S-91185A483 5/16"-18 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced Grip & Ergonomic Operation: Knurled Acetal plastic head provides superior finger traction for easy hand-tightening without tools, reducing installation time and improving user comfort.
• Excellent Corrosion Resistance: Made from durable 18-8 Stainless Steel, offering reliable performance in various environments and resisting rust and oxidation.
• Precision Thread Fit for Secure Fastening: Class 3A thread fit ensures tighter tolerances and a more secure connection, minimizing the risk of loosening under vibration.
• Space-Saving Low-Profile Design: Round head with a low-profile shape allows installation in tight spaces where clearance is limited, ideal for compact assemblies.
• Wide Thermal Compatibility: Acetal plastic head operates effectively in temperatures from 32° to 180° F, suitable for many indoor and controlled industrial settings.
• Robust UNC Coarse Threading: 5/16"-18 UNC coarse threads enable quick assembly and disassembly, reducing cross-threading risks and enhancing durability.
• Regulatory Compliance for Global Use: Compliant with RoHS 3 and REACH regulations, ensuring safety and environmental standards are met for international supply chains.

Professional Applications & Engineering Value

This low-profile thumb screw is engineered to address common industrial challenges, such as the need for quick, tool-free adjustments in machinery, electronic enclosures, and prototyping setups. The combination of an 18-8 stainless steel body and Acetal plastic head offers a balance of strength and lightweight handling, resisting corrosion in humid or mildly corrosive environments. The fully threaded design with UNC coarse threading ensures consistent engagement and high pull-out strength, while the knurled texture on the head prevents slippage during manual tightening. Ideal for applications requiring frequent access, such as panel fastening or calibration devices, this screw reduces maintenance downtime and supports efficient assembly processes in sectors like electronics, automotive, and industrial equipment.

Specification Summary & Compliance

This thumb screw features a 5/16"-18 UNC thread with a Class 3A fit for precise dimensional accuracy and reliable performance. It is fully threaded and right-hand threaded, adhering to standard inch measurement systems. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industrial and commercial applications.