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MASTERY MART

MASTERY MART Office Chair Gas Cylinder Replacement Kit, 6" Stroke Heavy Duty Hydraulic Pneumatic Piston, 1000 lbs Capacity, Universal Fit for Desk Chairs, Easy Installation with Removal Tool & Gloves

  • Based on 79 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Jul 22
Order within 10 hours and 38 minutes
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Size: 6'' Travel Length


Features

  • Correct Size & Universal Fit Outer cylinder diameter 2" (50mm), inner piston diameter 1" (28mm), minimum length 11.5" (293mm), maximum length 17.5" (445mm) with a 6" (152mm) adjustable stroke. Fits 99% of office and gaming chairs, including Herman Miller, Steelcase, Secretlab and more.
  • Heavy Duty Class 4 Hydraulic Lift Built with reinforced steel for maximum durability. Supports up to 1000 lbs, ensuring stable, safe, and longlasting performance without sinking.
  • Easy Installation Kit Included Comes with removal tool, protective gloves, and stepbystep instructions. Even firsttime users can swap the old cylinder and install the new one without special equipment.
  • Fix Your Sinking Chair in Minutes Replace your broken or leaking office chair gas cylinder and restore full height adjustability. Stop struggling with chairs that keep sliding down.
  • Save Money & Guaranteed Support Extend the life of your chair at a fraction of the cost of buying new. Backed by lifetime warranty and responsive customer service if your cylinder leaks or sinks, well replace it for free.

Brand: MASTERY MART


Color: Black


Material: Metal


Product Dimensions: 11.5"D x 2"W x 2"H


Size: 6'' Travel Length


Brand Name: MASTERY MART


Additional Features: Gas Lift Cylinder Replacement


Unit Count: 1.0 Count


Recommended Uses For Product: Office


Age Range Description: Adult


Included Components: Screw Kit


Model Name: MM-GAS-LIFT-BUNDLE-AD6BL


Surface Recommendation: Hard Floor


Indoor Outdoor Usage: Indoor


Model Number: MM-GAS-LIFT-BUNDLE-AD6BL


Manufacturer: Mastery Mart Inc.


Manufacturer Part Number: MM-GAS-LIFT-BUNDLE-AD6BL


Material Type: Metal


Frame Material Type: Metal


Seat Material: Alloy Steel


Fill Material: Plastic


Color: Black


Back Style: Mid Back


Style Name: Compact


Pattern: Solid


Shape: Round


Arm Style: Armless


Leg Style: Straight Leg


Form Factor: Recliner


Item Dimensions D x W x H: 11.5"D x 2"W x 2"H


Size: 6'' Travel Length


Item Weight: 1 Pounds


Seat Depth: 17.72 inches


Item Dimensions: 11.5 x 2 x 2 inches


Item Depth: 6 inches


Reclining Position Count: 1


Tilting: No


Maximum Weight Recommendation: 1 Pounds


Assembly Instructions Description: Included


Required Assembly: Yes


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Solid product, gloves are nice addition to kit
Size: 6'' Travel Length
I have only had this for a week so can't comment on longevity, but the cylinder has been great so far. Due to a filing cabinet next to my standing desk, I could not lower the desk far enough to be comfortable using it while sitting in my office chair. If I can;t lower the desk, then I will have to raise my butt. The piston that came with the office chair did not go up high enough so I searched for a replacement that was like Goldilocks's porridge - not too low, not too high. The low is a little bit higher than the original which allows me to still have my feet flat on the ground in that position. The final spot is about 75% raised which works perfectly for my setup and I can put my feet on the cross support of my desk. Eventually I may get one of the foot rest rings to install on the chair but for now I don't think I will need it. The cylinder comes with grippy gloves, which keep your hands clean of lube and allow you a good hold when trying to pull out the original cylinder. They weren't enough for my job as the original was held in place very well. I picked up a channel lock wrench at HD and that gave me the grip and leverage to remove the cylinder. The new one slipped right in. Easy install of the new. I'm not really sure what the rings are for that came with the set so I didn't install them. Maybe to keep the cylinder from pushing too far into the seat bottom? No idea. Overall, 10/10. Would buy again. ... show more
Reviewed in the United States on September 20, 2024 by NS
    • Reasonably priced
Size: 6'' Travel Length
We purchased a "new" chair from a bin store and when we opened the box the cylinder was missing so I ordered this one to give it a try. It fit the chair fine, although it is a little bit tall even in the lowest position, but it still fits under the desk so it is fine. It functions as it should, and came with the cylinder removal tool so in the future when we have chairs that break or the leather or fabric goes bad, we can at least salvage the cylinder for another chair that has a cylinder failure (I have thrown out 2 chairs in the past due to that, before realizing you could just get a replacement). Even with buying this cylinder separately along with the price paid for the chair at the bin store it was still cheaper than the chair sells for normally, so we're still $65 ahead. ... show more
Reviewed in the United States on April 30, 2025 by Kevin Smith
    • removal tool may not work for tight fits
Size: 6'' Travel Length
The gas lift works great, but the removal tool was not able to get a grip on the old cylinder; too tight. I was able to get it off with a pipe wrench.
Reviewed in the United States on December 1, 2025 by Leslie Zacks
    • Poor product instructions, customer support and mechanics
Size: 6'' Travel Length
A product that does not work. Let's start with the instructions which are printed so small that not even a magnifying glass can decipher them. The worst product instructions that I have ever seen. Now, the Mastery Mart website, once you find it because it is not included in the product. There is no customer support or printed instructions for their Gas Cylinder Replacement Kit. Let's move on to the product itself, evidently the supplied ring tool parts are cheap aluminum alloy. After several hours of trying, it could not remove the old cylinder from a Samsonite desk chair. Do not buy this product. I wasted my money on it so take my advice. I wish that I could give it zero stars. ... show more
Reviewed in the United States on April 16, 2026 by Phillip A. Chastain
    • Tool works kinda. . .
Size: 6'' Travel Length
The tool works fine if you superglue the parts with the bots to the tube. Otherwise no mater how tight I had it, it slipped on the tube.
Reviewed in the United States on March 11, 2026 by Tom
    • Good product. Taller than normal.
Size: 6'' Travel Length
Easy to install. Note this is taller than most which can be a good thing or a bad thing. Works fine. The parts to help remove the old one are a bit tricky
Reviewed in the United States on March 11, 2026 by H. Pressman
    • Seem like it is well built
Size: 6'' Travel Length
works as it should!
Reviewed in the United States on May 26, 2026 by Gregg Stoxen
    • Removal
Size: 6'' Travel Length
Works great…just don’t rely on the removal tool to be helpful
Reviewed in the United States on February 25, 2026 by Amazon Customer

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