S-94688A325 1/2"-13 x 1 1/4" ASME B18.2.1 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for high-stress industrial applications
• Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh environmental conditions
• Reliable thread engagement with Unified Standard Class 3A fit ensuring precise mating with nuts and threaded components
• Optimized torque transmission via external square drive design that prevents tool slippage during installation
• Enhanced durability from SAE Grade 8 steel construction that withstands extreme mechanical stresses
• Versatile coarse threading (UNC 1/2"-13) that resists loosening in high-vibration environments
• Full-length threading providing maximum adjustment flexibility and grip length in assembled connections

Professional Applications & Engineering Value

This SAE Grade 8 square head screw delivers critical performance in demanding industrial environments where failure is not an option. The zinc yellow-chromate plating creates a protective barrier against corrosion in outdoor construction, manufacturing facilities, and marine-adjacent applications. The 1/2"-13 UNC coarse threading combined with Class 3A thread fit ensures rapid assembly while maintaining vibration resistance in heavy machinery, structural steel connections, and equipment frames. The external square drive design allows for high-torque installation without cam-out, making it ideal for applications where socket or wrench access is preferred. Engineered to ASME B18.2.1 specifications, this fastener provides predictable performance and interchangeability in critical load-bearing assemblies.

Specification Summary & Compliance

This square head screw features precision Unified Standard Class 3A thread fit with 1/2"-13 UNC coarse threading and full-length threads. Manufactured from high-strength steel to SAE Grade 8 requirements with 150,000 psi tensile strength. Dimensions include 1 1/4" length, 3/4" head width, and 21/64" head height. The zinc yellow-chromate plating provides corrosion protection while maintaining dimensional accuracy. Compliant with ASME B18.2.1 specifications for dimensional standards and manufacturing consistency.