S-90200A548 1/4"-20 x 1" 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 hand-tightening efficiency with a 5/8" diameter knurled head for superior grip without tools
- High durability and corrosion resistance from black-oxide steel, extending service life in demanding environments
- Reliable thread engagement with Class 2A fit UNC coarse threads, ensuring secure fastening and vibration resistance
- Robust mechanical strength backed by 70,000 psi tensile strength and Rockwell B84 hardness for heavy-duty applications
- Full 1" threading provides consistent holding power along the entire length for versatile mounting
- Compliance with environmental standards including RoHS 3 and REACH, making it safe for regulated industries
- Right-hand thread design facilitates standard installation and removal for operator convenience
Professional Applications & Engineering Value
This black-oxide steel thumb screw is engineered to address common industrial challenges such as frequent adjustments and tool-free access in confined spaces. The high-profile round head with knurled texture ensures a firm grip, reducing slippage and hand fatigue during manual tightening. Its 1/4"-20 UNC coarse threads with Class 2A fit offer quick assembly and disassembly, ideal for applications in machinery, electronics enclosures, and prototyping where precision and speed are critical. The fully threaded 1" length and robust material properties provide consistent clamping force, preventing loosening under vibration and enhancing the reliability of assemblies in manufacturing, maintenance, and testing environments.
Specification Summary & Compliance
This thumb screw adheres to Class 2A thread fit and UNC coarse thread standards for precise dimensional accuracy. It is manufactured from black-oxide steel with a tensile strength of 70,000 psi and Rockwell B84 hardness. The product is RoHS 3 (2015/863/EU) compliant with exemption 6(a)-I and REACH (EC 1907/2006) compliant, ensuring it meets stringent environmental and safety regulations for industrial use.
