S-99607A235 1/4"-20 x 5/8" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with knurled round head design for secure manual tightening without tools
• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing performance
• Quick installation and removal with coarse UNC threads and Class 2A fit ensuring smooth engagement
• Secure collar design featuring flared collar for improved stability and resistance to loosening under vibration
• Full thread coverage along the 5/8" length for maximum holding power in various material thicknesses
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This 1/4"-20 thumb screw delivers exceptional engineering value in applications requiring frequent adjustments or tool-free access. The 18-8 stainless steel construction provides excellent corrosion resistance for outdoor equipment, marine components, and food processing machinery where moisture exposure is common. The knurled head with flared collar offers superior finger grip even with oily hands or gloves, reducing installation time in assembly lines and maintenance operations. With its coarse UNC thread and Class 2A fit, this fully threaded screw ensures rapid engagement in metal, plastic, and composite materials, making it ideal for electronic enclosures, industrial controls, and machinery guards requiring secure yet accessible fastening solutions.

Specification Summary & Compliance

This thumb screw features precision 1/4"-20 UNC coarse threads with Class 2A tolerance for consistent fit and reliable performance. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. Critical dimensions include 37/64" head diameter, 1/4" head height, 31/64" collar diameter, and 5/8" overall length, providing standardized compatibility across industrial applications.