MASTERY MART28" Heavy Duty Office Chair Replacement Base (2400Lbs), Office Chair Base Replacement with Universal Caster and Gas Cylinder Size, Matte Black

Bought as a replacement for the ABS plastic base on my chair.The black metal low profile base comes in a shoebox sized package. Assembly is required.There are 5 spokes, a central Hub, and a cosmetic plastic cover.All parts are individually plastic wrapped to protect the powder coat.Also supplied is a packet of m6 hex bolts and an allen key/hex wrench.There is only one way a spoke will fit on the hub and the spokes are identical. My hub had two drilled holes per spoke but only the one closest to the center had threads to receive the bolt.There is a reasonable friction fit on the spokes so take care to align the the holes for the bolts when sliding the spoke onto the hub as it may take a little bit of force to move it around.Base is exactly the same size and height as the plastic one it replaced. Center opening is a standard 2"/50mm and my gas lift fit perfectly. No wheels were supplied but again the spokes have sockets for a standard 11mm caster and the wheels from the original base fit perfectly.Assembly was straightforward and took about 15 minutes.It was delivered at 12.30 and I was sat in my chair writing this review by 1pm.Reassembling the Chair was straightforward (!! remember to put the plastic cover on the gas strut first!)!Probably the most difficult bit was pulling the wheels off the old base.(firm grip and steady pull while twisting)My immediate impression is that it feels solid and sturdy. It seems well made with clean looking welds.I'm a big fella and use my chair daily. If anything goes wrong I'll be back here to tell you about it.Tip. Check on the hex bolts after a week or so, and regularly after that as they will almost certainly loosen over time. Tape the allen key to the bottom of the chair so it is handy if you need it.

I am a big person, and I found all previous office chairs failed in the same way. The gas cylinder would keep getting lower in the base, until it was dragging on the floor itself. These bases were all plastic.However, this base is 100% metal. Easy to assemble. After 8 months of daily use (about 4-6 hours a day), the base is still incredibly strong, and the gas cylinder has stayed put. I am able to move my chair easily. I wish I had known about this base sooner.100% Recommend.

I bought this steel replacement for a plastic cheapie which was fitted to my Melokea S1 chair, this failed after only 6 months use, despite it claiming to be "heavy duty". I was tempted to go for a one-piece aluminium part, but the one I was looking at was only rated for 400 lbs, whereas this one is 2400! The package is neatly packed and fits very precisely together, 5 Allen keyed bolts holding the legs onto the very solid steel central part. Took no more than 5 mins to put together, but don't forget to put the plastic guard over the end of the seat post BEFORE fitting the post into the base, as once you've sat on it, it's difficult to remove!!There is no hint of movement in the legs themselves once the Allen keys are fitted, given the quality of the steelwork and the precision with which they fit together, I can see why this item is relatively expensive (I paid £43) but over all I think the product is good value for money.If only chair manufacturers fitted decent bases in the first place..... but I guess this would make them a lot more expensive. I'll certainly never buy a chair with plastic base again, particularly now I have this metal one!I went for a nice set of soft rolling double castors as well, much nicer than the originals.So OK I have spent as much repairing the chair as it originally cost, but at least I know the base won't fail!

A solid base. Fits standard sized castors, so just swapped them over from the old one. Centre hole slightly under sized, but not a big problem.Self assembly a little fiddly and took about 10 minutes from unboxing to using the chair. After a month, works just fine and still looks shiny. Being a lump of metal, likely to last a lot longer than the original moulded plastic.

Great replacement for my RAZER Tarok PRO Gaming Chair. The chair sits a bit higher now but at least the base won’t snap and result in the gas lift cylinder scraping on the floor.

My lad is quite a substantial young gentlemen and is prone to small repeated movements when sat down and when he went to University he quickly broke the large office chair he taken with him that we had bought for him. The plastic chair base breaking in a couple of places with stress cracks. I bought a cast aluminium base to rebuild the chair with and that lasted about 9 months before again he managed to stress crack it into breaking - no I'd never seen that before either! Anyway this purchase was my final attempt at finding a decent chair base that might go the distance, and it has worked a treat. It was easy to fit castors to (also heavy duty!) and easy to mount the rest of the chair too. Its certainly taken everything he has thrown at it for the last 2+ years and has returned home with him for continued use. I also thing its pretty good to look at too, better than the more cumbersome looking plastic bases.