S-90298A836 5/8"-11 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise component alignment ensured by Class 3A thread fit and ±0.001" shoulder diameter tolerance for reduced assembly errors
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications
• Secure installation and removal via knurled socket head with 3/8" hex drive, preventing tool slippage under high torque
• Industry-standard compatibility with UNC coarse threads and ASME B18.3 specifications for reliable interchangeability
• Extended service life through robust material properties and surface treatment, minimizing wear in high-cycle operations
• Global regulatory compliance with RoHS 3 and REACH standards, ensuring safe use in international markets

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw delivers critical engineering value in precision assemblies where exact component positioning is paramount. The 18-8 stainless steel material with passivated finish provides excellent corrosion resistance, making it suitable for food processing, marine, and chemical equipment where moisture exposure is common. The Class 3A thread fit combined with the precisely machined shoulder (±0.001" diameter tolerance) eliminates play in rotating mechanisms, bearings, and pivoting joints, reducing vibration-induced failures. The knurled socket head with 3/8" hex drive ensures positive engagement during installation in confined spaces, while the coarse UNC threads facilitate quick assembly in production environments. These features make it ideal for robotics, automotive jigs, and industrial machinery requiring reliable alignment and repeated disassembly.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. Shoulder diameter tolerance maintained at -0.001" to 0.001" with shoulder length tolerance of -0.005" to 0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Thread system follows 5/8"-11 UNC coarse thread standards with right-hand thread direction.