Core holes for thread (NPTF-Thread) : Drill Bits and other cutting tools online store 

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Core holes for thread (NPTF-Thread)

Gewindekennung Außendurchmesser (mm) Gänge je Inch Steigung (mm) Kernlochdurchmesser (mm)
1/16" NPTF 7.87 27 0.94 6
1/8" NPTF 10.217 27 0.94 8.25
1/4" NPTF 13.577 18 1.411 10.7
3/8" NPTF 17.016 18 1.411 14.1
1/2" NPTF 21.211 14 1.814 17.4
3/4" NPTF 26.566 14 1.814 22.6
1" NPTF 33.195 11.5 2.209 28.5
1 1/4" NPTF 41.952 11.5 2.209 37
1 1/2" NPTF 48.021 11.5 2.209 43.5
2" NPTF 60.06 11.5 2.209 55
2 1/2" NPTF 72.642 8 3.175 65.5
4" NPTF 113.913 8 3.175 107

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Created Sunday 09 October, 2011.
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