S-93996A526 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with integrated nylon patch thread locker maintains secure fastening in temperatures from -70° to 250°F, preventing loosening in dynamic applications
• Exceptional corrosion resistance through 18-8 stainless steel construction ensures long-term reliability in harsh industrial environments
• Precise component alignment with controlled shoulder diameter tolerance (-0.001" to 0") and length tolerance (0" to 0.002") for accurate assembly positioning
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness withstands heavy operational loads
• Easy installation and removal via standard 5/64" hex socket drive for efficient maintenance and assembly operations
• Reliable thread engagement with Class 2A UNC coarse threads provides consistent fastening performance
• Regulatory compliance with RoHS 3 and REACH standards ensures environmental responsibility and global market acceptance

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw delivers critical engineering solutions where precise component alignment and vibration resistance are paramount. The 18-8 stainless steel construction combined with Rockwell B55 hardness provides exceptional durability in machinery, automation systems, and precision instruments. The integrated nylon patch thread locker effectively prevents spontaneous loosening caused by vibration or thermal cycling, making it ideal for rotating assemblies, motor mounts, and robotic components. The precise shoulder fit with controlled diameter and length tolerances ensures accurate bearing and gear positioning, eliminating misalignment issues in high-precision applications while maintaining 70,000 psi tensile strength for demanding mechanical fastening requirements.

Specification Summary & Compliance

Manufactured to exacting standards, this shoulder screw features Class 2A thread fit with UNC coarse threads (4-40) and precise shoulder dimensions (diameter: 1/8" with -0.001" to 0" tolerance, length: 3/8" with 0" to 0.002" tolerance). The component fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance for industrial applications.