S-97705A226 4-40 x 1/8" QQ-P-35, MS51021-9 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Maximum holding power through the cup point design that bites securely into mating surfaces
• Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
• Efficient torque transmission via the 0.050" hex drive, allowing for easy installation with standard tools
• Space-saving headless design ideal for applications where flush mounting is required
• Wide compatibility with UNC coarse threads for quick assembly in various industrial components
• Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers exceptional engineering value in precision assemblies where space constraints and reliable torque transmission are critical. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for applications exposed to moisture or chemicals, while the cup point design ensures firm gripping on shafts, gears, and pulleys to prevent slippage under dynamic loads. Its hex drive enables high torque application without stripping, and the Class 3A thread fit maintains tight tolerances for secure fastening in machinery, electronics, and automotive systems. Ideal for OEM and maintenance use, this screw addresses common challenges like vibration loosening and alignment issues in industrial set screws applications.

Specification Summary & Compliance

This set screw features a 4-40 UNC thread with Class 3A thread fit for precise dimensional accuracy and coarse thread spacing. It complies with Fed. Spec. QQ-P-35 (referencing MS51021-9) for manufacturing consistency, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and reliability in demanding industrial environments.