S-90337A161 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance through 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Precise component alignment with accurately machined 1/8" shoulder diameter and controlled tolerances for secure assembly fit
• High strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Space-saving low profile design with socket head configuration allowing installation in confined spaces
• Reliable thread engagement with Class 2A UNC coarse threads providing secure fastening in various materials
• Easy installation and maintenance using standard 5/64" hex drive tools for efficient assembly operations
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for global manufacturing requirements

Professional Applications & Engineering Value

This precision 4-40 UNC shoulder screw with low profile socket head design addresses critical engineering challenges in industrial assembly. The 18-8 stainless steel construction combined with passivated finish provides exceptional corrosion resistance, making it ideal for applications exposed to moisture, chemicals, or outdoor elements. The precisely machined shoulder with diameter of 1/8" and length of 1/16" ensures accurate component positioning and alignment in machinery, automation systems, and precision instruments. The Class 2A thread fit with UNC coarse threading offers reliable engagement in various materials while the 70,000 psi tensile strength maintains structural integrity under vibration and load conditions. These features make it particularly valuable for industrial applications requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

This shoulder screw maintains Class 2A thread fit per UNC standards with precise shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". Manufactured from 18-8 stainless steel with passivated finish, it delivers consistent performance with Rockwell B55 hardness and 70,000 psi tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial and commercial applications worldwide.