INTRODUCTION
Torque - Standard torque data for hydraulics
Installation of adjustable fittings in straight
thread O-ring bosses
1. Lubricate the O-ring by coating it with a light oil or
petroleum. Install the O-ring in the groove adjacent
to the metal backup washer which is assembled at the
extreme end of the groove
(4)
.
2. Install the fitting into the SAE straight thread boss until
the metal backup washer contacts the face of the boss
(5)
.
NOTE:
Do not over tighten and distort the metal
backup washer.
3. Position the fitting by turning out (counterclockwise)
up to a maximum of one turn. Holding the pad of the
fitting with a wrench, tighten the locknut and washer
against the face of the boss
(6)
.
23085659
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Standard torque data for hydraulic tubes and fittings
Tube nuts for 37° flared fittings
O-ring boss plugs
adjustable fitting
locknuts, swivel JIC-
37° seats
Size
Tubing OD
Thread
size
Torque
Torque
4
6.4 mm
(
1/4 in
)
7/16-20
12 – 16 N·m
(
9 – 12 lb ft
)
8 – 14 N·m
(
6 – 10 lb ft
)
5
7.9 mm
(
5/16 in
)
1/2-20
16 – 20 N·m
(
12 – 15 lb ft
)
14 – 20 N·m
(
10 – 15 lb ft
)
6
9.5 mm
(
3/8 in
)
9/16-18
29 – 33 N·m
(
21 – 24 lb ft
)
20 – 27 N·m
(
15 – 20 lb ft
)
8
12.7 mm
(
1/2 in
)
3/4-16
47 – 54 N·m
(
35 – 40 lb ft
)
34 – 41 N·m
(
25 – 30 lb ft
)
10
15.9 mm
(
5/8 in
)
7/8-14
72 – 79 N·m
(
53 – 58 lb ft
)
47 – 54 N·m
(
35 – 40 lb ft
)
12
19.1 mm
(
3/4 in
)
1-1/16-12
104 – 111 N·m
(
77 – 82 lb ft
)
81 – 95 N·m
(
60 – 70 lb ft
)
14
22.2 mm
(
7/8 in
)
1-3/16-12
122 – 136 N·m
(
90 – 100 lb ft
)
95 – 109 N·m
(
70 – 80 lb ft
)
16
25.4 mm
(
1 in
)
1-5/16-12
149 – 163 N·m
(
110 – 120 lb ft
)
108 – 122 N·m
(
80 – 90 lb ft
)
20
31.8 mm
(
1-1/4 in
)
1-5/8-12
190 – 204 N·m
(
140 – 150 lb ft
)
129 – 158 N·m
(
95 – 115 lb ft
)
24
38.1 mm
(
1-1/2 in
)
1-7/8-12
217 – 237 N·m
(
160 – 175 lb ft
)
163 – 190 N·m
(
120 – 140 lb ft
)
32
50.8 mm
(
2 in
)
2-1/2-12
305 – 325 N·m
(
225 – 240 lb ft
)
339 – 407 N·m
(
250 – 300 lb ft
)
These torques are not recommended for tubes of
12.7 mm
(
1/2 in
) OD and larger with wall thickness of
0.889 mm
(
0.035 in
) or less. The torque is specified for
0.889 mm
(
0.035 in
) wall tubes on each application individually.
Before installing and torquing
37°
flared fittings, clean the face of the flare and threads with a clean solvent or Loctite
cleaner and apply hydraulic sealant
L
OCTITE
® 569™
to the
37°
flare and the threads.
Install fitting and torque to specified torque, loosen fitting and retorque to specifications.
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