S-91746A414 1/4"-20 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and extended service life.
• Excellent hand-tightening grip provided by the knurled, 3/4" diameter round head, ensuring secure and tool-free installation.
• High mechanical strength and durability from 80,000 psi tensile strength and Rockwell B83 hardness, preventing stripping and deformation under load.
• Precise and reliable threading with a 1/4"-20 UNC coarse thread and Class 2A fit, offering consistent engagement and vibration resistance.
• Optimized for space-constrained applications due to its low-profile head design and partially threaded shank.
• Simplified assembly and adjustment with right-hand thread direction, conforming to standard industry practices.
• Safe for regulated industries with full compliance to RoHS 3 and REACH environmental regulations.

Professional Applications & Engineering Value

This 1/4-20 UNC Thumb Screw is engineered to solve critical challenges in industrial and electronic assembly. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions. The knurled head texture ensures a non-slip grip, allowing for quick manual adjustments without specialized tools, which is vital in maintenance panels, access doors, and frequently adjusted fixtures. The coarse UNC thread and Class 2A fit deliver reliable fastening in materials where precise thread engagement is necessary to resist loosening from vibrations. Its partially threaded design concentrates the clamping force effectively, preventing damage to sensitive components in electronics, machinery, and instrumentation. This combination of features offers a durable, user-friendly fastening solution that reduces installation time and enhances operational reliability.

Specification Summary & Compliance

This thumb screw adheres to Unified Coarse (UNC) thread standards with a Class 2A tolerance for consistent fit and interchangeability. Key dimensional specifications include a 1/4"-20 thread size, 1" overall length, and a 15/16" thread length. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in various global markets.