Neil Baker

Why is GM/Chevrolet using metric screws on the C7. To change out the airfilter I needed a 7mm socket.
Just wondering!

mschuyler

Because cars are made using metric. When someone says the USA is the only non-metric country, they are wrong. The USA is bilingual in that regard. You can't even buy a measuring cup that does not have metric embossed on it. Ever been to a hospital lately? (I hope not.) They weigh you in metric. All cars, except really old ones, have a metric speedometer. What size is your engine? Is it 378 cubic inches? Well, yeah, but we call it 6.2 liters. And for the record, a liter is about a quart, if you need a quick approximate conversion. About the only thing we don't readily get is temperature. 20 degrees is cold in Fahrenheit, but hot in Celsius. But the fact is we're a stealth metric country.

Obe1 GS

I'm guessing you haven't performed your own maintenance for a while; my 1995 Z28 was mostly metric!

eboggs_jkvl

I've had two sets of sockets for many years now. Somewhere along 1983 GM started using metric stuff. My SAE sockets are of no use to me when I work on my car. All metric on you don't get anything done. Only socket is 3/4" that is 19mm might be interchangeable.

Elmer

ersatz928

13mm = 1/2 inch

Woodson

Because it is better.

Avanti

Where've you been...for the last, HOW MANY years, Mr. van Winkle???

MikeERWNC

Same reason Harley Davidson does...

Corvette has more foreign parts than domestic.

mschuyler

Uh, no. https://www.american.edu/kogod/resea...-autoindex.cfm

Boiler_81

It has nothing to do with where the parts are designed or produced. The OEMs set engineering standards. When I started work as an engineer at a tier one automotive supplier in the early 80s, engineering was a mixed bag of English and metric. This transitioned over to all metric pretty shortly after my start. It has been all metric for many years.

Mike Campbell

Actually I believe that the U.S. Congress officially adopted the metric system way back around 1866 but it took a while to actually be used. But then again Congress does do everything at "glacial speed" except spend money.

defaria

Some people take a long time to catch up... Edgumacate yourself...

BTW I've been thinking of taking a trip to Hwy 19.

MikeERWNC

That link seems wrong.
Go buy and OEM part from your Chevy dealership.
It will have a Made in Mexico or Made in China label on it.
The chart does not show either of these.
I am pretty sure GM is not making parts for the car and parts for replacement in two different locations. That would not cost effective.

Vegas1500

Use a 9/32 if it’s a big deal....

Aramis76

Because it's the future...

The imperial system is going away. It's a slow death, I wish it was expedited, but it's dying nonetheless.

mschuyler

Take it up with the University. Their criteria and methodology are listed on the site.

Vetteman Jack

Screws/nuts and bolts have been metric on the Vette for a long time.

Elk

Thanks. I always find these statistics interesting.

They can also be amusing. Some years ago there was a study demonstrating there are more U.S. parts and labor in a Honda Goldwing than a Harley. I have no idea if this remains true

TyBoo

So have I. Well, almost two sets - I never can find that 10mm.

jimmbbo

Interesting that the top 14 cars on that list are all sold by FOREIGN companies... Honda, Fiat/Chrysler and Mercedes...