Smooth Copper Tubes & Coils for AC | High Precision Copper Tubes

Smooth copper tubes and coils are the most widely used copper tube forms in the air conditioning and refrigeration industry. Featuring a smooth surface and uniform wall thickness, they are ideal for cost-effective AC heat exchangers and various connecting piping applications.

Manufactured using advanced continuous casting and rolling processes, Kenergy's smooth tubes offer clean inner and outer surfaces with no oxidation. Internal wall residue is strictly controlled within industry standards. Coil products are packaged in large-diameter coils, with single-coil lengths up to hundreds of meters, enabling continuous production and automated feeding while reducing material changeover time and improving production efficiency.

Core Advantages

High-Precision Wall Thickness Control

Wall thickness tolerance is controlled within ±0.02mm, ensuring consistent tube dimensions after expansion for reliable heat exchanger assembly.

Superior Internal Surface Cleanliness

Specialized cleaning processes keep internal wall residue at ≤0.02 g/m², preventing capillary tube blockages and ensuring system reliability.

Large-Coil Packaging

Single coil lengths from 500 to 2,000 meters available, reducing coil changeovers and significantly improving production line efficiency.

Annealed Soft / Half-Hard Temper Options

Available in soft (O) and half-hard (H55) tempers to match your tube expansion process requirements and application needs.

Technical Parameters

Standard outer diameters, wall thicknesses, and available specifications. Custom sizes available upon request.

Outer Diameter (mm)	Wall Thickness (mm)	Temper	Packaging Form	Coil Length (m)	Material
Φ4	0.25–0.50	O, H55	Coil / Straight	500 / 1000 / 1500 / 2000	TP2, T2, TU1
Φ6	0.25–0.60	O, H55	Coil / Straight	500 / 1000 / 1500 / 2000	TP2, T2, TU1
Φ7	0.25–0.70	O, H55	Coil / Straight	500 / 1000 / 1500 / 2000	TP2, T2, TU1
Φ7.94	0.25–0.80	O, H55	Coil / Straight	500 / 1000 / 1500	TP2, T2, TU1
Φ9.52	0.30–0.90	O, H55	Coil / Straight	500 / 1000	TP2, T2, TU1
Φ12.7	0.35–1.00	O, H55	Straight	—	TP2, T2, TU1
Φ15.88	0.40–1.00	O, H55	Straight	—	TP2, T2, TU1

Typical Applications

Window & Portable AC Heat Exchangers

Cost-effective condensers and evaporators for window units, mobile air conditioners, and dehumidifiers.

Indoor/Outdoor Unit Connecting Pipes

Connection lines between indoor and outdoor units for split-type air conditioning systems.

Refrigeration System Fittings

Piping components such as check valves, four-way reversing valves, and accumulator connecting tubes.

Instrumentation & Capillary Tubes

Precision small-diameter tubes for pressure instruments, sensing lines, and capillary restrictors.

Frequently Asked Questions

Q: What is the cost difference between smooth tubes and inner grooved tubes?

Smooth tubes typically cost 10-20% less than inner grooved tubes of the same diameter and wall thickness. For applications where heat transfer requirements are moderate, smooth tubes offer a more economical solution without compromising system performance. For high-efficiency applications, we recommend evaluating the overall system cost-benefit, as inner grooved tubes can reduce heat exchanger size and material usage.

Q: How is coil packaging protected against deformation during transport?

Our coil products are wound on sturdy steel spools with appropriate tension control to maintain coil integrity. Each coil is secured with multiple circumferential straps and wrapped with moisture-resistant polyethylene film and woven fabric. The spools are designed to support the coil weight and prevent deformation during handling and shipping. For large coils, we use wooden frames or pallets for additional protection.

Q: What is your residual carbon control standard for smooth tubes?

Our internal wall residual carbon content is controlled at ≤0.02 g/m², which is well within the industry-standard requirements for AC applications. This low residue level prevents capillary tube blockages and ensures long-term system reliability. For applications requiring even stricter control, we offer enhanced cleaning processes that achieve ≤0.01 g/m² upon request.

Q: Can you manufacture non-standard outer diameters?

Yes, we offer custom non-standard outer diameters to meet specific application requirements. Custom sizes may require dedicated tooling and are subject to minimum order quantities. Please provide your desired diameter, wall thickness, and tolerance requirements to our engineering team, and we will evaluate feasibility and provide a quotation. Typical lead time for custom sizes is 3-4 weeks.

AC Smooth Copper Tubes & Coils — High Precision Copper Tubes