S-91746A417 1/4"-20 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for demanding industrial environments
• Exceptional grip and torque application thanks to the knurled round head design, enabling tool-free hand tightening
• High mechanical strength and durability with a Rockwell B83 hardness and 80,000 psi tensile strength for reliable performance
• Fast and easy installation with coarse UNC threading and a Class 2A thread fit, ensuring smooth engagement
• Versatile full-threaded length of 1 1/4" provides consistent holding power along the entire fastener
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe and responsible sourcing
• Right-hand thread direction for standard, intuitive installation in common applications

Professional Applications & Engineering Value

This 1/4"-20 knurled thumb screw is engineered to solve critical challenges in assembly, maintenance, and access panel applications where tools are impractical or speed is essential. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for use in humid, chemical, or outdoor industrial environments. The fully threaded design and coarse UNC thread ensure rapid installation and a secure hold, reducing assembly time. The knurled head texture offers a non-slip surface, allowing operators to apply sufficient torque by hand even with gloves on. This combination of a durable material, user-friendly design, and reliable thread fit makes it an indispensable fastening solution for machinery, electronic enclosures, and frequently adjusted components.

Specification Summary & Compliance

This thumb screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and interchangeability. The fastener is fully threaded and measures 1 1/4" in length with a 5/16" head diameter. It is manufactured from 18-8 Stainless Steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for hazardous substances.