NPTF Threads

 

The difference between NPT and NPTF threads is that NPTF pipe fittings do not require additional sealants such as hemp or Teflon tape. Due to the conical arrangement of the thread, it is self-sealing. Visually, it is difficult to distinguish between the two types of thread; this is only possible by precise measurement.

 

NPTF Threads Chart

Thread

Sizes

Thread Pitch

(mm)

Outer Diameter

(mm)

Core Hole Diameter

(mm)

Gear number

pro Inch

 NPTF 1/16" 0,941 7,90 6,15 27
 NPTF 1/8" 0,941 10,24 8,40 27
 NPTF 1/4" 1,411 13,62  11,00 18
 NPTF 3/8"  1,411 17,06 14,50 18
 NPTF 1/2"  1,814 21,22 17,75 14
 NPTF 3/4"  1,814 26,57 23,00 14
 NPTF 1"  2,209 33,23 29,00 11,5
 NPTF 1 1/4"  2,209 41,99 37,50 11,5
 NPTF 1 1/2"  2,209 48,05 44,00 11,5
 NPTF 2"  2,209 60,09 56,00 11,5
 NPTF 2 1/2"  3,175 72,70 66,50 8
 NPTF 3"  3,175 88,61 82,50 8

* All information without guarantee.

Tip !

Pipe thread Sealing cord or sealing tape.