S-90585A579 5/16"-18 x 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• High tensile strength of 70,000 psi ensures reliable fastening under significant mechanical stress
• Precise Class 3A thread fit provides excellent engagement and vibration resistance in demanding applications
• Passivated finish enhances surface durability and extends service life by preventing oxidation
• Hex drive design allows for high-torque installation and easy removal with standard tools
• Coarse UNC threading enables quick assembly and reduced cross-threading risks
• Full compliance with ASME B18.3 guarantees dimensional accuracy and interchangeability

Professional Applications & Engineering Value

This 316 stainless steel flat head screw is engineered to address critical challenges in industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threads and a Class 3A thread fit ensures secure fastening in materials prone to stress and vibration, such as machinery frames, marine equipment, and chemical processing systems. The hex drive facilitates efficient installation in confined spaces, while the passivated finish provides an additional barrier against corrosive agents, significantly reducing maintenance needs and downtime. Ideal for industrial applications requiring consistent performance under demanding conditions.

Specification Summary & Compliance

This screw adheres to ASME B18.3 specifications, ensuring precise dimensions including a 5/16"-18 UNC thread with Class 3A tolerance for optimal fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally sensitive and regulated industries. The 82° countersink angle and flat head profile meet standard requirements for flush mounting in various assemblies.