Anyone know a good source of acme or butress threads?

Looking for some lengths a meter or longer. Holding about 250 kilos each. Square would be fine but I hear they are dearer.

You could try getting hold of a couple of lathe leadscrews. I have also seen lengths of thread on ebay under the guise of leadscrew...
Rgds.
Pete.

http://search.ebay.co.uk/search/search.dll?from=R40&_trksid=m37&satitle=leadscrew

[Edited on 22/11/07 by r1_pete]

Op Nuts and lift screws from a Laycock Coranation Car lift would fit your spec plus a large saftey margin --- new Nuts are about 60 quid each getting hold of screws is the difficult bit.

http://www.marchantdice.com/ballscrews/ are the suppliers of these components.
BT look at this oldtime advert

quote:

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Originally posted by britishtrident
Op Nuts and lift screws from a Laycock Coranation Car lift would fit your spec plus a large saftey margin --- new Nuts are about 60 quid each getting hold of screws is the difficult bit.

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Cheers chaps.