S-91882A442 5/16"-18 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with a large 1 1/4" diameter knurled round head for superior grip and tool-free tightening in confined spaces.
• Exceptional durability and corrosion resistance provided by the black-oxide steel finish, extending service life in demanding industrial environments.
• High mechanical strength with a 70,000 psi tensile strength and Rockwell B84 hardness, ensuring reliable performance under heavy loads.
• Secure and precise fastening with a Class 2A thread fit and coarse UNC thread, enabling quick assembly and vibration resistance.
• Full-thread engagement along the 1 1/4" length for maximum holding power and stability in various material thicknesses.
• Wide compatibility with standard 5/16"-18 UNC components, simplifying sourcing and replacement in existing systems.
• Compliance with environmental and safety standards including RoHS 3 and REACH, ensuring suitability for regulated industries.

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to address common challenges in industrial maintenance, machinery, and electronic enclosures where frequent adjustments are required. The knurled round head and raised profile offer an ergonomic design that prevents slippage, reducing hand fatigue and improving operational efficiency without specialized tools. Made from high-strength steel with a Rockwell B84 hardness, it withstands repetitive use and mechanical stress, while the coarse UNC thread and Class 2A fit ensure quick, secure installation in metals and plastics, minimizing cross-threading risks. Its fully threaded 1 1/4" length provides consistent clamping force, making it ideal for applications in assembly jigs, access panels, and adjustable components where reliability and ease of use are critical.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a 5/16"-18 size and Class 2A thread fit for precise dimensional accuracy. It is manufactured from black-oxide steel with a tensile strength of 70,000 psi and hardness of Rockwell B84. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a)-I and REACH (EC 1907/2006), meeting environmental regulations for industrial use.