TM 55-1730-229-12
AC 320A0-OMM-000
TO 35C2-3-473-1
TM 1730-12/1
Standard Torque Limits in Inch-Pounds for Hose and Tube Coupling Nuts
Standard Torque Limits in Inch-Pounds for Hose and Tube Coupling Nuts
A
TUBE OD
HOSE SIZE
NUT HEX
B
C
D
E
135-150
100-120
9/16
105-115
135-145
50-65
1/4
-4
1/8
270-300
210-250
11/16
160-180
255-285
100-125
-6
1/2
450-500
340-420
265-295
475-525
210-250
-8
7/8
5/8
650-700
400-480
-10
1
355-375
665-735
300-350
900-1000
725-850
1 1/4
430-470
855-945
425-500
3/4
-12
1200-1400
900-1150
1 1/2
715-785
600-700
-16
1
1200-1400
950-1150
2
855-945
680-800
1 1/4
-20
Overtightening of hose and tube coupling nuts will cause thread and seal damage result-
ing in fitting leakage. Torque values are for threads lubricated with hydraulic fluid
(E197). antiseize compound (E75). petrolatum (E274). or aircraft and instrument
grease (E 189). as applicable.
NOTE
This table not applicable to permaswage nuts coupled to Rosan fittings.
TORQUE WRENCHES
700 to 1600 Inch-Pounds
30 to 150 Inch-Pounds
100 to 750 Inch-Pounds
KEY
A-Aluminum Permaswage tube coupling nuts.
B-Steel Permaswage tube coupling nuts.
C-Steel or aluminum flared fitting nuts, AN818, AN924, NAS591-593, and NAS594-596: used on aluminum tube'
D-Steel or aluminum flared fitting nuts, AN818, AN924, NAS591-593, and NAS594-596: used on steel tube'
E-Steel or aluminum flared fitting hose coupling nuts'
`Where use of a torque wrench would be difficult, use a conventional wrench to tighten coupling nuts. Tighten until a dis-
tinct increase in the torque required is noted. Continue tightening an additional 1/6 of a turn. Back off the nut. Again tighten
until a distinct increase in the torque required is noted. Continue tightening an additional 1/6 to 1/3 of a turn.
Standard Torque limits In Inch-Pounds for
Connecting Coupling Nuts to Rosan Fittings
HOSE SIZE
TUBE OD
NUT HEX
STEEL
ALUMINUM
-4
9/16
140-150
140-150
1/4
-6
11/16
290-300
250-260
3/8
-8
525-575
410-430
1/2
7/8
-10
1
5/8
735-805
530-550
-12
960-1000
660-690
3/4
1 1/4
1
-16
1 `/z
1360-1400
1110-1150
NOTES
I
1. Rosan fittings are used on the following hydraulic system components:
Utility Pressure Module
Flight Control Power Control Module
Utility Return Module
Lower Controls Module
Apu Start Module
ILCA Manifold
Apu Start Accumulator
Apu Motor Pump
Utility Cooler Reservoir
Flight Control Cooler Reservoir
2. Torque values are for fittings lubricated with hydraulic fluid (E197).
TORQUE WRENCHES
30 to 150 Inch-Pounds
700 to 1600 Inch-Pounds
100 to 750 Inch-Pounds
Change 1
