S-90337A153 2-56 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish for extended service life in harsh environments
• Precise component alignment ensured by the smooth shoulder with tight diameter tolerance (-0.001" to 0") and length tolerance (0" to 0.002")
• Reliable 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 requiring only 5/64" hex drive for installations with limited clearance
• Consistent thread engagement through Class 2A UNC coarse threads providing secure fastening in right-hand direction
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for global manufacturing requirements
• Optimized drive efficiency with hex socket design preventing cam-out and ensuring proper torque transmission

Professional Applications & Engineering Value

This precision 2-56 UNC shoulder screw solves critical alignment challenges in industrial machinery, precision instruments, and mechanical assemblies where component positioning accuracy is paramount. The 18-8 Stainless Steel material with passivated finish provides exceptional resistance to corrosion and chemical exposure, making it ideal for medical devices, food processing equipment, and outdoor applications. The low profile socket head design allows for compact installations while maintaining full 5/64" hex drive functionality. Engineers benefit from the precisely machined shoulder that acts as a positive stop and bearing surface, eliminating the need for additional spacers or washers in precision shoulder fit applications. The combination of 70,000 psi tensile strength and controlled Class 2A thread fit ensures reliable performance in high-vibration environments while maintaining disassembly capability for maintenance and repairs.

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". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility. The right-hand UNC coarse threads provide optimal engagement while the Rockwell B55 hardness rating guarantees durability under mechanical stress. All dimensional specifications adhere to industrial fastener standards for consistent performance across applications.