TORICH INTERNATIONAL LIMITED
| Payment Terms | L/C,D/A,D/P,T/T,Western Union, |
| Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-30days upon products |
| Packaging Details | In bundles or in wooden boxes. |
| Application | Automobile |
| Outer diameter(round) | 30 - 325 mm,50 - 250 mm,17 - 660 mm,1 - 1500 mm,5 - 120 mm |
| Thickness | 2 - 50 mm,0.1mm-60mm,0.3-3.5mm,1 - 8 mm,0.5 - 20 mm |
| Technique | Cold Drawn,Hot Rolled,Cold Rolled,ERW,Hot Rolled/Cold Drawn |
| Surface treatment | Galvanized,customerized,Copper Coated,Null,polished |
| Grade | SAE 1010 SAE 1008 E195 (1.0034) STKM11A Q215 |
| Section shape | Round,Rectangular |
| Length | 6M or as requirement,As customer's require,8m,5.8m,2.5-8m |
| Brand Name | TORICH |
| Model Number | Bundy Tube |
| Certification | ISO9001 ISO 14001 TS16949 |
| Place of Origin | Zhejiang/China |
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Product Specification
| Payment Terms | L/C,D/A,D/P,T/T,Western Union, | Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-30days upon products | Packaging Details | In bundles or in wooden boxes. |
| Application | Automobile | Outer diameter(round) | 30 - 325 mm,50 - 250 mm,17 - 660 mm,1 - 1500 mm,5 - 120 mm |
| Thickness | 2 - 50 mm,0.1mm-60mm,0.3-3.5mm,1 - 8 mm,0.5 - 20 mm | Technique | Cold Drawn,Hot Rolled,Cold Rolled,ERW,Hot Rolled/Cold Drawn |
| Surface treatment | Galvanized,customerized,Copper Coated,Null,polished | Grade | SAE 1010 SAE 1008 E195 (1.0034) STKM11A Q215 |
| Section shape | Round,Rectangular | Length | 6M or as requirement,As customer's require,8m,5.8m,2.5-8m |
| Brand Name | TORICH | Model Number | Bundy Tube |
| Certification | ISO9001 ISO 14001 TS16949 | Place of Origin | Zhejiang/China |
| High Light | Copper Plated Bundy Tube ，Low Carbon Steel Double-Wall Steel Tube ，Automotive Use Precision Steel Tube | ||
Bundy tube is a double-wall low-carbon steel tube manufactured by rolling a steel strip into a 720° overlap and copper-brazing the seam. This produces a concentric double-wall tube with a continuous brazed bond between the two walls.
For automotive brake and fuel lines, this design offers:
The mechanical strength and rigidity of steel
The corrosion protection and brazeability of a copper layer
Redundant double-wall pressure containment for safety
Your product, Bundy Tube Double-Wall Low Carbon Steel Tube Surface Copper Plating For Automobile, is designed specifically for automotive hydraulic and fuel systems.
Base metal
Low-carbon steel strip (e.g. AISI 1008 / 1010, EN E195, JIS STKM11A, GB Q215 equivalents)
Construction
Double-wall, copper-brazed along a 720° overlap seam
Outside diameter (OD)
Common automotive sizes: 4.76 mm, 6.35 mm, 8.0 mm
General capability range: approx. 3.17–15 mm
Wall thickness
Single wall: typically 0.5–0.7 mm
Effective total wall (double-wall): about 2 × single-wall thickness
Surface finishes (our selectable options)
Copper plating
Zinc plating
Color zinc plating (yellow chromate–treated zinc)
Supply condition
Annealed / normalized after brazing
Straight lengths (e.g. 6 m) or level-wound coils
Optional additional coatings
PVF, PA (nylon), PVC, or epoxy over metallic plating if higher corrosion resistance is required
High Pressure and Fatigue Safety Margin
Double-wall brazed construction gives high burst strength and excellent vibration fatigue resistance, ideal for brake and fuel lines.
Mechanical properties can be aligned with SAE J527-type requirements for yield, tensile strength, and elongation.
Flexible Surface Protection Options
We can supply tubes with copper-plated, zinc-plated, or color-zinc-plated (yellow chromate) surfaces to match different OEM corrosion requirements and cost levels.
Multi-layer systems (metallic plating plus organic coating) can be engineered for harsh road-salt and stone-chip environments.
Excellent Formability and Workability
Low-carbon, annealed steel provides good ductility for tight bending, double flaring, beading, and other end forming operations.
Suitable for complex routing along the vehicle chassis and through the engine compartment without cracking when correct tooling is used.
Dimensional Precision and Internal Cleanliness
Cold-drawn precision tube with tight tolerances on OD, wall thickness, and ovality.
Clean internal surface, helping to protect sensitive brake and fuel system components from contamination.
Reliable Joining Performance
Copper-bearing system supports consistent brazing quality and strong joints at fittings and brackets.
Compatible with common automotive connection types such as double flares, ISO flares, and appropriate compression or quick-connect fittings.
| Grade | Standard | C (wt.%) | Si (wt.%) | Mn (wt.%) | P max (wt.%) | S max (wt.%) | Comment |
|---|---|---|---|---|---|---|---|
| SAE / AISI 1010 | SAE J403 / AISI | 0.08–0.13 | — | 0.30–0.60 | 0.04 | 0.05 | Frequently used for Bundy strip |
| SAE / AISI 1008 | SAE J403 / AISI | ≤0.10 | ≤0.07–0.10 | 0.30–0.50 | 0.03 | 0.05 | Very low carbon, excellent formability |
| E195 (1.0034) | EN 10305-2 | ≤0.15 | ≤0.35 | ≤0.70 | 0.025–0.045 | 0.025–0.045 | Non-alloy quality steel for precision welded tubes |
| STKM11A | JIS G3445 | ≤0.12 | ≤0.35 | ≤0.60 | ≤0.04 | ≤0.04 | Carbon steel tube grade for machinery and automobiles |
| Q215 | GB/T 700 / GB/T 3524 | 0.09–0.15 | ≤0.30 | 0.25–0.55 | ≤0.045 | ≤0.050 | Chinese structural steel equivalent to E195 / St2ps |
| Grade | Condition (typical) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A (%) | Notes |
|---|---|---|---|---|---|
| SAE 1010 | Annealed | ≈154 | ≈231 | ≈56 | Very ductile, good for deep forming |
| SAE 1008 | Cold-worked range | ~350–550 | ~650–880 | ~8–25 | Represents higher-strength cold-worked products; tube can be specified softer if needed |
| E195 (1.0034) | Normalized (+N) | ≥195 | 300–440 | ≥28 | Typical for EN 10305-2 precision tubes |
| STKM11A | As specified for tubes | — | ≥290 | ≥35 | JIS G3445 minimum values for tubes |
| Q215 | Hot-rolled strip/plate | ≥215 | 335–450 | ≥31 | GB/T 700 / GB/T 3524 values for structural steel |
We can manufacture and qualify Bundy tube in accordance with the main international frameworks, including:
SAE / ASTM
SAE J527 – Brazed double-wall low-carbon steel tubing for automotive use
ASTM A254 – Copper-brazed double-wall steel tubing
EN / EU
EN 10305-2 – Welded cold-drawn precision steel tubes (E195 and related grades)
JIS (Japan)
JIS G3445 – Carbon steel tubes for machine structural purposes (STKM11A)
GB (China)
GB/T 700, GB/T 3524 – Carbon structural steels and strip (including Q215 for Bundy strip and tube)
Double-wall copper- or zinc-plated Bundy tube is used in:
Automotive hydraulic and fuel systems
Refrigeration and air-conditioning units
General fluid and gas control lines in machinery and appliances
Hydraulic brake lines (chassis lines, cross-axle lines)
Fuel feed and return lines (gasoline and diesel)
Transmission oil cooler and power steering lines (where applicable)
Auxiliary oil and coolant circuits where steel tubes are specified
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
1997
Total Annual:
25000000-30000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Company Overview A Professional Steel Tube Manufacturer and Solution Provider TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat... Company Overview A Professional Steel Tube Manufacturer and Solution Provider TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat...
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