S-90086A664 4-40 x 3/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior thread cutting performance in aluminum, brass, cast iron, and sheet metal without pre-tapped holes, reducing installation time and labor costs.
• Enhanced corrosion resistance with the black-oxide steel finish, providing durable protection in various industrial environments.
• Secure and flush mounting thanks to the standard flat head with an 82° countersink angle, ensuring a smooth surface finish and improved aesthetics.
• Efficient drive engagement with the Phillips No. 1 drive style, minimizing cam-out risks and allowing for high-torque applications.
• Reliable coarse UNC threading (4-40 size) for quick assembly and strong holding power in softer materials, ideal for high-vibration settings.
• Full threading along the 3/8" length maximizes grip and distributes load evenly, enhancing joint integrity in demanding applications.
• Precision compatibility with a No. 41 drill bit (0.096" diameter), ensuring accurate hole sizing and reducing the risk of material damage during installation.

Professional Applications & Engineering Value

These 4-40 UNC thread cutting tapping screws are engineered to address common challenges in metalworking and assembly, such as stripping threads and inconsistent fastening in aluminum, brass, cast iron, and sheet metal. The black-oxide steel material offers excellent durability and resistance to oxidation, while the thread cutting design (Type F) creates precise, strong threads without the need for separate tapping operations. This reduces assembly steps and minimizes tool wear, making them ideal for high-volume production lines. The flat head with Phillips drive ensures a secure, flush fit in countersunk holes, preventing protrusions that could interfere with machinery or safety. By integrating these screws, industries can achieve faster, more reliable fastening in applications like automotive panels, electronic enclosures, and structural metal frames, ultimately lowering total cost of ownership.

Specification Summary & Compliance

This product adheres to Class 2A thread tolerances under the UNC coarse thread system, ensuring precise fit and interchangeability. It meets ASME B18.6.3 specifications (referencing SAE J933) for dimensional accuracy and performance, and is fully RoHS 3 (2015/863/EU) compliant, supporting environmental and safety standards in global supply chains. Key details include a right-hand thread direction, fully threaded shank, and compatibility with standard industrial drill bits for consistent application across various sectors.