Import BDNA-20690 Tap Set 5/8-11 Unc Hss Gold Oxide

Product Description

The IMPORT BDNA-20690 is a 3-piece tap set designed for cutting 5/8-11 UNC internal threads in metal workpieces. The set includes bottoming, plug, and taper chamfer taps, allowing a technician to start, progress, and finish a threaded hole in sequence. All three taps are ground from high-speed steel (HSS) with a gold oxide finish to reduce friction and improve chip flow. Each tap features 4 flutes and carries an H3 thread limit for consistent tolerance control. Overall length is 3-13/16 inches. This set is used by machinists, maintenance mechanics, and trade professionals who need to create or restore 5/8-11 UNC threads in steel, cast iron, or similar ferrous materials.

The BDNA-20690 tap set is suited for general metalworking, maintenance and repair operations (MRO), and fabrication environments where 5/8-11 UNC threads are required. The three-chamfer configuration makes it practical for both through-hole and blind-hole applications. Taper chamfer taps are used to start the thread, plug taps continue it, and bottoming taps finish threads to the bottom of blind holes. This set covers the full sequence in one package, reducing the need to source individual taps separately.

Key Features

• Three-piece set includes bottoming, plug, and taper chamfer taps for full thread progression
• 5/8-11 UNC thread form for standard unified coarse thread applications
• 4-flute design promotes chip evacuation and thread accuracy
• High-speed steel construction provides hardness and wear resistance in ferrous materials
• Gold oxide finish reduces friction and provides light corrosion resistance during storage and use
• H3 thread limit ensures consistent fit with standard UNC fastener tolerances

Compatibility

Designed for cutting 5/8-11 UNC threads per the Unified National Coarse thread standard. Suitable for use with standard 5/8-11 UNC tapping drill sizes in steel, cast iron, and similar materials.

Installation Notes

Tap installation should be performed by a qualified machinist or maintenance mechanic familiar with proper tapping technique and speeds. Always use an appropriate cutting fluid or tapping oil to extend tool life and improve thread quality. Secure the workpiece firmly before threading and align the tap perpendicular to the hole. Back the tap out periodically to break chips, especially in blind-hole applications.