S-92210A593 5/16"-18 x 2 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, durable fastening under heavy loads.
• Precise, secure thread engagement thanks to Class 3A thread fit and UNC coarse threading, reducing the risk of cross-threading and loosening.
• Efficient installation and removal with a 3/16" hex drive, allowing for high torque application and easy maintenance.
• Flush, low-profile seating with a standard flat head and 82° countersink angle, minimizing protrusion for a smooth surface finish.
• Full threading along the 2-1/2" length provides consistent holding power and flexibility in material thickness.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 18-8 stainless steel flat head screw is engineered to address critical challenges in industrial and mechanical assemblies. Its passivated finish enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor elements, such as machinery, construction equipment, and marine hardware. The UNC coarse thread and Class 3A thread fit ensure quick, secure installation in soft materials like aluminum or wood, reducing assembly time and improving reliability. With a hex drive design, it allows for high-torque fastening without slippage, ideal for tight spaces in automotive, aerospace, or heavy-duty manufacturing. The combination of 70,000 psi tensile strength and full threading provides uniform stress distribution, preventing joint failure in dynamic load conditions and extending service life.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse thread spacing (5/16"-18). It meets ASME B18.3 specifications for consistency and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it ensures environmental safety and regulatory adherence for global supply chains.