S-99607A189 1/4"-20 x 3/4" 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 adjustment with knurled head texture for superior hand-tightening grip in tight spaces
- Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for humid or chemical environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for demanding applications
- Secure threaded engagement through Class 2A thread fit and fully threaded design preventing loosening under vibration
- Enhanced load distribution via flared collar design that reduces surface pressure and material deformation
- Wide compatibility with UNC coarse threading (1/4"-20) matching standard industrial components
- Regulatory compliance meeting RoHS 3 and REACH standards for global manufacturing and electronics applications
Professional Applications & Engineering Value
Engineered for tool-free fastening in industrial maintenance, electronic enclosures, and machinery access panels, this 18-8 stainless steel thumb screw solves critical assembly challenges. The knurled head texture provides reliable grip even with oily hands or gloves, while the flared collar design prevents over-tightening and distributes clamping force evenly. With UNC coarse threading and Class 2A thread fit, installation is quick and secure without specialized tools. The fully threaded 3/4" length ensures consistent engagement depth, making these thumb screws ideal for applications requiring frequent adjustments or where tool access is limited.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with 1/4"-20 UNC coarse threads maintaining Class 2A thread fit tolerances for consistent performance. The 18-8 stainless steel construction provides Rockwell B85 hardness and 80,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmentally responsible manufacturing. Features include 37/64" knurled head diameter, 1/4" head height, and flared collar design with 31/64" collar diameter.
