S-98637A111 4-40 x 1/4" MS51963-11 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 provided by Class 3A thread fit ensuring precise, secure fastening with minimal backlash
• High-strength durability from alloy steel construction with Rockwell C45 hardness for reliable performance under heavy loads
• Easy installation and removal with hex drive design requiring only 0.050" tool access in confined spaces
• Optimal grip and positioning with cup tip design that creates positive engagement and prevents component slippage
• Wide compatibility with coarse UNC threads and right-hand direction meeting most industrial assembly requirements
• Verified quality assurance through compliance with MS51963-11 specifications for consistent performance

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers critical engineering solutions for precision assemblies requiring reliable component positioning. The cadmium-plated alloy steel construction provides essential corrosion protection while maintaining Rockwell C45 hardness for durable performance in vibrating environments. The headless hex drive design with 0.050" drive size enables installation in tight spaces where conventional fasteners cannot access. The Class 3A thread fit ensures precise engagement with mating components, eliminating play in precision machinery, while the cup tip creates concentrated pressure points for secure shaft and collar applications. Meeting MS51963-11 specifications, this coarse thread set screw provides consistent performance in automotive, aerospace, and industrial equipment where vibration resistance and positional accuracy are paramount.

Specification Summary & Compliance

This inch-system fastener features precise 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. The 1/4" length and 0.112" thread diameter provide standardized sizing compatibility. Manufacturing complies with MS51963-11 specifications, ensuring consistent quality and performance. The cadmium plating offers environmental protection while the alloy steel material with Rockwell C45 hardness guarantees mechanical reliability. The fastener meets industry standards for right-hand threaded applications and is suitable for various industrial compliance requirements.