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)