GENERAL / Tightening PIPING JOINT IMPORTANT: The torque given in table below are for general use only, however, a different torque is given for a specific application. Use the specified torque. Union Joint Metal sealing surfaces (4) and (5) of adapter (1) and hose (2) fit together to seal pressure oil. Union joints are used to join small-diameter lines. IMPORTANT: Do not over-tighten union nut (3). Excessive force will be applied to metal sealing surfaces (4) and (5), possibly cracking the adapter (1). Tighten union nut (3) to the specifications. Scratches or other damage to sealing surfaces (4) or (5) will cause oil leakage at the joint.
Take care not to damage them when connecting / disconnecting. M202-07-051 a - Joint Body a 37 ° 30 ° c b W105-01-01-017 b - Male Union Joint c - Female Union Joint to tightening torque of 37 ° female. W1-2-4 1 4 3 5 2 Description Wrench Size mm Wrench Size mm Tightening Torque Union Nut Hose Fittings N⋅m (kgf⋅m, lbf⋅ft) 30°male 17 19 22 27 32 36 41 17 19 22 27 32 36 41 25 (2.5, 19) 30 (3.0, 22) 40 (4.0, 30) 80 (8.0, 59) 140 (14, 100) 180 (18, 130) 210 (21, 155) 37°female 17 19 22 27 32 36 41 14 17 19 22 27 32 36 25 (2.5, 19) 30 (3.0, 22) 40 (4.0, 30) 80 (8.0, 59) 140 (14, 100) 180 (18, 130) 210 (21, 155) NOTE: Tightening torque of 37°male coupling without union is similar