S-90298A835 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, ensuring long-term reliability in harsh industrial environments.
• Precise alignment and reduced wear due to the Class 3A thread fit and tight shoulder diameter tolerance (±0.001"), providing consistent performance in rotating assemblies.
• High tensile strength of 70,000 psi and Rockwell B55 hardness for reliable load-bearing capacity in demanding applications.
• Secure installation and removal with the 3/8" hex socket drive and knurled head, offering excellent grip and torque transmission.
• Optimized for coarse threading (UNC) to facilitate quick assembly and disassembly while maintaining strong holding power.
• Compliance with ASME B18.3 standards ensures dimensional accuracy and interchangeability, reducing procurement risks.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This precision 5/8"-11 UNC shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, automation systems, and precision equipment. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to corrosion and oxidation, extending service life in moist or chemically aggressive environments. The Class 3A thread fit and tightly controlled shoulder dimensions (±0.001" diameter tolerance) ensure minimal backlash and precise component positioning, reducing wear on mating parts. The knurled head and hex socket drive allow for secure handling and high-torque installation, making it ideal for applications requiring frequent adjustments or maintenance. Commonly used in pivoting mechanisms, bearing mounts, and robotic arms, this shoulder screw delivers reliable performance where rotational accuracy and structural integrity are paramount.

Specification Summary & Compliance

This shoulder screw features a 5/8"-11 UNC coarse thread with Class 3A fit for precise engagement, a shoulder diameter of 3/4" (±0.001" tolerance), and a thread length of 7/8". Manufactured in accordance with ASME B18.3 specifications, it guarantees dimensional consistency and mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across various industries.