S-91257A876 3/4"-16 x 2 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with Grade 8 steel construction and 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in demanding industrial environments
• Precise thread engagement with Class 2A thread fit and UNF fine threading for secure fastening and vibration resistance
• Optimized torque transmission through the external hex drive and 1 1/8" head width for efficient installation with standard tools
• Enhanced durability with Rockwell C33 hardness rating, maintaining structural integrity under repeated stress
• Versatile partial threading design allowing for both clamping force and clearance in assembly applications
• Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 standards for quality and performance reliability

Professional Applications & Engineering Value

This Grade 8 heavy-duty hex head screw delivers critical engineering solutions for industrial applications requiring maximum reliability. The 3/4"-16 UNF fine thread configuration provides superior resistance to vibration loosening in machinery, automotive, and structural assemblies. The zinc yellow-chromate plating creates a protective barrier against corrosion in harsh environments, while the partially threaded design allows for precise clamping force distribution. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener maintains integrity under extreme loads, making it ideal for heavy equipment, construction machinery, and high-performance automotive applications where failure is not an option.

Specification Summary & Compliance

This inch system fastener features precise Class 2A thread fit tolerances and complies with ASME B18.2.1 and SAE J429 manufacturing specifications. The product maintains full compliance with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring safe use across industrial sectors. Thread specifications include 3/4"-16 UNF fine thread with right-hand direction and minimum thread length of 1 3/4" on a 2 3/4" overall length partially threaded shank.