A complete copper tube RFQ should state the grade and standard, outer diameter, wall thickness, dimensional tolerances, temper or condition, straight or coil form, length, surface and end requirements, quantity, application, inspection documents and packing.
What should a buyer specify for copper tube?
Provide the material grade and standard, outer diameter, wall thickness, tolerance, temper or condition, straight length or coil dimensions, quantity and application. Add inner and outer surface requirements, end condition, cleanliness, testing or document requirements and export packing when they apply.
Copper tube RFQ checklist
| Field | Information to send | Review purpose |
|---|---|---|
| Grade / standard | Drawing designation or GB, ASTM, UNS, JIS, EN or another reference | Identifies chemistry, condition and applicable requirements. |
| Outer diameter | Nominal OD and permitted variation | Supports fitting, forming and assembly review. |
| Wall thickness | Nominal wall and tolerance | Affects weight, forming and application requirements. |
| Form / length | Straight tube length or coil ID, OD and coil weight | Defines delivery form and handling requirements. |
| Temper / condition | Soft, hard, annealed or a stated property requirement | Affects bending, flaring, forming and rigidity. |
| Surface / ends | Inner and outer surface, cleanliness, end cut, deburring or protection | Supports joining, fluid service and assembly review. |
| Quantity / use | Weight or length, recurring demand, application and processing | Provides production and specification context. |
| Tests / documents | Required inspection, test reference, MTC or COA and packing documents | Clarifies acceptance and delivery requirements. |
Grade and governing standard
State the exact designation and standard required by the drawing or application. C12200, C11000 and other copper designations may appear in tube inquiries, but a designation alone does not define every dimension, condition or test requirement. Cross-standard references should be treated as discussion aids, not automatic equivalence.
Outer diameter, wall thickness and tolerance
Tube size should normally include outer diameter and wall thickness rather than a general nominal name. State the permitted variation for both dimensions and identify whether ovality, straightness or concentricity is critical. If the tube must fit a connector, be expanded, bent or inserted into another component, include the mating dimension or drawing.
Straight tube or coil tube
For straight tube, provide cut length, length tolerance, end condition and bundle restrictions. For coil tube, provide coil inner diameter, preferred outer diameter, maximum coil weight and any winding requirement. Delivery form affects handling, processing and packing, so it should be decided before quotation.
Temper, bending and forming
Soft or annealed tube may be requested for bending or forming, while harder conditions may be relevant where rigidity is needed. The correct condition depends on the grade, standard and downstream process. Tell the supplier whether the tube will be bent, flared, expanded, machined, brazed, welded or otherwise formed.
Surface, cleanliness and tube ends
State requirements for the inner and outer surface, oxidation, scratches, residues and protective packaging. Applications involving fluid flow, joining or heat transfer may need specific cleanliness or end protection. End requirements can include square cut, deburring, caps or another drawing-defined condition.
Inspection, testing and documents
If dimensional inspection, a test method, MTC, COA or another report is required, identify the standard and acceptance criteria in the RFQ. Test availability, sampling and document format should be confirmed for the product and order before purchase.
Export packing information
For straight tube, discuss bundle size, wrapping, end protection and wooden case or pallet requirements. For coiled tube, specify coil support, moisture protection, maximum package weight, labels and shipping marks. The destination and transport method help define suitable packing.
Copper tube RFQ example
Product: Straight copper tube
Grade: State designation and standard
Size: OD 12 mm x wall 1 mm
Tolerance: State OD, wall and length limits
Condition: State temper or forming requirement
Length: State cut length and tolerance
Application: State HVAC, heat transfer or industrial use
Quantity: State weight or total length
Documents: State inspection and certificate needs
Packing: End protection and export wooden case
Frequently asked questions
Which dimensions are required for a copper tube quotation?
Provide outer diameter, wall thickness and their tolerances. Add straight length or coil dimensions, plus ovality, straightness, concentricity or end requirements when they are critical.
Should a copper tube RFQ state straight or coil form?
Yes. Straight and coiled tube use different length, handling and packing information. State the required delivery form before quotation.
Why should the tube application be provided?
The application and downstream process provide context for grade, condition, surface, cleanliness, end, testing and packing discussions. Final suitability remains subject to buyer confirmation.
Send the complete specification for review
Include the grade, dimensions, tolerance, condition, quantity, application, destination and packing or document requirements.
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