Bolts

Somebody is asking for the top speed (bolt) of a WWII era light armor tank, the M22 Locust. The entire marginal advantage of these little guys were that they small and light enough that they could fit in a glider. Light armor could now be deployed behind enemy lines. That is if a glider could locate a suitable landing site, at night, before loosing too much elevation.

If you prefer the mundane answer, this could be a fairly large metric bolt.

Maybe this is the fastest recorded speed found on a Michigan Highway?

Others have told you what it means. I'd just add that M22 is a non-preferred size. If possible I'd go for M24 x 3mm pitch.

Yeah, but it's certainly preferred if you have a tapped m22 hole to go into

Del

That's why I said if possible. There's a few reasons why it might not be possible in OP's case.

Yeah, I get got that hence the emoticons....

DN 22

This is clearly only a partial quote. The complete quote would have been "Bolt in an M22". This is in reference to using the heavy duty 4 speed transmission GM used in some high performance Chevrolets. It had the same first gear ratio (2.20:1) as the standard M21 transmission, but had less of a helical cut to the gears, and was stronger and noisier.

The third member of the Muncie transmission trio was the M20. This was identical in appearances to the M22/21, but had a 2.52:1 first gear ratio. There may have been some 3.08:1 first gear versions of this design used in Pontiacs, but specifics are not available to me. I hope this clears this up. Bob.