S-91746A019 4-40 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Excellent manual grip and torque application thanks to the fully knurled round head design
• High mechanical strength and durability with 80,000 psi tensile strength and Rockwell B83 hardness
• Reliable and precise thread engagement ensured by Class 2A fit and coarse UNC 4-40 threading
• Quick and tool-free installation with the convenient thumb-operated narrow profile head
• Full-length threading for maximum adjustability and secure fastening across the entire 3/8" length
• Compliance with strict environmental regulations including RoHS 3 and REACH standards

Professional Applications & Engineering Value

This 4-40 UNC thumb screw in 18-8 stainless steel provides a robust fastening solution for applications requiring frequent adjustments and high reliability. The knurled round head offers exceptional manual grip, reducing slippage and enabling quick assembly without tools—ideal for panels, access covers, and electronic enclosures. Its coarse thread and Class 2A fit ensure smooth engagement and resistance to cross-threading, while the fully threaded design allows for consistent clamping force. With high tensile strength and corrosion resistance, this screw is suited for industrial, automotive, and electronic assemblies where durability and compliance with RoHS and REACH 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 and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and suitability for regulated industries.