12-14-2014, 04:50 PM
I guess these two high performance taps would qualify as "dumpster diving" results because they were given to me by my employer before being tossed. They were used in a tapping seminar for task specific taps in given materials.
Both are M8x1.25 6HX taps. The high spiral is one for blind holes in austenitic (300 series) stainless steels. The other is for "short chipping" carbon steels such as pre treated AISI 4140, 1045 and similar. Barely showing any signs of wear after doing about 64 holes each.
![[Image: DSC_0509-r_zpsd62be0a2.jpg]](http://img.photobucket.com/albums/v466/kenm10759/Dads%20shop/DSC_0509-r_zpsd62be0a2.jpg)
![[Image: DSC_0510-r_zpsf86334d7.jpg]](http://img.photobucket.com/albums/v466/kenm10759/Dads%20shop/DSC_0510-r_zpsf86334d7.jpg)
Note how the "short chipping" one is like a combination spiral point & spiral flute. Because the materials it's meant for do make short chips, the spiral point shape helps break chips while the 15º helix carries them out of the blind holes. The "Inox" tap curls up the stainless steel chips tight and the high spiral pushes them out of the hole. These would be over $50 each if I had to buy them, glad I didn't have to! I don't know if I'll ever need an M8 tap, though ready when I do!
Both are M8x1.25 6HX taps. The high spiral is one for blind holes in austenitic (300 series) stainless steels. The other is for "short chipping" carbon steels such as pre treated AISI 4140, 1045 and similar. Barely showing any signs of wear after doing about 64 holes each.
Note how the "short chipping" one is like a combination spiral point & spiral flute. Because the materials it's meant for do make short chips, the spiral point shape helps break chips while the 15º helix carries them out of the blind holes. The "Inox" tap curls up the stainless steel chips tight and the high spiral pushes them out of the hole. These would be over $50 each if I had to buy them, glad I didn't have to! I don't know if I'll ever need an M8 tap, though ready when I do!