Import BDNA-20686 Tap Set 1/2-13 Unc Hss Gold Oxide

Product Description

The IMPORT BDNA-20686 is a 3-piece tap set designed for cutting 1/2-13 UNC internal threads in ferrous and non-ferrous metals. The set includes bottoming, plug, and taper chamfer styles, allowing the technician to start, progress, and finish a threaded hole in sequence using the correct chamfer for each stage. Made from high-speed steel (HSS) with a gold oxide finish, this set handles moderate heat and wear under production or maintenance conditions. Overall length is 3-3/8 inches, and each tap features 4 flutes for efficient chip evacuation. Thread limit is H3, appropriate for standard tolerance fits on 1/2-13 UNC fastener applications.

This tap set is used in maintenance, repair, and manufacturing environments where 1/2-13 UNC threads need to be cut or restored. Typical applications include threading holes in steel brackets, equipment frames, pipe flanges, and structural components common in HVAC, plumbing, and industrial mechanical work. The three-chamfer combination makes this set practical for through-holes and blind holes alike. It is suited for use in a drill press, tapping machine, or by hand with a standard tap wrench.

Key Features

• Three-piece set includes bottoming, plug, and taper chamfer taps for complete threading sequences
• 1/2-13 UNC thread form for standard unified coarse fastener applications
• High-speed steel construction for durability across ferrous and non-ferrous materials
• 4-flute design promotes efficient chip clearing during cutting
• Gold oxide finish provides light lubricity and surface protection
• H3 thread limit for standard tolerance class fits

Compatibility

Designed for cutting 1/2-13 UNC threads and is compatible with standard 1/2-13 tap handles, tap wrenches, and tapping heads that accept this shank size and thread form.

Installation Notes

Tapping operations should be performed by a qualified machinist or mechanical tradesperson following standard shop safety practices. Always use appropriate cutting fluid to reduce friction and extend tap life. Secure the workpiece firmly before beginning to prevent movement during tapping. Start with the taper tap, follow with the plug, and finish with the bottoming tap when threading blind holes to achieve full thread depth.