S-97595A564 4-40 x 3/8" ASME B18.3 Brass Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from high-quality brass material, ideal for harsh or humid environments without compromising integrity.
• Precise Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening or cross-threading in critical assemblies.
• High tensile strength of 50,000 psi provides reliable load-bearing capacity for demanding mechanical applications.
• Rockwell B55 hardness offers excellent durability and resistance to wear, extending the screw's service life.
• Standard 82° countersink angle allows for flush mounting, reducing protrusion and improving aesthetic and safety in finished products.
• Fully threaded design maximizes grip and distribution of clamping force along the entire length for enhanced joint stability.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.

Professional Applications & Engineering Value

This 4-40 UNC brass flat head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and precise fit requirements. Made from durable brass, it naturally resists rust and galvanic corrosion, making it ideal for electrical enclosures, marine equipment, and plumbing systems where moisture exposure is frequent. The Class 3A thread fit and coarse thread spacing ensure quick installation and reliable performance in high-vibration environments, reducing maintenance needs. With a 1/16" hex drive and flat head profile, it offers easy torque application and a sleek finish, suitable for applications in aerospace, automotive, and precision instrumentation where space and appearance are critical.

Specification Summary & Compliance

This screw features a 4-40 UNC thread size with Class 3A precision thread fit, ensuring tight tolerances per ASME B18.3 standards. Dimensions include a 3/8" length, 0.224" head diameter, and right-hand thread direction. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), meeting environmental and safety regulations for industrial use.