MASTERY MART 28" 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 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!

When this turned up as a small self assembly kit I was dubious that it would meet expectations; surprisingly after assembly the chair base was very sturdy and strong and I am really pleased with it. If I ever needed a replacement chair base again I would be choosing this! Great value for money, easy assembly, looks great and it works really well.

All chairs that use this design should come with a metal base in my opinion. This base is good and sturdy and does the job as expected. This is my second one as I have two chairs where the plastic base has failed around the wheel mountings. This is easy enough to assemble and is sturdy once assembled and you get an Allen key to put it together. The tubes fit a central hub however the fit can be a little troublesome pushing the legs onto the hub especially if you were elderly and have little strength mostly they go straight on but I found 2 of the legs were a little tight. Good product but I reckon £10 over priced.

Solid, decent quality

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.

A crack formed in the plastic base of my "Union & Scale Dexley" chair from Staples, as seen in the "BEFORE" pictures. This caused a tilt that made the chair almost unusable, though the rest of the chair was in excellent condition. I was able to remove the old base using a hacksaw, several hours, several bandaids, and lots of sweat. Installing the new base was simple - it only took a few minutes, 5 screws, and installing the old wheels (which fit perfectly). Now instead of spending $180-$400 on a new chair, my old chair is working good as new ("AFTER" picture). I weigh about 330 pounds, I will update this review if the base fails in the future, but it seems pretty sturdy. I want to reiterate how difficult it was to remove the old base. If you have a crack like mine, know that there is a metal ring on the piston that digs into the plastic, basically fusing with the base. No amount of hammering will get it off. You will need to cut it off like I did, though interestingly the base was pushed so far up that I could have just put the new base on the bottom and it would have worked fine (2 bases!). I think if I get a new chair with a plastic base in the future, I will hammer off this one and use it again instead. Plastic bases are trash.

Se ve que estos soportes son soldados a mano, por las malas reseñas que vi yo creo que mejoraron la forma en la que hacen las soldaduras porque se ven mejor hechas cerca de todos los ángulos

Muy buen producto y buena calidad. Lo compre para remplazar la base de mi silla que se habia roto.

Va genial, a sido una buena compra, se utiliza a diario, y queda mucho más firme la silla.

المنتج رائع جدا و جيد حتي في الاوزان الثقيله