S-91746A420 1/4"-20 x 2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual grip with deep knurling on the round head for secure, tool-free tightening and loosening in industrial environments
• Superior corrosion resistance thanks to 18-8 Stainless Steel construction, ideal for humid or chemically exposed applications
• High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness to withstand repeated use without stripping or deforming
• Reliable thread engagement through UNC coarse threading and Class 2A fit, ensuring consistent fastening and vibration resistance
• Space-saving low-profile design with a head height of just 3/16", perfect for confined assemblies where clearance is limited
• Optimized partial threading over 1 7/8" of the 2" length, providing controlled clamping force and reducing cross-threading risks
• Compliance with environmental standards including RoHS 3 and REACH, meeting strict regulatory requirements for industrial components

Professional Applications & Engineering Value

This 1/4"-20 knurled thumb screw delivers exceptional value in applications requiring frequent adjustments and reliable manual fastening. The 18-8 Stainless Steel material offers excellent resistance to rust and oxidation, making it suitable for outdoor equipment, food processing machinery, and electronic enclosures. The low-profile round head with aggressive knurling ensures a non-slip grip even with oily gloves, reducing installation time and eliminating the need for tools. Combined with UNC coarse threads and a Class 2A thread fit, it provides quick assembly and secure holding power in vibration-prone environments. Engineers specify this partially threaded thumb screw for access panels, jigs, and prototypes where durability and ease of use are critical.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured from 18-8 Stainless Steel with a tensile strength of 80,000 psi and hardness of Rockwell B83. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.