S-91259A846 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black oxide finish for longer service life in demanding industrial environments
• Superior load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength for heavy-duty applications
• Precision alignment through Class 3A thread fit and controlled shoulder diameter tolerances for accurate component positioning
• Secure installation and removal with knurled socket head and 3/8" hex drive preventing tool slippage during torque application
• Extended service life from Rockwell C32 hardness providing excellent wear resistance in high-cycle applications
• Reliable performance meeting ASME B18.3 and ASTM A574 specifications for consistent quality and dimensional accuracy
• Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment where alignment accuracy and structural integrity are paramount. The alloy steel construction with black oxide finish provides exceptional corrosion protection while maintaining the dimensional stability required for rotating assemblies and pivot points. The coarse UNC thread design ensures rapid installation and secure fastening in high-vibration environments, while the 2 3/4" shoulder length with precise diameter control serves as an accurate locating surface for bearings, gears, and other rotating components. The socket head design with knurled texture combined with the 3/8" hex drive offers superior torque transmission, making this fastener ideal for automated assembly systems and maintenance applications where space constraints exist.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit for precision assembly with UNC 5/8"-11 coarse threads. Critical dimensions include shoulder diameter of 0.75" with tolerance of -0.004" to -0.002" and shoulder length of 2.75" with tolerance of -0.005" to 0.005". The fastener complies with ASME B18.3 specifications and ASTM A574 manufacturing standards, ensuring consistent quality and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for international industrial applications.