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.

I bought an AK Racing brand chair nearly two years ago for just over £300 from a nearby Computer Shop.Last week one of the plastic legs broke off taking the castor with it.I wasn't happy with taking a perfectly good chair to be recycled due to one failure and I was unsure as to the manufacturers warranty or if it even applied.After looking at Amazon on the remote chance I could buy a replacement base, I came across this fantastic 'universal' base.The new base arrived in a shoebox sized package and took less than five minutes to assemble.What do I like about it?The legs on this base are made out of metal, my existing wheels / castors fitted perfectly and the base's centre hole is the standard 50 mm bore which matches most, if not all, chair piston diameters.As for removing the original base from my chair? That took about an hour of hacksaw and mallet work!Right now, my AKRacing chair with this new base fitted is sturdier and more solid than it originally was, probably due to the metal legs.Overall, i'm very happy.

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.

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.