S-90298A876 5/8"-11 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength offering a 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance in high-stress applications.
• Precise alignment and smooth rotation ensured by the 3/4" shoulder diameter with tight tolerances, reducing wear on mating components.
• Secure and easy installation with a 3/8" hex socket drive and knurled head for superior grip and torque application without slippage.
• High-accuracy thread engagement with a Class 3A UNC coarse thread fit, providing a secure, vibration-resistant connection.
• Long-lasting durability backed by Rockwell B55 hardness, maintaining structural integrity under repetitive loads.
• Guaranteed compliance and safety meeting ASME B18.3 specifications and being RoHS 3 & REACH compliant for global industrial use.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical alignment and pivot point requirements in demanding machinery. The 8-inch shoulder length provides a stable, unthreaded bearing surface that prevents axial movement and minimizes wear in assemblies like conveyor systems, robotic arms, and printing equipment. Manufactured from 18-8 Stainless Steel, it resists rust and corrosion in moist or chemical-exposed environments, reducing maintenance downtime. The Class 3A thread fit and coarse thread design ensure quick assembly and high resistance to loosening under vibration. Combined with a knurled socket head for non-slip tool engagement, this screw delivers reliable performance in industrial automation and heavy-duty applications, enhancing operational efficiency and equipment longevity.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 standards, with a Class 3A thread fit for precise UNC threading. The shoulder diameter is 3/4" with a tolerance of -0.004" to -0.002", and the shoulder length is 8" with a tolerance of -0.005" to 0.005", ensuring exact dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free from hazardous substances for safe use in various industrial sectors.