S-93996A528 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant secure fastening with integrated nylon patch thread locker that maintains performance across a wide temperature range from -70° to 250°F
• Exceptional corrosion resistance through 18-8 stainless steel construction, ideal for harsh industrial environments and demanding applications
• Precision alignment and positioning with Class 2A thread fit and precisely machined 1/8" shoulder diameter ensuring accurate component mounting
• High strength reliability delivering 70,000 psi tensile strength and Rockwell B55 hardness for durable performance in demanding mechanical assemblies
• Easy installation and maintenance with standard hex socket drive (5/64") allowing for secure tool engagement and simplified servicing
• Industry-standard compatibility featuring 4-40 UNC coarse threads and right-hand threading for seamless integration with existing equipment and components
• Regulatory compliance assurance meeting RoHS 3 and REACH environmental standards for global industrial applications

Professional Applications & Engineering Value

This precision 4-40 UNC shoulder screw delivers critical engineering solutions for applications requiring secure positioning and vibration resistance. The 18-8 stainless steel construction provides excellent corrosion resistance while maintaining 70,000 psi tensile strength, making it ideal for machinery, automation systems, and precision instruments. The integrated nylon patch thread locker ensures reliable fastening in high-vibration environments without compromising the Class 2A thread fit precision. The precisely machined 1/8" shoulder diameter allows for accurate component alignment in assemblies where rotational movement or precise spacing is critical. These shoulder screws are particularly valuable in manufacturing equipment, robotic systems, and electronic enclosures where vibration-resistant fastening and dimensional accuracy are paramount for long-term operational reliability.

Specification Summary & Compliance

This shoulder screw features Class 2A thread fit with 4-40 UNC coarse threads and precise shoulder dimensions (1/8" diameter with -0.001" to 0" tolerance). Manufactured from 18-8 stainless steel with Rockwell B55 hardness and 70,000 psi tensile strength. The fastener complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring restricted substance compliance.