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Heat treated clips retain these metal threaded connector inserts securely inside tubular legs. Round (R) and Square (S) adapters are available for the following tubing Outer Diameter sizes. Most fit 16 and 18 gauge tubes. Special sizes are available.
Unit of Measure


Fitting Tube Thickness

N/A 16 gauge18 gauge

Tube Outer Diameter

N/A 7/8 in

Thread Size

N/A 1/4 in - 20 3/8 in - 16 5/16 in - 18

Adapter Type

N/A Round Square
Level GlidesLevel Glides
Adjustment KnobsAdjustment Knobs
Metal Threaded Adapters and Tube ConnectorsMetal Threaded Adapters and Tube Connectors
Plastic Components and Tube ClosuresPlastic Components and Tube Closures
Seating ComponentsSeating Components
Polyurethane MoldingPolyurethane Molding
Fixture and Display ComponentsFixture and Display Components

MDI manufactures and distributes quality products including industrial and furniture casters, industrial and office furniture glides and levelers, tube closures, tube connectors, adapters, plastic and metal hardware components. We also stock and offer wide array of adjustments knobs and seating components (bases, arms, foam, wood). We can produce polyurethane molded parts along with custom injection molded parts specific to your needs.