S-90079A668 1/2"-13 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with a knurled thumb head for superior grip and torque application without tools
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration
• Rockwell B84 hardness provides excellent wear resistance and durability in demanding environments
• Coarse UNC thread and Class 2A fit enable quick assembly and secure fastening in various materials
• Extended tip design facilitates easier alignment and insertion in blind or pre-tapped holes
• Black-oxide steel finish offers corrosion resistance and a professional appearance
• Partially threaded shank allows for precise clamping force control and reduced thread wear

Professional Applications & Engineering Value

This 1/2"-13 UNC thumb screw is engineered for industrial applications where manual adjustment and high-strength fastening are critical. The black-oxide steel construction and Rockwell B84 hardness ensure long-term reliability in machinery, equipment panels, and fixtures, resisting wear and environmental exposure. The knurled head provides a secure grip, even with oily hands, reducing installation time and improving safety. Its coarse thread and extended tip simplify alignment in assembly lines, minimizing cross-threading risks. Ideal for maintenance access panels, clamping devices, and adjustable components, this screw delivers consistent performance where tool-free operation and 70,000 psi tensile strength are essential for operational efficiency.

Specification Summary & Compliance

This thumb screw features a 1/2"-13 UNC thread with Class 2A fit for standard tolerance and easy assembly. It is manufactured from steel with a black-oxide surface finish and complies with RoHS 3 (2015/863/EU) under exemption 6(a)-I for lead as an alloying element, and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.