S-90079A255 1/4"-20 x 2 1/2" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior hand-tightening capability with a 1" diameter knurled head for excellent grip without tools
- Enhanced corrosion resistance through black-oxide steel construction for extended service life
- Quick installation and removal with UNC coarse threading (1/4"-20) that resists cross-threading
- Secure fastening in deep applications with extended tip design and 2 1/8" thread length
- Reliable industrial performance with Class 2A thread fit ensuring consistent engagement
- Low-profile round head design that minimizes protrusion in space-constrained applications
- Environmental compliance assurance with RoHS 3 certification for responsible manufacturing
Professional Applications & Engineering Value
This black-oxide steel thumb screw delivers exceptional value in industrial settings where frequent adjustments and tool-free operation are critical. The precision knurled head provides maximum torque application for maintenance panels, access doors, and equipment covers, eliminating the need for specialized tools while preventing slippage. The UNC coarse threading (1/4"-20) ensures rapid installation in steel, aluminum, and composite materials, while the extended tip design guides the screw accurately into pre-tapped holes. The partially threaded construction with 2 1/8" thread length provides optimal clamping force distribution, making it ideal for electronic enclosures, machinery guards, and production jigs where repeated access is required without compromising thread integrity.
Specification Summary & Compliance
This thumb screw features Class 2A thread fit tolerance for reliable engagement, UNC coarse thread standard (1/4"-20) with right-hand direction, and partial threading over 2 1/8" of the 2 1/2" total length. The product maintains RoHS 3 (2015/863/EU) compliance with exemption 6(a)-I for lead as an alloying element in steel, ensuring environmental responsibility while delivering industrial-grade performance in demanding applications.
