S-91882A434 5/16"-18 x 5/8" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual grip and torque application with a knurled, round head design for secure handling in high-vibration or gloved environments.
• Superior corrosion resistance and durability provided by the black-oxide steel finish, extending service life in demanding industrial conditions.
• High-strength performance under load with a tensile strength of 70,000 psi and Rockwell B84 hardness for reliable fastening in heavy-duty applications.
• Quick and easy installation thanks to the coarse UNC thread and Class 2A fit, ensuring smooth engagement and reduced assembly time.
• Full-threaded design for maximum holding power along the entire 5/8" length, providing consistent clamping force and stability.
• Compliance with international environmental and safety standards including RoHS 3 and REACH, ensuring safe and sustainable use in global supply chains.
• Right-hand thread direction for standard operation, facilitating intuitive use and compatibility with common industrial equipment.

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw is engineered to address common challenges in industrial assembly, such as the need for tool-free adjustments and resistance to wear. The black-oxide steel construction offers enhanced protection against rust and abrasion, making it ideal for machinery, electronic enclosures, and automotive components where frequent access is required. The knurled round head ensures a firm grip, reducing slippage and improving operator efficiency in high-stress environments. With its coarse thread spacing and fully threaded design, it provides rapid fastening and reliable retention, minimizing downtime in production lines. This screw is a practical solution for applications demanding heavy-duty performance and compliance with rigorous industry standards.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy and interchangeability. Key specifications include a thread size of 5/16"-18, a length of 5/8", and coarse thread spacing. It is manufactured in compliance with RoHS 3 (2015/863/EU) with exemption 6(a)-I and REACH (EC 1907/2006), ensuring environmental safety and regulatory alignment for industrial use.