S-91259A376 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 demanding applications
• Precision alignment and spacing through the 6" shoulder with tight diameter and length tolerances for consistent component positioning
• Superior corrosion resistance with black oxide finish providing durable protection in industrial environments
• High-torque installation capability with 7/8" hex drive socket and knurled head for secure tool engagement and reduced slippage
• Precision thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Enhanced durability through Rockwell C32 hardness and alloy steel construction for long service life
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering value in applications requiring precise component alignment and high mechanical strength. The 6" precision shoulder with tight diameter and length tolerances (-0.004" to -0.002" and -0.005" to 0.005" respectively) ensures accurate spacing and rotational control in machinery, automation systems, and heavy equipment. The black oxide finish provides essential corrosion protection while maintaining dimensional stability. With UNC coarse threads in Class 3A fit and 140,000 psi tensile strength, this socket head shoulder screw solves critical challenges in high-vibration environments where loosening and misalignment can cause equipment failure. The combination of Rockwell C32 hardness and 7/8" hex drive with knurled head ensures reliable installation and removal in maintenance-intensive industrial settings.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit with UNC 1 1/8"-7 coarse threading and precise shoulder dimensions (1½" diameter, 6" length) manufactured to tight tolerances. The product conforms to ASME B18.3 specifications for dimensional standards and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, ensuring suitability for regulated industrial applications worldwide.