S-91571A407 1/2"-13 x 4 1/2" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional structural integrity with 120,000 psi tensile strength and Grade A325 classification for reliable performance in demanding applications
• Superior durability achieved through Rockwell C19 hardness steel construction that resists wear and deformation
• Optimized load distribution with 3½" grip length and partial threading design for enhanced joint stability
• Easy installation and removal featuring external hex drive and 7/8" head width for standard tool compatibility
• Precise thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
• Regulatory compliance assurance meeting ASME B18.2.6, ASTM A325 standards and environmental regulations
• Versatile industrial application with right-hand threading and 4½" overall length suitable for various structural connections

Professional Applications & Engineering Value

These Grade A325 hex head screws deliver critical engineering solutions for structural steel connections and heavy machinery assemblies. The high-strength steel construction combined with Rockwell C19 hardness addresses common failure points in industrial environments where vibration and dynamic loads compromise fastener integrity. The 1/2"-13 UNC coarse thread configuration ensures rapid installation while maintaining Class 2A thread fit precision for consistent clamping force. Particularly valuable in construction and manufacturing sectors, these partially threaded screws with 3½" grip length provide optimal stress distribution across connected materials, preventing joint slippage and maintaining structural alignment under extreme conditions. The external hex drive design accommodates standard installation tools, streamlining assembly processes in time-sensitive industrial projects.

Specification Summary & Compliance

Manufactured to exacting ASME B18.2.6 and ASTM A325 specifications, these hex head screws maintain Class 2A thread fit tolerances for precision engagement. The 1/2"-13 UNC coarse thread pattern ensures compatibility with standard industrial components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety standards are met. The fastener's dimensional accuracy includes 4½" overall length with 1" thread length and 7/8" hex head width for consistent performance across applications requiring ASTM F3125 grade equivalency.