S-99607A186 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior grip and torque application with knurled head texture for easy hand-tightening without tools
• Excellent corrosion resistance from 18-8 stainless steel construction for long-term reliability in harsh environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for demanding applications
• Precise thread engagement with Class 2A UNC coarse threads ensuring reliable fastening performance
• Quick installation and removal through flared collar design providing enhanced thumb grip surface
• Full thread coverage along 1/2" length for maximum holding power and alignment stability
• Environmental compliance meeting RoHS 3 and REACH regulations for safe industrial use

Professional Applications & Engineering Value

This 1/4"-20 UNC thumb screw delivers exceptional performance where frequent access and corrosion resistance are critical. The 18-8 stainless steel construction provides reliable operation in manufacturing equipment, electronic enclosures, and outdoor applications where moisture and chemicals are present. The knurled head with flared collar design enables secure grip even with gloved hands, reducing installation time while preventing slippage. The coarse UNC threading and Class 2A fit ensure quick engagement and consistent clamping force, making these thumb screws ideal for maintenance panels, access doors, and adjustable components across industrial machinery, telecommunications, and transportation equipment.

Specification Summary & Compliance

This thumb screw features 1/4"-20 UNC threading with Class 2A tolerance for precise fit, fully threaded 1/2" length, and 37/64" head diameter with knurled texture. Manufactured from 18-8 stainless steel with Rockwell B85 hardness and 80,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications.