S-94688A328 1/2"-13 x 2 1/2" ASME B18.2.1 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength with 150,000 psi rating for reliable performance in high-stress industrial applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Optimized torque transmission through external square drive design, preventing tool slippage during installation
• Precise thread engagement with Unified Standard Class 3A fit, ensuring secure fastening and vibration resistance
• Enhanced installation efficiency with UNC coarse threading, allowing quicker assembly in demanding conditions
• Full-threaded design provides maximum grip length and uniform stress distribution across the entire fastener
• Industrial-grade compliance with ASME B18.2.1 specifications, guaranteeing consistent quality and performance

Professional Applications & Engineering Value

These SAE Grade 8 square head screws deliver exceptional engineering value in heavy machinery, structural steel connections, and industrial equipment assembly. The high-strength steel construction combined with 150,000 psi tensile strength addresses critical failure points in vibration-intensive applications. The zinc yellow-chromate plating provides superior protection against corrosion in outdoor or chemically aggressive environments, while the external square drive enables high-torque installation without cam-out issues. The UNC coarse thread pattern ensures rapid assembly in structural steel, construction equipment, and manufacturing machinery where reliability under extreme loads is paramount. These fully threaded fasteners maintain consistent clamping force across the entire engagement length, preventing joint loosening in dynamic loading conditions.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Unified Standard Class 3A thread fit for precision engagement. The 1/2"-13 UNC coarse thread configuration ensures optimal performance in industrial applications. Compliant with ASME B18.2.1 specifications for square head bolts, guaranteeing dimensional accuracy and mechanical properties. The right-hand threading follows industry standards for compatibility with existing equipment and tooling. These fasteners meet industrial requirements for heavy-duty applications where high tensile strength and reliable performance are critical operational parameters.