caster wheel rating.

[SavannahLion]

I always forget. When calculating caster wheel weight ratings, is the rating for each caster or for a set of four?

For instance, if a single caster is rated for 200lbs, then using four casters means that the total rated weight load is 800lbs?

Some of these casters seems really light duty to be bearing a 200lb load without busting a weld or grinding out the bearings.

[WaRpEd]

If I remember my hardware correctly the rating is the amount each loaded wheel can carry safely.
So a 100 lb capacity wheel on each corner of a evenly distributed load SHOULD hold 400 lbs. The problem comes with an uneven load like a arcade cabinet ie. the monitor is front heavy.
My advice is to use a wheel or caster that can carry about 20 percent more than the total weight of the loaded cabinet.
Hope that helps. 

[bfauska]

That's how I've always read the ratings, and I build things with 20 casters holding 1500lbs. The reason I use that example is to point out that a rating system based on using 4 casters would only apply sometimes in the grand scheme of things, an individual rating is much more useful overall.

Assuming an even load 4 casters rated for 100lbs ea. should carry 400lbs.

[SavannahLion]

Thanks for the answers. That's what I figured.

It's hard to tell with these casters and how some of them are marked... or not marked.