What is DOM Tubing Used For?

DOM tubing (Drawn Over Mandrel) is a high-quality, precision steel tube. Unlike standard welded tubing, it offers superior dimensional accuracy, a smooth interior and exterior finish, and excellent mechanical properties.

Typical Uses:

1. Automotive Industry

   • Drive shafts, steering columns, and shock absorber bodies.

   • Provides strength and uniformity for safety-critical parts.

2. Industrial Machinery

   • Hydraulic cylinders, machine components, and rollers.

   • The smooth ID is perfect for fluid power systems.

3. Recreational Equipment

   • Bicycles, race cars, and off-road vehicles.

   • Lightweight but strong, ensuring performance under stress.

4. Construction & Structural Applications

   • Frame structures, agricultural machinery, and conveyor systems.

   • Chosen when high load-bearing capacity and toughness are needed.

How is DOM Tubing Made?

The process begins with ERW (Electric Resistance Welded) tubing, then undergoes further refinement:

1. Starting Tube → An ERW tube is formed from strip steel and welded.

2. Cleaning & Annealing → Scales and oxides are removed, and the tube is heat-treated for uniformity.

3. Cold Drawing Over Mandrel → The tube is drawn through a die with a mandrel inside.

   • This reduces diameter, improves roundness, and enhances surface finish.

   • Wall thickness becomes more consistent.

4. Final Processing → Heat treating, cutting, or machining depending on application requirements.

This process removes weld seam irregularities and improves mechanical strength, resulting in tubing that performs like seamless steel tubing but at a more economical cost.

Is DOM Tubing Right For You?

Ask yourself three things:

1. Do you need tight tolerances and smooth finishes?

   • Yes → DOM is better than standard ERW.

   • Example: hydraulic cylinder barrels where seals rely on smooth inner walls.

2. Do you need high strength and reliability under pressure?

   • Yes → DOM offers better yield strength and impact resistance than regular welded tubing.

   • Example: automotive roll cages or steering shafts.

3. Is cost a concern compared to seamless tubing?

   • DOM provides performance close to seamless but at lower cost.

   • Ideal for customers who want a balance of strength, accuracy, and economy.

Conclusion:
DOM tubing is best suited for applications where strength, uniformity, and precision matter most. It fills the gap between standard welded tubing and expensive seamless tubing, making it an excellent choice for industries such as automotive, hydraulics, and machinery.