S-92210A584 5/16"-18 x 7/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance thanks to 18-8 Stainless Steel construction and a passivated finish, ideal for harsh industrial environments.
• Superior load-bearing capability with a high tensile strength of 70,000 psi, ensuring reliable performance under stress.
• Precise and secure thread engagement achieved with a Class 3A thread fit and UNC coarse thread spacing, minimizing the risk of cross-threading.
• Optimized for flush mounting with a standard flat head profile and 82° countersink angle, providing a smooth, finished surface.
• Efficient installation and removal facilitated by a 3/16" hex drive, allowing for high torque application with standard tools.
• Full-length threading ensures maximum grip and holding power along the entire 7/8" length of the screw.
• Guaranteed material integrity with a Rockwell B55 hardness, offering a durable balance of strength and machinability.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Flat Head Screw is engineered to address critical challenges in demanding applications. The combination of a Class 3A thread fit and UNC coarse threading provides vibration resistance and rapid assembly, which is crucial in machinery, automotive, and structural frameworks. The passivated finish significantly enhances the innate corrosion resistance of the stainless steel, making it suitable for outdoor, marine, or chemical-exposed environments where fastener failure is not an option. Its flat head design with an 82° countersink ensures a secure, flush fit, preventing snagging and maintaining aerodynamic or aesthetic surfaces in fabricated metal products and enclosures. This screw delivers reliable industrial fastening where precision, strength, and long-term durability are paramount.

Specification Summary & Compliance

This product adheres to strict dimensional and performance standards, including a Class 3A thread fit for superior precision and a UNC (Unified Coarse) 5/16"-18 thread specification. It is manufactured in compliance with the ASME B18.3 standard for socket cap screws. Furthermore, this fastener is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances.