S-98704A800 5/16"-18 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening and removal with a knurled Acetal Plastic head, providing superior grip without tools in frequent-access applications.
• Enhanced corrosion resistance in various environments due to the 18-8 Stainless Steel construction, ensuring long-term reliability.
• Secure and precise thread engagement with a Class 3A thread fit and UNC coarse threading, reducing the risk of cross-threading and ensuring a tight, reliable fastening.
• Dual fastening capability featuring both a thumb head for manual use and a 1/4" hex drive for high-torque applications with a wrench.
• Durable, low-profile round head design that minimizes snagging and provides a clean, finished appearance in assembled products.
• Stable performance across a wide temperature range (32° to 180° F), making it suitable for both indoor and many industrial settings.
• Safe for regulated industries with full compliance to RoHS 3 and REACH environmental standards.

Professional Applications & Engineering Value

This 5/16"-18 Black 18-8 Stainless Steel Thumb Screw is engineered to solve common industrial challenges where tool-less access and corrosion resistance are paramount. The combination of a knurled Acetal Plastic head and a 1/4" hex drive offers unparalleled versatility, allowing for quick manual adjustments in field service or maintenance panels, while still permitting a wrench for final torque in high-vibration environments. The fully threaded 1/2" length and UNC coarse thread provide rapid installation and high pull-out strength in softer materials or pre-tapped holes, commonly found in electronics enclosures, machinery guards, and automotive components. Its black finish and low-profile round head contribute to a professional aesthetic and reduced risk of accidental snagging, making it an ideal choice for OEMs and MRO suppliers who value both function and form.

Specification Summary & Compliance

This thumb screw adheres to precise dimensional standards, including a Class 3A thread fit for superior tolerance and a 5/16"-18 UNC coarse thread. The product is manufactured to be fully threaded with a right-hand thread direction and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for global industrial use.