DIYbanter - View Single Post - Why do they skip sizes of metric combo wrenches?

Jeff Thies

On 11/5/2010 7:01 PM, wrote:
On Fri, 05 Nov 2010 19:32:22 GMT, Red
wrote:

Be it Sears, HF, HD, etc.

They often go 6,7,8,10,11,12...

Not always in larger sets. But like who would buy an SAE set of any size if
it ran from say 3/8 to 3/4 without a 9/16?
When's the last time you really needed a 9mm wrench? In the Ansi/ISO
standard there is only 7,8,10,13,16,18,21,24,and 30
The German (Predominantly) DIN standard has only
7,8,10,11,13,17,19,22,24,27, and 30mm
The Japanese (JIS) standard uses only 7,8,10,11,12,14,17,19,and 22.

Thanks for the size charts.

Someplace someone has slipped in a 15mm,

That 15 is curious as it is widely used in American cars. It happens to
be just the size/strength needed for a lot of tough jobs.

as it is included in some
metric tool sets - so why would you want a 9 mm wrench. It doesn't
even match up to a fractional size, falling between 3/32" and 23/64"

Which makes it doubly unlikely to ever be used.

Seems to me that where you see these useless sizes most often is in
almost useless socket sets, where for a very low price they entice the
customer with EVERYTHING.

Usually, just getting what you need is better than a lot of trash.

Jeff