S-98704A610 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and comfort with a knurled acetal plastic head for easy hand-tightening without tools
• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh environments
• Precise thread engagement with Class 3A UNC coarse threading ensuring reliable, vibration-resistant fastening
• Low-profile design allows use in tight spaces while maintaining easy manual operation
• Wide temperature tolerance (32° to 180° F) for stable performance across various industrial conditions
• Full threading provides consistent clamping force along the entire screw length
• Environmental compliance with RoHS 3 and REACH standards for safe, sustainable manufacturing

Professional Applications & Engineering Value

This low-profile thumb screw combines the strength of 18-8 stainless steel with the ergonomic advantages of a knurled acetal plastic head, addressing common assembly challenges in electronics, machinery, and instrumentation. The Class 3A UNC coarse thread ensures quick installation and high resistance to loosening under vibration, critical for maintenance panels, access doors, and adjustable components. Its black finish offers a professional appearance while the fully threaded design distributes load evenly, preventing stress concentration. Ideal for applications requiring frequent adjustments, this screw eliminates the need for tools in confined spaces, reducing assembly time and improving operator efficiency in industrial settings.

Specification Summary & Compliance

This thumb screw meets UNC thread standards with 1/4"-20 coarse threading and Class 3A fit for precise tolerance. Manufacturing adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety. The screw is fully threaded with a right-hand thread direction and features a 3/16" hex drive for optional tool use.