A: I do believe it is. We used them on a microwave stand I built and fully loaded it weighs about 200 lbs. and the glides are holding up just fine.
A: I suppose some engineers computed that number. It is probably 75 lb per glide. Otherwise they would be useless under a table or chair. It seems reasonable. The feet and screw will definitely hold more than that. If the plastic nut inserts wear out over time you could easily replace them with T-nuts and they would be even more sturdy.
A: The weight capacity is not on the packaging. From the appearance I suspect that it is per glide.
A: Would say total of four. They are plastic feet, and while thick, probably crack or break under 100lb load.
A: I used them to level two statues. They are sturdy and they are easy to adjust to achieve a level product. My statues were not over 50 pounds each so weight was not an issue. Using 8 if them to support the heavy weight should work well in my opinion.
A: If the bar weighs less than 600 lbs. I think they would be fine.
A: These are three part: anchor, stem and foot.
A: Yes you drill a hole, pound in the anchor and then thread the padded stem. I did 40 chairs (160 stems) in 2 hours. Every few months I replace stems. Heavy use .
A: yes It comes with what is in the picture. Just drill a hole and install. Pretty easy.
A: Comes as pictured
A: Can you get a metal threaded socket, as I find the plastic splits too easily?
A: Yes you will receive the metal stem with the pad on the bottom and the sleeve that the metal stem fits into.
A: These come exactly as pictured. Plastic insert with threaded metal stem. Very simple to use
A: It comes with everything pictured: Felt base and stem, and threaded socket. All you need to do is drill the appropriate size hole for the socket and you are good to go.
A: I would presume this is 75 lbs each. I have them on all my 4 leg chairs and I weigh way more than 75lbs and they are just fine after a years use.
A: Christian would you please provide the part number that you are asking about please?