4-23
4.10
TIGHTENING TORQUES FOR JOINTS & HYDRAULIC
HOSES
These tightening torques are available in the case of tightening without lubricant.
ORS FITTING (O-RING SEAL TYPE)
Hose Mouth and Fitting
Size
Wrench
(mm)
Tightening torque
N
･･
m {lbt
･･
ft}
1 to 14 UNS
30
137 ± 14 {101 ± 10}
32
1 to 3/16 to 12 UN
36
177 ± 18 {130 ± 13}
41
206 ± 21 {152 ± 15}
1 to 7/16 to 12 UN
41
206 ± 21 {152 ± 15}
46
BYTE TYPE TUBE FITTING
Tube size
O.D. x Thickness (mm)
Wrench
(mm)
Tightening torque
N
･･
m {lbt
･･
ft}
10 * 1.5
19
49 ± 9.8 {36 ± 7}
15 * 2.0
27
118 ± 12 {87 ± 9}
18 * 2.5
32
147 ± 15 {108 ± 18}
22 * 3.0
36
216 ± 22 {159 ± 16}
28 * 4.0
41
275 ± 27 {202 ± 20}
35 * 5.0
55
441 ± 44 {325 ± 33}
O-RING FITTING
Screw diameter
(PF)
Wrench
(mm)
Tightening torque
N
･･
m {lbt
･･
ft}
1/8
14
17 ± 2 {12.5 ± 1.5}
1/4
19
36 ± 2 {27 ± 1.5}
3/8
22
74 ± 5 {54 ± 4}
1/2
27
108 ± 9.8 {80 ± 7}
3/4
36
162 ± 9.8 {119 ± 7}
1
41
255 ± 9.8 {188 ± 7}
1 to 1/4
50
392 ± 40 {289 ± 30}
1 to 1/2
55
485 ± 49 {358 ± 36}
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