S-98637A123 4-40 x 1/2" MS51963-15 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance through cadmium-plated alloy steel construction for extended service life in harsh environments
• Exceptional holding power with Class 3A thread fit ensuring precise, vibration-resistant fastening in critical assemblies
• High-strength performance backed by Rockwell C45 hardness for reliable operation under heavy mechanical stress
• Easy installation and removal with 0.050" hex drive design allowing secure tool engagement in confined spaces
• Optimized grip and positioning through cup tip design that creates consistent pressure points on contact surfaces
• Reliable coarse threading with 4-40 UNC specification providing excellent resistance to loosening in dynamic applications
• Military-grade quality assurance meeting MS51963-15 specifications for consistent performance in demanding industrial settings

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers critical engineering solutions where space constraints and vibration resistance are paramount. The headless design with hex drive enables flush mounting in precision equipment while maintaining accessibility for maintenance. Manufactured from cadmium-plated alloy steel, it provides essential corrosion protection for industrial machinery, automotive components, and electronic enclosures exposed to moisture or chemicals. The Class 3A thread fit ensures minimal backlash in precision assemblies, while the cup tip configuration creates concentrated clamping force for secure shaft collars, gears, and pulley retention. These set screws are engineered to maintain positional integrity in high-vibration environments where loosening could cause equipment failure or safety hazards.

Specification Summary & Compliance

This precision fastener features 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and engagement. The 1/2" length provides optimal engagement depth for various applications. Manufactured to meet MS51963-15 military specifications, these set screws comply with rigorous quality standards for industrial fasteners. The cadmium plating offers corrosion protection while maintaining electrical conductivity. With right-hand threading and 0.050" hex drive, this component delivers reliable performance in accordance with established industrial fastening protocols.