S-91773A584 5/16"-18 x 1 1/4" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Exceptional mechanical strength with a 100,000 psi tensile strength and Rockwell B100 hardness for secure, high-load fastening applications.
• Optimized for quick assembly featuring UNC coarse threading and Class 2A thread fit, which reduces cross-threading and speeds up installation.
• Secure and stable drive engagement with a Phillips No. 3 drive and rounded head design, minimizing cam-out and providing a flush, professional finish.
• Full-threaded design ensures maximum grip and holding power along the entire 1-1/4" length for consistent performance.
• Broad industrial compatibility as it meets ASME B18.6.3 specifications, ensuring precise dimensions and reliable performance in standardized assemblies.
• Environmentally responsible manufacturing with compliance to RoHS 3 and REACH regulations, making it safe for various global markets.

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw is engineered to address common industrial challenges such as fastener failure due to corrosion, vibration loosening, and inconsistent thread engagement. The passivated finish enhances the natural corrosion resistance of the stainless steel, making it ideal for applications in chemical processing, marine environments, and outdoor equipment where moisture and corrosive agents are present. The UNC coarse thread and Class 2A fit provide excellent thread engagement in a variety of materials, reducing the risk of stripping and ensuring a reliable hold even under dynamic loads. With a Phillips drive and rounded head profile, it offers ease of installation and a smooth surface finish, minimizing snagging and improving safety in machinery and structural assemblies. These features make it a top choice for OEMs and maintenance teams seeking durable, compliant fasteners for industrial screws applications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse threading (5/16"-18), ensuring compatibility and ease of use in various assemblies. It is manufactured in accordance with ASME B18.6.3 specifications, guaranteeing consistent quality and performance. Additionally, the product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global supply chains.