Import BDNA-20751 Straight Flute Tap 4-48 Unf Plug Hss

Product Description

The IMPORT BDNA-20751 is a straight flute tap designed for cutting internal threads in ferrous and non-ferrous materials. It produces a 4-48 UNF thread profile using three straight flutes and a plug chamfer, making it well suited for through-hole threading applications where chips can exit freely. The body is ground from high-speed steel and carries a gold oxide coating that provides light lubricity and improved wear resistance. At 1-7/8 inches overall length, it fits standard tap handles and machine setups used in precision machining and light fabrication work. Machinists, toolmakers, and maintenance technicians are the primary users of this tap.

This tap is appropriate for threading small-diameter holes in machine components, brackets, enclosures, and fixtures where a 4-48 UNF fine-thread fastener is required. The plug chamfer — typically 3 to 5 threads of lead — allows the tap to start easily in a drilled through-hole and is the most common style for general production and repair work. It is used in both manual and CNC tapping operations at low spindle speeds with appropriate cutting fluid.

Key Features

• 4-48 UNF thread form for fine-pitch small-diameter threading
• Plug chamfer for easy entry in through-hole applications
• 3 straight flutes for chip clearance in open through-holes
• High-speed steel construction for durability across common workpiece materials
• Gold oxide coating adds wear resistance and light lubricity
• H2 thread limit for consistent fit within standard tolerance range
• Right-hand thread direction — standard for most fastener applications

Compatibility

Designed as a standard replacement or stock tap for applications requiring a 4-48 UNF plug-style straight flute tap in high-speed steel.

Installation Notes

This tap is installed by hand or machine into a pre-drilled hole sized to the correct tap drill diameter for 4-48 UNF threads. Always use a quality cutting fluid or tapping compound to extend tool life and improve thread finish. Secure the workpiece firmly before tapping and back off the tap periodically to break chips and prevent binding. Replace worn or broken taps before reuse — a snapped tap in a blind hole is difficult to remove.