[SEL] spark plug tap drill size

[Fuller & Johnson]

It's 16.8mm tap drill for 18mm sparkplug thread.  Decimal is .6614.  21/32 is .005 undersize but will work fine.


Bill Boyce <bboyce at swat.coop> wrote:
hello all,,,
can someone give me the tap drill size for an 18mm spark plug tap,,,, i know i wont have a metric drill that large, so what would be closest inch size drill ?
thanks in advance,,
bill boyce
lost prairie,arkansas
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