S-93985A513 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 416 stainless steel construction for long-lasting performance in harsh industrial environments
• Precise component alignment through controlled shoulder diameter and length tolerances ensuring reliable assembly fit
• High-strength performance with 120,000 psi tensile strength and Rockwell C26 hardness for demanding applications
• Secure hex drive engagement providing maximum torque transfer and reduced stripping risk during installation
• Consistent thread quality with Class 2A UNC coarse threads ensuring reliable mating and vibration resistance
• Environmental compliance meeting RoHS 3 and REACH regulations for global manufacturing applications
• Smooth head profile allowing flush mounting while maintaining structural integrity under load

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw delivers exceptional engineering value in precision assembly applications where component alignment and dimensional stability are critical. The 416 stainless steel construction provides excellent corrosion resistance while maintaining the Rockwell C26 hardness required for repeated assembly cycles. The precisely controlled shoulder diameter and length tolerances ensure consistent spacing between components in machinery, automation systems, and precision instruments. The hex drive design allows for high-torque installation without compromising the socket integrity, while the Class 2A thread fit guarantees reliable engagement in vibration-prone environments. These shoulder screws are particularly valuable in applications requiring precise rotational clearance or acting as axles, pivots, or guides in mechanical assemblies.

Specification Summary & Compliance

This precision fastener features Class 2A thread fit with UNC coarse thread spacing, ensuring consistent performance across industrial applications. The shoulder diameter maintains tight tolerances from -0.001" to 0", while shoulder length is controlled within 0" to 0.002" for precise component alignment. Manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, this shoulder screw is suitable for global manufacturing requirements. The combination of 416 stainless steel material with specific hardness and tensile strength specifications ensures reliable performance in demanding mechanical applications.