<P> The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length ( ⁄ inch per foot or 62.5 millimeters per meter ) measured by the change of diameter ( of the pipe thread ) over distance of thread . The angle between the taper and the center axis of the pipe is tan ( ​ ⁄ ) = 1.7899 ° = 1 ° 47 ′ 24 '' . </P>
<P> The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length ( ⁄ inch per foot or 62.5 millimeters per meter ) measured by the change of diameter ( of the pipe thread ) over distance of thread . The angle between the taper and the center axis of the pipe is tan ( ​ ⁄ ) = 1.7899 ° = 1 ° 47 ′ 24 '' . </P>
basic dimensions for npt american national taper pipe threads
basic dimensions for npt american national taper pipe threads
1 inch of diameter in 16 inches of length
1 inch of diameter in 16 inches of length