“the air table is working flawlessly” (at the South Pole!)
Marc Smiciklas
Post Doctoral Research Associate
Princeton University

HDRT550 (22″ Ø)

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Heavy Duty Rotary Motion Air Bearing Table

(Max Part Swing: 40” dia., Max Part & Fixture Weight: 3,000 lbs)

Our air bearing rotary tables provide ultra-smooth motion, sub-micron accuracy and absolute repeatability for the most demanding applications. Designed and built in-house to extremely tight geometric tolerances, air bearings have no mechanical contacting parts to wear or create drag. The benefit is they are ready to deliver decades of reliable maintenance-free motion.

The HDRT Series is commonly used as the core axis in equipment checking runout (TIR), roundness, squareness, concentricity and parallelism measurements for large part applications. They are ideal as stand-alone units for checking runout of turned parts, optical lens alignment, and assembly applications. Industries such as aviation, aerospace, automotive, energy, optics and medical devices have deployed our air bearings to meet their ultra-precision measurement demands.

We understand that often your metrology needs require operating in harsher environments. That’s why we use the most durable hardened stainless steel air bearing components that afford forgiveness from minor accidental touch downs as a result of low air pressure, excessive loading, or operator error.

Meeting your specific needs by providing configuration flexibility is integral to our design philosophy. All our HDRT Series tables come equipped with dual element filter/regulators and are available with adjustable tilt and center (tip/tilt) worktables. They can be customized with a variety of options and accessories including motor drives, high-resolution optical encoders, digital readout (DRO) displays, inspection-grade granite surface plates and gage stands. (See options and accessories for a complete list.)

If our standard tables don’t fit your application, our precision motion experts can work closely with you to configure a rotary motion solution that will meet your exact needs, including developing custom solutions for the most unique applications.

Features & Benefits

Accurate, Repeatable, Smooth Motion

HDRT model air bearing tables are designed and built by ABTech for heavy-weight applications with weighted pre-loads and offer the following advantages:

    Frictionless and maintenance-free rotary table
    Ultra-precision sub-micron accuracy
    Nearly absolute repeatability
    Highly robust materials that minimize touchdown and gall damage

    Requires standard compressed shop air (60 psi)

Manufactured with tight geometric tolerances, our standard air bearings deliver radial and axial error motion of <10.0 µ” (250.0 nanometers) and angular errors (coning) of 1.0 µ” per inch (25.0 nanometers/25mm).

Air bearings enjoy significant advantages over mechanical bearings or other approaches to precision worktables. Because there are no mechanical contacting parts to wear or create drag, air bearings are near frictionless, providing ultra-smooth, repeatable and maintenance-free motion.

Superior Durability

Metrology is no longer relegated to the quality control lab. Maximizing productivity means exposing measurement devices to harsher environments within the production and assembly processes. To ensure you’ll experience years of service and investment longevity, we use only the most robust air bearing components. That robustness includes the ability to withstand minor accidental touch downs resulting from low air pressure or excessive loading. If an accident does occur, often the air bearing will only require repair rather than complete replacement.

Configuration Flexibility to Meet Your Specific Needs

Part of our “Pride in Precision” philosophy means providing you with precisely the solution you need. We don’t believe in selling our customers more, or less, than what their application calls for. With almost two decades of listening to our customers we’ve been able to develop a broad range of options and accessories to address the majority of ultra-precision measurement applications. (See options and accessories for a complete list.)

But no matter how broad our product options may be, we realize that they can’t address every possible application. And that’s what separates ABTech from most other metrology suppliers. We won’t say sorry, best of luck. Rather, we’ll connect you with one of our precision motion experts and work closely with you to configure a rotary motion solution that will meet your exact needs, including developing custom solutions for the most unique applications.


Working envelope:

  • Max part diameter: 40″ (1.0 m)
  • Axial load capacity (max centered and balanced): 3,000 lbs (1,361 Kg)

Certified accuracy:

  • Radial & Axial accuracy: <10.0 µ" (0.250 µm)
  • Tilt accuracy: <0.206 arc sec or 1.0µ"/in (0.025 µm/25nm)


  • Robust air bearing components with nickel plated worktable
  • 22” (559 mm) diameter worktable
    • 1/4 -28 UNF tapped holes in worktable
  • Air consumption: 4.0 cfm @ 60 psi
  • Standard bolt down base
  • Filter Regulator Assembly (Model 00938A)
    • 5.0 micron pre-filter w/ regulator (0 – 150 PSI)
    • 0.3 micron second stage filter, oil/water removing (coalescing)

All specifications based on vertical axis orientation at 60 psi and are subject to change without notice.


  • Adjustable tilt and center worktables
  • Motor drives and controls
  • Encoders and digital readouts (DRO)
  • Fixed center mount gage stand


  • Custom fixturing and work holder tooling
  • Gage stands
  • MicroTIR electronic gage packages
    • µTIR-10: display with single lever-type electronic indicator
    • µTIR-11: display with single lever-type electronic indicator and encoder interface
    • µTIR-20: display with dual lever-type electronic indicators
    • µTIR-21: display with dual lever-type electronic indicator and encoder interface
  • Granite surface plates
  • Structural steel frames with passive vibration isolation leveling feet
  • Certified 2µ” round master test ball and cover


  • Aerospace
  • Aviation
  • Automotive
  • Energy (gas, oil, wind)
  • Precision optics
  • Medical
  • Bearings
  • Semiconductor

Similar Products:

    AT200 with TC8 Tilt & Center Worktable AT200 (8″ Ø)
    EAS3000-2T P07 Standard Configuration EAS3000-2T
    AT300 With TC8 Tilt and Center Worktable AT300 (12″ Ø)
    AT400 with TC8 Tilt and Center Worktable AT400 (16″ Ø)
    HDRT Heavy Duty Series HDRT660 (26″ Ø)
    MicroForm Model MFG200 µFG200
    MicroForm Model MFG200T µFG200T
    µFG300 Dual Stands µFG300
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Thank you for your interest in ABTech’s ultra-precision measurement tools and services.
Please tell us a little about what you need to accomplish and we will be in touch to discuss any of the additional details that will help you choose your best option.

I just got back from the South Pole last week. Everything there went well. The experiment is now up and running, and the air table is working flawlessly! Marc SmiciklasPost Doctoral Research Associate
Princeton University
Made in the U.S.A.

Every product we sell exemplifies our company-wide commitment to "Pride in Precision" craftsmanship. To that end, all of our products are designed, manufactured, and tested exclusively by ABTech at our New Hampshire facility.

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