Question: tap and die set sizes

[Mike K]

HANNO


British BSW ( british standard whitworth) threads will interchange with UNC American threads ..... BSW has a 55 degree thread angle and UNC is 60 degrees.. but for practical purposes .. they fit OK .. EXCEPT for the 1/2" size ..this size has different TPI threads per inch .

The BSF .. (british standard fine) threads are found on British MAKES .... my Morris has them everywhere ... along with metric threads on the motor .

Mike

[Phil Waterman]

Hi All

Would add the comment I own one very good set of taps and dies which I use only for cutting new threads or chasing really important existing threads.

For all work cleaning threads of dirt and in particular rust I use the cheap taps and dies which I consider consumables once they start to dull.

For cleaning threads I have also found that the twisted wire brushes in various sizes are very useful, particularly with blind threaded holes. A low speed reversible variable speed drill works well running back and forth through.

Cheers Phil

[Alex van de Wetering]

Hanno,

Just like you I also have to look for a set of taps and dies for the CMP; I know some good quality ones do pop up on marktplaats.nl every once in a while; although usually not as a set, but as separate items, so you might have to keep and eye out to gather a whole set.
I have also seen good quality USED ones at the yearly KTR fair in Breda and at Baco in IJmuiden (only the smaller sizes though).

Alex