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Old 11-08-2017, 07:43 AM   #1 (permalink)
 
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Default Drill Bits Sizes

Hello Everyone
I have a question about drill bits
if you have a 27/64 drill bit what would be the equivalent or the same size in mm's
I guess I'm going to have invest in a good pair of calipers
thanks
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Old 11-08-2017, 07:49 AM   #2 (permalink)
 
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Quote:
Originally Posted by BillyBoy63 View Post
Hello Everyone

I have a question about drill bits

if you have a 27/64 drill bit what would be the equivalent or the same size in mm's

I guess I'm going to have invest in a good pair of calipers

thanks

BillyBoy63






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Old 11-08-2017, 07:51 AM   #3 (permalink)
 
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10.7156 mm
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Old 11-08-2017, 08:03 AM   #4 (permalink)
 
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There is a very useful (and free) iPhone app that can be used here - iEngineer.
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Old 11-08-2017, 08:41 AM   #5 (permalink)
 
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If you go to the Starrett website, you can order free literature, too. I got a set of pocket cards showing the equivalents, and a giant wall poster from them. Very handy to have.
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Old 11-08-2017, 09:13 AM   #6 (permalink)
 
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The Library has a few charts with fractional, decimal, and letter bit conversions.

Here's a link to one of them: Drill Reference Chart.

Handy to print, laminate, and keep by your favorite drilling machine.
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Old 11-08-2017, 10:08 AM   #7 (permalink)
 
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Works for me.

Les
Attached Files
File Type: pdf Dril Bit Size Chart.pdf (84.9 KB, 38 views)
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Old 11-08-2017, 11:06 AM   #8 (permalink)
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IF you are mathematically inclined, 27/64 converts to .421875. that is the equivalent in decimal. Multiply that by 25.4 (mm in an inch) and you get 10.715625 mm.

While this is not as easy as reading a chart, I often don't HAVE the chart, but my phone does have a calculator.

FWIW,
Ed
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Old 11-08-2017, 11:27 AM   #9 (permalink)
 
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Alternately this might help get you where you want to be.

http://content.penturners.org/librar...ternatives.pdf
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Old 11-08-2017, 08:03 PM   #10 (permalink)
 
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or this FRACTION TO DECIMAL AND MM TABLE
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