When engineers say "copper coils" they usually mean seamless copper tube supplied in coiled form, annealed to a soft temper so it can be bent, flared and routed on site or on a production line. The term also covers flat copper strip supplied in coils for electrical and fabrication use. This guide explains the main coil formats, how a copper coils manufacturer in India produces them, and how to specify the right coil for refrigeration, air conditioning, heat-exchanger and plumbing work.
A copper coil is a continuous length of copper tube (or strip) wound into a compact, easy-to-ship package. Coiling lets suppliers deliver long, joint-free lengths, which reduces the number of brazed joints in a system and therefore the number of potential leak points. Soft copper coils are produced from C12200 (Cu-DHP) or C10200 (Cu-OF) tube, drawn to size and bright-annealed to the O60 (soft annealed) temper described in ASTM B280, ASTM B68 and ASTM B88.
| Coil type | Winding style | Typical length | Best for |
|---|---|---|---|
| Plain (straight-wound) coil | Free loops, tied and bundled | 15 m, 30 m, 50 ft and similar | Site installation, plumbing, LPG, refrigerant lines |
| Pancake coil | Flat spiral layers like a pancake | Short to medium lengths | ACR contractors, service and retrofit |
| Level wound coil (LWC) | Parallel layers on a spool or drum | Hundreds of metres | Automated HVAC coil and heat-exchanger production |
| Copper strip coil | Flat strip wound on a core | Per coil weight | Electrical, fabrication and stamping |
Hard drawn (H58) copper tube is rigid and ideal for straight runs, but it cannot be bent without fittings. Annealed (O60) tube has a lower yield strength and high elongation, so a refrigerant installer can bend it around obstacles with a spring or lever bender and make a flared or brazed connection without cutting and joining many short pieces. The trade-offs to remember are lower pressure rating for a given wall thickness and more care needed to avoid kinking at small bend radii.
Soft copper coils for ACR and plumbing commonly range from about 1/4 in (6.35 mm) up to 1-1/8 in (28.6 mm) OD, with wall thickness chosen for the working pressure and refrigerant. Larger OD tube is better supplied as straight hard-drawn lengths because it is difficult to coil. Dimensional tolerances for OD, wall and ovality are set by ASTM B280 and ASTM B88; custom sizes are available for OEM requirements.
Specification tip: state the refrigerant (for example R410A, R32 or R290), the design pressure, the OD and wall thickness, and whether the coil must be dehydrated and sealed. These four inputs drive the correct wall selection.
Reliable coil suppliers should provide a mill test certificate with chemical composition and temper, evidence of cleanliness for ACR grades, and consistent coil dimensions so that your decoiling and bending equipment runs without jams. Ask for the coil weight, inside and outside coil diameter and packing method in the quotation.
Melta Alloys manufactures and exports copper tubes in soft coil and straight-length forms from Umbergaon, Gujarat. With in-house spectrometer analysis, hardness testing and hydrostatic testing, plus custom lengths and sizes to ASTM, EN and BS standards, we supply HVAC OEMs, wholesalers and contractors in 20+ countries. See our copper pipes and tubes range or read the companion guide on copper tubes manufacturing.
A copper coil is simply copper tube supplied in a wound, annealed form. The tube itself follows the same standards (such as ASTM B280 or B88); coiling only changes the supply format and temper.
Choose soft annealed O60 when the tube must be bent on site or on automatic bending machines. Choose hard drawn H58 for straight runs that need higher stiffness and pressure capacity.
Yes. ACR copper coils can be supplied cleaned, dehydrated and sealed at both ends to keep moisture and dirt out of the refrigerant circuit.
MOQ depends on size and grade. Share your OD, wall thickness, quantity and destination, and our sales team will confirm availability and lead time.
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