S-90079A589 5/16"-18 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior grip and torque application with knurled head texture for reliable hand-tightening without tools
• Exceptional durability and corrosion resistance thanks to black-oxide steel construction
• High tensile strength (180,000 psi) ensures secure fastening in demanding industrial environments
• Easy installation in tight spaces with low-profile round head design
• Quick assembly with coarse UNC threading for faster engagement and reduced cross-threading risk
• Precise thread fit (Class 2A) guarantees consistent performance and compatibility
• Extended tip design facilitates easier alignment and initial threading

Professional Applications & Engineering Value

This black-oxide steel thumb screw delivers exceptional value in industrial settings where frequent adjustments and reliable fastening are critical. The knurled low-profile head provides superior grip even with oily hands or gloves, eliminating the need for tools in maintenance-heavy applications. With 180,000 psi tensile strength and Rockwell C40 hardness, it withstands repeated use in machinery, electrical enclosures, and assembly jigs. The coarse UNC threading and Class 2A thread fit ensure quick installation and vibration resistance, while the partially threaded design with extended tip simplifies alignment in blind holes. Ideal for equipment requiring regular access panels, calibration points, or modular components.

Specification Summary & Compliance

This thumb screw features 5/16"-18 UNC coarse threading with Class 2A thread fit for precision tolerance. Manufactured from black-oxide steel with dimensions of 2 1/2" length, 1 1/8" head diameter, and 2 1/16" thread length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.