S-90017A547 1/4"-20 x 1 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 manual grip and torque application with a substantial 3/4" wide rectangular head design
- Superior corrosion resistance and a non-reflective finish provided by the durable black-oxide steel coating
- Quick and easy engagement in a wide range of materials thanks to the coarse UNC 1/4"-20 thread profile
- Secure and reliable fastening with precise thread fit ensured by the Class 2A thread tolerance standard
- Versatile positioning and clamping control enabled by the partially threaded shank design
- Simplified installation and removal without tools facilitated by the 5/8" tall thumb head
- Safe for use in regulated environments as it is fully compliant with RoHS 3 (2015/863/EU) standards
Professional Applications & Engineering Value
This black-oxide steel thumb screw is engineered to solve critical challenges in industrial assembly and maintenance. The rectangular head and generous height provide exceptional leverage for hand-tightening, eliminating the need for tools in applications requiring frequent adjustments, such as access panels, machine guards, and jig fixtures. The coarse UNC thread (1/4"-20) with a Class 2A fit ensures rapid installation and high resistance to stripping in softer materials or pre-tapped holes. The partial threading offers a precise unthreaded shoulder for accurate component positioning and alignment. The black-oxide finish not only adds a layer of corrosion protection for demanding environments but also reduces light glare, making it ideal for optical equipment and electronic enclosures.
Specification Summary & Compliance
This thumb screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for consistent, reliable engagement. The screw is partially threaded with a 1" thread length on a total shank length of 1 1/4". It is manufactured from steel with a black-oxide surface treatment and conforms to RoHS 3 (2015/863/EU) compliance, ensuring it is free of hazardous substances for global industrial use.
