S-91404A537 1/4"-20 x 1/2" 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
- Tool-free installation and removal with a large 1 3/8" wing head for quick manual adjustments in tight spaces.
- Enhanced corrosion resistance from the zinc-plated iron construction, extending service life in various industrial environments.
- Reliable and secure fastening due to the fully threaded UNC coarse spacing and Class 2A thread fit, ensuring maximum grip and vibration resistance.
- Broad compatibility with standard 1/4"-20 UNC nuts and threaded holes, simplifying sourcing and assembly processes.
- Precise dimensional control with a head diameter tolerance of -0.0156" to 0.0156" for consistent performance and fit.
- Right-hand thread design for intuitive, standard directional tightening in common applications.
- Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe and sustainable use in global markets.
Professional Applications & Engineering Value
This zinc-plated iron thumb screw is engineered to address common challenges in industrial maintenance, electronics, and machinery assembly where frequent adjustments are necessary. The fully threaded 1/4"-20 UNC coarse thread provides superior holding power and reduces cross-threading risks, while the large wing head enables rapid, tool-free operation—ideal for reducing downtime on production lines or in field service. The zinc plating offers a protective barrier against moisture and corrosion, making it suitable for use in environments prone to wear. By combining ease of use with robust Class 2A thread fit accuracy, this screw delivers reliable performance in applications requiring repeated access without compromising fastener integrity.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional tolerance and easy assembly. Key specifications include a 1/4"-20 thread size, fully threaded coarse spacing, and a right-hand thread direction. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.
