S-98637A401 1/4"-20 x 1/4" MS51963-63 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for tight, secure fastening in demanding applications
• Superior corrosion resistance due to cadmium-plated alloy steel construction, extending service life in harsh environments
• Enhanced grip and minimal surface damage from the cup point design, providing reliable component positioning
• High durability and wear resistance with Rockwell C45 hardness, ensuring long-term performance under stress
• Easy installation and removal using a standard 1/8" hex drive, compatible with common industrial tools
• Reliable performance in high-vibration settings thanks to coarse UNC threads and right-hand thread direction
• Guaranteed compliance and interchangeability by meeting MS51963-63 specifications for consistent quality

Professional Applications & Engineering Value

This 1/4"-20 UNC Class 3A set screw is engineered to address common industrial challenges such as component slippage and fastener failure in high-stress assemblies. The cadmium-plated alloy steel provides excellent corrosion protection, making it suitable for machinery, automotive, and aerospace applications exposed to moisture or chemicals. Its cup point design bites securely into shafts and collars without excessive marring, ensuring precise alignment and reducing maintenance needs. With a coarse thread and Class 3A fit, it offers quick assembly and reliable retention in vibrating environments, while the headless style allows for flush mounting in confined spaces. Ideal for securing gears, pulleys, and knobs, this set screw delivers consistent performance where industrial set screws are critical for operational safety and efficiency.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, including 1/4"-20 UNC coarse threads with a Class 3A thread fit for superior tolerance control. It meets MS51963-63 specifications, ensuring compatibility and reliability in regulated industries. Manufactured from alloy steel with a cadmium plating finish, it complies with common industrial requirements for durability and environmental resistance, though specific RoHS or REACH status should be verified per batch. The Rockwell C45 hardness and consistent thread geometry support its use in applications demanding high strength and repeatable performance.