S-90079A633 3/8"-16 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Tool-free installation and adjustment with a generously sized 1 1/4" knurled head for superior hand grip and torque application.
• Enhanced corrosion resistance from the black-oxide steel finish, providing durability in various industrial environments.
• Quick and reliable assembly thanks to the 3/8"-16 UNC coarse thread, designed for faster engagement and reduced cross-threading risk.
• Secure and precise fastening in pre-tapped holes or with nuts, facilitated by the extended 3/16" tip for easier alignment.
• Versatile partial threading along the 2 1/2" length allows for both clamping and spacing functions in a single component.
• Consistent and reliable thread fit ensured by the Class 2A thread standard, promoting interchangeability and predictable performance.
• Compliance with environmental regulations as it is RoHS 3 compliant, making it suitable for regulated markets and sustainable procurement.

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to solve common industrial challenges where frequent adjustments or tool-less access is critical. The knurled head provides an exceptional non-slip surface, allowing operators to apply sufficient torque by hand, even in oily or high-vibration environments—eliminating the need for wrenches and speeding up maintenance cycles. The 3/8"-16 UNC coarse thread ensures rapid installation and robust holding power in machinery, electronic enclosures, and fixture jigs. Its extended tip aids in aligning and starting threads in hard-to-reach areas, reducing assembly time and preventing damage to threaded components. Made from RoHS compliant steel, it meets stringent environmental standards without compromising mechanical strength, making it an ideal choice for OEMs and MRO applications requiring dependable, reusable fasteners.

Specification Summary & Compliance

This thumb screw features a Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It is manufactured from black-oxide coated steel with a right-hand thread direction and is RoHS 3 (2015/863/EU) compliant under exemption 6(a)-I for lead as an alloying element in steel. The product adheres to inch system measurements with a coarse thread spacing, partially threaded design, and an overall length of 2 1/2".