Import BDNA-20710 Straight Flute Tap 1/2-13 Unc Plug Hss

Product Description

The IMPORT BDNA-20710 is a straight flute hand tap designed for cutting internal threads in through-holes and shallow blind holes. Built from high-speed steel with a gold oxide coating, it cuts 1/2-13 UNC right-hand threads with a plug chamfer that balances starting ease with threading depth. The H3 thread limit provides the tight tolerance class needed for standard fit fastener applications. Overall length is 3-3/8 inches. This tap is used by machinists, maintenance technicians, pipefitters, and general tradespeople working in metal fabrication, repair, or on-site mechanical work.

The BDNA-20710 is suited for threading ferrous metals, cast iron, and softer alloys in both shop and field settings. The plug chamfer, with its moderate lead-in, is the most common tap type for general-purpose through-hole and moderately deep blind-hole threading. The 4-flute straight design provides chip clearance in materials that produce short, broken chips. This tap is sold individually and is appropriate for hand tapping or use in low-speed machine tapping setups.

Key Features

• 1/2-13 UNC thread form for standard unified coarse pitch internal threads
• Plug chamfer provides moderate starting lead — suitable for through-holes and deeper blind holes
• High-speed steel construction offers good wear resistance across a broad range of workpiece materials
• Gold oxide coating reduces friction and provides light corrosion protection during storage and use
• H3 thread limit ensures consistent tolerance fit for standard fastener assembly
• 4-flute straight design promotes chip control in short-chipping metals

Compatibility

Designed as a standard replacement or stock tap for 1/2-13 UNC internal thread cutting applications. Fits standard tap holders, T-handle wrenches, and machine tap chucks sized for 1/2-inch nominal taps.

Installation Notes

Tapping should be performed by a qualified machinist or tradesperson using appropriate cutting fluid to extend tool life and improve thread finish. Secure the workpiece fully before beginning; never tap freehand in critical structural or pressure-bearing applications. For machine tapping, use a low-speed, reversible drill press or tapping head to avoid tap breakage. Follow applicable shop safety standards and wear eye protection when hand tapping.