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China Ningbo Jintian Copper Tube Co.,Ltd. is a wholly owned sub-company of Jintian Group, it is specialized in HVACR copper tubes, environmental protection copper water tubes and copper fittings.The main products are: LWC, Pancake Coils, ACR Straight Tubes, Capillary Tubes, Copper Water Tubes, Copper Fittings, insulated Copper Tubes and Plasic-coated Copper Tubes. Being of the top-class quality the products, Jintian Copper have been appraised as Name Brand Product of Ningbo City and Zhejing Province. We have passed ISO9001, ISO14001, UPC,SGS and TUV etc.,these promise that the products we produced are always of the best quality 1) Alloy no.: C12200, Temper: soft drawn 2) Coil Wt.: 100kg 500 kg SpecificationsUnit weightO.DI.DBottom Wall Thickness TWFin Groove Depth HFTotalWallThicknessApex AngleHelix AngleNumber of ToothΦ5.00×0.20+0.15-18°335.004.300.20.150.35401840Φ7.00×0.25+0.10-15°527.006.300.250.100.35401565Φ7.00×0.25+0.18-18°577.006.140.250.180.43401850Φ7.00×0.25+0.22-16°587.006.060.250.220.47221654Φ7.00×0.27+0.15-18°607.006.160.270.150.42531860Φ7.94×0.25+0.18-18°657.947.080.250.180.43401850Φ7.94×0.25+0.20-18°667.947.040.250.200.45401850Φ7.94×0.26+0.17-18°667.947.080.260.170.43401850Φ7.94×0.28+0.20-18°727.946.980.280.200.48401850Φ7.94×0.30+0.20-18°767.946.940.30.200.50401850Φ9.52×0.27+0.16-18°829.528.660.270.160.43301870Φ9.52×0.28+0.12-15°809.528.720.280.120.40531565Φ9.52×0.28+0.15-18°839.528.660.280.150.43531860Φ9.52×0.28+0.15-25°889.528.660.280.150.43902565Φ9.52×0.28+0.20-18°859.528.560.280.200.48251855Φ9.52×0.28+0.20-18°889.528.560.280.200.48401860Φ9.52×0.30+0.20-18°909.528.520.30.200.50301860Φ9.52×0.30+0.20-18°949.528.520.30.200.50531860Φ9.52×0.34+0.15-25°1049.528.540.340.150.49902565Φ9.52×0.40+0.25-18°1239.528.220.40.250.65401860Φ12.00×0.36+0.25-18°14012.0010.780.360.250.61401870Φ12.70×0.35+0.25-18°15512.7011.500.350.250.60531870Φ12.70×0.40+0.25-18°17012.7011.400.40.250.65531870Φ12.70×0.50+0.25-18°20112.7011.200.50.250.75531875Φ12.75×0.36+0.21/0.25-20°15012.7511.530.360.250.61482070Remark:These are common sizes which the company is making,and unusaal sizes with special requirement can be tailor-made against order. the inside surface area increases 70 100% than that of the same specification of plain copper tube, the heat transfer coefficient is about 1.8 2.0 times of that of same specification of plain tube.