S-91465A290 1"-8 x 7" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• High tensile strength construction with 60,000 psi rating ensures reliable performance under significant mechanical stress in demanding applications.
• Durable ASTM A307 Grade A steel material provides excellent resistance to wear and deformation, extending service life in industrial environments.
• External square drive head design allows for secure tool engagement and high-torque application, reducing slippage during installation.
• Coarse UNC thread with Class 2A fit offers faster assembly and better debris resistance compared to fine threads, ideal for construction and heavy equipment.
• Partially threaded 7-inch shank provides optimal grip length for thick materials while minimizing weight and material usage.
• RoHS 3 compliance ensures environmental safety and regulatory acceptance for international industrial projects.
• Right-hand thread direction with unified standards guarantees compatibility with common North American industrial equipment and replacement parts.

Professional Applications & Engineering Value

This 1"-8 UNC square head screw delivers critical engineering value through its ASTM A307 Grade A steel construction and coarse thread spacing, specifically designed to address vibration loosening and high-load scenarios in structural applications. The partially threaded design concentrates tensile strength where needed most, preventing joint failure in timber construction, machinery bases, and infrastructure projects. With Rockwell B69 hardness and external square drive, it withstands repetitive impact during installation and maintains clamp force in environments where hex heads might strip. Engineers specify this heavy-duty square head bolt for permanent installations requiring dependable, long-term fastening solutions that minimize maintenance cycles.

Specification Summary & Compliance

This square head screw maintains Unified Standard Class 2A thread fit tolerances for consistent engagement and meets ASTM A307 specifications for low-carbon steel fasteners. The 1"-8 UNC coarse thread provides standardized spacing compatible with industrial nuts and tapped holes. Manufacturing complies with RoHS 3 (2015/863/EU) environmental regulations, containing no restricted hazardous substances. Dimensional accuracy includes 7" overall length with 2.5" minimum thread length, 1 1/2" head width, and 21/32" head height for proper wrench clearance.