S-90298A853 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.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads.
• Precise assembly and alignment ensured by the Class 3A thread fit and standard shoulder fit, reducing installation errors.
• Secure, non-slip fastening provided by the knurled head and 3/8" hex drive, allowing for high-torque application.
• Robust dimensional stability with tight shoulder diameter and length tolerances for consistent performance in precision machinery.
• Wide industry compatibility through compliance with ASME B18.3, RoHS 3, and REACH standards, ensuring safety and regulatory adherence.
• Optimized for coarse-thread applications with 5/8"-11 UNC threads, offering quick assembly and high resistance to vibration loosening.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical challenges in high-stakes industrial settings, such as machinery assembly, automotive systems, and precision equipment. The passivated finish significantly enhances corrosion resistance, extending service life in moist or chemically aggressive environments. Its Class 3A thread fit and precisely machined shoulder—with tolerances as tight as ±0.001" in diameter—ensure exact alignment and reduce wear in rotating components. The knurled head and hex drive design facilitate secure installation, minimizing the risk of slippage during high-torque fastening. Ideal for applications demanding dimensional stability and heavy-duty performance, this screw supports efficient maintenance and reduces downtime in industrial shoulder bolt applications.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNC coarse thread standards, with a shoulder diameter tolerance of -0.001" to 0.001" and length tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and suitable for global industrial use.