S-97595A565 4-40 x 1/2" 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 with brass construction, ideal for harsh industrial environments requiring long-term reliability.
- Exceptional tensile strength of 50,000 psi ensures secure, vibration-resistant fastening in demanding applications.
- Precision Class 3A thread fit guarantees consistent, reliable engagement and reduces the risk of cross-threading.
- 82° countersink angle with standard flat head profile provides a flush, professional finish that enhances aesthetic and functional integrity.
- Hex drive design (1/16") allows for high-torque installation and easy removal with standard tools, improving assembly efficiency.
- Fully threaded coarse UNC pattern offers rapid installation and strong holding power in a variety of materials.
- Rockwell B55 hardness provides excellent durability and resistance to wear, extending the screw's service life.
Professional Applications & Engineering Value
Engineered for precision and durability, these 4-40 UNC brass flat head screws address critical challenges in electronics, machinery, and marine applications where corrosion resistance and reliable fastening are paramount. The brass material inherently resists rust and galvanic corrosion, making these screws ideal for environments exposed to moisture or chemicals. The Class 3A thread fit and coarse UNC threading ensure quick, secure assembly with minimal risk of stripping, while the 82° countersink angle allows the screw to sit flush, preventing snagging and improving safety. Combined with a hex drive for high torque application, these screws deliver consistent performance in assemblies requiring repeated maintenance or exposure to vibration, reducing downtime and maintenance costs.
Specification Summary & Compliance
This screw adheres to ASME B18.3 standards, ensuring dimensional accuracy and interchangeability. Thread specifications include 4-40 UNC coarse threads with a Class 3A fit for precise tolerance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for use in regulated industries.
