TM 55-1730-229-12
AG 320AO-OMM-000
TO 35C2-3-473-1
TM 1730-12/1
Standard Torque Limits In Inch-Pounds for Pipe Thread Fittings
Standard Torque Limits in Inch-Pounds for Pipe Thread Fittings
Be careful when tightening pipe fittings. Overtightening causes distortion, crack-
ing, and leaks.
WORKING TORQUE1
MAXIMUM TORQUE1
THREAD SIZE
100
175
1/8-27
1/4-18
300
150
225
450
3/8-18
TORQUE WRENCHES
30 to 150 Inch-Pounds
100 to 750 Inch-Pounds
1
Antiseize compound (E75) shall be used on threads to prevent seizing and to aid in
sealing. The compound shell be applied IO the male fitting so that it does not contami-
nate the fluid in the system. Male and female fittings should be of different materials
Bulkhead Fitting Hole Diameter, Washer Thickness, and Nut Torque Limits
Be careful when tightening pipe fittings. Overtightening causes distortion, cracking,
and leaks.
TORQUE
BULKHEAD
(IN-LB)
WASHER
HOLE
AN924 NUT
THICKNESS
DIA (IN.)
TUBE FITTING
TUBE
MIN
MAX
MIN
MAX
OD (IN.)
THREAD
(IN.)
SIZE
-4
1/4
7/16-20
.443
.463
.063
85
105
-5
5/16
1/2-20
.505
.525
.063
105
125
-6
3/8
9/10-18
.568
.588
.063
120
150
-8
7/8-14
.880
5/8
280
.990
320
.090
-10
1/2
3/4-16
.755
.775
.090
240
380
.090
1-1/16-12
1.068
-12
3/4
1.088
500
600
-16
1.0
1-5/16-12
1.318
1.338
.090
720
880
-20
1-1/4
1-5/8-12
1.630
1.650
.090
960
1200
D-7/(D-8 Blank)
Change 1
