Posted by Mike Poole on 10/11/2018 23:56:34:
I think picking the right spanner for a metric fastner is made more difficult because it is not hard and fast which hex size is used on a fastner. Cars and bikes seem to use smaller heads than the standard engineering spec but not consistently, its all done to confuse I am sure.
Mike
I always had Japanese bikes and German cars, and they make Whitworth, BSF and BS seem so simple by comparison (except perhaps my mate's BSA which needed both BS and AF tools). In my limited knowledge M12 is the worst offender with 5 different AF sizes; JIS is 17mm, ANSI and ISO are 18mm, DIN is 19mm and both ISO and DIN standards also allow heavy nuts of 21 and 22 mm respectively.
On the same subject, what are 6, 9, 20 and 23mm spanners and sockets intended for? I get the impression they are just there to make sets seem complete, or to go on the opposite end of useful spanners to make you buy more.
Brian
EDIT: As far as the original subject is concerned, why not buy a cheaper combined set and just put the sockets on a rail? They will take up much less room in a toolkit than a boxed set, which is mostly air.
Edited By Brian G on 11/11/2018 09:28:37