S-97595A563 4-40 x 5/16" ASME B18.3 Brass Hex Drive Flat Head Screws
Brass Hex Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance from high-quality brass material, ideal for humid or demanding environments.
- Exceptional thread reliability with Class 3A precision fit, ensuring tight, secure fastening and reduced risk of loosening.
- High tensile strength of 50,000 psi provides robust load-bearing capacity for durable assemblies.
- Flush, professional finish thanks to the 82° countersink angle and flat head design, preventing snagging and improving aesthetics.
- Easy installation and removal with a 1/16" hex drive, offering better torque transmission and reduced tool slippage.
- Coarse UNC threading enables quick assembly and strong holding power in a variety of materials.
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees consistent quality, safety, and environmental standards.
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 assembly efficiency. The brass construction offers inherent resistance to rust and galvanic corrosion, making it suitable for electrical enclosures, marine hardware, and plumbing systems where moisture is a concern. The Class 3A thread fit and coarse thread spacing ensure rapid installation and reliable performance in soft metals or plastics, reducing assembly time while maintaining joint integrity. With a fully threaded design and flat head profile, it provides consistent clamping force and a smooth surface finish, essential for applications in aerospace, automotive, and precision instruments where flush mounting and corrosion resistance are critical.
Specification Summary & Compliance
This screw adheres to inch system dimensions with a Class 3A thread fit for precise tolerances, UNC coarse threads, and a length of 5/16". It meets ASME B18.3 specifications for consistent manufacturing quality, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses.
