S-99607A243 1/4"-28 x 7/16" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with knurled head texture for secure manual operation without tools
• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh environments
• Reliable thread engagement with Class 2A fine UNF threads ensuring precise, vibration-resistant connections
• Increased durability and load capacity from 80,000 psi tensile strength and Rockwell B85 hardness
• Quick installation and alignment facilitated by the flared collar design and fully threaded shank
• Compliance with environmental regulations including RoHS 3 and REACH for global industrial use
• Optimized for repeated use with right-hand threading and 37/64" head diameter for comfortable hand adjustment

Professional Applications & Engineering Value

This 1/4"-28 UNF knurled thumb screw delivers exceptional performance in industrial settings where tool-free assembly and disassembly are critical. The 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, making it suitable for machinery, electronic enclosures, and outdoor equipment. Its flared collar design prevents over-insertion and distributes pressure evenly, reducing damage to components. The fine thread spacing and Class 2A thread fit ensure tight, secure fastening that withstands vibrations in dynamic applications. Fully threaded for maximum holding power, this screw is engineered to streamline maintenance and improve operational efficiency in industrial thumb screw applications.

Specification Summary & Compliance

This thumb screw adheres to UNF thread standards with a Class 2A thread fit for precise dimensional accuracy. It is manufactured from 18-8 stainless steel with a tensile strength of 80,000 psi and hardness of Rockwell B85. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial components.