S-93985A511 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 416 stainless steel construction for long-lasting performance in demanding industrial environments
• Precise component alignment ensured by the exact 1/8" shoulder diameter with tight tolerance control for reduced assembly errors
• High-strength reliability delivering 120,000 psi tensile strength and Rockwell C26 hardness for heavy-duty mechanical applications
• Effortless installation and removal with the hex socket drive design providing secure tool engagement and preventing stripping
• Consistent thread performance through Class 2A UNC coarse threads offering reliable fastening in various materials
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Optimized for automated assembly with right-hand thread direction and smooth head texture enabling efficient high-volume production

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw delivers critical engineering value in precision assemblies where component alignment is paramount. The 416 stainless steel construction provides excellent corrosion resistance while maintaining the Rockwell C26 hardness needed for repeated use in mechanical systems. The precisely machined 1/8" shoulder diameter with controlled tolerance ensures accurate positioning of gears, pulleys, and rotating components, eliminating the need for additional alignment fixtures. The hex socket drive allows for high-torque installation in confined spaces, while the Class 2A thread fit guarantees consistent engagement in both metallic and composite materials. These shoulder screws are engineered to solve alignment and wear problems in robotics, precision machinery, and automotive assemblies where dimensional stability under load is critical.

Specification Summary & Compliance

This shoulder screw features 4-40 UNC coarse threads with Class 2A thread fit per standard inch system requirements. The shoulder maintains precise dimensional control with diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restriction of hazardous substances. The mechanical properties include 120,000 psi tensile strength and Rockwell C26 hardness, providing reliable performance in industrial applications requiring precise component positioning and durability.