Attachment Types

An expandable adapter stem is used on a caster when you need to install it into a hollow tube or leg of varying inner diameters, such as those found on scaffolding, carts, or tubular furniture. Here’s why you’d use one:

• Fits a Range of Sizes: The expandable mechanism allows the stem to adapt to different inner diameters, providing a secure fit even when exact measurements vary.
• Strong, Vibration-Resistant Hold: Once tightened, the adapter expands inside the tube, creating a tight, non-slip grip that resists vibration and movement.
• No Welding or Threading Needed: Allows for installation in plain tubing without pre-installed threads or inserts, simplifying retrofits or custom builds.
• Reusable and Adjustable: Expandable adapter stems can be easily removed or repositioned, making them ideal for adjustable or temporary setups.
• Ideal for Round Tubing: Commonly used in scaffolds, medical equipment, rolling racks, and retail fixtures that use round hollow tubing.

In short, an expandable adapter stem is the best choice when mounting casters into hollow, unthreaded tubes where a tight, adjustable fit is needed without permanent modification.