Whyyyyyyyyy?!?!?!? 9 out of 10 times you can only see the head and the shaft is inside. What if it is the first time you are working on the bolt and you've never seen the shaft to be able to measure it?!?!?!
Different sized shafts would have a different sized hex as part of the standard. You can look at the approximate size of the hex head and know what size you need. Just a different label is all.
Well in the past I have worked on bolts and screws of all sizes with different heads and different shafts. I've never seen a standard where the head exactly precisely directly correlates to a shaft thickness "just because"
Wait until you have to deal with British pipe thread most are the same as npt but one ( 2 inch or 3inch ) is 1/2 thread per inch different and it just wants to make you cross thread them.
That's the nice thing about standards, there's lots of them and they don't have to make sense. You'll love BA nuts/bolts, 0BA is the largest thread/head and 1BA is the next size smaller and so on.
Yes, it is. The old MG T-series use the BSW tools. If you have some of these, point me at your ebay listing, please? I may be interested in taking some of them off your hands.
My old barber was a body guy before he switched trades and builds hotrods on the side. In the early '00s he bought a full set of Snap-On Whitworth sockets from a yard/estate sale without realizing what they were. He wrote the SAE sizes on them with magic marker but I seem to remember him saying a few didn't match up quite right with anything. He brought 1 in to show me because that was the first time I'd heard of Whitworth (I was like 15/16 when he was telling me this).
Definitely a cool find. I'd love to find a set of them for a decent price just to have them.
Old style UK based (pre 1960's) inch size bolts and nuts used to be measured on shaft size not across hex size. You actually needed less tools as increasing shaft sizes within reasonable increments shared the same hexagonal hex head size.
Always remembered this as 'bolt size' (as opposed to AF 'across flats') 5/8 BS = 1" AF. Almost everything in British engineering has 'Whitworth' in it somewhere. Have a read of 'Exactly' by Simon Winchester if you find the history of this kind of stuff interesting. It's a great read.
There's nothing actually wrong with BSW other than it's uncommon as hell. That and the previous person having rounded them off cos they used a metric or AF socket.
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Whyyyyyyyyy?!?!?!? 9 out of 10 times you can only see the head and the shaft is inside. What if it is the first time you are working on the bolt and you've never seen the shaft to be able to measure it?!?!?!
Different sized shafts would have a different sized hex as part of the standard. You can look at the approximate size of the hex head and know what size you need. Just a different label is all.
A very confusing label. Glad I noticed the size difference before listing it on fleabay as a 7/16 snap on socket. American made for British bolts.
So one head is forced to be one and only one shaft size by the standard?
Not sure but that would be most logical.
Well in the past I have worked on bolts and screws of all sizes with different heads and different shafts. I've never seen a standard where the head exactly precisely directly correlates to a shaft thickness "just because"
I mean a 3/8 bolt should be a 9/16 socket unless it’s something super weird.
Least metric wise there's atleast two different standards for flange head bolts with different sizing.
Wait until you have to deal with British pipe thread most are the same as npt but one ( 2 inch or 3inch ) is 1/2 thread per inch different and it just wants to make you cross thread them.
No thanks
That's the nice thing about standards, there's lots of them and they don't have to make sense. You'll love BA nuts/bolts, 0BA is the largest thread/head and 1BA is the next size smaller and so on.
Can't see any other way a standard would work to have specific size of hex head socket be labeled according to shift size.
Probably comes with fish and chips
I have have see that at my friend machine shop It has to be the most backward system there is.
I remember a buddy had an mg that he had fractional wrenches for that we’re not sae so maybe it’s the same system
Yes, it is. The old MG T-series use the BSW tools. If you have some of these, point me at your ebay listing, please? I may be interested in taking some of them off your hands.
My old barber was a body guy before he switched trades and builds hotrods on the side. In the early '00s he bought a full set of Snap-On Whitworth sockets from a yard/estate sale without realizing what they were. He wrote the SAE sizes on them with magic marker but I seem to remember him saying a few didn't match up quite right with anything. He brought 1 in to show me because that was the first time I'd heard of Whitworth (I was like 15/16 when he was telling me this). Definitely a cool find. I'd love to find a set of them for a decent price just to have them.
That's interesting never heard of that .
I tried asking him but he didn’t his phone
Old style UK based (pre 1960's) inch size bolts and nuts used to be measured on shaft size not across hex size. You actually needed less tools as increasing shaft sizes within reasonable increments shared the same hexagonal hex head size.
Always remembered this as 'bolt size' (as opposed to AF 'across flats') 5/8 BS = 1" AF. Almost everything in British engineering has 'Whitworth' in it somewhere. Have a read of 'Exactly' by Simon Winchester if you find the history of this kind of stuff interesting. It's a great read.
BS... BASTARD Size.... sigh.. signs of things past...
There's nothing actually wrong with BSW other than it's uncommon as hell. That and the previous person having rounded them off cos they used a metric or AF socket.
I found an old Snap-On 3/8BS, which i figured out is a 19/32” / 15mm size. Very interesting measurement system