On Mon, 31 Oct 2011 20:45:29 -0400, micky
wrote:

On Mon, 31 Oct 2011 18:32:08 -0400, Doug Miller
wrote:

On 10/31/2011 4:56 PM, micky wrote:
I finally bought the trailer hitch for my Solara and it came with
M10 -1.25 x 30mm bolts. So how come I need to use the 17mm socket
on a 10mm bolt?

SAE bolts aren't this confused.

What, do you think that a 1/2" diameter SAE bolt has a head with flats
that are 1/2" across?

No, but I think it takes a 1/2" wrench.
Nope. Guess again. A 5/16 bolt uses a 1/2 inch wrench. A 3/8" bolt
takes a 9/16" wrench. A 7/16 bolt takes a 5/8" wrench, and a 1/2 inch
bolt takes an 11/16 inch wrench. 9/16 uses 3/4, just off the top of my
head.

The issue with METRIC is there are several "standards" Japanese (JAS?)
standard uses 10mm on 6mm bolts, 12mm on 8, and 14mm on 10 and 17mm on
10
American Metric uses 11mm on 6, 13mm on 8, 15mm on 10 and 18? on 10.

European stuff can be either, from what I remember.(ISO)

Bzzzzzzzt. Thanks for playing, though.