English-unit parts that are international standard, there are a few ! Options

[ArtechnikA]

There are a few car parts that despite the widespread adoption of the Metric system remain sized in English units as international standards.

Think about it - A few of the known parts in the next post...

[ArtechnikA]

There are a few car parts that despite the widespread adoption of the Metric system remain sized in English units as international standards.

OK - for those of you playing at home, we have

1) Wheels (e.g. 15", 16" ...)
2) Brake caliper mounting bolt spacing (per the brake thread) - 3.0" and 3.5"
3) Brake master cylinder bore. Our "19mm" is really a 3/4" bore, and the other familiar sizes (17mm 20,5mm 23mm) are actually sized in 16's of an inch
4) Seat Belt mounting bolts. They are really 7/16-UNF (24 tpi). This is close to an 11mm 1,0 to about 3 decimal places so they're effectively interchangeable. But 7/16-24 they are.

[orange914]

Sort of OT, but for several years Chevy made their engines with bolts with metric heads and SAE threads. They were required to change to metric but hey didn't want to re-tool their engine building equipment so they just changed the bolt heads.

i worked in g.m. dealership in the late 80's and had to keep a FULL set of oddball metric and set of std. hard to locate bolts just for that!!! a 3.8 v-6 would come in for a long block we'd all hide, ya never knew what you were in for

G.M. = "gods mistake"

1) Wheels (e.g. 15", 16" ...)

remember in the early 80's the mustang gt's had a metric rim size between 14" & 15"? it was known as the "TRX" wheel. ONLY michelin produced a tire. i bought ALOT of used tires in those days! (IMG:style_emoticons/default/MDB2.gif)

mike