S-91465A194 1/2"-13 x 8" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Grade A steel construction providing reliable performance in demanding industrial environments
• Superior torque transmission through external square drive design for secure installation and removal
• High tensile strength rating of 60,000 PSI ensures structural integrity under heavy loads
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and reduced cross-threading risk
• Versatile partial threading allows for both clamping and alignment functions in various applications
• Environmental compliance with RoHS 3 standards for safe use in regulated industries
• Consistent quality assurance through ASTM A307 specifications for reliable mechanical properties

Professional Applications & Engineering Value

This 1/2"-13 UNC square head screw delivers critical engineering solutions where high-strength fastening meets practical installation needs. The Grade A steel construction with Rockwell B69 hardness provides optimal balance between strength and machinability, resisting deformation under load while maintaining installation-friendly characteristics. The external square drive design ensures maximum torque transfer without cam-out issues common in Phillips drives, making it ideal for heavy machinery, structural steel connections, and construction applications where vibration resistance is paramount. The partially threaded configuration allows the unthreaded shank to act as a precision alignment feature while the threaded portion provides secure clamping force. With coarse UNC threading, this fastener excels in wood-to-metal connections, structural framing, and equipment assembly where rapid installation and disassembly are required.

Specification Summary & Compliance

This square head screw maintains Unified Standard Class 2A thread tolerances for consistent fit and performance. Manufactured to ASTM A307 specifications, it delivers reliable mechanical properties including 60,000 PSI tensile strength. The fastener is RoHS 3 (2015/863/EU) compliant for environmental safety and features right-hand UNC coarse threads with 1/2"-13 sizing. The 8" length with 1-1/2" minimum thread length provides versatile fastening capabilities across industrial applications.