S-91259A535 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
• Enhanced corrosion resistance through black oxide finish, extending service life in various industrial environments
• Precise shoulder positioning with 1/4" diameter and 3/8" length shoulder for accurate component alignment and spacing
• Superior thread reliability with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized installation efficiency featuring hex socket drive and knurled head for non-slip tool engagement and easy assembly
• Consistent mechanical properties with Rockwell C32 hardness providing durable wear resistance and dimensional stability
• Broad compliance coverage meeting ASME B18.3 specifications while being RoHS 3 and REACH compliant for global applications

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions where precise component positioning and high strength are paramount. The 10-24 UNC Class 3A thread with coarse pitch provides excellent engagement in various materials while resisting loosening under vibration. The black oxide finish offers substantial corrosion protection without dimensional interference, making it ideal for precision machinery, automation systems, and industrial equipment. The 3/8" shoulder length and 1/4" shoulder diameter create reliable bearing surfaces for rotating components, linkages, and alignment fixtures. With its hex socket drive and knurled head, installation becomes straightforward even in confined spaces, reducing assembly time while maintaining precise shoulder positioning critical for manufacturing accuracy and reduced maintenance cycles.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit and shoulder diameter tolerance of -0.004" to -0.002" for precision assembly. The UNC coarse thread specification ensures compatibility with standard components while the shoulder length maintains -0.005" to 0.005" tolerance. Full compliance with ASME B18.3 manufacturing specifications, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) regulations ensures global acceptability for industrial applications requiring certified components.