S-91830A634 5/16"-18 x 5/8" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual installation and removal with a generously sized 1 1/4" knurled head for superior grip, even with gloves on.
• Exceptional corrosion resistance provided by 18-8 Stainless Steel, ensuring long-term reliability in demanding environments.
• High mechanical strength with an 80,000 psi tensile strength and Rockwell B83 hardness to withstand significant loads and prevent stripping.
• Quick and secure coarse threading with 5/16"-18 UNC threads and a Class 2A fit for faster assembly and reliable engagement in a wide range of materials.
• Durable, fully-threaded design offers consistent holding power along the entire 5/8" length for versatile and secure fastening applications.
• Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications.
• Ergonomic raised round head profile combines comfortable use with a low-profile design that minimizes snagging.

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw is engineered to solve critical challenges in industrial maintenance, machinery, and electronic enclosures. The knurled head and coarse UNC thread allow for rapid tool-free adjustments and secure fastening in applications where frequent access is required. The high tensile strength and corrosion-resistant properties of the material ensure that the screw maintains its integrity under vibration and in harsh conditions, reducing maintenance downtime and replacement costs. Its fully threaded design and Class 2A thread fit provide versatile and reliable performance in metal, plastic, and wood, making it an indispensable component for engineers seeking a durable, user-friendly thumb screw solution.

Specification Summary & Compliance

This thumb screw adheres to the UNC coarse thread standard with a size of 5/16"-18 and a precision Class 2A thread fit for consistent performance. The dimensional specifications include a length of 5/8", a head diameter of 1 1/4", and a collar diameter of 5/8". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.