TABLE OF STANDARD TIGHTENING TORQUES 00-16 Tightening torque for flare nut for general purpose Unit: N·m (kgf·m) [lbf·ft] Pipe diameter φ4.76 mm (φ0.187 in.) φ6.35 mm (φ0.250 in.) φ8 mm (φ0.315 in.) φ10 mm (φ0.394 in.) φ12 mm (φ0.472 in.) φ15 mm (φ0.591 in.) Tightening torque 17 (1.7) [12.5] 25 (2.6) [18.4] 39 (4.0) [28.8] 59 (6.0) [43.5] 88 (9.0) [64.9] 98 (10.0) [72.3] Tightening torque for air piping nylon tube for general purpose {DIN type} Unit:
N·m (kgf·m) [lbf·ft] Standard diameter 6 × 1 mm (0.236 × 0.0394 in.) 10 × 1.25 mm (0.394 × 0.0492 in.) 12 × 1.5 mm (0.472 × 0.0591 in.) 15 × 1.5 mm (0.591 × 0.0591 in.) Tightening torque +5.9 20 −0 +0.6 2.0 −0 +0.4 14.8 −0 +9.8 29 −0 +1.0 3.0 −0 +0.7 21.4 −0 +9.8 49 −0 +1.0 5.0 −0 +0.7 36.1 −0 +4.9 54 −0 +1.0 5.5 −0 +0.7 39.8 −0 Tightening torque for air piping nylon tube for general purpose {SAE type} Unit: N·m (kgf·m) [lbf·ft] Standard diameter 1/4 in. 3/8 in. 1/2 in. 5/8 in. Tightening torque +3.9 13 −0 +0.4 1.3 −0 +0.30 9.59 −0 +4.9 29 −0 +0.5 3.0 −0 +0.4 21.4 −0 +4.9 49 −0 +0.5 5.0 −0 +0.4 36.1 −0 +4.9 64 −0 +0.5 6.5 −0 +0.4 47.2 −0