A sliding window that drags, jumps or won’t stay shut is almost always telling you the same thing: the rollers are worn. Replacing them is a cheap fix, until you order the wrong ones and wait for a second delivery.
If you plan to buy window rollers, a few minutes of checking at the start saves the most annoying part, which is returning to do it again.
Start with the old roller
Take the sash out and remove the roller. Photograph it from the side and the front. Measure the wheel diameter, the width and the overall height of the housing. Note the shape of the bracket and how it fits into the frame.
Rollers look similar but fit differently. A wheel that is off by a few millimetres will sit wrong on the track. So measure twice, and keep the old part for comparison.
Work out the weight
Rollers are rated for the weight they carry. Estimate the weight of the sash, especially if the glass is thick or double glazed, and check the product’s rating. Doric lists a carriage for window use, the DR403, rated at 40kg.
Prices and availability can change, so check the product page before you order.
Window or door roller?
A common slip is buying a door roller for a window, or the other way round. Doric stocks sliding window rollers such as the DRZ016, DRZ018, DRZ019 and DRZ020, and separate door rollers like the DR2210 and DR2220. They are different parts for different loads. Read the product description and compare it with your measurements.
Deal with the lock while you are there
If the window has been hard to close for months, the lock may be worn as well. Doric stocks sliding window locks, including the DS6007 Avon sliding window lock. It is worth checking it while the sash is out of the frame.
Why buying from a hardware specialist helps
Doric has supplied door and window hardware in New Zealand since 1998. A specialist range means you can compare similar rollers side by side, and the product pages carry the model codes you need to match your part.
Delivery is available nationwide, or you can collect from the Auckland warehouse. If you are unsure which roller suits, call +64 9 415 5535 and describe what you have.
A short buying checklist
Keep the old roller. Measure wheel diameter, width and housing. Note the weight of the sash. Decide window or door type. Check the product code against the listing. Then order.
If you have more than one window with the same problem, replace all the rollers on that sash at once. A mixed set, with some worn and some new, tends to wear unevenly.
Before you refit the sash, clean the track. Old grit and dirt wear a new roller quickly, and a clean track is part of what makes the fix last. Check the track itself for dents or damage too, since a damaged track will chew through new wheels.
Frequently asked questions
How do I know if my window rollers need replacing?
Common signs are a sash that drags, sticks or rocks, and visible wear or flat spots on the wheels.
Can I use a door roller on a window?
Not as a rule. Window and door rollers are designed for different loads and track types, so match the part to the product description.
Does Doric deliver nationwide?
Yes, delivery across New Zealand, with collection from the Auckland warehouse also possible.
Where can I get help choosing?
Call +64 9 415 5535 with measurements or a photo of the old part.
A roller is a small part with an outsized effect. Get the measurement right and the window feels new.
