Import BDNA-20680 Tap Set 5/16-18 Unc Hss Gold Oxide

Product Description

The IMPORT BDNA-20680 is a 3-piece tap set ground to 5/16-18 UNC thread specifications for use in through-hole and blind-hole threading applications. The set includes bottoming, plug, and taper chamfer taps, giving technicians the full sequence needed to cut clean threads from entry to bottom of a hole. All three taps are machined from high-speed steel and finished with a gold oxide coating that provides light lubricity and corrosion resistance during cutting. Overall length is 2-23/32 inches. The 4-flute geometry and H3 thread limit make this set suitable for threading mild steel, aluminum, and similar materials in maintenance, fabrication, and equipment repair work.

This tap set is suited for general metalworking tasks in HVAC, plumbing, electrical, and mechanical service environments where field repairs or component fabrication require threading 5/16-18 UNC holes. The inclusion of all three chamfer styles in one package allows a technician to start a thread with the taper tap, continue with the plug tap, and finish to the bottom of a blind hole with the bottoming tap without switching to a separate set. Sold as a 1-piece package quantity.

Key Features

• Three-piece set includes bottoming, plug, and taper chamfer taps for complete thread-cutting sequence
• 5/16-18 UNC thread standard with H3 thread limit for consistent tolerance control
• 4-flute design provides balanced chip clearance in ferrous and non-ferrous materials
• High-speed steel construction maintains cutting edge integrity under standard hand-tap and machine-tap loads
• Gold oxide finish delivers light lubrication and surface protection during use
• Overall length of 2-23/32 inches compatible with standard tap handles and tap wrenches

Compatibility

Designed for use in any application requiring 5/16-18 UNC internal threads; fits standard tap handles and T-handle wrenches sized for this thread range.

Installation Notes

Threading work should be performed by a qualified machinist or technician familiar with proper tap alignment and cutting fluid use. Always secure the workpiece firmly before tapping, use an appropriate cutting fluid for the base material, and back the tap out periodically to break chips and prevent tap breakage. Follow applicable shop safety practices and relevant trade codes when threading components for pressurized or load-bearing assemblies.