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Tightening torque (N・m) Uni thread size Wrench tightening angle after tightened by hand (deg) 3 to 5 8 to 12 14 to 16 20 to 22 1/8 1/4 3/8 1/2 30 to 60 30 to 60 15 to 45 15 to 30 3 to 4 4 to 5 8 to 9 14 to 15 1/8 1/4 3/8 1/2 30 to 45 15 to 30 15 to 30 15 to 30 Tightening torque (N・m) Uni thread size Wrench tightening angle after tightened by hand (deg) Connection Female Thread: Rc, NPT, NPTF Connection Female Thread: G Connection thread size 3.1 to 3.4 5.1 to 5.4 5.0 to 5.3 M3 M5 10-32UNF Chamfer dimension oD (Recommended value) Rc NPT, NPTF Connection thread size . 10.2 to 10.4 13.6 to 13.8 17.1 to 17.3 21.4 to 21.6 G. 10.2 to 10.6 13.6 to 14.0 17.1 to 17.5 21.4 to 21.8 1/16 1/8 1/4 3/8 1/2 8.2 to 8.4 10.5 to 10.7 14.1 to 14.3 17.4 to 17.6 21.7 to 21.9 oD 45° Chamfer dimension oD (Recommended value) (mm) 45° Rz 12.5 oD Fittings & Tubing Precautions 4 Be sure to read this before handling. Tightening the threaded portion of the connection thread 2) The gasket can be recycled up to 6 to 10 times. It can be replaced easily when it has sustained damage. A broken gasket can be removed by holding it and then turning it in the same direction as loosening the thread. If gasket is difficult to remove, cut it with nippers, etc. In such a case, use caution not to scratch the seat face because the seat face of 45° gasket of fitting is the sealing face. Caution Caution 1. Chamfer dimension for female thread of the connection thread M3, M5, 10-32UNF Confirming to ISO 16030 (air pressure fluid dynamics . connection . ports and stud ends), the chamfer dimensions shown below are recommended. By chamfering as shown in the following table, machining of threads is easier and effective for burr prevention. . For Uni thread, Rz 12.5 is necessary for sealing at the chamfered part. 2. Chamfer dimension of R and NPT thread with sealant, and Uni thread Chamfer Dimension for Female Thread Recommended No good Fig. 2 When using a tying band to bind the piping together Straight line Mounting pitch A Fig. 1 Recommended piping Recommended Piping Conditions 1. When connecting piping to the One-touch fitting, use pipe length with sufficient margin, in accordance with the piping conditions shown in Fig. 1. Also, when using a tying band, etc., to bind the piping together, make sure that external force does not come to bear on the fitting. (See Fig. 2.) Tubing size Mounting pitch A Unit: mm Nylon tubing Soft nylon tubing Polyurethane tubing . 44 or more 56 or more 67 or more 84 or more 89 or more 112 or more 140 or more 134 or more 168 or more 178 or more 224 or more . 35 or more 44 or more 52 or more 66 or more 70 or more 88 or more 110 or more 105 or more 132 or more 140 or more 176 or more 13 or more 25 or more 26 or more 38 or more 39 or more 57 or more 52 or more 69 or more 69 or more 88 or more 93 or more 114 or more Straight line length o2 o3.2, 1/8" o4, 5/32" o3/16" o6 o1/4" o8, 5/16" o10 o3/8" o12 o1/2" o16 10 or more 16 or more 20 or more 24 or more 30 or more 32 or more 40 or more 50 or more 48 or more 60 or more 64 or more 80 or more  Design/Selection Tubing 1. When using a tubing other than from SMC, be careful of the tolerance of the tubing O.D. and tubing material. 1) Nylon tubing Within ±0.1 mm 2) Soft nylon tubing Within ±0.1 mm 3) Polyurethane tubing Within +0.15 mm, Within .0.2 mm 2. When using fittings other than those from SMC, be certain to confirm that operating conditions are such that no problems will arise. Do not use the tubing which does not satisfy the specified tubing O.D. accuracy, or if the tubing has a different I.D., material, hardness, or surface roughness from those of SMC’s tubing. Please consult SMC if there is anything unclear. It may cause difficulty in connecting the tubing, leakage, disconnection of the tubing, or fitting damage. When used with tubing other than those from SMC, due to their properties, the products listed below are not subject to warranty. KQG2, KQB2, KFG2, KF, o2M 5. Uni Thread Fittings 1) First, tighten the threaded portion by hand, then use a proper wrench, which could be suitable for the width across flats of the hexagon body, to tighten it further at a wrench tightening angle shown below. As a reference value for the tightening torque, refer to the table below. 47