S-90298A843 5/8"-11 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
• Exceptional strength and durability with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications.
• Precise alignment and smooth rotation thanks to the 3/4" shoulder diameter with tight ±0.001" tolerance.
• Reliable thread engagement with Class 3A fit and coarse 5/8"-11 UNC threads for secure fastening in high-vibration settings.
• Easy installation and removal using the 3/8" hex socket drive and knurled head for improved grip.
• Long-lasting performance in automation and machinery due to compliance with ASME B18.3, RoHS 3, and REACH standards.
• Accurate component positioning with a 2" shoulder length and minimal tolerance, reducing assembly errors.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical challenges in precision assemblies, such as misalignment and wear in industrial machinery and automation systems. Made from 18-8 stainless steel with a passivated finish, it resists corrosion and extends service life in demanding conditions. The coarse thread and Class 3A thread fit ensure quick, secure fastening, while the precisely machined shoulder—with diameters held to ±0.001"—provides stable bearing surfaces for rotating parts like gears and linkages. This reduces downtime and maintenance costs, making it a reliable choice for heavy-duty assemblies where strength and accuracy are paramount.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision. Dimensions include a 3/4" shoulder diameter (±0.001" tolerance) and 2" shoulder length (±0.005" tolerance). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for global industrial use.