S-91746A445 5/16"-18 x 2 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Superior manual grip and torque application with a 3/4" diameter knurled head for slip-resistant operation without tools
• Exceptional corrosion resistance and durability thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• High mechanical strength and load-bearing capacity with 80,000 psi tensile strength and Rockwell B83 hardness
• Quick and secure coarse thread engagement via 5/16"-18 UNC threads for rapid assembly and disassembly
• Optimized low-profile design with 1/4" head height for applications with limited clearance
• Precise thread fit and reliable performance ensured by Class 2A thread tolerance for consistent fastening
• Safe for regulated industries with full compliance to RoHS 3 and REACH environmental standards

Professional Applications & Engineering Value

This low-profile knurled thumb screw addresses critical assembly challenges in industrial settings where tool-free, frequent adjustments are required. The 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, making it suitable for outdoor equipment, electrical enclosures, and machinery panels. Its coarse UNC threading ensures quick installation even in blind holes, while the partially threaded design offers controlled clamping force. The knurled head texture delivers a firm grip with gloves or oily hands, reducing installation time and improving operator safety in maintenance-heavy environments such as manufacturing, automotive, and packaging systems.

Specification Summary & Compliance

This thumb screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for precise dimensional accuracy. It is manufactured from 18-8 stainless steel, delivering 80,000 psi tensile strength and Rockwell B83 hardness. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial fastener applications.