0-18
HIGH PRESSURE HOSE FITTING TIGHTENING TORQUE
1. When connecting a high pressure hose, wipe the hose fitting and corresponding nipple contact
surfaces with a clean cloth to remove foreign matter and dirt. Also check that there are no dents or
other damage on the contact surfaces before installation.
2. When installing a high-pressure hose, align the hose metal joint with the nipple and tighten the bolt so
as to maintain alignment.
3. The maximum tightening torque must not exceed twice the standard tightening torque.
Nominal diameter of
screw
Standard tightening torque N•m (kgf•cm) [ft•lbf]
Hose inside
diameter
mm (in)
Standard
Tightening range
7/16-20UNF
25 (250) [18.1]
24 to 26 (240 to 270) [17.4 to 19.5]
6 (0.24)
9/16-18UNF
49 (500) [36.2]
47 to 52 (480 to 530) [34.7 to 38.3]
9 (0.35)
3/4-16UNF
59 (600) [43.4]
56 to 62 (570 to 630) [41.2 to 45.6]
12 (0.47)
7/8-14UNF
59 (600) [43.4]
56 to 62 (570 to 630) [41.2 to 45.6]
12 (0.47),
15 (0.59)
1•1/16-12UNF
118 (1200) [86.8]
112 to 123 (1140 to 1250) [82.5 to 90.4]
19 (0.75)
1•5/16-12UNF
137 (1400) [101.3]
130 to 144 (1330 to 1470) [96.2 to 106.4]
25 (0.98)
PF1/4
25 (250) [18.1]
24 to 26 (240 to 270) [17.4 to 19.5]
6 (0.24)
PF3/8
49 (500) [36.2]
47 to 52 (480 to 530) [34.7 to 38.3]
9 (0.35)
PF1/2
59 (600) [43.4]
56 to 62 (570 to 630) [41.2 to 45.6]
12 (0.47)
PF3/4
118 (1200) [86.8]
112 to 123 (1140 to 1250) [82.5 to 90.4]
19 (0.75)
PF1
137 (1400) [101.3]
130 to 144 (1330 to 1470) [96.2 to 106.4]
25 (0.98)
