S-91830A104 4-40 x 7/16" 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Excellent hand-tightening capability thanks to the knurled round head design for secure grip without tools
- High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for reliable performance
- Precise thread engagement with Class 2A UNC coarse threads ensuring consistent fit and vibration resistance
- Full-length threading provides maximum holding power across the entire 7/16" length
- Environmental compliance with RoHS 3 and REACH standards for safe use in regulated industries
- Right-hand thread direction for intuitive installation and standard operation
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers exceptional engineering value in applications requiring frequent adjustments or tool-free operation. The 18-8 stainless steel construction provides excellent corrosion resistance, making it suitable for electronics enclosures, machinery guards, and laboratory equipment where exposure to moisture or chemicals is common. The knurled round head with raised profile offers superior tactile grip even with gloved hands, while the coarse UNC threads ensure quick installation and removal. The fully threaded design maintains consistent clamping force across the entire length, preventing loosening under vibration. These features make it an ideal industrial thumb screw for maintenance panels, access doors, and adjustable components in manufacturing, aerospace, and telecommunications sectors.
Specification Summary & Compliance
This thumb screw features 4-40 UNC coarse threads with Class 2A thread fit for standard industrial applications. The product maintains dimensional accuracy with a 7/16" length, 3/8" head diameter, and 1/4" collar diameter. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. The right-hand thread direction and fully threaded configuration provide reliable performance in demanding fastening applications.
