Drawn Over Mandrel Tubing

Drawn Over Mandrel (DOM) Round Mechanical Tubing is a cold drawn 1020/1026 electric resistance welded tube with all the flash removed prior to cold drawing. In comparison to other tubing, DOM round tubing is produced to more exact OD and ID tolerances, and has the highest weld strength possible.

Made from 1020 / 1026 Steel
Meets ASTM A513 Type 5

Stocked Size Range

  • 0.188” to 12.000” O.D. with 0.028” to 0.625” Wall Thickness
  • Stocked in 17.000’ - 24.000’ random lengths (cut to length available)

Manufacturing Process

The manufacturing process for DOM tubing begins with coils of steel, which are slit to the proper width for the desired tube size. The strip is cold formed and passed through an electric resistance welder which joins the edges together, under pressure, to complete the tubular shape. After testing the weld’s integrity, the tubing is cut to length for further processing. The cold-drawing process creates a uniform, precision product with substantially improved tolerances, surface finish and tensile strength, increased hardness and good machinability. In this process, the tube is cleaned and annealed, and one end of each length is squeezed to a point so it can be gripped by the drawing mechanism. The tube is then drawn through one or more dies and over mandrels. This reduces the diameter of the tube and thins its walls to the required dimensions in a controlled fashion to provide the qualities desired in the finished product. Metallurgically, drawing improves the tube’s concentricity, tensile strength, hardness and machinability. Close dimensional accuracy is achieved through tight control of both outside and inside diameters.

Benefits of Drawn Over Mandrel Tubing

Cost-Effectiveness

  • Close tolerances allow DOM to be used for mechanical parts with minimal or no downstream processing.

Strength

  • Cold-drawing gives DOM high yield and tensile strength.

Uniformity

  • DOM has uniform wall thickness and concentricity, as well as uniform mechanical properties. DOM tubing also has close OD and ID tolerances. Uniform grain structure and controlled hardness.

Appearance

  • Smooth and Clean OD and ID surfaces.

Close Tolerances

  • DOM offers exceptionally close tolerances for OD, ID and wall thickness dimensions.

Surface Quality

  • OD and ID surfaces of DOM are free of oxide and scale and have a smooth, dense finish with no trace of the weld.

Machinability

  • DOM is easily machined, with only a nominal stock allowance for clean-up. It has excellent machining characteristics.

Wide Range of Sizes

  • DOM can be manufactured to an almost infinite range of OD and wall thickness dimensions by varying the size of the dies and mandrels used.

Applications

Construction & Heavy Equipment

  • Augers
  • Chassis
  • Crane Boom Lacings
  • Cylinders
  • Handrails
  • Hydraulics
  • Shafts
  • Struts
  • Transmission Shafts

Agriculture

  • Hydraulic Cylinders
  • Machinery Frames
  • Augers
  • Booms
  • Chassis
  • Frame Steering Components
  • Hand Rails
  • Shafts
  • Spacers
  • Bushings

Infrastructure

  • Columns
  • Railings
  • Lift Components

Fluid Handling

  • Engine Assemblies
  • Pumps
  • Other Components Which Liquids Will Flow (Especially at High Speeds)

Machinery

  • Numerous Internal Machine Components
  • Pumps
  • Hydraulic Components
  • Frames
  • Industrial Lift Components
  • Tool Extensions

Oil & Gas

  • Pumps
  • Barrels
  • Plungers
  • Bearing Races 
  • Spacers

Energy

  • Solar Brackets
  • Waste Treatment
  • Wind Turbine Components
  • Nuclear, Wind, Solar, Gas, and Coal Plant Applications

General Fabrication and Machining

  • Size Specific Needs 
  • Supports
  • Telescoping Purposes
  • Paper, Textile & Steel Mill Rolls

Automotive & Transportation

  • Auto & Truck Axles
  • Auto Engine Assemblies
  • Roll Cages
  • Axles
  • Camshaft Tubes
  • Chassis
  • Dampeners
  • Gas Springs
  • Headers
  • Head Rests
  • Pillars
  • Seat Frames
  • Shafts (Drive, Half and Prop)
  • Shock Absorbers
  • Steering
  • Struts
Customized Cut Lengths Available. Specialize Cut Length During Quote Process.