S-90585A722 1/2"-13 x 2 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 and passivated finish, ideal for harsh chemical and marine environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high stress.
• Precise thread engagement with Class 3A fit and 1/2"-13 UNC coarse spacing, ensuring secure fastening and vibration resistance.
• Efficient installation using a 5/16" hex drive and standard 82° countersink angle for flush mounting and reduced assembly time.
• Full thread coverage along the 2 1/2" length provides maximum grip and load distribution in demanding applications.
• Regulatory compliance with ASME B18.3, RoHS 3, and REACH standards, guaranteeing safety and environmental responsibility.
• Durable flat head design maintains a low profile while withstanding repeated use in industrial settings.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 316 stainless steel flat head screws address critical challenges in corrosive and high-stress environments. The passivated finish enhances the inherent corrosion resistance of the material, making them suitable for chemical processing, marine hardware, and outdoor infrastructure where exposure to moisture and aggressive substances is common. The 1/2"-13 UNC coarse thread with Class 3A fit ensures quick assembly and reliable clamping force, reducing the risk of loosening under vibration. Combined with a 5/16" hex drive and 82° countersink angle, they facilitate efficient installation in pre-drilled holes, minimizing project downtime and improving structural integrity in heavy-duty fastening tasks.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC thread with Class 3A fit and coarse spacing, ensuring precise dimensional accuracy per industry standards. It complies with ASME B18.3 for mechanical and dimensional specifications, RoHS 3 (2015/863/EU) for restricted hazardous substances, and REACH (EC 1907/2006) for chemical safety, confirming its suitability for global regulatory requirements.