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Metric Countersink's

Question asked by Brad Joseph on May 10, 2012
Latest reply on May 11, 2012 by Lenny Bucholz

We have begun using more and more metric hardware in our designs. On a handful of parts we have some flat head machine screws M3-M5. The issue we are having seems to the be that the M4 for example sits far below the top of the part. Granted we would like it done a bit to ensure that its flush or below the surface slightly. But the screws seem to be further below that. It looks like we dropped M4's into a countersunk hole for an M6.

 

Is the solidworks countersunk hole tables for metric countersunk holes correct? They seem much larger then they need to be. I'm using both the ANSI metric standard and the DIN standard to compare. Since McMaster is typically DIN standard parts. But they are essentially the same hole size. Can anyone clear this up? Or point me to a standard countersunk hole size chart for these screws?

 

Thanks.

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