S-91259A363 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
• Superior wear and corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments
• Precision shoulder fit with controlled diameter and length tolerances ensures accurate alignment and reduced component wear
• High-strength alloy steel construction with Rockwell C32 hardness provides excellent durability and fatigue resistance
• Secure hex drive engagement with 7/8" drive size and knurled head for non-slip installation and removal
• Reliable coarse UNC threading with Class 3A fit enables quick assembly and vibration resistance in heavy machinery
• Industry-standard compliance with ASME B18.3 specifications ensures interchangeability and quality assurance

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for industrial applications requiring precise rotational alignment and high mechanical strength. The black oxide finish provides essential corrosion protection in manufacturing environments while maintaining dimensional stability. The 1 1/2" shoulder diameter with tight tolerances prevents bearing misalignment and reduces wear in rotating assemblies. With its 1 1/8"-7 UNC coarse thread and Class 3A fit, this fastener ensures rapid installation and reliable performance in heavy-duty equipment, automation systems, and precision machinery where vibration resistance and structural integrity are paramount. The socket head hex drive design allows for high-torque installation in confined spaces.

Specification Summary & Compliance

This shoulder screw maintains precision dimensions with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Thread specifications include 1 1/8"-7 UNC coarse thread with Class 3A fit for superior engagement. Manufacturing complies with ASME B18.3 standards for dimensional consistency and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use worldwide.