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Westward pipe tap 3/8 inch 18 NPT four flute semi-bottoming bright finish

Westward

Westward 5TWT9 Pipe Tap 3/8"-18 NPT 4 Flutes Semi-Bottoming

SKU CH-6105-B4Q2P

Cuts 3/8"-18 NPT threads with four-flute high-speed steel for accurate internal threading

  • Product typeHole, Drill, Bore & Wire Gauges
  • NPT threads for leak-resistant pipe connections
  • 3/8"-18 size fits standard plumbing fittings
  • Four flutes clear chips efficiently during tapping
  • Semi-bottoming design reaches near-blind hole depths
  • High-speed steel construction resists wear in repeated use

Westward 5TWT9 Pipe Tap

This Westward 5TWT9 pipe tap cuts internal NPT threads for 3/8 inch nominal pipe size at 18 threads per inch. It is made from high-speed steel with a bright uncoated finish and features four flutes in a semi-bottoming design. The tool suits maintenance technicians and fabricators who need reliable thread creation in pipe and conduit work.

Replacing worn taps or upgrading from two-flute

A dull or damaged tap produces loose threads that leak under pressure, so swapping in this four-flute high-speed steel version restores consistent engagement. The jump is worth it when thread quality must meet Class 3B fit and the 75 percent thread drill size of 0.5625 inch is used for the pilot hole.

Fitting into a pipe-threading setup

The tap requires a 0.5625 inch drill bit for the correct pilot hole and a tap wrench or powered driver that accepts its shank. Its 2 9/16 inch overall length and 1 1/16 inch thread length reach standard coupling depths, while the semi-bottoming chamfer starts easily and frees up chip clearance in blind or through holes.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 64% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameWestward
Product typeHole, Drill, Bore & Wire Gauges

Questions about this item

What drill size matches the 75 percent thread depth for the 3/8"-18 NPT tap?

Use a 0.5625 in drill to produce the correct 75 percent thread depth for this 3/8"-18 NPT tap.

How do you start the semi-bottoming tap straight in the hole?

Apply steady axial pressure while turning the tap clockwise; the semi-bottoming chamfer needs a square start to avoid cross-threading the 3/8"-18 threads.

When should the high-speed steel tap be replaced?

Replace the tap when the four flutes show rounded edges or the 3/8"-18 threads it cuts no longer gauge to Class 3B fit.

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