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NPT American Taper Pipe Thread
ANSI B 1.20.1

Specifications of International Thread Standards
       American Taper Pipe Thread, with sealant compound.
Nominal Diameter Major Diameter
mm		 Tapping
Drill Size
mm		 TPI Pitch
mm
1/16" NPT 7,895 6,00 27 0,941
1/8" NPT 10,242 8,25 27 0,941
1/4" NPT 13,616 10,70 18 1,411
3/8" NPT 17,055 14,10 18 1,411
1/2" NPT 21,223 17,40 14 1,814
3/4" NPT 26,568 22,60 14 1,814
1" NPT 33,228 28,50 11,5 2,209
1 1/4" NPT 41,985 37,00 11,5 2,209
1 1/2" NPT 48,054 43,50 11,5 2,209
2" NPT 60,092 55,00 11,5 2,209
2 1/2" NPT 72,699 65,50 8 3,175
3" NPT 88,608 81,50 8 3,175
3 1/2" NPT 101,316 94,30 8 3,175
4" NPT 113,973 107,00 8 3,175
5" NPT 141,300 134,384 8 3,175
6" NPT 168,275 161,191 8 3,175
8" NPT 219,075 211,673 8 3,175
10" NPT 273,050 265,311 8 3,175
12" NPT 323,850 315,793 8 3,175

NPT Thread
 

 

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