Import BDNA-20726 Straight Flute Tap 1/2-13 Unc Hss

Product Description

The IMPORT BDNA-20726 is a straight flute tap designed for cutting internal threads in through-holes and blind holes where chip evacuation is straightforward. Built from high-speed steel (HSS) with a gold oxide coating, this tap offers improved lubricity and moderate wear resistance suited for production and maintenance threading work. It cuts a 1/2-13 UNC right-hand thread with a taper chamfer, which distributes the cutting load gradually across the lead threads and makes it easier to start the tap square to the workpiece. With four flutes and an H3 thread limit, it holds tight tolerances appropriate for standard UNC class-fit applications.

This tap is used in machine shops, maintenance facilities, and field service environments where 1/2-13 UNC threaded holes are required in ferrous and non-ferrous materials. The taper chamfer style makes it particularly well-suited for through-hole applications or wherever starting alignment is a priority. It is appropriate for use in manual tapping, drill press tapping, and CNC tapping operations at controlled feed rates. Machinists, millwrights, and general maintenance technicians are the typical end users.

Key Features

• 1/2-13 UNC thread form with right-hand thread direction
• Taper chamfer distributes cutting load for easier starting and straighter entry
• High-speed steel construction provides durability across a wide range of materials
• Gold oxide coating reduces friction and provides basic corrosion resistance
• H3 thread limit suits standard class-fit UNC tolerance requirements
• Four straight flutes for chip clearance in through-hole threading operations

Compatibility

Designed as a standard 1/2-13 UNC straight flute taper tap for use in manual and machine tapping setups compatible with this thread size and form.

Installation Notes

Tapping should be performed by a qualified machinist or maintenance technician using a calibrated tap handle, drill press, or CNC tapping cycle with appropriate feed control. Always drill the correct tap drill size for 1/2-13 UNC before tapping, and apply cutting fluid suitable for the workpiece material. Avoid excessive torque or side loading, which can cause tap breakage. For blind holes, use a bottoming or plug tap to finish threads close to the bottom after using this taper tap to start.