S-91746A119 4-40 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
- Enhanced grip and torque application with a 5/16" knurled head, allowing for easy manual tightening and loosening without tools.
- Superior corrosion resistance and durability thanks to 18-8 Stainless Steel construction, ideal for harsh or washdown environments.
- High tensile strength of 80,000 psi ensures reliable fastening under load, reducing the risk of failure in demanding applications.
- Rockwell B85 hardness provides excellent wear resistance, maintaining thread integrity over repeated use.
- Fully threaded 1/2" length with UNC coarse threads offers maximum engagement and holding power in various materials.
- Class 2A thread fit guarantees consistent, easy assembly while maintaining secure fastening with standard nuts and tapped holes.
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and suitability for global industrial markets.
Professional Applications & Engineering Value
This 4-40 UNC thumb screw is engineered for applications requiring frequent adjustments and reliable performance without specialized tools. The low-profile round head with knurled texture delivers exceptional grip, reducing slippage and operator fatigue in assembly lines, electronic enclosures, and machinery panels. Made from 18-8 Stainless Steel, it resists rust and corrosion in humid or chemical-exposed settings, such as medical devices, marine equipment, and food processing units. The fully threaded design and coarse UNC threads ensure quick installation and robust clamping force, addressing common issues of stripped threads or loose fittings in high-vibration environments. Ideal for industrial thumb screw uses where speed, strength, and compliance are critical.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise, interchangeable assembly. Dimensions include a 1/2" length, 4-40 thread size, and 5/16" head diameter. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industries. Manufactured to deliver consistent performance with a right-hand thread direction and full threading for maximum utility.
