S-90585A602 5/16"-18 x 4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Precision thread engagement through Class 3A UNC coarse threading ensures reliable fastening in demanding conditions
• Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency with hex drive (3/16") allowing high-torque application without cam-out
• Full-threaded design provides maximum grip length and uniform load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH)

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver exceptional performance in corrosive and high-stress environments where fastener failure is not an option. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures reliable performance under vibration and heavy loads, while the passivated finish significantly enhances corrosion resistance beyond standard stainless steel. The UNC coarse threading with Class 3A fit provides superior thread engagement in various materials, reducing the risk of stripping. These fully threaded hex drive screws are engineered for applications requiring flush mounting in marine equipment, chemical processing systems, and outdoor infrastructure where environmental compliance and long-term durability are critical.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading (5/16"-18) ensuring consistent performance. Complies with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance for restricted substance control. Features include 82° countersink angle, 4" fully threaded length, and right-hand thread direction for standard industrial applications.