S-91746A836 4-40 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual operation with a knurled round head for secure grip and quick adjustments without tools
• Superior corrosion resistance from 18-8 stainless steel, ideal for harsh or humid environments
• High tensile strength of 80,000 psi ensures reliable fastening under mechanical stress
• Precision Class 2A thread fit with 4-40 UNC coarse threads for smooth engagement and reduced cross-threading
• Partially threaded design allows for controlled clamping force and secure positioning in assemblies
• Compliance with RoHS 3 and REACH guarantees environmental safety and regulatory adherence
• Rockwell B85 hardness provides excellent durability and wear resistance for repeated use

Professional Applications & Engineering Value

This 4-40 UNC thumb screw in 18-8 stainless steel is engineered to address common industrial challenges such as frequent adjustments and exposure to corrosive elements. The knurled head offers enhanced grip, reducing slippage and improving efficiency in manual fastening applications like electronic enclosures, machinery panels, and instrumentation. With its coarse UNC threads and Class 2A fit, it ensures quick, reliable installation while minimizing the risk of thread damage. The partially threaded shank provides optimal clamping control, making it a versatile choice for maintenance and assembly lines where speed and reliability are critical.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a 4-40 thread size and Class 2A thread fit for precise dimensional accuracy. It is manufactured from 18-8 stainless steel, achieving a hardness of Rockwell B85 and tensile strength of 80,000 psi. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.