I used these 3 inch wheels on a 6x3 foot workbench designed for heavy use in aircraft hangars. The first thing I noticed was that the axle holes are not exactly concentric. on the outside of the wheel so it rolls in an odd way (slightly but not smoothly). Tolerances in the ball bearing ring and cage are not exact. With locked wheels, the workbench is not rigid. The problem isn't the wheels slipping on the floor (locks interfere with rolling) but the wheel parts wobble because the tolerances are so tight that I have no doubt that with a heavy load and any bumps in the floor, the ball bearings will jump off track. Additionally, the locks only prevent the wheels from rolling and don't turn them, so the bench moves side to side and back and forth easily even when the wheels aren't rolling. loaded items that are rarely used but are clearly not my first choice for anything that requires rigidity or the ability to withstand high vertical or lateral loads during use.
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