S-93996A116 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker maintains secure fastening in temperatures from -70° to 250°F, preventing loosening in dynamic industrial environments.
• Exceptional corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh conditions while maintaining structural integrity.
• Precision shoulder alignment with 1/8" diameter and 1/4" length provides accurate component positioning and smooth rotational movement in assemblies.
• High-strength performance delivers 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
• Reliable thread engagement with Class 2A UNC coarse threads ensures consistent installation and optimal clamping force.
• Socket head design allows for high-torque installation in confined spaces while maintaining clean aesthetic appearance.
• Compliance assurance with RoHS 3 and REACH regulations makes these shoulder screws suitable for global industrial supply chains.

Professional Applications & Engineering Value

This precision 4-40 UNC shoulder screw addresses critical alignment and vibration challenges in industrial machinery and precision equipment. The 18-8 stainless steel construction provides excellent corrosion resistance for harsh environments, while the precisely machined 1/8" shoulder diameter and 1/4" shoulder length ensure accurate component positioning in assemblies requiring rotational movement or precise spacing. The integrated nylon patch locking technology effectively prevents loosening from vibration, a common failure point in dynamic applications. With 70,000 psi tensile strength and Rockwell B55 hardness, these socket head shoulder screws maintain integrity under substantial mechanical loads, making them ideal for precision instruments, automation equipment, and mechanical assemblies where reliability and dimensional accuracy are paramount.

Specification Summary & Compliance

This 4-40 UNC shoulder screw features Class 2A thread fit for consistent installation and optimal clamping force. The precision shoulder maintains tight tolerances with diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002". Manufactured from 18-8 stainless steel with right-hand coarse threads, the fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance for industrial applications.