S-91268A330 1 1/4"-12 x 6" 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
• Precise thread engagement with Class 2A fit and UNF fine threads for secure fastening and vibration resistance
• Optimized torque transmission through the external hex drive and 1 7/8" head width for easy installation with standard tools
• Partial threading design provides unthreaded shank strength while maintaining sufficient thread length for secure connections
• Industry-standard compliance with ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability and reliability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting international regulatory requirements

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where failure is not an option. The 1 1/4"-12 UNF fine thread configuration provides superior resistance to vibration loosening compared to coarse threads, while the partially threaded design maximizes shear strength in the unthreaded portion. The external hex drive with substantial head dimensions ensures reliable torque application without stripping, even in high-torque scenarios. Manufactured from high-strength steel with controlled hardness, these fasteners prevent galling and maintain integrity under extreme mechanical stress, making them ideal for construction equipment, automotive frames, and industrial machinery applications requiring ASME B18.2.1 compliance.

Specification Summary & Compliance

This 6" length hex head screw features precise Class 2A thread fit with 1 1/4"-12 UNF fine threads and 2 3/4" minimum thread length. Manufactured to ASME B18.2.1 specifications where identified with SAE J429, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety. The inch system measurement guarantees compatibility with North American industrial standards and replacement parts.