S-90337A162 4-40 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 environments
• Precise component alignment through controlled shoulder diameter (1/8") and length tolerances, minimizing assembly play
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications
• Space-saving low-profile design with socket head and 5/64" hex drive, ideal for confined assembly spaces
• Reliable thread engagement with Class 2A UNC coarse threads providing secure fastening in various materials
• Environmental compliance assurance meeting RoHS 3 and REACH standards for sustainable manufacturing
• Optimized drive efficiency through hex socket design enabling high torque application without cam-out

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw solves critical alignment challenges in precision assemblies where component positioning is paramount. The 18-8 Stainless Steel construction with passivated finish provides exceptional corrosion resistance for industrial environments exposed to moisture, chemicals, or temperature variations. The low-profile socket head design allows installation in tight spaces while maintaining full torque capability through the 5/64" hex drive. Engineers specify these precision shoulder screws for applications requiring exact radial positioning of moving components, such as in robotics, automation equipment, precision instruments, and mechanical assemblies where the precisely machined shoulder serves as a bearing surface or pivot point. The Class 2A thread fit ensures consistent engagement while the coarse thread spacing facilitates quicker assembly in production environments.

Specification Summary & Compliance

This shoulder screw maintains Class 2A thread fit per UNC standards with precise shoulder diameter tolerance (-0.001" to 0") and shoulder length tolerance (0" to 0.002") for exacting assembly requirements. Manufacturing follows inch system specifications with 4-40 UNC coarse threads, right-hand thread direction, and smooth head texture. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international substance restriction standards for industrial applications.