Yuhong Group Co.,Ltd
| Payment Terms | L/C,T/T |
| Delivery Time | 7 DAYS |
| Packaging Details | Wooden case, Woven bag |
| Product Name | Bundy Tube |
| Standard | ASTM A254, ASME SA254 |
| Material | BHG2 |
| Thickness | 0.02 inch to 0.04 inch |
| O.D. | 0.187 inch to 0.5 inch |
| Surface | Copper Coated |
| Process | Cold rolling |
| Type | ERW |
| End | Plain Ends / Beveled Ends |
| Application | Vehicle parts, Refrigerator, Brake lines, Fuel lines, Automatic gearbox return lines, etc |
| High Light | ASTM A254 BHG2 Bundy Tube, Copper-Brazed Steel Tubing |
| Brand Name | YUHONG |
| Model Number | ASTM A254 BHG2 Bundy Tube |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C,T/T | Delivery Time | 7 DAYS |
| Packaging Details | Wooden case, Woven bag | Product Name | Bundy Tube |
| Standard | ASTM A254, ASME SA254 | Material | BHG2 |
| Thickness | 0.02 inch to 0.04 inch | O.D. | 0.187 inch to 0.5 inch |
| Surface | Copper Coated | Process | Cold rolling |
| Type | ERW | End | Plain Ends / Beveled Ends |
| Application | Vehicle parts, Refrigerator, Brake lines, Fuel lines, Automatic gearbox return lines, etc | High Light | ASTM A254 BHG2 Bundy Tube, Copper-Brazed Steel Tubing |
| Brand Name | YUHONG | Model Number | ASTM A254 BHG2 Bundy Tube |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 | Place of Origin | CHINA |
| High Light | ASTM A254 BHG2 Bundy tube ，copper-brazed steel instrumentation tubing ，copper alloy Bundy tube | ||
ASTM A254 Copper-Brazed Steel Tubing BHG2 Bundy Tube
A Bundy tube is not just any steel tube; it's defined by its unique manufacturing process, which gives it exceptional properties. Its unique double-wall, copper-brazed construction gives it an unparalleled combination of strength, fatigue resistance, and leak-proof integrity, making it the undisputed first choice for the most critical hydraulic and fuel lines in vehicles.
Strip Preparation: A low-carbon steel strip (typically ASTM A254 Grade 2) is first coated with a layer of copper.
Double Rolling: This copper-coated strip is then passed through a series of rolls that form it into a seamless-looking, double-walled tube. The strip is rolled twice around its own longitudinal axis, creating a tight, overlapping seam.
Copper Brazing: The tube is then passed through a continuous furnace with a controlled atmosphere (a hydrogen-nitrogen mix). The heat melts the copper coating at the seam, which acts as a brazing filler metal. Capillary action draws the molten copper into the entire length of the seam, creating a strong, uniform, and leak-proof metallurgical bond.
Sizing and Cutting: The brazed tube is then cooled, drawn through dies to achieve precise final dimensions (OD, wall thickness), and cut to length.
Dimensional Accuracy
| OD | Tolerance | Wall Thickness | Tolerance |
| <4.76 | ±0.05 | 0.5 | ±0.07 |
| 4.76-8 | ±0.08 | 0.5-0.7 | ±0.08 |
| 8-12.7 | ±0.10 | 0.7-1 | ±0.09 |
| >12.7 | ±0.12 | 1-1.3 | ±0.1 |
*Custom Sizes: We are capable of fabricating Bundy tube sizes which are not regularly used. By combining one or more processes of cold draw and annealing, Bundy tubes can be made to many other sizes to meet demands for special applications.
General Size and Tolerance
| Outer diameter(φ) | Diameter tolerance (mm) | Wall thickness(mm) | Wall thickness tolerance(mm) | Pressure resistance(MPa) | Burst pressure (MPa) |
| 4.76(3/16″) | ±0.05 | 0.7 | +0.05/-0.08 | 41.2 | 110 |
| 6 | ±0.08 | ±0.08 | 32.7 | 85 | |
| 6.35(1/4″) | ±0.08 | ±0.08 | 30.9 | 78 | |
| 8(5/16″) | ±0.1 | ±0.08 | 24.5 | 67.5 | |
| 9.52(3/8″) | ±0.1 | ±0.08 | 20.6 | 57 | |
| 10 | ±0.1 | ±0.08 | 19.6 | 55 | |
| 12 | ±0.1 | ±0.08 | 16.3 | 32 | |
| 10 | ±0.1 | 1 | ±0.08 | 28 | 65 |
| 12 | ±0.1 | ±0.08 | 23.3 | 56 |
Comparison with Alternative Tubing
| Feature | ASTM A254 BHG2 Bundy Tube | SAE J525 Single-Wall Steel Tubing | Nylon / Plastic Tubing |
|---|---|---|---|
| Construction | Double-wall, copper-brazed | Single-wall, welded or seamless | Single-wall, extruded |
| Strength | Very High for its wall thickness | Good, but requires thicker walls for same pressure | Low to Moderate |
| Weight | Low | Higher (for equivalent strength) | Very Low |
| Fatigue Resistance | Excellent | Good | Can be susceptible to cracking |
| Leak Proofness | Excellent (metallurgical bond) | Good (potential for weld defects) | Good (if no damage) |
| Primary Use | Critical Safety Systems (Brakes, Fuel) | Less critical fluid lines (e.g., vent lines) |
Applications
1. Automotive & Transportation (Largest Application)
2. Refrigeration & Air Conditioning
3. Heat Exchangers
4. Aerospace & Aviation
5. Industrial Applications
6. Hydraulic Control Systems
7. Instrumentation Tubing
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9... YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...
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