12-27-2012, 05:05 PM
This is the first I have heard of Serial Taps also Dave. They are used to make a progressive thread cutting. #1 is a rougher followed by #2 an intermediate, followed by #3 the finish cut.
"Billy G"
http://www.carbidenz.co.nz/store/index.p...ct_id=1950
"Billy G"
http://www.carbidenz.co.nz/store/index.p...ct_id=1950