S-99607A237 1/4"-20 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual grip and torque application with a knurled head texture and 37/64" diameter for secure, tool-free tightening and loosening in confined spaces.
• Superior corrosion resistance and durability thanks to 18-8 Stainless Steel construction, ensuring long-term performance in demanding environments.
• High mechanical strength and load-bearing capability with a Rockwell B85 hardness and 80,000 psi tensile strength, reducing the risk of stripping or failure.
• Quick and reliable installation facilitated by a fully threaded UNC coarse spacing design with Class 2A fit, enabling faster assembly and secure fastening.
• Stable seating and alignment provided by the flared collar design, which helps distribute load and prevent loosening under vibration.
• Broad industrial compliance and safety with RoHS 3 and REACH regulations, ensuring environmental and health standards are met for global applications.
• Versatile right-hand threading for standard directional fastening, compatible with common UNC threaded components.

Professional Applications & Engineering Value

This 1/4"-20 knurled thumb screw is engineered to address common challenges in industrial assembly and maintenance, where tool-free access and reliable fastening are critical. The 18-8 Stainless Steel material offers excellent resistance to rust and corrosion, making it ideal for applications in humid or corrosive environments, such as electrical enclosures, machinery panels, and outdoor equipment. The knurled head texture and flared collar design ensure a firm grip and stable seating, reducing the need for additional tools and minimizing installation time. With a UNC coarse thread and Class 2A fit, it provides secure engagement in various materials, preventing cross-threading and enhancing durability in high-vibration settings. This thumb screw is widely used in industries like automotive, aerospace, and electronics, where quick adjustments and robust performance are essential for operational efficiency.

Specification Summary & Compliance

This thumb screw adheres to precise dimensional standards, including a UNC thread with Class 2A fit for consistent threading accuracy and compatibility. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industrial applications. The specifications cover a thread size of 1/4"-20, coarse spacing, right-hand direction, and full threading for uniform fastening strength.