1. Tightening of the M5-size connection threads 1) Tighten it by hand, then give it an additional 1/6 turn with a wrench. As a guideline, the tightening torque should be 1 to 1.5 N・m. 2) Over tightening can cause damage to the threads and/or air leakage due to deformation of the gasket. 3) Insufficient tightening can cause the threads to loosen and/or air to leak out. 2. Tightening of the fittings with a sealant 1) Tighten fittings with sealant using the proper tightening torques in the table below. As a rule, they should be tightened 2 to 3 turns with a tool after first tightening by hand. 2) When a fitting is over tightened, more of the sealant material is squeezed out. Remove the squeezed out sealant material. 3) When tightening is not sufficient, it will cause sealant failure or a loose fitting. 4) Re-using (1) Normally, a fitting with sealant can be re-used 2 to 3 times. (2) Remove the sealant material that is separated and adhering to a removed fitting with air blow, etc. If the separated sealant enters into nearby equipment, it will cause air leakage or malfunction. (3) When the sealant is no longer effective, wrap sealant tape over the sealant material and re-use the fitting. Do not use a sealant material other than sealant tape. 5) In cases where positioning is required, turning the fitting in the reverse direction after tightening will cause air leakage. 1. When using tubing brands other than SMC, confirm that the tubing outside diameter tolerances satisfy the following specifications. 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 When the tube O.D. accuracy is not satisfactory and measurement of the internal diameter dimensions does not match the dimensions provided by SMC, do not use. The tube may not connect, or leaks, tube disconnection, or damage to fittings may occur. Straight section Mounting pitch A Fig. 2 When using a unifying band to bind together the pipes Fig. 1 Recommended piping Recommended NG 1. When installing piping in the one-touch fitting, please make sure there is sufficient slack to the tube length as per the recommended piping conditions shown in Figure 1. Also, when binding pipes together with a unifying band, etc., make sure piping is carried out without receiving external force (See Fig. 2). Tubing size Mounting pitch A Unit: mm Nylon tube Soft nylon tube Polyurethane tube 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 29 or more 30 or more 38 or more 39 or more 56 or more 58 or more 70 or more 76 or more 82 or more 118 or more 144 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 section o3.2, 1/8" o4, 5/32" o3/16" o6 o1/4" o8, 5/16" o10 o3/8" o12 o1/2" o16 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 Handling of Barb Fittings and Nut Fittings Recommended piping conditions Caution 1. When using a nut fitting, insert the hose all the way to the end and securely tighten it with the nut. When the insertion of the hose or the tightening of the nut are not sufficient, the hose may slip out. 2. Disconnection may occur depending on the material or the O.D. accuracy of the hose; therefore be sure to confirm the applicability of the hose. Handling of Fittings Caution Connection thread size NPT, R 1/8 NPT, R 1/4 NPT, R 3/8 NPT, R 1/2 NPT, R 3/4 NPT, R 1 NPT, R 1 1/4 NPT, R 1 1/2 Proper tightening torque N・m 3 to 5 8 to 12 5 to 10 20 to 25 28 to 30 36 to 38 40 to 42 48 to 50 Precautions on Other Tubing Brands Caution S Couplers Specific Product Precautions 4 Be sure to read before handling. Refer to front matter 56 for Safety Instructions and pages 13 to 16 for Fittings and Tubing Precautions. A 184