Imperial Tungsten Steel Taper and Plug Set - 1/4" x 18 NPT - TD079

This set includes high-quality taps suitable for both professional and occasional use. It features...

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B&QB&Q - 1/8" X 27 Npt Imperial Tungsten Steel Taper And Plug Set Td080
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eBay1/8"" x 27 NPT Imperial Tungsten Steel Taper and Plug Set TD080
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Product Information

Full details

The AB Tools 1/4" x 18 NPT Imperial Tungsten Steel Taper and Plug Set is designed for professional mechanics and home DIY enthusiasts who need to create or repair precise internal threads in piping and hardware. This set offers superior durability and material versatility due to its tungsten steel construction, though users should note it is specifically calibrated for NPT standard piping and requires a proper tap handle for effective operation.

All features

Model Part NumberTD079
BrandAB Tools

Extended Product Information

FAQs

What is the difference between a taper tap and a plug tap?

The taper tap has a longer lead-in with more tapered threads to help start the cut, while the plug tap has a shorter taper, allowing it to cut threads nearly to the bottom of a hole.

Can I use this set on stainless steel?

While the tungsten steel is hardened, stainless steel is significantly harder and more prone to work-hardening than standard steel; exercise extreme caution and use high-grade cutting fluid if attempting this.

Does this set include a tap handle?

No, the set includes only the taper and plug taps. A standard tap wrench or handle must be purchased separately.

Is this compatible with metric threads?

No, this set is specifically manufactured for 1/4" x 18 NPT (National Pipe Thread) applications and is not compatible with metric threads.

How should I store these tools?

Store them in a dry, clean box with a light coating of oil to prevent rust, and keep them organized to avoid damaging the precision threads.

Troubleshooting

Tap is hard to turn or feels like it is binding

Back the tap out, clear all metal shavings from the hole and the tap flutes, add more cutting oil, and proceed more slowly.

Thread is cross-threaded or damaged

If caught early, carefully realign the tap in the existing hole and slowly back it out; if the damage is deep, you may need a larger re-threading solution.

Pros and Cons

Pros

  • Durable hardened tungsten steel construction
  • Complete set with both taper and plug taps
  • Excellent for both professional workshops and occasional home repairs
  • Works reliably on soft metals like copper/aluminum and harder materials like steel

Cons

  • Requires separate purchase of a suitable tap handle
  • NPT threads are specific and not compatible with metric or standard machine threads
  • Requires manual labor and technical skill to ensure straight alignment

Setup, Compatibility & Care

To ensure the longevity of your TD079 set, proper setup is essential. First, secure your workpiece in a bench vise to prevent movement. Always ensure the tap is perfectly perpendicular to the workpiece surface to avoid cross-threading. When using the tools, turn the tap in small increments—half a turn forward followed by a quarter turn backward—to break off metal chips and prevent the tap from binding.

After use, clean the flutes of the taps with a wire brush to remove metallic debris. Apply a light coat of machine oil before storage to prevent oxidation. This set is specifically sized for 1/4" x 18 NPT applications and will not fit other thread sizes.

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