ASTM A254 defines the standard specifications for double walled steel tubing (copper brazed).
Engineered Industries Limited offers double walled ASTM A254 tubing with great quality, and very quick delivery.
We have plenty of stock of regular size tubing, and offer flexible packing and shipping options based on many year experience of ocean freight and airway cargo shipping.
Regular Size & Stock
Bundy tubes of the following table listed sizes are feasible to manufacture; among them, thickness of 0.7mm and 1mm are available in stock most of the time or to be produced upon being ordered.
| OD, mm | Wall Thickness, mm | ||||||
| 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1 | 1.3 | |
| Unit Weight (Theoretical), g/m | |||||||
| 3.18 | 33.0 | 38.2 | 42.8 | 47.0 | |||
| 4 | 43.2 | 50.3 | 57.0 | 63.1 | |||
| 4.76 | 52.5 | 61.6 | 70.1 | 78.1 | 85.7 | ||
| 5 | 55.5 | 65.1 | 74.2 | 82.9 | 91.0 | 98.6 | |
| 6 | 67.8 | 79.9 | 91.5 | 102.6 | 113.2 | 123.3 | |
| 6.35 | 72.1 | 85.1 | 97.5 | 109.5 | 121.0 | 131.9 | |
| 7 | 80.2 | 94.7 | 108.8 | 122.3 | 135.4 | 148.0 | 182.7 |
| 7.94 | 91.7 | 108.6 | 125.0 | 140.9 | 156.3 | 171.2 | 212.9 |
| 8 | 92.5 | 109.5 | 126.0 | 142.1 | 157.6 | 172.6 | 214.8 |
| 9.53 | 111.3 | 132.1 | 152.4 | 172.2 | 191.5 | 210.4 | 263.9 |
| 10 | 139.1 | 160.5 | 181.5 | 202.0 | 222.0 | 278.9 | |
| 12 | 168.7 | 185.1 | 221.0 | 246.4 | 271.3 | 343.0 | |
| 12.7 | 179.0 | 207.2 | 234.8 | 261.9 | 288.5 | 365.5 | |
| 14 | 229.6 | 260.4 | 290.8 | 320.6 | 407.2 | ||
| 15.88 | 260.7 | 295.9 | 330.7 | 365.0 | 464.9 | ||
| 16 | 264.1 | 299.9 | 335.2 | 369.9 | 471.3 | ||
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.
Click here to calculate the tube weight.
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 |
Material
The tubes are made from low carbon steel strips (grade BHG2) which is manufactured by Bao Steel Group. The chemical compositions are as following:
| Element | C | Si | Mn | P | S |
| Standard (max, %) | 0.06 | 0.03 | 0.3 | 0.03 | 0.03 |
Mechanical Properties
| Tensil Strength | 42000psi (290MPa) |
| Yield Strength | 26100psi (180MPa) |
| Elongation | ≥25% |
| Expansion | ≥20% |
Inside Surface Cleanliness:0.16g/m2, max
Burst Pressure
| OD, mm | Wall Thickness, mm | ||||||
| 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1 | 1.3 | |
| Burst Pressure, MPa | |||||||
| 3.18 | 119.4 | 148.8 | 180.6 | 215.1 | |||
| 4 | 91.4 | 112.9 | 135.8 | 160.0 | |||
| 4.76 | 75.1 | 92.3 | 110.3 | 129.3 | 148.2 | ||
| 5 | 71.1 | 87.3 | 104.2 | 121.9 | 140.5 | 160.0 | |
| 6 | 58.2 | 71.1 | 84.5 | 98.5 | 112.9 | 128 | |
| 6.35 | 54.7 | 66.8 | 79.3 | 92.3 | 105.7 | 119.6 | |
| 7 | 49.2 | 60.0 | 71.1 | 82.6 | 94.4 | 106.7 | 146.0 |
| 7.94 | 43.0 | 52.3 | 61.9 | 71.7 | 81.8 | 92.2 | 125.3 |
| 8 | 42.7 | 51.9 | 61.4 | 71.1 | 81.1 | 91.4 | 124.2 |
| 9.53 | 35.4 | 43.0 | 50.7 | 58.6 | 66.7 | 75.0 | 101.1 |
| 10 | 40.9 | 48.2 | 55.7 | 63.3 | 71.1 | 95.6 | |
| 12 | 33.7 | 39.6 | 45.7 | 51.9 | 58.2 | 77.8 | |
| 12.7 | 31.7 | 37.3 | 43.0 | 48.8 | 54.7 | 73.0 | |
| 14 | 33.7 | 38.8 | 44.0 | 49.2 | 65.5 | ||
| 15.88 | 29.5 | 34 | 38.5 | 43 | 57.1 | ||
| 16 | 29.3 | 33.7 | 38.1 | 42.7 | 56.6 | ||
