S-91882A216 4-40 x 1/4" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced grip and torque application with knurled round head design for secure manual tightening without tools
- Superior corrosion resistance and durability thanks to black-oxide steel construction, extending service life in harsh environments
- High tensile strength of 70,000 psi ensures reliable fastening under heavy loads and vibrations
- Easy installation and precise fit with Class 2A thread fit and coarse UNC threading for quick assembly
- Full threading along the 1/4" length provides consistent engagement and holding power across the entire fastener
- Compliance with RoHS 3 and REACH standards guarantees safe, environmentally responsible use in regulated industries
- Rockwell B84 hardness offers excellent wear resistance, reducing deformation during repeated use
Professional Applications & Engineering Value
This 4-40 UNC thumb screw is engineered to address common industrial challenges such as frequent adjustments and tool-free access needs. The black-oxide steel material provides a protective layer against oxidation and wear, making it ideal for electronics, machinery, and assembly lines where moisture or chemicals are present. Its knurled head ensures a firm grip, allowing operators to tighten or loosen quickly without slippage, enhancing productivity in maintenance and prototyping. The coarse thread spacing and right-hand thread direction facilitate fast engagement, reducing installation time while the fully threaded design ensures uniform stress distribution, preventing loosening under dynamic loads. Suitable for enclosures, panels, and fixtures, this screw delivers reliable performance in industrial applications requiring robust, user-friendly fastening.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy and interchangeability. Key specifications include a thread size of 4-40, length of 1/4", and coarse spacing for efficient assembly. It is manufactured in compliance with RoHS 3 (2015/863/EU) with exemption 6(a)-I and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence for global supply chains.
