S-91746A977 1/4"-28 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Excellent grip and tool-free operation thanks to the knurled round head design
• Precise and reliable fastening ensured by the Class 2A fine thread fit for minimal play
• High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for demanding applications
• Maximum thread engagement from the fully threaded design, providing superior holding power
• Compliance with global standards including RoHS 3 and REACH for safe use in regulated industries
• Versatile installation options with both thumb operation and slotted drive compatibility

Professional Applications & Engineering Value

This 1/4"-28 UNF thumb screw delivers exceptional engineering value in applications requiring frequent adjustments and reliable clamping force. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for electronics enclosures, machinery panels, and laboratory equipment. The knurled head texture offers a secure, non-slip grip even with gloved hands, while the fine UNF threading ensures precise positioning and vibration resistance. Its fully threaded design and Class 2A thread fit guarantee consistent performance in assembly lines and maintenance operations, reducing installation time and improving operational efficiency.

Specification Summary & Compliance

This thumb screw features a 1/4"-28 UNF thread with Class 2A thread fit for precise dimensional accuracy. It is manufactured from 18-8 stainless steel with a tensile strength of 80,000 psi and Rockwell B83 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency for industrial use.