Full Version: Need a drill bit size for a tap
I have new zerk fittings for my Elephant poly bronze rear bushings. They have upgraded the size from M5 .8 threads to a M6 .75. They had issues with them sheering off....like me. What size drill do I use? Or should I just use my new HF tap in the existing threaded hole? I have a drill bit spec for a M6 1.00 thread of 13/64. Is that the same size for M6 .75? Tanks
6mm screw W/ .75 pitch =5.24mm drill or #4 is the closest US drill size for 75% thread in alum. brass & plastic
Does your tap set not have drill bit sizes stamped on them? They are kind of small to read, but the ones we have here are all stamped with specs.
Cool, 5.24 mm, or that table from texachusetts says 5.25mm. Don't know what a #4 is but 5.25mm=.20669 3/16=.186 on my calipers and 13/16=.217 on my calipers. So smaller is better in this case, but is this too small for my HF tap?
QUOTE(RJMII @ Jan 8 2011, 07:52 PM) 
Does your tap set not have drill bit sizes stamped on them? They are kind of small to read, but the ones we have here are all stamped with specs.
Just checked. They are labeled with size/pitch and freakin CHINA. My Crafsman set has a booklet with chart for appropriate drill bit size, but kit does not have tap I need and sears didn't either. I could order though. Thats why the Harbor Freight.
QUOTE(Krieger @ Jan 8 2011, 11:06 PM)
QUOTE(RJMII @ Jan 8 2011, 07:52 PM)
Does your tap set not have drill bit sizes stamped on them? They are kind of small to read, but the ones we have here are all stamped with specs.
Just checked. They are labeled with size/pitch and freakin CHINA. My Crafsman set has a booklet with chart for appropriate drill bit size, but kit does not have tap I need and sears didn't either. I could order though. Thats why the Harbor Freight.
It should be fine to use the smaller bit.
You are only tapping 1/8 inches deep, so it should be ok.
If it was 1/4 or more...you may have an issue.
Just go slow and feel it as you go, as soon as you feel it stop, turn it back a 1/4 turn to unload the tap and continue...back and forth.
Rich
QUOTE(Krieger @ Jan 8 2011, 09:01 PM)
Cool, 5.24 mm, or that table from texachusetts says 5.25mm. Don't know what a #4 is but 5.25mm=.20669 3/16=.186 on my calipers and 13/16=.217 on my calipers. So smaller is better in this case, but is this too small for my HF tap?
Sorry for the typo 5.25mm is correct
# 4 = .2090 bits come in fractions, letter, and number sizes
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