GENERAL INFORMATION / Tightening
W1-2-6
PIPING JOINT
Pipe Thread Connection / Union Joint Tightening
Torque Specifications
Union Joint
Metal sealing faces (4) of adapter (1) and (5) of hose
(2) fit together to seal pressure oil. Union joints are
used to join small-diameter lines.
IMPORTANT: (1) Do not over-tighten nut (3). If ex-
cessive force is applied to metal
sealing faces (4) and (5), adaptor
(1) will be cracked. Always
tighten nut (3) to specifications.
(2) Scratches or other damage to
sealing faces (4) or (5) will cause
oil to leak at the joint. Take care
not to damage the sealing faces
when connecting or
disconnecting the union joint.
M202-07-051
W105-01-01-017
Wrench Size (mm)
Tightening Torque
Union Joint
Union Nut
Joint Body
N
⋅
m (kgf
⋅
m)
lbf
⋅
ft
30
°
Male
19
22
27
36
41
50
60
70
19
22
27
36
41
50
60
70
59 (6)
98 (10)
118 (12)
235 (24)
295 (30)
490 (50)
670 (68)
980 (100)
43
72
87
134
215
360
490
720
37
°
Female
19
22
27
36
41
50
17
19
22
30, 32
36
46
44 (4.5)
59 (6)
118 (12)
235 (24)
295 (30)
490 (50)
32.5
43
87
134
125
360
NOTE: 37
°
male union joint tightening torque val-
ues are equal to those for 37
°
female union
joint.
1
4
3
5
2
Female Joint
30
°
or 37
°
30
°
or 37
°
Male Joint
Joint Body
