S-91746A472 1/4"-28 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior manual grip with a fully knurled head texture for secure, tool-free tightening and loosening in tight spaces.
• Excellent corrosion resistance provided by 18-8 Stainless Steel, ensuring long-term reliability in various environments.
• High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for demanding applications.
• Precise and secure fastening with a 1/4"-28 UNF fine thread and Class 2A fit, minimizing the risk of cross-threading.
• Full-length threading for consistent engagement and holding power along the entire 1/2" length.
• Compliance with strict environmental standards, including RoHS 3 and REACH, for safe and sustainable use.
• Right-hand thread direction for standard, intuitive manual operation.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Thumb Screw is engineered to solve common industrial challenges where quick, tool-free adjustments are essential. The fully knurled head provides exceptional grip, reducing slippage and operator fatigue during repeated manual fastening in applications like access panels, machinery guards, and electronic enclosures. Its fine UNF thread (1/4"-28) and Class 2A fit ensure precise alignment and vibration resistance, critical in maintaining integrity in assemblies subject to movement or thermal cycling. Made from corrosion-resistant stainless steel, it withstands harsh conditions without degrading, making it ideal for use in manufacturing, aerospace, and outdoor equipment where durability and reliability are paramount.

Specification Summary & Compliance

This thumb screw adheres to UNF thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured from 18-8 Stainless Steel and is fully threaded over a 1/2" length. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety standards for industrial use.