skipdiver":de2z9qq1 said:
I do have a yankee style driver that isn't a Stanley and has a black plastic handle, which is totally seized up. I only have the one Stanley if i can find it and wasn't aware that they had different bits for different sizes, despite owning one for years. We used to get the bits from the store when i made caravans for a living, so i never actually bought any. Everyone must have had the same sized driver because i can't ever remember asking for a specific size from the store man. I'm going back to pre cordless drill times now, so my memory may be letting me down.
The ratchet style driver was an American invention in the late 1800's apparently but Stanley, with the Yankee range popularised it.
There were 3 sizes of shank for the bits which fitted the three different driver sizes. The drivers, in order of descending size were the 131 (big daddy)
the 130 (the one the vast majority of people had)
and a baby called the 133/135 for little screws.
the shank sizes were 8mm, 7 and 5.5m respectively but....
of course they were originally made with imperial sized bores in the driver so sometimes a new bit might need a bit of fettling with wet n dry if it doesn't quite fit.
The designation of A and B is simply to do with age. The older ones were
model number A and the newer ones
model number B. With the older ones having wooden handles and no triangle logo on the shaft. They were also made in various locations incl the US, here and ultimately in the Far East before production ended in 2007.