PHULL
|
| posted on 31/7/06 at 08:38 AM |
|
|
Hole size rule of thumb for taping 1/2" UNF ?
Gday
Could someone help me with what size hole I should drill first and tap a 1/2" UNF thread.
If there is a rule of thumb to what size hole you should drill?
Thanks
|
|
|
|
|
MikeRJ
|
| posted on 31/7/06 at 08:47 AM |
|
|
Get yourself a "Zeus" book, it's cheap an invaluable for this type of information.
For a 1/2" UNF thread, a drill size of 29/64" is required, which is almost exactly 11.5mm.
|
|
|
mitch2b
|
| posted on 31/7/06 at 08:49 AM |
|
|
this should help
http://www.coastalfasteners.co.nz/tapping_size.htm
Mitch
|
|
|
nick205
|
| posted on 31/7/06 at 08:50 AM |
|
|
yup the man from Zeus he say 11.40mm drill size for 1/2" UNF.
Local tool or nut/bolt factors should be able to furnish you with a Zeus data book - a worthy addition to any tool box 
|
|
|
PHULL
|
| posted on 31/7/06 at 08:54 AM |
|
|
Fantastic
thats for your help
|
|
|
Confused but excited.
|
| posted on 31/7/06 at 06:25 PM |
|
|
quote:
Originally posted by MikeRJ
almost exactly 11.5mm.
Yep, that's close enough. 
Tell them about the bent treacle edges!
|
|
|
Peteff
|
| posted on 1/8/06 at 12:12 PM |
|
|
Hole size rule of thumb for taping 1/2" UNF ?
If your thumb fits in it's too big
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
|
|
|
rusty nuts
|
| posted on 1/8/06 at 05:12 PM |
|
|
If you haven't got any information to hand a usefull tip is to find a nut for the thread you need to cut and use the bigest drill bit that will
go through nut.
|
|
|
.jpg)
