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Sheet metal scew pilot holes

Sheet metal scew pilot holes

Sheet metal scew pilot holes

(OP)
I am having trouble finding a chart for the pilot hole diameter for sheet metal screws.  These are not the self-tapping kind.  I have found some online-charts for the major-diameter of these screws, but not the shank diameter.  Anyone have any links?

Flores

RE: Sheet metal scew pilot holes

Isn't the max shank diameter defined by
the screw nomenclature i.e. 3/4 diameter
screws are .750 diameter max.?

RE: Sheet metal scew pilot holes

(OP)
No, a 3/4" screw is 3/4" nominal to the outside of the THREADS, not the shank.

Flores

RE: Sheet metal scew pilot holes

Here is the technical way I do it.  I hold up the screw and several different drill bits until I find one that is visibly close to the shank diameter.  Best to be a little under.  Then I go for it.

Maybe not smart but done.

StoneCold

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