S-91746A418 1/4"-20 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior grip and torque application with 3/4" knurled head for slip-resistant hand tightening without tools
• Exceptional corrosion resistance through 18-8 stainless steel construction for long-term reliability in harsh environments
• Optimized low-profile design (3/16" head height) for applications with limited clearance while maintaining easy manual operation
• High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness to withstand heavy operational loads
• Precision thread engagement with Class 2A UNC coarse threads ensuring reliable fastening and easy alignment
• Versatile partial threading (1 7/16" thread length) allowing for adjustable clamping pressure and secure positioning
• Full regulatory compliance meeting RoHS 3 and REACH standards for safe use across regulated industries

Professional Applications & Engineering Value

This 1/4"-20 thumb screw delivers critical engineering advantages in industrial settings where frequent adjustments and tool-free operation are essential. The 18-8 stainless steel construction provides inherent corrosion resistance, making it ideal for manufacturing equipment, electronic enclosures, and outdoor applications where moisture or chemicals are present. The knurled low-profile head offers exceptional ergonomic benefits, enabling operators to apply sufficient torque even in confined spaces. With its UNC coarse threading and Class 2A thread fit, this fastener ensures quick installation and reliable performance in vibration-prone environments. The partially threaded design allows for precise clamping control in jigs, fixtures, and access panels, reducing assembly time while maintaining secure fastening integrity.

Specification Summary & Compliance

This thumb screw features precision 1/4"-20 UNC coarse threads with Class 2A thread fit for consistent engagement and reliable performance. Manufacturing specifications include a 3/4" diameter knurled head with 3/16" low-profile height and 1 1/2" overall length with 1 7/16" threaded portion. The fastener is manufactured from 18-8 stainless steel with mechanical properties including 80,000 psi tensile strength and Rockwell B83 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial applications worldwide.