S-91259A857 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications
• Enhanced corrosion resistance through black oxide finish, extending service life in demanding industrial environments
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized material strength from alloy steel with Rockwell C32 hardness for excellent durability and wear resistance
• Secure installation and removal with 3/8" hex drive and knurled head providing superior grip and torque transmission
• Accurate component alignment through precisely machined shoulder with tight diameter and length tolerances
• 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 exceptional engineering value in precision machinery and heavy-duty equipment applications. The black oxide finish provides crucial corrosion protection while maintaining dimensional stability in challenging environments. Engineered with Class 3A thread fit and UNC coarse threads, this fastener ensures reliable performance in assemblies requiring precise component positioning and alignment. The knurled socket head with 3/8" hex drive facilitates secure installation in confined spaces, while the precisely machined shoulder maintains accurate spacing between components. Ideal for rotating assemblies, pivoting mechanisms, and precision guiding systems, this shoulder screw solves critical alignment and wear challenges in manufacturing, automation, and heavy equipment sectors.

Specification Summary & Compliance

This 5/8"-11 UNC shoulder screw features precision Class 3A thread fit with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, the screw meets rigorous quality standards. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications while maintaining exceptional mechanical properties including 140,000 psi tensile strength and Rockwell C32 hardness.