S-90298A850 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 for long-lasting performance in harsh environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty load-bearing applications.
• Precision alignment and smooth rotation ensured by the 3/4" shoulder diameter with a tight tolerance of -0.001" to 0.001" for reduced wear and vibration.
• High-accuracy thread engagement with Class 3A UNC coarse threads providing secure, reliable fastening and easy assembly.
• Secure, non-slip installation thanks to the hex socket drive and knurled head, allowing for high-torque application without tool slippage.
• Extended service life in precision assemblies with a generous 3 3/4" shoulder length that maintains part spacing and alignment under stress.
• Compliance with global standards including ASME B18.3, RoHS, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical alignment and durability challenges in demanding industrial settings. Manufactured from 18-8 stainless steel with a passivated finish, it resists corrosion and chemical exposure, making it ideal for machinery, automotive, and food processing equipment. The 3/4" shoulder diameter with minimal tolerance provides a precise bearing surface, reducing eccentric loads and preventing part misalignment. Combined with a Class 3A thread fit and coarse UNC threads, it ensures quick, secure fastening in high-vibration environments. The socket head with hex drive and knurled texture facilitates easy installation in confined spaces, enhancing assembly efficiency and reducing downtime.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit per UNC standards with a thread size of 5/8"-11. The shoulder diameter tolerance is -0.001" to 0.001", and shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use.