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Need to replace electric loft hatch belt - Measure size?
powerful_Rogue
Posts: 8,491 Forumite
Afternoon all,
I need to replace the belt which opens the motorised loft hatch. It's stretched so keeps coming off.
Just need to work out how I find out what size I need to order and whether these kind of belts have a particular name at all?
(I had to cut it to get it off)
Thanks in advance

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Comments
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There are a whole raft of different toothed belts. The pitch of the teeth and the profile varies. But it looks like you have a fairly "standard" one. Best bet is to visit a local bearing supplier and take the old belt with you.
Any language construct that forces such insanity in this case should be abandoned without regrets. –
Erik Aronesty, 2014
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.1 -
Most have the size and make on the back .1
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Is there a reason you haven't asked the unit's manufacturer?
Do you know the make and model?
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ThisIsWeird said:Is there a reason you haven't asked the unit's manufacturer?
Do you know the make and model?
Will get back up in the loft today and have a look for some details.
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Well you learn something new every day. I've never heard of an electric loft opener before.
Make £2025 in 2025
Prolific £841.95, Octopoints £6.64, TCB £456.58, Tesco Clubcard challenges £89.90, Misc Sales £321, Airtime £60, Shopmium £52.74, Everup £95.64 Zopa CB £30
Total (1/11/25) £1954.45/£2025 96%
Make £2024 in 2024
Prolific £907.37, Chase Int £59.97, Chase roundup int £3.55, Chase CB £122.88, Roadkill £1.30, Octopus ref £50, Octopoints £70.46, TCB £112.03, Shopmium £3, Iceland £4, Ipsos £20, Misc Sales £55.44Total £1410/£2024 70%Make £2023 in 2023 Total: £2606.33/£2023 128.8%0 -
Nor me, but now I want one. Even tho' I don't have a loft.2
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Went up and took some pictures of the markings I could see, but sadly no luck googling online - Unless they mean anything to anyone else!



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21T5-V42 is a timing wheel pully specification I think.
42 teeth, T5 metric profile, 21mm pulley (probably 10mm belt).
I could be wrong though1 -
BarelySentientAI said:21T5-V42 is a timing wheel pully specification I think.
42 teeth, T5 metric profile, 21mm pulley (probably 10mm belt).
I could be wrong though
Thanks, I shall look into that.
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