Posted by Owen Aaland on June 25, 2015 at 21:40:01 from (216.47.32.140):
In Reply to: Why not metric ??? posted by da.bees on June 24, 2015 at 20:17:02:
There was a push to have the US all converted to metric by 1975. In the early 70s the speed limit signs had both mph and kph on them. Some even had the kph larger and on top. 10 years later very few of those signs remained as they were replaced through normal maintenance. Much of industry started to make the change in the early 70s. That is when you had cars and trucks with both metric and English fasteners.
Other than anti-friction bearings that have been metric forever, probably the first thing to appear in metric on US built IH tractors was the alternator mounting bolts. Delco Remy made that change in the mid 70s. The IH 5X88 tractors were designed and built as metric units. Parts that were used in older models were not changed so the engines and hitch cover are not metric but most of the rest of the tractor is.
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