---
product_id: 496054989
title: "MASTERY MART 28\" Heavy Duty Office Chair Replacement Base (2400Lbs), Office Chair Base Replacement with Universal Caster and Gas Cylinder Size, Matte Black"
brand: "mastery mart"
price: "€ 167.76"
currency: EUR
in_stock: true
reviews_count: 11
category: "Mastery Mart"
url: https://www.desertcart.es/products/496054989-mastery-mart-28-heavy-duty-office-chair-replacement-base-2400lbs
store_origin: ES
region: Spain
---

# Standard 11mm caster sockets 2400 lbs load capacity Universal 2" gas cylinder fit MASTERY MART 28" Heavy Duty Office Chair Replacement Base (2400Lbs), Office Chair Base Replacement with Universal Caster and Gas Cylinder Size, Matte Black

**Brand:** mastery mart
**Price:** € 167.76
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your throne with rock-solid support and sleek style!

## Quick Answers

- **What is this?** MASTERY MART 28" Heavy Duty Office Chair Replacement Base (2400Lbs), Office Chair Base Replacement with Universal Caster and Gas Cylinder Size, Matte Black by mastery mart
- **How much does it cost?** € 167.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/496054989-mastery-mart-28-heavy-duty-office-chair-replacement-base-2400lbs)

## Best For

- mastery mart enthusiasts

## Why This Product

- Trusted mastery mart brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless DIY Upgrade:** Quick 15-minute assembly with included hex bolts and wrench—get back to work faster and smarter.
- • **Premium Matte Black Finish:** Sleek, polished chrome-plated metal base that elevates your workspace aesthetics while resisting wear.
- • **Floor-Friendly & Safety-First:** Low center of gravity design protects your floors from scratches and keeps you steady during long work sessions.
- • **Unmatched Strength & Durability:** Supports an industry-leading 2400 lbs load for ultimate stability and peace of mind.
- • **Seamless Universal Compatibility:** Fits most office and gaming chairs with standard 2" gas cylinders and 11mm casters—no guesswork needed.

## Overview

The MASTERY MART 28" Heavy Duty Office Chair Replacement Base is a robust, matte black metal base engineered to support up to 2400 lbs. Designed for universal compatibility with standard 2" gas cylinders and 11mm casters, it offers a premium upgrade from plastic bases. Its reinforced tubular steel construction ensures long-lasting durability and floor protection, making it the smart, budget-friendly choice for professionals seeking reliability and style in their workspace.

## Description

MASTERY MART 28" Heavy Duty Office Chair Replacement Base (2400Lbs), Office Chair Base Replacement with Universal Caster and Gas Cylinder Size, Matte Black : desertcart.co.uk: Home & Kitchen

Review: Metal Chair Base - 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.
Review: Reassuringly well made - 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!

## Features

- 🥇【Universal Size】This office chair base replacement is suitable for most chairs on the market, including Herman Miller (office chair, gaming chair, executive chair). Casters: 7/16 inches x 7/8 inches (11 mm x 22 mm); gas cylinder: 2 inches (5 cm).
- 🥇【Premium Craftsmanship】Crafted from top-grade chrome-plated metal, this heavy-duty base features a polished matte finish. Its robust tubular steel build, reinforced with sturdy screws, ensures enhanced load-bearing capacity and safety, supporting weights of up to 2400 lbs.
- 🥇【Safety & Floor Protection】Our office chair base replacement prioritizes stability, preventing floor scratches and enhancing safety by maintaining a low center of gravity. This not only safeguards your floors but also saves you from the costs of replacing your chair.
- 🥇【Budget-Friendly Solution】Opting for a chair base replacement at a fraction of the cost of a new chair is a smart decision if your seat is still in good condition. Save money while retaining your beloved chair.
- 🥇【100% Satisfaction Guaranteed】Very easy to install with our simple and clear instruction sheet. If this doesn't fit your chair, you can simply return it for a full refund.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09X4MHQP4 |
| Assembly type | Require Assembly |
| Best Sellers Rank | 123,278 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 436 in Desk Chairs |
| Capacity | 28 inches (W) x 28 inches (L) x 4 inches (H) |
| Care Instructions | Wipe Clean |
| Colour | Matte Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,020) |
| Date First Available | 10 May 2022 |
| Disclaimer | China |
| Finish type | Painted |
| Footboard upholstery | Metal |
| Is assembly required | No |
| Item Model Number | MM-BASE-REP-C-BLACK |
| Item model number | MM-BASE-REP-C-BLACK |
| Item shape | Round |
| Manufacturer | Mastery Mart Inc. |
| Mattress comfort | Recliner |
| Number of boxes | 1 |
| Primary material | Metal |
| Product Dimensions | 71.12 x 71.12 x 10.16 cm; 3 kg |
| Seat height | 28 Inches |
| Shipping weight | 3.12 Kilograms |
| Style | Matte Black |
| Top material | Metal |
| Type of wood | Metal |
| What is in the box? | Office Chair Base |

## Product Details

- **Brand:** MASTERY MART
- **Colour:** Matte Black
- **Material:** Metal
- **Product dimensions:** 70D x 70W x 10H centimetres
- **Size:** 28 inches (W) x 28 inches (L) x 4 inches (H)

## Images

![MASTERY MART 28" Heavy Duty Office Chair Replacement Base (2400Lbs), Office Chair Base Replacement with Universal Caster and Gas Cylinder Size, Matte Black - Image 1](https://m.media-amazon.com/images/I/51HZozdXLlL.jpg)

## Questions & Answers

**Q: Does the bear in the first image come with the purchase, or do i need to buy one separately?**
A: Gotta buy it separately, but still a great product

**Q: Will this fit a serta executive high back office chair with lumbar support ergonomic upholstered swivel gaming friendly design?**
A: Can’t really say as I don’t know the chair. If it has a standard base it should fit without any issues. I used the one we bought for a gaming chair and it worked great.

**Q: Are the wheel inserts metal as well? My chair came with a metal base, but the inserts where the wheels fit into it were plastic and broke.**
A: I believe it's all metal..

**Q: Is the base one piece?**
A: No the base is not one piece.  The base must be assembled.  However, the way it constructed makes it very strong.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Metal Chair Base
*by F***L on 9 June 2025*

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.

### ⭐⭐⭐⭐⭐ Reassuringly well made
*by P***B on 30 November 2024*

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!

### ⭐⭐⭐⭐⭐ Really well made
*by M***S on 26 October 2024*

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.

## Frequently Bought Together

- MASTERY MART 28" Heavy Duty Office Chair Base Replacement Parts, 2500 Lbs, Desk Chair Reinforced Metal Leg with Universal Gas Cylinder Hole and Casters Sockets, Matte Black
- Mastery Mart Office Chair Caster Wheels for Hardwood Floors, Heavy Duty and Quiet Smooth Rollerblade Wheels for Office Chair, Universal Size (11x22mm), Suitable for Most Chairs
- MASTERY MART Office Chair Gas Lift Cylinder Replacement, 4" Travel Length, Heavy Duty 450 lbs, Hydraulic Pneumatic Shock Piston, Universal Size Fits Most Office Chairs, Class 4, Matte Black

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-02-05*