Import BDNA-20768 Straight Flute Tap 6-40 Unf Hss

Product Description

The IMPORT BDNA-20768 is a straight flute tap designed for cutting internal threads in ferrous and non-ferrous materials. It produces a 6-40 UNF right-hand thread using a taper chamfer, which distributes cutting load progressively across the first few threads and helps guide the tap into the workpiece during entry. The body is machined from high-speed steel and carries a gold oxide coating that reduces friction and provides light corrosion resistance. Three straight flutes provide chip clearance and are suited for through-hole tapping in shorter-chipping materials. The H2 thread limit specifies a controlled oversize tolerance range appropriate for standard fits.

This tap is intended for use in threading operations where a 6-40 UNF thread form is required. The 6-40 designation refers to a No. 6 diameter screw with 40 threads per inch, a fine-pitch thread common in small mechanical assemblies, instrument work, and light-duty fastening applications. Taper chamfer geometry makes this tap suitable for machine tapping or hand tapping in production and maintenance settings. It is a single-piece, individual-use tap packaged at a quantity of one.

Key Features

• 6-40 UNF thread form with right-hand thread direction
• Taper chamfer distributes cutting force gradually for smooth thread entry
• Three straight flutes provide chip clearance in through-hole applications
• High-speed steel construction handles a range of workpiece materials
• Gold oxide coating reduces friction and adds light corrosion resistance
• H2 thread limit for controlled oversize tolerance in standard-fit applications

Compatibility

Designed as a standard replacement or production tap for any application requiring a 6-40 UNF internal right-hand thread.

Installation Notes

This tap should be installed in a tap wrench or machine tap holder appropriate for the shank size. Ensure the workpiece is secured and that the pilot hole is drilled to the correct tap drill diameter for 6-40 UNF before beginning the tapping operation. Apply cutting fluid appropriate to the workpiece material to extend tap life and improve thread finish. Do not force the tap if resistance increases unexpectedly, as breakage in small-diameter taps is common when excessive torque is applied.