S-91773A593 5/16"-18 x 2 1/2" 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, ideal for harsh environments.
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable, heavy-duty load-bearing.
• Optimized fastening efficiency with a No. 3 Phillips drive and rounded head for secure, easy installation and reduced cam-out.
• Durable, precise threading featuring UNC coarse thread and Class 2A fit for quick engagement and vibration resistance in industrial assemblies.
• Versatile partial threading allowing unthreaded shank sections for precise clamping and alignment in varied material thicknesses.
• Compliance with major standards including ASME B18.6.3, ensuring dimensional consistency and interchangeability.
• Environmentally safe manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 18-8 stainless steel rounded head screw combines high tensile strength and a passivated finish to combat corrosion in moisture-rich or chemical-exposed environments. The partially threaded design with UNC coarse threads ensures rapid installation and secure clamping in assemblies where vibration loosening is a concern, such as machinery, automotive frames, and structural supports. Its Phillips drive (No. 3 size) and rounded head profile facilitate efficient torque application, reducing tool slippage and improving workflow in high-volume production lines. By meeting ASME B18.6.3 specifications, it delivers consistent performance and interchangeability, making it a trusted heavy-duty fastener for OEMs and maintenance teams seeking longevity and reliability.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and UNC coarse threading (5/16"-18) per standard inch measurements. It is manufactured in compliance with ASME B18.6.3 for mechanical and dimensional integrity. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances.