S-90181A568 1/4"-28 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with a wide spade head design, eliminating the need for tools in frequent adjustments.
• Superior durability and wear resistance due to the steel construction and Rockwell B55 hardness rating.
• High mechanical strength with a 40,000 psi tensile strength, ensuring reliable performance under load.
• Precise and secure fastening achieved with a fine UNF thread and Class 2A fit for minimal backlash.
• Maximum thread engagement from being fully threaded, providing consistent holding power along the entire 1" length.
• Optimized for industrial use with a right-hand thread direction, conforming to standard assembly practices.
• Convenient sizing with a 1/2" head height and 23/32" head width for a comfortable and secure grip.

Professional Applications & Engineering Value

This 1/4"-28 UNF thumb screw is engineered to solve critical challenges in assembly and maintenance where tool-less operation is essential. The steel material and robust spade head design provide exceptional grip and torque application, reducing installation time and preventing slippage. Its fine thread and Class 2A fit ensure precise alignment and vibration resistance in precision applications such as electronic enclosures, machinery panels, and optical equipment. The fully threaded body guarantees uniform stress distribution and a secure hold, making it an ideal industrial thumb screw for environments demanding both reliability and user convenience.

Specification Summary & Compliance

This thumb screw adheres to UNF (Unified National Fine) thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured to meet common industrial specifications for inch fasteners, ensuring compatibility and performance. The product is compliant with RoHS and REACH environmental directives, making it suitable for use in regulated industries.