I need help converting a metric drill bit to a standard one!!!?
I need assistance converting a metric drill bit size to a standard one. The plans specify that I need to drill a 3.5mm hole, but I only have standard drill bits available. Could someone please help me determine the equivalent size in standard measurements? Thank you!
10 Answers
Nov 11, 2024
The inch equivalent of 3.5mm is 0.13779 (3.5/25.4), so 1/8 is smaller, 9/64 is bigger, #29 is smaller, #28 is bigger (but here we are talking about 2 or 3 thousands of an inch). There is a great chart at http://en.wikipedia.org/wiki/Drill_and_tap_size_ch… , it shows all types of designations in order.
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RE:
I need help converting a metric drill bit to a standard one!!!?
The plans call for me to drill a 3.5mm hole. I only have standard drill bits, so can someone please help me convert this.
It comes out between a #28 and #29 bit. If all you have are fractional bits then it is a couple thousandths smaller than a 9/64″
At the hardware store they will sell a small metal or plastic template with holes in it. Get one with Standard and metric equivalents.
You can simply take the metric number (3.5 mm) and divide it by 25.4 to get the decimal equivalent of .138″. Conversely, just multiply any decimal number times 25.4 to get the metric equivalent.
3.5 mm = .138″ About the only size fraction drill that comes close is 1/8″ which of course is .125″. Good Luck
And if you can find one a 9/16 is .141″
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