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Fittings Specifications
TIGHTENING HYDRAULIC FITTINGS
Escaping fluid under pressure can penetrate the skin
causing serious injury. Relieve pressure before
disconnecting hydraulic or other lines. Tighten all
connections before applying pressure. Keep hands and
body away from pin holes and nozzles which eject
fluids under high pressure. Use a piece of cardboard or
paper to search for leaks. DO NOT use your hand.
Failure to comply may result in personal injury.
1.
Inspect O-ring and seat for dirt or obvious defects.
2.
On angle fittings, back the locknut off until washer
bottoms out at top of groove.
3.
Hand-tighten fitting until backup washer or washer
face (if straight fitting) bottoms on face and O-ring is
seated.
4.
Position angle fittings by unscrewing no more than
one turn.
5.
Tighten straight fittings to torque shown in O-ring Fit-
ting Torque Chart below.
Torque values shown in both torque charts below are based on
lubricated connections (such as for reassembly).
O-ring Fitting Torque Chart
Thread Size
Nut Size Across
Flats
Torque Value
Recommended Turns to Tighten
(after finger tightening)
in.
in.
N•m
ft-lb
Flats
Turns
3/8
1/2
8
6
2
1/3
7/16
9/16
12
9
2
1/3
1/2
5/8
16
12
2
1/3
9/16
11/16
24
18
2
1/3
3/4
7/8
46
34
2
1/3
7/8
1
62
46
1-1/2
1/4
1-1/16
1-1/4
102
75
1
1/6
1-3/16
1-3/8
122
90
1
1/6
1-5/16
1-1/2
142
105
3/4
1/8
1-5/8
1-7/8
190
140
3/4
1/8
1-7/8
2-1/8
217
160
1/2
1/12
