Import BDNA-20715 Straight Flute Tap 1-8 Unc Hss

Product Description

The IMPORT BDNA-20715 is a straight flute plug tap designed for cutting 1-8 UNC internal threads in a variety of materials. Built from high-speed steel (HSS) with a gold oxide coating, this tap resists heat and wear during threading operations. It features 4 flutes for efficient chip evacuation in through-hole and shallow blind-hole applications. With an overall length of 5.125 inches and a right-hand thread orientation, it fits standard tap holders and T-handle wrenches used in production and maintenance threading work. The H4 thread limit designation indicates a controlled oversize tolerance suitable for tapping into materials where plating or coating of the finished thread is anticipated.

This tap is suited for machine shops, maintenance facilities, and industrial service environments where 1-8 UNC threads are commonly produced or repaired. The plug chamfer style — typically 3 to 5 threads of taper — allows the tap to start easily in a pre-drilled hole and is the most common choice for general-purpose through-hole and moderately deep blind-hole tapping. It is appropriate for use in hand tapping and machine tapping setups on ferrous and non-ferrous metals.

Key Features

• Thread size: 1-8 UNC (1-inch diameter, 8 threads per inch, Unified National Coarse)
• Plug chamfer for easy starting in through-holes and shallow blind holes
• 4 straight flutes for chip clearance in a wide range of materials
• High-speed steel construction for heat resistance and tool longevity
• Gold oxide coating reduces friction and provides light corrosion resistance
• H4 thread limit for applications requiring plated or coated finished threads
• Right-hand thread direction, compatible with standard tapping equipment

Compatibility

Designed as a standard replacement or production tap for applications requiring 1-8 UNC right-hand internal threads. Fits standard 1-inch tap holders, T-handle wrenches, and machine tapping chucks sized for large-diameter taps.

Installation Notes

This tap should be installed by a machinist or qualified maintenance technician familiar with tapping procedures. Always ensure the workpiece is securely fixtured and the tap is properly aligned with the pre-drilled pilot hole before applying torque. Use an appropriate cutting fluid for the base material being tapped to reduce heat and extend tool life. For machine tapping, confirm spindle speed and feed rate are appropriate for the tap diameter and material before operation.