Import BDNA-20709 Straight Flute Tap 7/16-14 Unc Hss

Product Description

The IMPORT BDNA-20709 is a straight flute plug tap designed for cutting right-hand internal threads in through holes and blind holes where chip clearance is manageable. Built from high-speed steel with a gold oxide coating, it cuts 7/16-14 UNC threads with a 4-flute straight flute geometry. The plug chamfer — typically 3 to 5 threads — makes it a general-purpose choice that balances starting ease with thread engagement. With an overall length of 3-5/32 inches and an H3 thread limit tolerance, it is suited for tapping steel, cast iron, and similar ferrous materials in production or maintenance settings. Machinists and maintenance technicians are the primary users.

This tap is used in general metalworking, industrial maintenance, and fabrication applications where 7/16-14 UNC threaded holes are required. The plug chamfer style makes it appropriate for both through holes and moderately deep blind holes. It is a single-piece hand or machine tap sold individually, making it well suited for job-shop use, field maintenance work, and toolroom stock.

Key Features

• 7/16-14 UNC thread form for standard unified coarse pitch applications
• 4 straight flutes for balanced cutting action and chip control
• Plug chamfer (3-5 thread lead) for versatile use in through and blind holes
• High-speed steel construction for durability across ferrous and general-purpose materials
• Gold oxide coating reduces friction and provides light corrosion resistance
• H3 thread limit tolerance for controlled fit in standard UNC threaded assemblies

Compatibility

Designed as a standard straight flute plug tap for cutting 7/16-14 UNC right-hand internal threads; compatible with hand tap wrenches and machine tap holders accepting standard shank dimensions for this thread size.

Installation Notes

A licensed machinist or qualified maintenance technician should select the correct tap drill size for 7/16-14 UNC before use. Secure the workpiece firmly and use cutting fluid appropriate for the material being tapped to extend tool life and improve thread finish. For machine tapping, ensure the spindle is aligned with the pre-drilled hole to prevent tap breakage. Inspect the tap for wear or chipping before each use and replace if cutting edges are degraded.