S-91465A257 3/4"-10 x 5" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external square drive design for secure installation in high-torque applications
• Reliable mechanical performance with ASTM A307 Grade A certification ensuring consistent quality and strength
• Excellent thread engagement with Unified Standard Class 2A thread fit for precise assembly and vibration resistance
• Robust material construction using durable steel with 60,000 psi tensile strength for heavy-duty load requirements
• Enhanced durability with Rockwell B69 hardness providing resistance to wear and deformation
• Environmental compliance with RoHS 3 (2015/863/EU) standards for safe use in regulated industries
• Optimized thread design with coarse UNC threading for faster installation and reduced cross-threading risk

Professional Applications & Engineering Value

This 3/4"-10 UNC square head screw delivers exceptional engineering value for industrial fastening applications requiring reliable performance under stress. The ASTM A307 Grade A steel construction provides a balanced combination of strength and ductility, making it ideal for structural connections, machinery assembly, and construction projects where 60,000 psi tensile strength is essential. The external square drive enables high-torque installation without cam-out, while the coarse UNC threading ensures quick assembly in materials where fine threads might strip or fail. The partially threaded design concentrates strength where needed most, and the Unified Standard Class 2A thread fit guarantees consistent engagement across mating components. These features make it particularly valuable in construction, heavy equipment maintenance, and industrial machinery where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

This square head screw maintains precise Unified Standard Class 2A thread fit tolerances with 3/4"-10 UNC coarse thread spacing and right-hand threading. Manufactured to ASTM A307 Grade A specifications, it delivers 60,000 psi tensile strength and Rockwell B69 hardness. The fastener is RoHS 3 (2015/863/EU) compliant and meets all relevant environmental regulations for industrial use. With dimensions of 5" length, 1/2" head height, and 1 1/8" head width, it provides consistent performance in inch-system applications requiring reliable heavy-duty fastening solutions.