S-97424A620 1/4"-80 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced Grip and Comfort: Knurled black acetal plastic head provides superior finger traction for easy hand-tightening without tools, reducing installation time and fatigue.
• High Tensile Strength for Demanding Applications: 18-8 stainless steel construction offers excellent corrosion resistance and a robust 60,000 psi tensile strength, ensuring reliable performance under stress.
• Precision Fine Threading for Secure Fastening: Ultra fine 1/4"-80 UNS thread with Class 3A fit delivers tight, vibration-resistant connections ideal for fine adjustments in sensitive assemblies.
• Versatile Ball Tip Design: Rounded ball end helps prevent damage to contact surfaces and facilitates easier insertion in misaligned or hard-to-reach holes.
• Durable and Lightweight Head Material: Acetal plastic head is resistant to wear and maintains integrity up to 180°F, offering a perfect balance of durability and weight savings.
• Full Thread Engagement for Maximum Hold: Fully threaded 1 1/4" length ensures consistent clamping force along the entire fastener, enhancing joint stability.
• Compliant with International Standards: Meets RoHS 3 and REACH environmental regulations, ensuring safe use in global markets and electronics applications.

Professional Applications & Engineering Value

This 1/4"-80 ultra fine thread thumb screw is engineered to address common challenges in precision industries like electronics, medical devices, and optical equipment, where fine adjustments and reliable, tool-free fastening are critical. The 18-8 stainless steel body provides excellent corrosion resistance, essential for environments exposed to moisture or chemicals, while the Class 3A thread fit with UNS right-hand threading ensures minimal backlash and secure, repeatable positioning. The knurled black acetal plastic head offers a non-slip grip that withstands frequent adjustments without marring, and the ball tip reduces the risk of cross-threading or surface damage during installation. Ideal for applications requiring meticulous torque control and easy access, this thumb screw enhances assembly efficiency and reduces maintenance needs in compact or delicate mechanisms.

Specification Summary & Compliance

This thumb screw features precise Class 3A thread fit with UNS ultra fine threading (1/4"-80) and a right-hand thread direction, ensuring high dimensional accuracy and compatibility with standard nuts. The 18-8 stainless steel construction meets general-purpose fastening requirements, with a tensile strength of 60,000 psi. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing adherence to environmental and safety standards for hazardous substances. The product is designed for reliable performance in applications demanding fine thread engagement and hand-operated convenience.