S-91882A429 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 manual grip with knurled texture on the round head for secure, tool-free installation and removal
- Superior corrosion resistance due to the black-oxide steel finish, extending service life in various environments
- High mechanical strength with 70,000 psi tensile strength and Rockwell B84 hardness for reliable, durable fastening
- Quick and easy assembly thanks to the coarse UNC thread and fully threaded design for rapid engagement
- Precise thread fit with Class 2A tolerance ensuring consistent performance and compatibility with standard nuts
- Versatile raised head profile with integrated collar providing stable seating and improved load distribution
- Compliant with environmental regulations including RoHS 3 and REACH, making it suitable for global industrial supply chains
Professional Applications & Engineering Value
This 1/4"-20 knurled round head thumb screw is engineered to address common challenges in tool-free fastening applications. The black-oxide steel construction offers excellent durability and resistance to rust, making it ideal for equipment panels, access covers, and adjustable components in industrial settings. The coarse UNC thread with Class 2A fit ensures quick installation and reliable holding power, reducing assembly time and minimizing the risk of cross-threading. Its fully threaded design and raised head with collar provide uniform clamping force and stability, essential for vibration-prone environments. These features make it a top choice for maintenance, prototyping, and machinery where frequent adjustments are needed without specialized tools.
Specification Summary & Compliance
This thumb screw features a 1/4"-20 UNC thread with coarse spacing and Class 2A thread fit 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 complies with RoHS 3 (2015/863/EU) under exemption 6(a)-I and REACH (EC 1907/2006) regulations, ensuring it meets international environmental and safety standards for industrial use.
