Would it be ok to tap these out to standard pitch M10?
Cheers
Chris
I need to fix my engine in place, it has M10 x 1.25 fine threads into an aluminium crankcase, but I don't have the correct bolts.
Would it be ok to tap these out to standard pitch M10?
Cheers
Chris
I would have thought it would strip or cross the threads, making it less effective.
NO... dont do that! Course threads in aluminium dont work at the best of times hence why most are fine....
Trying to switch between fine and course would just FUBAR the hole!
Message received and understood!
Thanks chaps 
Chris
try these chris http://stores.shop.ebay.co.uk/WVS-FASTENERS_METRIC-FINE_W0QQ_fsubZ13QQ_sidZ124709800QQ_trksidZp4634Q2ec0Q2em322
Cheers Tony
quote:
Originally posted by tegwin
NO... dont do that! Course threads in aluminium dont work at the best of times hence why most are fine....
Agreed. Everything on a Rover V8 (aluminium block) is UNC.
japanese
You could always fit helicoil or re-coil wire inserts and convert to 'standard' metric pitch.
Just buy the correct bolts!
They wont be expensive and its the right way to do it
quote:
Originally posted by Jimbob
Just buy the correct bolts!
They wont be expensive and its the right way to do it
It was just an idea to save some time)
Soft metal should have coarse threads - stuff like aluminium is too weak to support fine threads in the way steel can.
It depends on your definition of 'fine' of course!
quote:
Originally posted by David Jenkins
Soft metal should have coarse threads - stuff like aluminium is too weak to support fine threads in the way steel can.
It depends on your definition of 'fine' of course!
It's no the finest M10, you can also get M10x1.0
So maybe x1.25 is a good comprimise.
I have taps and dies in my toolbox for 1/2" x 40tpi - that's fine!
(It's a model engineering thread, easy to set up for thread-cutting in an imperial lathe)