I suspect that the reason for the difference in terminology is that the tools were originally intended to be used slightly differently. In America, the tool was primarily intended to break a fastener loose, before switching to a ratchet, speed brace, or whatever.
In the U.K. these bars were originally a more of a multi purpose tool. You could use it to loosen a fastener, but then you could swivel it round, put a tommy bar through it, and wind the fastener off.
Hi Dave,
This isn't correct.
Being immersed in research and catalogs naturally leads to adopting period correct terminology in forums, which can raise eyebrows, elicit questions, (and even accusations of affectation!) when discussing antique and vintage tools with those who are, er, um, let's just say, less immersed. Nothing causes it more commonly than using the historically correct terms for a "breaker bar", a term I have come to be cantankerous about for the implicit limitation in its utility, as you have alluded to (are they only used to break loose stuck nuts and bolts? are they never used to turn off non-rusty, well-maintained nuts and bolts that have been tightened to their correct torque reading? are they never used to turn nuts and bolts on? etc), but one that is now hopelessly synonymous with the tool on this side of the pond.
But, it wasn't always that way. And it definitely wasn't originally that way between 1919 and, oh, say 1965.
As a realist, I realized this was going to be a losing, uphill battle without some '
splaining. So I have posted a version of my 'Notes' on the subject before.
It's instructive to first reflect that the tool didn't appear at once, but evolved from fixed Offset Handles, and Tee Handles, which were not exclusively used to bust loose stuck nuts and bolts, and that most of the earliest and later vintage examples included cross-drilled holes for a cross-bar, for spinning.
In fact, Blackhawk called it a "Hinged Offset Handle". Bonney and Plomb called it a "Hinge Handle". Cornwell, New Britain, and Williams preferred "Flex Handle." Sears, Roebuck & Co (Craftsman) used a hybrid variation ("Flex T Handle"), as did Herbrand ("Flexible Offset Handle") and SK ("Flex Head Handle"). There were some notably unique oddballs: Duro preferred "Swing Head Handle", Snap-on liked "Nut Spinner Handle", and Thorsen got cute with "Linkjoint Handle."
As far as I have been able to determine, the term "Breaker Bar" wasn't used here in the US - and that colloquially, in shops, etc, until the late 1960's. The earliest I can find it turning up as a technical term in any automotive technical literature is 1971 and that was not a catalog but a hot rod magazine, lending credence to the theory that it came off the street.
The most modern catalogs I have for the mfgr's I cited above are from the late 1950's but spot checks into Bonney, Herbrand, and Snap-on catalogs in the 1960's do not include the term "Breaker Bar." Consequently, I am not exactly sure when the term was adopted by American industry. But, I think we could consider Snap-on a pretty good yardstick of terminology evolution, and we happen to have an excellent resource of Snap-on catalogs at collectingsnapon.com. The last time Snap-on referred to this tool as a "Nut Spinner" in a catalog was 1973. The first time Snap-on referred to it as a "Breaker Bar" in a catalog was 1975.