drill size

1. drill size

What size drill bit is need for a 18mm 1.5 tap (02 senor).

2.

3. http://www.korit.com/tapndrill.htm

Says 16.8mm drill...next smaller fractional would be 21/32, at about .050" smaller. That would work though.

4.

5. Originally Posted by STV_Keith
http://www.korit.com/tapndrill.htm

Says 16.8mm drill...next smaller fractional would be 21/32, at about .050" smaller. That would work though.
I think you mean .005" smaller. (.050 would be a lot to take out with a tap.)

6. No, the 21/32 is .050 smaller than the 16.8mm prescribed to drill with. It's the next smallest fractional size listed, and I'd imagine, easier to find than 16.8mm.

7. if that the case, 11/16 would work better because it's .03125 larger than 21/32 therefore making it only .01875 smaller

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8. i have to go with steel on this one.

16.8 mm = .661 inches
21/32 = .656 inches

difference = .005 inches.

James

9. 75% thread engagemant would be a 0.6511" hole. Use a 21/64 drill (0.6562")

To get wizzy the spec for a class 6H is:
minor diameter should be 0.6447" ~ 0.6565" <- 0.6506" is what the hole really should be
pitch dia 0.6703 ~ 0.6778"
major diameter 0.7087"
Flats on top of thread 0.0148"

10. Originally Posted by superdave013
75% thread engagemant would be a 0.6511" hole. Use a 21/64 drill (0.6562")

To get wizzy the spec for a class 6H is:
minor diameter should be 0.6447" ~ 0.6565"
pitch dia 0.6703 ~ 0.6778"
major diameter 0.7087"
Flats on top of thread 0.0148"

you win.

11. Originally Posted by superdave013
75% thread engagemant would be a 0.6511" hole. Use a 21/64 drill (0.6562")

To get wizzy the spec for a class 6H is:
minor diameter should be 0.6447" ~ 0.6565" <- 0.6506" is what the hole really should be
pitch dia 0.6703 ~ 0.6778"
major diameter 0.7087"
Flats on top of thread 0.0148"
21/64 drill, eh?

12. Easy enough formula is to subtract the thread pitch from the thread dia. and that's a good drill size. 18mm wiith a thread pitch of 1.5mm...18 -1.5 would be 16.5mm drill. (16.5mm=.6496...closer to the 75% than 16.8mm which = .6614)

13. Originally Posted by STV_Keith
http://www.korit.com/tapndrill.htm

Says 16.8mm drill...next smaller fractional would be 21/32, at about .050" smaller. That would work though.
Originally Posted by steelcomp
I think you mean .005" smaller. (.050 would be a lot to take out with a tap.)
Originally Posted by STV_Keith
No, the 21/32 is .050 smaller than the 16.8mm prescribed to drill with. It's the next smallest fractional size listed, and I'd imagine, easier to find than 16.8mm.
Originally Posted by gn7
if that's the case, 11/16 would work better because it's .03125 larger than 21/32 therefore making it only .01875 smaller
Guess this is one of those cases where zero really doesn't mean zero.
.50, .050, .005, are different, who da thunk it

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14. Originally Posted by steelcomp
Easy enough formula is to subtract the thread pitch from the thread dia. and that's a good drill size. 18mm wiith a thread pitch of 1.5mm...18 -1.5 would be 16.5mm drill. (16.5mm=.6496...closer to the 75% than 16.8mm which = .6614)
what about a class 3b fit? You know, like all the hose fittings in your boat should be.

15. You crazy kids all argueing about a tap drill size.

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