S-90079A590 5/16"-18 x 3" 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 and torque application with a 1 1/8" diameter knurled head, reducing slippage during hand-tightening
- Superior corrosion resistance and durability due to the black-oxide steel finish, extending service life in demanding environments
- High tensile strength of 70000 psi ensures reliable fastening under heavy loads and vibration
- Rockwell B84 hardness provides excellent wear resistance and maintains thread integrity over repeated use
- Coarse UNC threading with Class 2A fit allows for quick assembly and disassembly while maintaining secure engagement
- Extended tip design facilitates easier alignment and initial thread engagement in various applications
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and suitability for global industrial markets
Professional Applications & Engineering Value
This black-oxide steel thumb screw is engineered to address common industrial challenges such as frequent adjustments and exposure to harsh conditions. The knurled head offers a non-slip surface, enabling secure manual operation without specialized tools—ideal for machinery access panels, electronic enclosures, and prototyping fixtures. Its partially threaded design with an extended tip simplifies alignment in blind holes, reducing installation time. The UNC coarse thread and Class 2A fit provide robust holding power in materials like metal and plastic, while the 70000 psi tensile strength and corrosion-resistant finish ensure longevity in automotive, aerospace, and manufacturing settings where reliability is critical.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a 5/16"-18 thread size and Class 2A thread fit for precise dimensional accuracy. It meets RoHS 3 (2015/863/EU) compliance under exemption 6(a)-I for lead as an alloying element in steel and is REACH (EC 1907/2006) compliant as of January 17, 2023, ensuring it aligns with international environmental and safety regulations for industrial components.
