S-98637A105 4-40 x 3/16" MS51963-10 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with cadmium plating that protects against rust and extends service life in harsh industrial environments
• Exceptional holding power achieved through Class 3A thread fit precision, ensuring tight, secure fastening without loosening
• High-strength durability from alloy steel construction with Rockwell C45 hardness, maintaining structural integrity under heavy loads
• Easy installation and removal with hex drive design requiring only 0.050" tool, saving time during assembly and maintenance
• Reliable positioning capability thanks to cup tip design that provides positive seating and prevents component slippage
• Wide compatibility with UNC coarse threading system, making it ideal for various industrial equipment and machinery
• Guaranteed quality assurance through compliance with MS51963-10 specifications, meeting rigorous aerospace and defense standards

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers critical engineering solutions for applications where vibration resistance and precise component positioning are paramount. The cadmium-plated alloy steel construction provides excellent corrosion protection while maintaining the Rockwell C45 hardness needed for high-stress environments. The headless hex drive design allows for flush mounting in confined spaces, making it ideal for precision instruments, aerospace components, and industrial machinery where protrusions are unacceptable. The Class 3A thread fit ensures consistent clamping force while the cup tip securely bites into shaft materials, preventing rotational slippage in pulley systems, gear assemblies, and coupling applications. This combination of features addresses common industrial challenges including vibration-induced loosening, corrosion degradation, and space constraints in complex assemblies.

Specification Summary & Compliance

This precision fastener features 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and tight tolerances. The 3/16" length and 0.050" hex drive provide consistent performance across applications. Manufactured to meet MS51963-10 specifications, this set screw complies with rigorous industrial standards for material quality, dimensional requirements, and performance characteristics. The cadmium plating meets environmental regulations while providing optimal corrosion protection for demanding operational conditions.