crank tap (5/8 x 16 whitworth) supplier
Turbo Mini Forums

we have had problems with a thread on one of the cranks that we have here.

so im after the above tap.

Minispares have them advertised but they are out of stock

does anyone know who may stock/supply these?

or does anyone have a spare that they might be willing to part with?

cheers, dan

Cut some slots in an old bolt and use it as a thread cleaner?

I got mine from minimania in the u.s. You can borrow mine if you are not in a rush for it.

presto tools were able to supply when I last enquired but it was over £100 and that was a good few years ago

I have one I can lend out for a paypal deposit then reimburse when i have it back.

Yeh lol why the fuck did Austin dream up such a bastard thread?......Still no real answer to that question lol

I got mine from MRA

Class C 3rd Place Avon 2011 14.18 @101mph

if the threads are fooked the tap you need is 5/8" uns s is for " special" a slight nats pitch difference to re instate the thread, available on ebay but pricey around £40 billys

without going in the shop the pitch I think its 18tpi but I may stand corrected ?

here's a link http://www.ebay.co.uk/sch/i.html?_odkw=5%2...ns+tap&_sacat=0

hope this helps

Edited by BENROSS on 21st Sep, 2013.

hi chaps, cheers for the offers and advice. we now have this sorted.

but thanks again, it is very much appreciated

dan

Sprocket, in practice what is the difference?

Pedro Silva

http://miniciados.blogspot.pt/

Main difference is that whit is 55degree form vs 60degree for metric and UNF/UNC, and that it has a rounded crest and root. The lack of visible "roundage" is why the form is debated so much IMO. The difference between the 55 and 60 degree is pretty hard to measure short of using a shadowgraph. I don't know if anyone has actually used this piece of equipment to measure the thread, but until i hear proof, iI don't think we'll ever know for sure. It'd be a good idea to section a crank tail, and a bolt if anyone was really interested in doing this and proving the answer once and for all.

Edited by TurboDave16V on 22nd Sep, 2013.

I bought a 5/8"x16 UNS tap from a hardware store in South Carolina years ago and have been using it successfully ever since.
Used it to reclaim a couple of utterly buggered cranks where a puller had been used without blanking plate and chewed up the threads (one was smooth) and both engines are working fine without losing the flywheel.

Metric is for people who can't do fractions.