ASTM A513 Type 5 DOM Mechanical Tubing: Drawn Over Mandrel
ASTM A513 · Published: 2026-06-01 · Updated: 2026-06-02
ASTM A513 Type 5 DOM (Drawn Over Mandrel) tubing starts as electric-resistance-welded (ERW) tube that is then cold-drawn over a mandrel and through a die. This process cold-works the material, improves dimensional tolerances (±0.13 mm on OD,...
ASTM A513 Type 5 DOM (Drawn Over Mandrel) tubing starts as electric-resistance-welded (ERW) tube that is then cold-drawn over a mandrel and through a die. This process cold-works the material, improves dimensional tolerances (±0.13 mm on OD, ±0.25 mm on wall), refines the weld zone to near-seamless appearance, and increases yield strength by 50-100% over the as-welded condition. DOM tubing is the preferred material for hydraulic cylinder barrels, automotive steering columns, drive shafts, and precision mechanical components requiring consistent wall thickness and smooth ID/OD surfaces. Available in 1020/1026 carbon steel grades.
Quick Facts
| Category | Carbon Steel |
| Standard | ASTM A513 |
| Density | 7.85 g/cm³ |
| Yield Strength | 483 MPa (70 ksi) typical |
| Tensile Strength | 552 MPa (80 ksi) typical |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
What is the difference between DOM and HREW tubing?
HREW (Hot-Rolled Electric-Welded) is the as-welded product—lower cost, less dimensional accuracy, visible weld seam. DOM starts as HREW and is cold-drawn over a mandrel, improving tolerances by 10×, increasing strength through cold work, and making the weld zone nearly invisible. DOM costs 30-60% more but is essential for hydraulic cylinders and precision mechanical applications.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu