S-91746A410 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Excellent hand-tightening capability thanks to the knurled round head design providing maximum grip without tools
• High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable performance
• Quick installation with UNC coarse thread spacing and Class 2A fit ensuring smooth engagement
• Full thread coverage along the 1/2" length for maximum holding power in various material thicknesses
• Regulatory compliance meeting RoHS 3 and REACH standards for safe use across industries
• Right-hand threading following standard industrial conventions for intuitive operation

Professional Applications & Engineering Value

These 1/4-20 thumb screws deliver exceptional value in applications requiring frequent adjustments or tool-free assembly. The 18-8 stainless steel construction provides reliable corrosion resistance in manufacturing, electronics, and outdoor equipment. The knurled round head with narrow profile ensures secure grip even with gloved hands, while the fully threaded UNC coarse spacing enables rapid installation in panels, access covers, and machinery guards. With Class 2A thread fit, these screws maintain consistent engagement across multiple cycles, reducing maintenance downtime in industrial settings where quick access is critical for operational efficiency.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC 1/4"-20 coarse thread specification. The 5/16" head diameter and 1/2" length provide optimal proportions for hand-tightening applications. These thumb screws comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and chemical substance restrictions are met for global industrial use.