S-91268A230 1 1/4"-7 x 12" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life in demanding environments
• Secure fastening with coarse UNC threads that provide excellent grip and reduced risk of cross-threading during installation
• Optimized torque transmission through the external hex drive design, allowing for efficient installation with standard tools
• Reduced material costs through partial threading while maintaining full strength in critical engagement areas
• Industry-standard compatibility with Class 2A thread fit ensuring consistent performance across mating components
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The 1-1/4"-7 UNC coarse thread configuration provides superior resistance to vibration loosening while enabling faster installation in thick materials. Manufactured from high-strength steel with precise Class 2A thread fit, these fasteners eliminate play and ensure consistent clamping force in critical joints. The partially threaded design concentrates strength where needed most while reducing material usage, making them ideal for applications requiring precise unthreaded shank sections. With external hex drive compatibility, they offer reliable torque transmission for maintenance operations in confined spaces.

Specification Summary & Compliance

This 12" length hex head screw features 1-1/4"-7 UNC coarse threads with Class 2A thread fit tolerance for precise mating. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety. The partially threaded design maintains full 150,000 psi tensile strength throughout the threaded portion while providing an unthreaded shank section for specific application requirements.