S-98816A223 4-40 x 3/8" 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 grip and easy manual operation with a knurled round head design that prevents slipping during installation and removal
- Excellent corrosion resistance and durability thanks to high-quality brass construction with Rockwell B78 hardness
- Reliable load-bearing capacity supported by a tensile strength of 50,000 psi for demanding applications
- Precise and secure thread engagement ensured by Class 2A thread fit and fully threaded 4-40 UNC coarse thread profile
- Quick assembly and tool-free adjustments with a raised thumb screw head and right-hand thread direction
- Enhanced stability during fastening provided by the integrated collar (1/4" diameter, 1/8" height)
- Environmentally compliant for global markets as it meets RoHS 3 standards with exemption for lead in copper alloy
Professional Applications & Engineering Value
This 4-40 UNC brass thumb screw is engineered to address common industrial challenges such as frequent adjustments, corrosion in harsh environments, and the need for tool-free maintenance. The knurled round head offers exceptional grip, reducing hand fatigue and improving efficiency in assembly lines, electronic enclosures, and machinery panels. Made from brass with Rockwell B78 hardness, it resists wear and oxidation, ensuring longevity in applications like electrical connectors, instrumentation, and HVAC systems. The fully threaded right-hand coarse thread design allows for rapid installation and secure holding power, while the raised profile and collar add stability, preventing over-tightening and misalignment. Ideal for industrial thumb screws requiring reliable, reusable fastening without specialized tools.
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 3/8" length, 4-40 thread size, and coarse thread spacing. It is manufactured in compliance with RoHS 3 (2015/863/EU) regulations, utilizing exemption 6(c) for lead in copper alloy, ensuring suitability for environmentally conscious industrial applications.
