1/4 NPT Plug with Hex Head, Let's Race Aluminium

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Let's Race

1/4 NPT Plug with Hex Head, Let's Race Aluminium

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In stock
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Tapered NPT plug for closing an unused port. The external hex head takes an open-ended spanner. The 1/4 NPT thread measures 13.6 mm across the outside, with 18 threads per inch, and seals on the taper with tape or paste.

Specifications

Thread 1/4 NPT
Thread outside diameter 13.6 mm
Threads per inch 18
Head external hex
Sealing tapered thread, with tape or paste
Material anodised aluminium

Application

  • Closes an unused NPT port on a pump, fuel rail, distribution block or filter housing.
  • Measure the thread before ordering: with NPT the number is not the diameter, see the table below.

What the NPT size means

The number in front of NPT is not a diameter. It is a nominal pipe size, inherited from plumbing, and the thread measured with a caliper always comes out larger. What you find on the part:

Size Thread outside diameter Threads per inch
1/8 NPT 10.2 mm 27
1/4 NPT 13.6 mm 18
3/8 NPT 17.1 mm 18
1/2 NPT 21.2 mm 14
3/4 NPT 26.6 mm 14

So a 1/8 NPT measures over 10 mm, not 3 mm. The thread has a 1:16 taper, it narrows as it goes in, and that is why it seals by itself: fit it with tape or sealing paste and tighten until you feel it, not to the stop. Dimensions are from ANSI/ASME B1.20.1.

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