S-91571A318 7/8"-9 x 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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in heavy-duty structural applications
• Superior thread engagement through fully threaded 7/8"-9 UNC coarse thread design that resists vibration loosening
• Precise installation control with external hex drive and Class 2A thread fit ensuring consistent clamping force
• Enhanced durability from Rockwell C19 hardness steel construction that withstands harsh industrial environments
• Regulatory compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for quality verification
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable procurement decisions
• Optimized head dimensions (1 7/16" width, 35/64" height) providing ample wrench clearance for efficient installation

Professional Applications & Engineering Value

These Grade A325 hex head screws deliver critical structural integrity where failure is not an option. The high-strength steel construction combined with Rockwell C19 hardness provides exceptional resistance to shear and tensile stresses in demanding applications. The 7/8"-9 UNC coarse thread configuration ensures rapid installation while maintaining superior holding power in structural steel connections, bridge construction, and heavy machinery assembly. The fully threaded design maximizes engagement depth, distributing load evenly across the entire fastener length. External hex drive compatibility with standard tools simplifies maintenance and inspection procedures in confined spaces. These industrial-grade hex bolts solve vibration-induced loosening challenges while meeting rigorous engineering specifications for construction and manufacturing applications.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse thread spacing (9 threads per inch). Complies with ASME B18.2.6 dimensional standards and ASTM A325/ASTM F3125 material specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features right-hand thread direction and standardized hex head configuration for consistent performance across industrial applications.