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Bright high-speed steel pipe tap with seven flutes

Westward

Westward 5TWX5 Pipe Tap 1-1/2"-11-1/2 Semi-Bottoming 7 Flutes NPTF

SKU CH-XHNB-1981R

A pipe tap cuts 1-1/2"-11-1/2 NPTF threads with seven flutes in a semi-bottoming design

  • Product typeKnives, Cutters & Snips
  • Cuts precise NPT threads with 7-flute design
  • Semi-bottoming style reaches near the base of blind holes
  • High-speed steel construction resists wear during repeated use
  • Bright uncoated finish suits general-purpose threading tasks
  • 75 % thread engagement matches 1.7188 in drill size

Westward 1-1/2" NPTF Pipe Tap

This Westward pipe tap cuts internal threads for 1-1/2 inch NPTF connections with a semi-bottoming design. It is built from high-speed steel with a bright uncoated finish and right-hand orientation. The tool suits maintenance technicians and pipefitters who need reliable thread cutting in steel or iron pipe.

For NPTF thread repair and new installations

The semi-bottoming chamfer and seven-flute layout help start threads cleanly and clear chips in through-holes or blind holes. Builders who need a taper-only NPT tap or a different thread class should look at other options because this tap is made to NPTF Class 3B specifications.

Thread size 1-1/2"-11-1/2 NPTF

This single specification decides whether the tap matches the fitting you are threading. The 75 percent thread drill size is 1.7188 in, and the thread length is 1 3/4 in. Verify the required thread form and size before purchase.

How it compares

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

Price $132.99
Pricier than about 90% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameWestward
Product typeKnives, Cutters & Snips

Questions about this item

What does the 1-1/2"-11-1/2 NPTF thread size mean for the finished thread?

The tap cuts an NPTF tapered pipe thread with 11 threads per inch on a nominal 1-1/2 inch size, producing a dryseal thread form that seals without sealant when mated correctly.

How does the NPTF standard affect the thread fit in practice?

NPTF threads are manufactured to a Class 3B fit with a 75 percent thread engagement, and the 7-flute high-speed steel tap uses a 1.7188 in drill size to achieve the required thread depth for pressure-tight joints.

What physical dimensions determine whether this tap fits my holder or workpiece?

The tap has an overall length of 4 1/4 in and a thread length of 1 3/4 in, with a right-hand cutting direction and bright uncoated finish for use in standard tap holders and through-hole or blind-hole applications.

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