S-90337A164 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with 18-8 Stainless Steel and passivated finish for longevity in harsh industrial environments.
• Precise component alignment due to the exact 1/8" shoulder diameter and controlled tolerance for reliable assembly.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
• Space-saving low-profile design with a smooth socket head for flush mounting in compact assemblies.
• Secure and efficient installation using a standard 5/64" hex drive, reducing slippage and tool wear.
• Consistent thread engagement with UNC coarse threads and Class 2A fit for quick, reliable fastening.
• Compliance with global standards including RoHS 3 and REACH, ensuring safe and sustainable use.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and space constraints in precision machinery. Made from 18-8 Stainless Steel with a passivated finish, it resists corrosion and wear in environments like automation systems, electronic enclosures, and medical devices. The low profile socket head and 1/8" shoulder diameter provide a secure pivot or bearing surface, minimizing assembly height while maintaining structural integrity. Its Class 2A thread fit and coarse UNC thread ensure rapid installation and vibration resistance, reducing maintenance downtime and improving operational reliability in industrial shoulder screw applications.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. The shoulder features precise tolerances: diameter of 1/8" (-0.001" to 0") and length of 5/32" (0" to 0.002"). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for global industrial use.