S-91465A212 5/8"-11 x 2 1/2" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external square drive design for reliable installation in high-torque applications
• Exceptional durability with Grade A steel construction and Rockwell B69 hardness for long service life
• Optimized load distribution through 60,000 PSI tensile strength, suitable for various structural applications
• Enhanced installation efficiency with coarse UNC threading that resists cross-threading and speeds assembly
• Precise thread engagement with Unified Standard Class 2A fit ensuring consistent performance
• Versatile application capability through partial threading design allowing for both clamping and alignment functions
• Environmental compliance assurance with RoHS 3 compliance meeting international regulatory standards

Professional Applications & Engineering Value

This 5/8"-11 UNC square head screw delivers exceptional engineering value in demanding industrial environments. The ASTM Grade A steel construction combined with 60,000 PSI tensile strength provides reliable performance in structural applications where vibration resistance and load-bearing capacity are critical. The coarse thread design ensures quick assembly and disassembly while maintaining secure fastening in wood, metal, and construction applications. The external square drive offers superior torque transmission compared to standard hex drives, reducing tool slippage and damage in high-torque scenarios. With partial threading, this fastener effectively combines the clamping force of threaded sections with the alignment benefits of unthreaded shanks, making it ideal for machinery assembly, structural steel connections, and heavy equipment maintenance where precision and durability are paramount.

Specification Summary & Compliance

This square head screw features Unified Standard Class 2A thread fit with 5/8"-11 UNC coarse threading and 2 1/2" length with minimum thread length of 1 1/2". Manufactured to ASTM A307 specifications with inch system measurements, including head height of 27/64" and head width of 15/16". The fastener is RoHS 3 (2015/863/EU) compliant and meets all applicable industrial standards for material composition and performance characteristics.