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Westward 3/8-18 NPT pipe tap, TiN coated, four flutes

Westward

Westward 5TWY1 Pipe Tap 3/8"-18 Semi-Bottoming 4 Flutes NPT

SKU CH-FN73-30MDE

A 3/8"-18 NPT pipe tap with four flutes and a semi-bottoming design cuts internal threads in holes drilled to .5625 in

  • Product typeHole, Drill, Bore & Wire Gauges
  • Creates precise NPT threads with 3/8"-18 semi-bottoming design
  • Four flutes clear chips efficiently during threading operations
  • High-speed steel with TiN coating resists wear on tough materials
  • Right-hand cutting suits standard pipe and conduit applications
  • 75 percent thread drill size of .5625 in ensures proper fit

Application Fit

The Westward 5TWY1 is a semi-bottoming pipe tap designed for cutting NPT threads in pipe and conduit. It suits maintenance technicians and fabricators who need to create or repair tapered pipe threads in steel or iron assemblies. Builders requiring a bottoming tap for blind holes or a different thread standard will need another tool.

Build Integration

The tap uses a 3/8"-18 NPT thread form with four flutes and a right-hand cut direction. A 75 percent thread drill size of 0.5625 in prepares the hole before tapping. High-speed steel construction with TiN coating resists wear during hand or machine operation. The 2 9/16 in overall length fits standard tap wrenches and holders.

Sustained Use

Four flutes distribute cutting load evenly across the tool face during extended threading passes. TiN coating reduces friction and heat buildup when cutting multiple holes in succession. High-speed steel retains hardness at elevated temperatures, maintaining thread accuracy over long production runs. Class 3B fit ensures consistent engagement without oversize threads.

How it compares

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

Price $26.99
Pricier than about 54% of the 2,474 comparable items (median $23.99).

Specifications

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

Questions about this item

Will the 3/8"-18 NPT tap maintain thread accuracy through a full day of production threading?

The tap is made from high-speed steel with a TiN coating and four flutes, a combination that resists wear and holds the 3B class of fit during extended use.

How much heat builds up in the 3/8"-18 NPT tap when cutting steel pipe continuously?

High-speed steel construction and the TiN coating reduce friction, limiting temperature rise during sustained right-hand threading operations.

What size drill bit must I already have to prepare holes for this 3/8"-18 NPT tap?

A 0.5625 inch drill bit is required to produce the 75 percent thread depth specified for this tap.

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