S-99607A106 4-40 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extending service life.
• Superior grip and easy manual operation thanks to the knurled round head design, reducing tool dependency and speeding up assembly.
• High tensile strength of 80,000 psi ensures reliable fastening under stress, minimizing the risk of failure in demanding applications.
• Precise Class 2A thread fit with 4-40 UNC coarse threading for smooth engagement and consistent performance in various materials.
• Fully threaded shank provides maximum holding power along the entire length, enhancing stability in adjustable or frequently accessed components.
• Flared collar profile offers improved load distribution and prevents over-tightening, protecting sensitive surfaces.
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and meets global standards for industrial use.

Professional Applications & Engineering Value

This 4-40 UNC thumb screw in 18-8 stainless steel addresses common challenges in industrial settings, such as frequent adjustments and exposure to corrosive elements. The knurled head ensures a secure grip even with gloves, reducing slippage and improving efficiency in assembly lines or maintenance tasks. Its coarse threading and Class 2A fit facilitate quick installation in metals and plastics, while the fully threaded design offers versatile clamping force for electronics, machinery, and enclosures. The flared collar adds structural support, distributing pressure evenly to prevent damage. Ideal for applications requiring manual access without tools, this screw combines durability with user-friendly operation, making it a reliable choice for engineers seeking long-term performance in regulated environments.

Specification Summary & Compliance

This thumb screw features precise UNC coarse threads with a Class 2A fit for standard dimensional accuracy, measuring 3/8" in length and 0.112" in thread diameter. Manufactured from 18-8 stainless steel with a hardness of Rockwell B85, it adheres to industry standards for strength and corrosion resistance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial fasteners.