S-91185A821 1/4"-28 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with multi-lobe acetal plastic head design for superior grip without tools
• Exceptional corrosion resistance from 18-8 stainless steel construction in demanding environments
• Precision thread engagement with Class 3A UNF fine threading ensuring secure, vibration-resistant fastening
• Wide temperature compatibility with operational range from 32° to 180° F for diverse industrial settings
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global market access
• Full-threaded design providing maximum engagement depth and adjustment flexibility
• Durable plastic head offering electrical insulation and mar-resistant surface protection

Professional Applications & Engineering Value

Engineered for repeated manual adjustments in industrial equipment, electronic enclosures, and precision instruments, these 1/4"-28 UNF thumb screws solve critical assembly challenges. The 18-8 stainless steel body delivers corrosion resistance in humid or chemical environments, while the black acetal plastic multi-lobe head ensures secure grip even with oily hands. The Class 3A fine threading maintains precise alignment in vibration-prone applications, eliminating the need for tools during frequent maintenance cycles. This combination addresses common pain points of thread stripping, corrosion failure, and inefficient field service across manufacturing, telecommunications, and laboratory equipment sectors.

Specification Summary & Compliance

These thumb screws feature precision Class 3A thread fit with 1/4"-28 UNF fine threading and right-hand thread direction. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency. The fully threaded design maintains consistent engagement, while the inch system measurement provides compatibility with North American equipment standards.