S-91259A496 8-32 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in high-stress applications
• Precision shoulder fit maintains consistent alignment and reduces wear in rotating assemblies and pivot points
• Superior corrosion resistance through black oxide finish that provides durable protection in demanding industrial environments
• Optimized thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Enhanced installation efficiency with hex socket drive design allowing high torque application in confined spaces
• Consistent dimensional accuracy with tight shoulder diameter and length tolerances for precise component positioning
• Long-term reliability supported by Rockwell C32 hardness for maintained performance under repeated loading cycles

Professional Applications & Engineering Value

This alloy steel shoulder screw with 8-32 UNC coarse thread and black oxide finish addresses critical engineering challenges in precision machinery and industrial equipment. The precisely machined 3/16" shoulder length serves as a reliable locating diameter for rotating components, eliminating the need for additional bushings or spacers while maintaining accurate alignment. The socket head design with hex drive enables high-torque installation in confined spaces, making it ideal for assembly applications where accessibility is limited. Engineered to withstand substantial mechanical stresses, these shoulder screws provide dependable performance in pivoting mechanisms, gear assemblies, and precision guiding systems where dimensional stability and wear resistance are paramount for operational efficiency.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit and precise shoulder diameter tolerance of -0.004" to -0.002" for consistent performance. The shoulder length maintains tight control within -0.005" to 0.005" tolerance. This shoulder screw complies with ASME B18.3 specifications and meets material requirements per ASTM A574. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring suitability for global industrial applications with strict regulatory requirements.