On 21 Mar, 15:19, Bob Kuykendall wrote:
On Mar 20, 8:17*pm, Uncle Fuzzy wrote:

...My favorite example was an exhaust stud on a 1998 Olds
Intrigue. *Engine side - SAE exhaust flange side - metric.

SAE and metric threads on the same stud? Yup, that's odd all right.

My friendly local tool shop used to sell UNF/UNC nuts and bolts ...
with metric heads. Confused the hell out of me when I had to replace
some of them years later.

Ian