Hypertherm HyPrecision 50S - Hydraulic Fittings: NPT Torque Values

HyPrecision 50S/60S/75S Operator Manual 808690 183
8 – Pump specifications
Pump specifications
Hydraulic fittings
This table shows maximum values. The torque necessary to make a sufficient seal depends on the condition of
the pipe threads and can be much lower than the maximum.

Hypertherm recommends using thread sealant on all NPT hydraulic fittings.
Lubricate the O-rings with hydraulic fluid or O-ring lubricant before assembly.
NPT
Size
Standard maximum torque
Maximum torque value when
using thread sealant
(75% of standard maximum)
Maximum torque value when
using a male tapered pipe
thread with a female straight
or parallel pipe thread
(50% of standard maximum)
N∙m lbf∙ft N∙m lbf∙ft N∙m lbf∙ft
1/4 inch
34 25 26 19 18 13
3/8 inch
47 35 35 26 24 18
1/2 inch
61 45 46 34 31 23
3/4 inch
75 55 56 41 38 28
1inch
88 65 66 49 45 33
1-1/4 inch
1088081605440
1-1/2 inch
129 95 96 71 65 48