S-91830A642 5/16"-18 x 1 1/4" 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
- Superior grip and torque application with a 1 1/4" diameter knurled head for easy hand-tightening and loosening without tools.
- Excellent corrosion resistance provided by 18-8 Stainless Steel, ideal for harsh or wash-down environments.
- High mechanical strength and durability with a Rockwell B83 hardness and 80,000 psi tensile strength for reliable performance under load.
- Wide compatibility and secure fastening due to the 5/16"-18 UNC coarse thread with Class 2A fit, ensuring easy engagement and vibration resistance.
- Full thread engagement along the 1 1/4" length for maximum holding power and stability in various material thicknesses.
- Ergonomic raised round head design with a 5/8" collar diameter for comfortable use and enhanced control during adjustment.
- Compliance with environmental and safety standards, being RoHS 3 and REACH compliant for use in regulated industries.
Professional Applications & Engineering Value
This 5/16"-18 UNC knurled thumb screw is engineered to solve common industrial challenges where frequent adjustments or tool-less access is required. The 18-8 Stainless Steel construction ensures long-term reliability in corrosive or high-moisture settings, such as in industrial machinery, electronic enclosures, and medical devices. The coarse UNC thread and Class 2A fit provide quick installation and robust holding, reducing assembly time and minimizing the risk of cross-threading. The fully threaded design and raised round head with knurling offer superior grip, making it ideal for applications requiring repeated manual tightening, such as panel fastening, jigs, and fixtures, while maintaining high tensile strength for demanding environments.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and ease of assembly. Key specifications include a 5/16"-18 thread size, 1 1/4" length, and fully threaded design. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial and commercial use.
