S-91830A569 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for humid or demanding industrial environments.
- Exceptional grip and torque application from the 1" diameter knurled head, allowing for easy hand-tightening without tools.
- High mechanical strength and durability with 80,000 psi tensile strength and Rockwell B83 hardness to withstand heavy loads.
- Reliable and quick assembly using the UNC coarse thread with Class 2A fit, ensuring consistent engagement and reduced cross-threading risk.
- Full-threaded design for maximum holding power along the entire 1/2" length, providing secure fastening in various material thicknesses.
- Raised round head with collar offers enhanced stability and prevents over-tightening, improving component lifespan.
- Compliance with strict environmental standards including RoHS 3 and REACH, making it safe for regulated industries.
Professional Applications & Engineering Value
This 1/4-20 thumb screw in 18-8 stainless steel is engineered to solve common industrial fastening challenges, such as frequent adjustments or tool-free maintenance. The knurled head and coarse UNC threading enable rapid installation and removal, reducing downtime in assembly lines, machinery panels, and electronic enclosures. Its fully threaded design and Class 2A thread fit ensure precise alignment and vibration resistance, critical for high-stress applications. With excellent corrosion resistance and 80,000 psi tensile strength, it provides long-term reliability in harsh conditions, from outdoor equipment to marine and chemical processing settings, supporting efficient and safe operations.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufacturing specifications include a 1/4"-20 thread size, coarse thread spacing, and right-hand thread direction, providing reliable performance in industrial fastening systems.
