kmmcrafts Posted June 2, 2018 Report Share Posted June 2, 2018 I have a friend trying to figure out what size bit he needs to fit a clock insert.. The mounting diameter is 55mm but Im not sure what that = in inch or what size bit he needs.. Thanks for anyone that can help.. I only deal with the small 1-7/16 clocks for the most part.. Quote Link to comment Share on other sites More sharing options...
Karl S Posted June 2, 2018 Report Share Posted June 2, 2018 Here's a conversion Chart. https://www.metric-conversions.org/length/millimeters-to-inches-table.htm Phantom Scroller 1 Quote Link to comment Share on other sites More sharing options...
OCtoolguy Posted June 2, 2018 Report Share Posted June 2, 2018 (edited) 5 hours ago, kmmcrafts said: I have a friend trying to figure out what size bit he needs to fit a clock insert.. The mounting diameter is 55mm but Im not sure what that = in inch or what size bit he needs.. Thanks for anyone that can help.. I only deal with the small 1-7/16 clocks for the most part.. Sorry, I hit the wrong key. It should have said 25.4 not 26.4. 1" = 25.4 mm. 55mm divided by 25.4 = 2.17. So, he will have to enlarge a 2" hole saw hole a wee bit. Edited June 2, 2018 by octoolguy Quote Link to comment Share on other sites More sharing options...
kmmcrafts Posted June 2, 2018 Author Report Share Posted June 2, 2018 Thanks guys, I don't know why he said he's having a hard time finding a bit.. I did a google after I asked here and found several sites selling 55mm bits.. including grizzly.. LOL OCtoolguy 1 Quote Link to comment Share on other sites More sharing options...
WayneMahler Posted June 2, 2018 Report Share Posted June 2, 2018 55 mm equals 2 11/64 inches . Here a place to calculate these types of measurements too. https://www.rapidtables.com/convert/length/mm-to-inch.html OCtoolguy 1 Quote Link to comment Share on other sites More sharing options...
Karl S Posted June 2, 2018 Report Share Posted June 2, 2018 25.4Mmm = 1" do the math . OCtoolguy 1 Quote Link to comment Share on other sites More sharing options...
Rockytime Posted June 2, 2018 Report Share Posted June 2, 2018 55mm = 2.165354" OCtoolguy 1 Quote Link to comment Share on other sites More sharing options...
JTTHECLOCKMAN Posted June 3, 2018 Report Share Posted June 3, 2018 If it is a 60mm insert it fits in a 55mm hole or 2-1/8" If it is a 55mm insert then it fits in a 50mm hole or 2" hole kmmcrafts and OCtoolguy 1 1 Quote Link to comment Share on other sites More sharing options...
kmmcrafts Posted June 3, 2018 Author Report Share Posted June 3, 2018 13 hours ago, JTTHECLOCKMAN said: If it is a 60mm insert it fits in a 55mm hole or 2-1/8" If it is a 55mm insert then it fits in a 50mm hole or 2" hole Thank you JT Quote Link to comment Share on other sites More sharing options...
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