S-91781A608 5/16"-18 x 6" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable, heavy-duty fastening.
• Optimized flush mounting thanks to the standard flat head profile and 82° countersink angle for a smooth, secure finish.
• Enhanced assembly efficiency with a slotted drive and coarse UNC threading, allowing for quick and easy installation.
• Precise thread engagement ensured by Class 2A thread fit, reducing the risk of cross-threading and ensuring consistent performance.
• Versatile partial threading design provides a strong grip on materials while allowing for flexibility in various applications.
• Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH, guaranteeing safety and environmental standards are met.

Professional Applications & Engineering Value

This 5/16"-18 UNC Flat Head Screw is engineered to address common industrial challenges such as material fatigue and environmental degradation. Constructed from 18-8 Stainless Steel with a passivated finish, it offers excellent resistance to rust and chemicals, making it suitable for demanding sectors like machinery assembly, marine equipment, and outdoor structures. The partially threaded design and coarse thread spacing ensure a secure hold in soft or brittle materials, reducing the risk of stripping. Its 82° countersink angle and flat head profile allow for seamless integration into surfaces, minimizing protrusions and enhancing safety in high-traffic areas. By meeting ASME B18.6.3 standards, this screw delivers consistent performance in industrial applications, providing long-term reliability and reducing maintenance costs.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 2A thread fit and UNC coarse thread specifications, ensuring compatibility and ease of use. It is manufactured in compliance with ASME B18.6.3 standards for uniformity and performance. Additionally, it is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental safety and regulatory requirements in global markets.