S-91268A862 3/4"-10 x 4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity - Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress industrial environments
• Superior Wear Resistance - Rockwell C33 hardness provides exceptional durability against mechanical wear and repeated use
• Optimized Thread Engagement - 3/4"-10 UNC coarse threading with Class 2A fit offers quick assembly and secure fastening in various materials
• Enhanced Torque Application - Large 1 1/8" external hex head design allows for higher torque transmission without stripping
• Partial Threading Efficiency - 1 3/4" minimum thread length on 4" screw provides unthreaded shank strength where needed
• Industry Standard Compliance - Meets ASME B18.2.1 and SAE J429 specifications for guaranteed dimensional accuracy and performance
• Environmental Responsibility - RoHS 3 and REACH compliance ensures safe, sustainable use across global markets

Professional Applications & Engineering Value

These Grade 8 steel hex head screws deliver critical performance where failure is not an option. The 3/4"-10 UNC coarse thread configuration provides superior pull-out resistance in structural steel, heavy machinery, and construction applications, while the partial threading design prevents stress concentration at the thread root. The external hex drive with substantial 1 1/8" head width enables high-torque installation without deformation, making them ideal for bolted connections requiring precise clamp load. The Rockwell C33 hardness ensures thread integrity is maintained through repeated disassembly cycles, solving common wear issues in maintenance-intensive environments. These heavy-duty hex bolts serve as reliable solutions for bridge construction, mining equipment, industrial presses, and other applications demanding 150,000 psi tensile strength performance.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with 3/4"-10 UNC coarse thread specifications, these hex head screws guarantee precise dimensional accuracy and consistent performance. The fasteners strictly adhere to ASME B18.2.1 and SAE J429 Grade 8 manufacturing standards, ensuring mechanical properties and material quality. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming restriction of hazardous substances for safe industrial use worldwide.