemblies, machinery frames, and heavy equipment where dynamic loads are common. The zinc yellow-chromate plating offers superior protection against corrosion in outdoor or chemically aggressive environments, significantly reducing maintenance frequency. The external square drive design ensures secure tool engagement during high-torque installation, preventing stripping and ensuring proper clamping force in critical joints. These square head fasteners are engineered to maintain integrity under sustained stress, making them ideal for construction, manufacturing, and heavy machinery applications where reliability cannot be compromised.

Specification Summary & Compliance

This 1/2"-13 UNC square head screw features Unified Standard Class 2A thread fit tolerances and complies with ASME B18.2.1 and SAE J429 specifications. The fastener maintains precise dimensional control with 4" length, 1/2" thread diameter, and coarse thread spacing. Manufacturing follows standardized protocols for SAE Grade 5 classification, ensuring consistent 120,000 psi tensile strength and Rockwell C25 hardness across production batches. The zinc yellow-chromate plating meets industry standards for corrosion protection while maintaining compliance with relevant industrial fastener regulations.