S-91746A018 4-40 x 5/8" 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 corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and extending service life.
- Enhanced manual grip and torque application thanks to the knurled round head design, reducing slippage and improving tightening efficiency.
- High tensile strength of 80,000 psi ensures reliable fastening under load, minimizing the risk of failure in demanding applications.
- Precise Class 2A thread fit with coarse UNC threading for easy installation and secure engagement in various materials.
- Full threading along the 5/8" length provides consistent holding power and flexibility in adjustment depths.
- Durable Rockwell B83 hardness maintains thread integrity and resists wear over repeated use cycles.
- Compliance with RoHS 3 and REACH standards guarantees environmental safety and regulatory acceptance in global markets.
Professional Applications & Engineering Value
This 4-40 UNC thumb screw in 18-8 Stainless Steel addresses common industrial challenges by combining corrosion resistance with robust mechanical properties. The knurled head offers exceptional manual control, eliminating the need for tools in tight spaces and reducing assembly time. Its coarse UNC thread and Class 2A fit ensure quick, secure fastening in equipment panels, electronic enclosures, and machinery components, where vibration resistance and easy maintenance are critical. Fully threaded for uniform stress distribution, it provides reliable performance in industrial applications requiring frequent adjustments, enhancing operational efficiency and reducing downtime.
Specification Summary & Compliance
This thumb screw features a 4-40 UNC thread with Class 2A fit for precise dimensional accuracy, ensuring compatibility with standard components. It is manufactured from 18-8 Stainless Steel with a hardness of Rockwell B83 and tensile strength of 80,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use.
