S-91259A357 1 1/8"-7 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications
• Superior corrosion resistance provided by the black oxide finish, extending service life in demanding industrial environments
• Precise component alignment enabled by the Class 3A thread fit and standard shoulder fit for accurate positioning in assemblies
• Enhanced grip and torque application through the knurled socket head with 7/8" hex drive for secure fastening operations
• Optimized for heavy-duty applications with Rockwell C32 hardness and coarse UNC threads for durability in vibration-prone settings
• Industry-standard compliance meeting ASME B18.3 specifications and environmental regulations including RoHS 3 and REACH
• Versatile right-hand threading with 1 1/8"-7 UNC coarse spacing for quick assembly and disassembly in maintenance operations

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment requiring reliable shoulder positioning. The combination of Class 3A thread fit and controlled shoulder diameter tolerance (-0.004" to -0.002") ensures exact component alignment in rotating assemblies, jigs, and fixtures. The black oxide finish provides essential corrosion protection while maintaining dimensional stability in harsh operating conditions. With 84,000 psi minimum shear strength and Rockwell C32 hardness, this socket head shoulder screw withstands repetitive loading and vibration in automotive, manufacturing, and heavy equipment applications. The knurled head design facilitates secure handling during installation, while the 7/8" hex drive accommodates standard industrial tools for efficient maintenance.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit with 1 1/8"-7 UNC coarse spacing and right-hand threading. Critical dimensions include shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" for precision applications. Manufactured to ASME B18.3 specifications and compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The inch system measurement ensures compatibility with North American industrial equipment and replacement part requirements.