Import BDNA-20685 Tap Set 7/16-20 Unf Hss Gold Oxide 3 Pc

Product Description

The IMPORT BDNA-20685 is a 3-piece tap set cut for 7/16-20 UNF threads. Each tap in the set features 4 flutes and a high-speed steel (HSS) body with a gold oxide finish that provides light lubricity and oxidation resistance during cutting. The set includes all three chamfer styles — bottoming, plug, and taper — giving machinists and maintenance techs the full progression needed to cut clean, accurate threads from start to finish in a single kit. Overall length is 3-5/32 inches. Thread limit is H3, suitable for standard UNF tolerance fits.

This tap set is used in metal fabrication, industrial maintenance, and machine shop environments wherever 7/16-20 UNF threaded holes need to be cut or chased. The taper tap starts threads in blind or through holes, the plug tap continues the thread, and the bottoming tap carries threads to the base of a blind hole. The set suits work in steel, aluminum, and similar machinable metals. It is appropriate for hand tapping with a tap wrench or machine tapping at controlled speeds.

Key Features

• Three chamfer styles included: bottoming, plug, and taper for a complete thread-cutting progression
• High-speed steel construction for durability in a range of machinable metals
• Gold oxide finish provides light lubricity and corrosion resistance during use
• 4-flute design for efficient chip evacuation and thread accuracy
• H3 thread limit for standard UNF tolerance fits
• 3-5/32 inch overall length fits standard tap wrenches and holders

Compatibility

Designed for cutting 7/16-20 UNF threads per Unified National Fine thread standards. Suitable for use with standard tap wrenches, T-handle wrenches, and tapping heads sized for the 7/16-20 shank.

Installation Notes

Thread cutting should be performed by a qualified machinist or maintenance technician familiar with proper tapping procedure. Always use an appropriate cutting fluid or tapping compound to extend tool life and produce clean threads. Start with the taper tap to establish the thread, progress to the plug, and finish with the bottoming tap when threading to the bottom of a blind hole. Inspect the hole diameter against the recommended tap drill size for 7/16-20 UNF before beginning.