Craftsman Metric VV Combination Wrench Question

[L5vw]

Trying to put together a set of vv metric co.bination wrenches. Have noticed so.e have capital MM lettering and some have small mm.

 

[yatg]

Back when those wrenches were made, the US was just getting into using metric on cars and such. But not all companies got it right, so the "mm" wrenches are for standard metric, and the "MM" wrenches are for oversized US metric, about .25mm over.


Probably just different manufacturing plants or runs.

 

[Lesserstore]

Both were made between 1971-92 at Easco's Arkansas plant (signified by the second V). The lower case mm would be earlier but I'm unsure of the exact date.

 

[4xdog]

…The lower case mm would be earlier but I'm unsure of the exact date.

I’d have thought the capital-letter MM would have been earlier and the lower-case, SI-compliant mm would have been later as we in the got US more familiar with the metric system and its abbreviations

 

[Lesserstore]

I’d have thought the capital-letter MM would have been earlier and the lower-case, SI-compliant mm would have been later as we in the got US more familiar with the metric system and its abbreviations

I was looking through catalog images, and my later V^ wrenches, and you are right. Which makes the wrench second from the top confusing.
From c.1971-73 the lines on the right of the Craftsman name were longer. From '73-77 no lines at all, and then 1978 onwards the lines were shorter on the right.
So I thought, just by looking at this picture, that the MM was later because it shows up on the no line wrench.
This is going to be a "fun" rabbit hole I'm going to have to go down....

 

[milky2k]

Back when those wrenches were made, the US was just getting into using metric on cars and such. But not all companies got it right, so the "mm" wrenches are for standard metric, and the "MM" wrenches are for oversized US metric, about .25mm over.


Probably just different manufacturing plants or runs.

Is this for real? Back in the 90's I remember a time or two when I couldn't seem to find the right wrench on an old Ford. Neither metric nor SAE would fit properly. I had no idea, I thought it was just typical Ford quality

 

[yatg]

Is this for real?

pull my finger