Expanding Adapter Casters | Rubber Expansion Stem Casters

EXPANDING RUBBER STEMS - 3" thru 5" - up to 350 lbs

Expanding Adapter Casters

Round rubber expansion stems for round or square tubing • 3"–5" wheels • ~300–350 lb capacity (model dependent)

What an expanding adapter caster does

Expanding rubber adapter casters lock into hollow legs / tubing by tightening an internal mechanism that expands a rubber sleeve against the inside wall. Result: a tight, rattle-resistant fit without threaded inserts, weld plates, or through-bolting.

Fast retrofit for equipment with open-ended tubular legs
Common on commercial prep tables, work tables, racks, and mobile fixtures
Good choice when you can’t access the inside of the leg for a nut/washer

Typical configuration (varies by model)

Wheel diameter range

3" to 5"

Capacity range

~300–350 lb per caster (verify per SKU)

Mount type

Round rubber expansion adapter

Fit note

Match your tubing inside diameter (ID) to the adapter size

Expandable adapter sizes (click to expand)

Common adapter sizes offered in this category include: 3/4", 7/8", 1", 1-1/8", 1-3/16", 1-3/8", 1-1/2", 1-3/4" (select by tubing inside diameter).

Why round adapters are preferred (even for square tubing)

Round expansion sleeves generally apply force more evenly and tolerate minor ID variation better than square-style adapters. In square legs, the rubber expands to fill gaps and corners for a stable fit.

Selection notes for OEM/MRO buyers (click to expand)

Measure ID, not OD: the adapter indexes off the inside diameter of the tube/leg.
Check leg thickness: thin-wall tubing may need careful tightening to avoid distortion.
Load math: total load ÷ number of casters, then add a safety margin for shock/impact.
Floor & debris: larger wheels (when available) roll easier over grout lines and thresholds.