S-91830A566 1/4"-20 x 3/8" 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 hand-tightening grip with a 1" diameter knurled round head for secure operation without tools, even in oily or high-vibration environments.
- Excellent corrosion resistance provided by 18-8 Stainless Steel material, ensuring long-term reliability in humid or chemically exposed settings.
- High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for dependable performance under heavy loads.
- Quick and easy installation thanks to the coarse UNC 1/4"-20 thread with Class 2A fit, enabling fast assembly and disassembly.
- Full-threaded design for maximum engagement and holding power along the entire 3/8" length of the screw.
- Raised head profile and integrated collar for enhanced stability and a flush finish when fastened.
- Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global industrial supply chains.
Professional Applications & Engineering Value
This 1/4"-20 knurled thumb screw is engineered to solve common industrial challenges where tool-less, frequent adjustments are required. The 18-8 Stainless Steel construction resists rust and corrosion, making it ideal for machinery panels, electronic enclosures, and outdoor equipment that face moisture or chemical exposure. The coarse UNC thread spacing and Class 2A thread fit ensure rapid, secure fastening with minimal cross-threading risk, reducing assembly time and maintenance costs. The fully threaded design and raised round head with knurling provide a non-slip surface, offering reliable hand-tightening in confined spaces or when gloves are worn. These features make it a go-to thumb screw for OEMs and MRO professionals needing durable, user-friendly fastening solutions.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. Key specifications include a 1/4"-20 thread size, 3/8" length, and a 1" knurled head diameter. It is manufactured from 18-8 Stainless Steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.
