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Currency - All prices are in AUD

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Selecting Parts

Arm Pads | Bases | Casters | Gas Cylinders

Arm Pads

Please refer to the photo below to answer the following questions:

What is the distance between mounting holes (measurement A)?
What is the overall length (measurement B)?
What is the width at both ends (measurements C/D)?
What is the size of the cut out required (measurement E)?


A few notes on measurements:

- The mounting holes are the most important part and this must be exact.
- The cutout can be +/-, as long as the top of the arm (where the pad is bolted on) is smaller than the replacement pad's cutout.
- The length and width can vary from the existing size completely, as much or as little as you prefer.


1. Locate cylinder column which connects the cylinder to the base. Sometimes there is a plastic cover that you can slide up.

2. Measure the diameter of the cylinder column (should be 2")

3. Set tape measure right up against the cylinder column and measure to the end of the leg.

4. Double the leg length and add 2". i.e. If the leg length is 13", double it to 26" and then add 2". The diameter is 28"


How do I determine my stem size?

Measure the diameter and the length. We offer two standard sizes, as well as threaded stems (see below).

7/16" x 7/8" 5/16 x 1-1/2"
Standard for a chair with plastic or metal base

Standard for a chair or furniture with wooden legs


Now what?

Once you've determine your stem size, you know they'll fit your chair - so the rest is up to you! Choose the same one, a bigger one, a smaller one - or even a shinier one!

Like simple? Stick with black.
Feeling fancy? Go for chrome! 
Have a passion for patina? Check out the antique brass!

How do I measure my wheel size?

Diameter is measured across. So, measure the wheel only - from one side to the other.


Should I choose hard or soft wheel casters?:

This is an easy one - Hard floors need soft wheels, soft floors need hard wheels:

  • Hard floor - laminate, stone, hardwood, brick, tile, linoleum
  • Soft floor - carpet or carpet tiles

What about that plastic neck thingy?

That is technically called a barrel. If the end of your base leg - above the caster - is 1.5" across or wider, you can use a caster with a barrel. Barrels serve aesthetic purposes only, so if you don't know what to do, skip it. Or, if you have a barrel already - or like how they look, choose a caster with a barrel!


I have casters with a threaded stem; how can I tell if they're the size you offer?: 

Chairpartsonline offers 1/4-20 and 5/16-18 stems. This measurement is key to obtain before ordering. 

Step 1: Measure the stem diameter (we offer 1/4" or 5/16"). 
Step 2: Measure the length of the threaded portion of the stem
Step 3: Determine threads per inch (TPI). E.g. If you have a .5" long thread with 10 rows, you can easily calculate that the same thread in 1" would have 20 rows. 

Thread dimensions are stated as diameter-TPI. Or 1/4"-20 TPI.

Note: You can usually replace a longer stem with a slightly shorter stem. If you have a shorter stem and want to use a longer, stick a small object up into the hole to measure the full depth - usually there's extra space beyond the existing stem, but you'll want to confirm.

The tread of my soft casters is crumbling - why?

This may occur due to age, if the flooring or wheels are exposed to UV radiation, or due to the use of heavy cleaners on the flooring or wheels. In all cases, replacement is recommended.

Gas Cylinder

Our office chair cylinders are typically universal. The only difference between all standard cylinders is what height they make your seat. So, whether you want to keep it simple or get technical, we're here to help! 

Wondering if your cylinder is "standard"?

If this column is 2" in diameter, you have a standard cylinder.

**Be sure to measure as shown in this photo (do not measure the underside).