S-99607A211 4-40 x 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 easy manual operation with knurled round head design, eliminating the need for tools in frequent adjustments
- Excellent corrosion resistance and durability thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
- High tensile strength of 80,000 psi ensures reliable holding power and resistance to mechanical stress
- Full threading along the 1/4" length provides maximum engagement and secure fastening in various materials
- Precise Class 2A thread fit with UNC coarse threading guarantees consistent performance and easy installation
- Flared collar design enhances stability and distributes load evenly, reducing surface damage
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and suitability for global markets
Professional Applications & Engineering Value
This 4-40 UNC thumb screw is engineered to address common industrial challenges such as frequent assembly/disassembly and exposure to corrosive conditions. The 18-8 stainless steel material offers inherent corrosion resistance, making it ideal for electronics, machinery panels, and outdoor equipment where durability is critical. The knurled head provides a non-slip grip, enabling quick manual adjustments without tools, which enhances efficiency in maintenance and prototyping. With its fully threaded design and coarse UNC threading, it ensures strong holding power in soft materials or pre-tapped holes, reducing the risk of stripping. This screw is a reliable solution for applications requiring robust, user-friendly fastening with minimal maintenance.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy and easy assembly. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufactured from 18-8 stainless steel with a hardness of Rockwell B85, it delivers consistent performance in industrial settings. The specifications include a right-hand thread direction, fully threaded 1/4" length, and a flared collar for enhanced application reliability.
