S-91746A448 5/16"-18 x 3" Thumb Screws

Key Features & Benefits at a Glance

• Superior manual grip with 3/4" diameter knurled head for secure, tool-free tightening in industrial applications
• Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for demanding environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for reliable performance
• Precise thread engagement with Class 2A UNC coarse threads ensuring consistent fastening and vibration resistance
• Optimized thread design with partial threading and 2 15/16" thread length for balanced strength and installation flexibility
• Low-profile round head design with 1/4" height for space-constrained applications without compromising grip
• Full regulatory compliance with RoHS 3 and REACH standards for safe use across industrial sectors

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw delivers exceptional engineering value through its 18-8 stainless steel composition and knurled head design, specifically engineered to solve critical industrial fastening challenges. The material's inherent corrosion resistance makes it ideal for machinery, electronic enclosures, and outdoor equipment where environmental exposure is a concern. The coarse UNC thread configuration provides rapid installation and superior holding power in softer materials, while the low-profile round head with aggressive knurling ensures maximum manual torque application without specialized tools. This combination addresses common pain points in maintenance access panels, adjustable components, and frequently disassembled equipment by providing reliable, repeatable fastening performance that withstands industrial cycling demands.

Specification Summary & Compliance

This thumb screw features Class 2A thread fit tolerance for consistent engagement, UNC coarse thread specification (5/16"-18), and partial threading extending 2 15/16" along the 3" length. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and chemical substance restrictions are fully met for industrial applications.