S-91465A278 3/4"-10 x 12" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• High tensile strength construction with ASTM A307 Grade A steel provides reliable load-bearing capacity for demanding industrial applications
• External square drive design ensures superior torque transmission and prevents tool slippage during installation
• Coarse UNC threading offers faster installation and reduced cross-threading risks in heavy-duty assemblies
• Partially threaded configuration allows for precise clamping force control and secure joint connections
• Unified Standard Class 2A thread fit guarantees consistent mating compatibility with standard nuts and components
• RoHS 3 compliance ensures environmental responsibility while meeting international regulatory standards
• Substantial 12-inch length accommodates thick material sections and deep penetration requirements

Professional Applications & Engineering Value

This 3/4"-10 UNC square head screw delivers exceptional engineering value through its ASTM A307 Grade A steel construction and robust design. The external square drive provides maximum torque resistance, preventing cam-out in high-tension applications while the coarse thread spacing ensures rapid installation in structural steel, heavy machinery, and construction frameworks. The partially threaded design concentrates strength where needed most, offering superior resistance to vibration loosening in industrial equipment, bridge construction, and infrastructure projects. With 60,000 psi tensile strength and Rockwell B69 hardness, this fastener maintains integrity under extreme mechanical stress, making it ideal for permanent installations requiring long-term reliability.

Specification Summary & Compliance

This square head screw features Unified Standard Class 2A thread fit with precise dimensional accuracy per inch system requirements. Manufacturing complies with ASTM A307 specifications for Grade A carbon steel bolts, ensuring consistent performance across industrial applications. The fastener is RoHS 3 (2015/863/EU) compliant, meeting international environmental standards while maintaining the mechanical properties required for structural fastening. Thread specifications include 3/4"-10 UNC coarse spacing with right-hand orientation and 2-inch minimum thread length on the partially threaded shank.