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Metric Hole Saws
Question
Forum Responses
Another thought… If you bent 4 of the teeth (separated by 90º) on the saw out by .5 mm, you could make your own 55mm hole saw. You could probably do it by using a small pair of vice grips, or a punch and a hammer. It should be kind of tough to do because the teeth are hardened.
From contributor J: What about the ole adjustable hole cutters? Cutting blade slides on a bar with the arbor for the chuck in the center on the bar? From the original questioner: Part of the problem with adjustable hole saws and others, for that matter, is that they don't stay sharp long in composite woods, like plywood or MDF core. Other than that, I will probably use a 2 1/8" hole saw and sand out the difference. From contributor F: If this is a one time need, I would use a fly cutter on the drill press. If you have anyone in the shop who can grind and hone, they are easy to sharpen. If you must go metric, try to Google a European tool source. From contributor P: Have you tried Sandvik? They make hole saws and some of the ones I use (in the UK) are marked only in metric. From contributor C: Why not use a 2 1/4 saw? Only 57 mm and the deco ring should be plenty to cover it. From the original questioner: Okay, here is the solution we found temporarily. We use a 2 1/8" hole saw, which is 54mm, and then use a small grinder in a drill chuck to open it up the extra millimeter. If you try to do it with a 2 1/4", it comes out too loose and will not friction fit in the way it was designed. Thanks for all the tips. From contributor A: We use a 54mm hole saw all the time for installing the 55mm lights from HERA. The hole comes out fine because there is at least 1mm of slop in the arbor of the drill + the saw diameter + the operator movement. We don't have to use any sandpaper or filing or whatever. From contributor R: www.mcmaster.com has metric hole saws. Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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