S-91185A495 5/16"-18 x 7/8" Thumb Screws

Key Features & Benefits at a Glance

• Superior Grip & Ergonomic Handling: Knurled acetal plastic head provides excellent non-slip grip even in oily or high-vibration environments, reducing installation time and operator fatigue.
• High Corrosion Resistance: Made from 18-8 Stainless Steel, offering reliable performance and longevity in humid, chemical, or washdown applications without rusting.
• Precise & Secure Fastening: Class 3A thread fit ensures tighter tolerances and superior engagement with mating parts, minimizing the risk of loosening under stress.
• Wide Temperature Suitability: Acetal plastic head operates effectively in temperatures from 32° to 180° F, making it suitable for both indoor and moderate outdoor industrial settings.
• Quick Installation & Adjustment: Low-profile round head and coarse UNC 5/16"-18 threads allow for rapid hand-tightening without tools, ideal for panels, access doors, and frequently adjusted components.
• Full Thread Engagement: Fully threaded 7/8" length provides consistent clamping force along the entire fastener, enhancing joint stability in various material thicknesses.
• Environmental & Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring safety for electronics, medical devices, and other regulated industries.

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw combines the corrosion-resistant properties of 18-8 stainless steel with the durable, lightweight advantages of an acetal plastic knurled head. The design directly addresses common industrial challenges such as frequent tool-less adjustments and exposure to moisture or mild chemicals. The coarse UNC threads and Class 3A fit provide rapid installation with high repeatability, reducing assembly time in production lines. Its low-profile round head is ideal for confined spaces on electronic enclosures, machinery panels, and instrumentation, where both accessibility and a secure, vibration-resistant hold are critical. The fully threaded shank ensures uniform pressure distribution, preventing component misalignment in assemblies subjected to thermal cycling or mechanical stress.

Specification Summary & Compliance

This thumb screw adheres to UNC 5/16"-18 thread standards with a Class 3A thread fit for precision and interchangeability. It is fully threaded with a length of 7/8" and a 1" diameter knurled acetal head. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for use in global markets.