Import BDNA-20727 Straight Flute Tap 9/16-12 Unc Hss

Product Description

The IMPORT BDNA-20727 is a straight flute tap designed to cut internal threads in ferrous and non-ferrous materials. It produces a 9/16-12 UNC right-hand thread and features four flutes with a taper chamfer, making it well suited for threading through-holes where chips can flow ahead of the tap. The tool is manufactured from high-speed steel (HSS) and finished with a gold oxide coating that provides light lubricity and surface hardness. Thread limit is H3, indicating a tolerance class appropriate for standard-fit UNC thread applications. Machinists, maintenance technicians, and general shop professionals install this tap using a tap wrench or machine tapping setup.

This tap is used wherever a 9/16-12 UNC internal thread is required, including general fabrication, maintenance and repair operations (MRO), and production machining of steel, cast iron, aluminum, and similar materials. The taper chamfer distributes the cutting load across the leading threads, which reduces the torque required to start the thread and extends tool life in typical shop applications. It is sold individually and suitable for both hand tapping and low-speed machine tapping.

Key Features

• 9/16-12 UNC thread form with right-hand thread direction
• Four straight flutes for efficient chip clearance in through-hole applications
• Taper chamfer distributes cutting load and eases thread starting
• High-speed steel construction provides toughness and wear resistance
• Gold oxide finish adds light surface protection and reduces friction
• H3 thread limit for standard-tolerance UNC thread fits

Compatibility

Designed as an OEM-style replacement or standard shop tap for applications requiring a 9/16-12 UNC straight flute taper tap in high-speed steel.

Installation Notes

This tap is installed by a machinist or maintenance technician using a tap wrench for hand tapping or a tapping attachment for machine use. Always apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Secure the workpiece firmly before tapping and keep the tap aligned perpendicular to the drilled hole to avoid tap breakage. Follow applicable shop safety practices when handling cutting tools.