E36 Pilot Hole Drill Bit Size for T-20 Sunroof Screws?

[HandsomeMike]

Deleted sunroof assembly on my track car. Need to drill holes in aluminum strips to hold panel in and in the thin roof channels for the screws to screw into.


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[circuit.heart]

If you buy a tap and bit set for whatever size the screws are, that would be the safest bet for machine-threaded screws.

If the T20's are sheetmetal screws, you don't have to care, just make a pinhole and make it slightly bigger till you can (very tightly, barely) send the screw home.

[HandsomeMike]

Thanks! It’s the OE screws that were already holding the panel into the cassette.


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[golgo13]

I just picked up some M4 or M5 hex button fasteners and re-used the OEM holes.