S-91746A832 4-40 x 1/2" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced manual grip with knurled texture for secure, tool-free tightening and loosening in confined spaces.
- Superior corrosion resistance from 18-8 Stainless Steel, ideal for humid or demanding industrial environments.
- High tensile strength of 80,000 psi ensures reliable fastening under mechanical stress without failure.
- Precise Class 2A thread fit with UNC coarse threading for quick assembly and reduced cross-threading risks.
- Durable Rockwell B85 hardness maintains thread integrity and resists wear over repeated use cycles.
- Partial threading design allows for adjustable clamping force and secure positioning in varied applications.
- Compliance with RoHS 3 and REACH standards guarantees safety and environmental responsibility in global supply chains.
Professional Applications & Engineering Value
This 4-40 UNC knurled thumb screw in 18-8 Stainless Steel addresses common industrial challenges like rapid assembly and corrosion-induced failure. The knurled head provides a non-slip surface for manual operation, eliminating the need for tools in maintenance-heavy sectors such as electronics enclosures, machinery panels, and laboratory equipment. Its coarse UNC threads and Class 2A fit ensure consistent engagement, reducing installation time and preventing thread damage. With a 1/2" length and partial threading, it offers versatile clamping for components requiring adjustable tension, while the stainless steel construction withstands exposure to moisture, chemicals, and high-stress environments, extending service life and minimizing downtime.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufacturing follows inch system specifications, including a thread size of 4-40, right-hand direction, and coarse spacing, supporting reliable performance in regulated industrial applications.
