Import BDNA-20765 Straight Flute Tap 1-12 Unf Hss

Product Description

The IMPORT BDNA-20765 is a straight flute plug tap designed to cut internal threads in ferrous and non-ferrous materials. Built from high-speed steel with a gold oxide coating, it handles 1-12 UNF threading with 4 flutes and a plug chamfer that eases thread entry in through-hole and blind-hole applications. The overall length is 5.125 inches. With a right-hand thread direction and H4 thread limit tolerance, this tap is suited for machinists, maintenance technicians, and toolroom work requiring precise UNF thread production in standard production or repair operations.

This tap is used in applications where a 1-inch, 12-threads-per-inch Unified National Fine thread is required. The plug chamfer — typically 3 to 5 threads of taper — makes it a general-purpose choice for starting threads in both through holes and sufficiently deep blind holes. Typical applications include fabrication shops, MRO maintenance environments, and field repair scenarios where UNF fastener threads need to be cut or restored in metal workpieces.

Key Features

• 1-12 UNF thread form with right-hand thread direction
• 4 straight flutes for chip clearance in standard materials
• Plug chamfer for general-purpose through-hole and blind-hole threading
• High-speed steel construction for durability across a range of metals
• Gold oxide coating reduces friction and provides basic corrosion resistance
• H4 thread limit for controlled tolerance in precision threading

Compatibility

Designed as a standard straight flute plug tap for cutting 1-12 UNF internal threads in compatible ferrous and non-ferrous materials using appropriate tapping equipment.

Installation Notes

Installation requires a tap wrench, tapping handle, or machine tool capable of controlling alignment and feed rate. Always apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Ensure the tap is aligned perpendicular to the workpiece surface before starting the thread to avoid thread damage or tap breakage. Reverse the tap periodically when hand-tapping to break chips.