S-97595A559 2-56 x 1/2" ASME B18.3 Brass Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with brass construction, ideal for harsh industrial environments and electrical applications
• Precise, reliable fastening ensured by Class 3A thread fit for minimal backlash and secure connections
• High mechanical strength with 50,000 psi tensile strength and Rockwell B55 hardness for durable, long-lasting performance
• Efficient installation and removal with hex drive design providing excellent torque transfer and reduced cam-out risk
• Optimal flush mounting thanks to the standard 82° flat head profile and fully threaded design
• Wide compatibility with UNC coarse threading and right-hand direction for common assembly requirements
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental directives (RoHS 3, REACH)

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, this 2-56 UNC brass flat head screw combines material excellence with precision manufacturing. The brass material offers inherent corrosion resistance, making it suitable for electronics, marine components, and plumbing systems where moisture exposure is a concern. The hex drive 0.050" and Class 3A thread fit ensure reliable torque application and vibration resistance, critical in machinery and equipment assembly. With its fully threaded design and 82° countersink angle, it provides secure, flush mounting in pre-drilled holes, reducing protrusion risks in compact spaces. These flat head screws deliver consistent performance in automated production lines, electrical enclosures, and precision instruments, where tensile strength and thread accuracy are paramount for operational safety and longevity.

Specification Summary & Compliance

This screw adheres to ASME B18.3 specifications, with UNC coarse thread spacing and Class 3A thread fit for high precision. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety. Dimensions include a 1/2" length, 0.086" thread diameter, and standard right-hand thread direction, manufactured to consistent hardness (Rockwell B55) and tensile (50,000 psi) standards.