S-91185A809 1/4"-20 x 7/8" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with multi-lobe acetal plastic head design for superior grip without tools
• Corrosion-resistant 18-8 stainless steel construction ensures long-term reliability in demanding environments
• Precision Class 3A thread fit provides secure fastening with minimal backlash in assembly applications
• Wide temperature compatibility (32° to 180° F) maintains performance across various operating conditions
• Full threading along 7/8" length allows for adjustable positioning and maximum engagement depth
• Regulatory compliance with RoHS 3 and REACH standards ensures environmental and safety adherence
• Coarse UNC 1/4"-20 threading enables quick installation and removal for frequent adjustments

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw combines the corrosion resistance of marine-grade alloy with the ergonomic advantages of a black acetal plastic multi-lobe head, creating an ideal solution for applications requiring frequent manual adjustments without compromising durability. The UNC coarse threading and Class 3A thread fit ensure precise engagement in machinery, electronic enclosures, and industrial equipment where vibration resistance and repeated access are critical. The fully threaded design provides maximum flexibility in clamping applications, while the temperature-stable acetal head maintains its integrity across typical industrial operating ranges. This combination addresses common pain points of tool-free fastening systems by delivering both superior grip and long-term performance in environments where chemical exposure and frequent handling would degrade lesser components.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with 1/4"-20 UNC coarse threading and Class 3A thread fit for exceptional dimensional accuracy. The screw features a 1 1/2" diameter multi-lobe head with 15/32" height and right-hand thread direction. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international standards for hazardous substance restrictions.