DOM (Drawn Over Mandrel) tubing is a cold-drawn, electric-resistance-welded (ERW) carbon steel tube processed over a mandrel to achieve exceptional surface smoothness, dimensional accuracy, and uniform wall thickness. Ideal for hydraulic cylinders, automotive components, and machinery, DOM tubing offers superior strength and reliability in critical applications .
Enhanced Dimensional Accuracy: DOM tubing maintains tight tolerances for diameter, wall thickness, and roundness, ensuring consistency in precision assemblies. The mandrel-controlled process guarantees uniformity unmatched by seamless alternatives .
Superior Mechanical Properties: Cold drawing work-hardens the steel, increasing yield and tensile strength. Stress relief annealing stabilizes the material, reducing risks of deformation under load .
Improved Weld Integrity: The ERW base tube is refined during drawing, resulting in a weld zone that matches the parent metal in strength and ductility. This eliminates internal reinforcement, enabling seamless machining .
Models: ASTM A513 Type 5 (standard DOM), Type 6 (special smooth ID) .
Material Types: Carbon steels (e.g., SAE 1020, 1026), alloy steels (e.g., SAE 4130); other grades available upon request.
Lengths: Standard lengths 1–16 meters; custom lengths up to 24 meters achievable.
Surface Roughness: ID roughness ≤ Ra 0.4 μm; OD roughness ≤ Ra 0.5 μm (can be polished to Ra 0.2 μm).
Chemical Composition: Low to medium carbon content (0.10–0.30% C), with chromium, manganese, and silicon variants for enhanced hardness and corrosion resistance.
Straightness: ≤0.2 mm per 1000 mm length.
Diameter Tolerance: OD ±0.1 mm; ID ±0.05 mm (ISO f7/f8 standards).
Roundness: ≤50% of diameter tolerance, ensuring concentricity for dynamic applications.
Wall Thickness Uniformity: ±5% deviation, critical for high-pressure hydraulic systems.
1. Uncompromising Quality Assurance
Our DOM tubing undergoes rigorous testing, including eddy current inspection, hydrostatic pressure checks, and ultrasonic weld scrutiny. We adhere to ASTM A513 standards, guaranteeing performance in extreme conditions .
2. Customization for Complex Requirements
We tailor tubing to client-specific needs, offering:
Custom diameters (6 mm to 300 mm) and wall thicknesses (0.5 mm to 20 mm).
Post-process treatments (e.g., honing, chrome plating) for enhanced wear resistance.
Material certifications and traceability for compliance-sensitive industries.
3. Industry-Proven Reliability
With DOM tubing widely used in hydraulic cylinders, automotive frames, and agricultural machinery, our products deliver longevity under stress, corrosion resistance, and minimal maintenance needs .
4. Global Supply Chain Efficiency
We support just-in-time delivery for international clients, backed by seamless logistics and technical support. Our production capacity accommodates prototypes to large-volume orders.
5. Sustainable Manufacturing
Our processes prioritize material efficiency (e.g., reduced scrap) and eco-friendly treatments, aligning with global environmental standards.
Hydraulic Systems: Cylinder barrels and piston rods for construction equipment.
Automotive: Shock absorber cylinders, steering components, and drive shafts.
Industrial Machinery: Precision guides, actuator housings, and bearing sleeves.
Agriculture: Loader arms, conveyor systems, and irrigation components.
Choose DOM tubing that combines precision, durability, and cost efficiency. Contact our team for material certifications, samples, or tailored solutions. Let us help you innovate with tubing that meets the highest industrial standards.
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