S-91465A116 5/16"-18 x 1" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external square drive design for secure installation and reduced tool slippage
• Enhanced durability through ASTM Grade A steel construction with 60,000 psi tensile strength
• Reliable coarse threading (UNC) ensures faster assembly and better performance in softer materials
• Precision thread fit (Class 2A) guarantees consistent engagement and vibration resistance
• Full threading along the 1" length provides maximum grip and load distribution
• Rockwell B69 hardness maintains structural integrity under repeated stress
• Environmental compliance with RoHS 3 standards for safe use in regulated industries

Professional Applications & Engineering Value

This 5/16"-18 UNC square head screw delivers exceptional performance in industrial applications where reliability is paramount. Manufactured from ASTM A307 Grade A steel, it offers optimal strength-to-weight ratio for construction, machinery assembly, and structural frameworks. The coarse thread design prevents cross-threading during high-speed installation while providing superior holding power in wood, plastic, and soft metals. The external square drive enables high-torque applications without cam-out, making it ideal for maintenance operations and heavy equipment. With full threading and Class 2A tolerance, it ensures consistent clamping force across the entire fastener length, reducing the risk of joint failure in vibrating environments.

Specification Summary & Compliance

This square head screw features Unified Standard Class 2A thread fit with 5/16"-18 UNC coarse threads and right-hand orientation. The fastener meets ASTM A307 specifications for low-strength applications and demonstrates RoHS 3 (2015/863/EU) compliance for environmental safety. Manufacturing standards ensure dimensional accuracy with 1" length, 1/2" head width, and 13/64" head height maintained within industrial tolerances.