Import BDNA-20775 Straight Flute Tap 7/16-20 Unf Hss

Product Description

The IMPORT BDNA-20775 is a straight flute tap designed to cut internal threads in a 7/16-20 UNF configuration. It features 4 straight flutes and a taper chamfer, making it well suited for starting threads in through-holes or open-ended applications where chip evacuation is straightforward. The tap is manufactured from high-speed steel (HSS) and carries a gold oxide coating that provides moderate lubricity and corrosion resistance during cutting. This tool is used by machinists, maintenance technicians, pipefitters, and trade professionals who need to tap fine-pitch unified threads in steel, aluminum, cast iron, and similar materials.

This tap is a standard production and maintenance item for threading 7/16-20 UNF holes in ferrous and non-ferrous materials. The taper chamfer distributes the cutting load across the first 8 to 10 threads, reducing torque demand and the risk of tap breakage during entry. The H3 thread limit provides a controlled fit tolerance appropriate for standard UNF fastener assemblies. It is sold individually and is appropriate for use in hand tapping operations as well as machine tapping setups where a taper lead is preferred.

Key Features

• 7/16-20 UNF thread size with right-hand thread direction
• 4 straight flutes for rigidity and chip control in through-hole applications
• Taper chamfer distributes cutting load over the lead threads for easier starting
• High-speed steel construction for durability across a wide range of workpiece materials
• Gold oxide coating improves lubricity and provides light corrosion resistance
• H3 thread limit for consistent fit tolerance in standard UNF assemblies

Compatibility

Designed as a standard replacement or production tap for 7/16-20 UNF threading applications in maintenance, repair, and manufacturing environments.

Installation Notes

This tap is installed by a machinist or qualified technician using a tap wrench for hand tapping or a tapping head for machine use. Secure the workpiece firmly before starting and apply cutting fluid appropriate for the workpiece material to reduce heat and extend tap life. Back the tap off periodically during hand tapping to break chips and prevent binding. Follow applicable shop safety practices and ensure the tap is properly aligned with the drilled hole before applying torque.