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Silver steel pipe tap with seven spiral flutes and tapered threads

Westward

Westward 5PXH8 Pipe Tap 1-1/2"-11-1/2 NPT 7 Flutes

SKU CH-8VSK-MS67F

Creates 1-1/2"-11-1/2 NPT threads with seven-flute high-speed steel construction for clean cutting

  • Product typeHole, Drill, Bore & Wire Gauges
  • Cuts NPT threads to 11 threads per inch
  • Seven flutes evacuate chips efficiently during tapping
  • High-speed steel construction resists wear on tough materials
  • Bright uncoated finish suits general-purpose threading tasks
  • Right-hand orientation matches standard pipe-fitting requirements

Threading capability

The Westward 5PXH8 is a pipe tap designed to cut internal NPT threads measuring 1-1/2"-11-1/2. It suits plumbers, pipefitters and maintenance technicians who need to create pressure-tight joints in steel or iron piping systems.

Sustained cutting behaviour

Seven flutes distribute the cutting load evenly across the high-speed steel body during extended threading operations. The taper lead engages the workpiece gradually, reducing the risk of chatter when the tap is driven continuously through the full 1 3/4 in thread length.

Heat, noise and power in use

The bright, uncoated finish relies on proper cutting fluid to manage friction and temperature during operation. Chip evacuation through the seven-flute design helps maintain consistent torque requirements on the driving tool throughout the cut.

How it compares

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

Price $157.99
Pricier than about 90% of the 2,474 comparable items (median $23.99).

Specifications

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

Questions about this item

How much heat does the 7-flute tap generate during extended threading?

The high-speed steel construction and 7 flutes help dissipate heat during continuous cutting, reducing the risk of overheating the workpiece or tap.

What drill size must I already have to prepare the hole for this 1-1/2"-11-1/2 NPT tap?

A 75 percent thread drill size of 1.7188 in is required to create the proper hole before tapping with this tool.

Will the 3B class of fit on this tap match threads cut by older NPT dies?

The 3B class of fit provides a tighter tolerance that is compatible with standard NPT threads produced by older tooling, ensuring proper engagement.

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