On 19/03/18 13:54, Dave Plowman (News) wrote:
<snip> > But do you have BA ones? ;-)
Of course - well 0-8, anyway, including all the odd numbers.
And I keep a 1/8 Whit (3/16 BSF) socket with them, because Sir Henry
insisted his 2 BA nuts and screws should have 0.338" A/F hexagons, not
the normal 0.324"
Which makes the set utterly useless for Japanese cars / bikes as
Japanese JIS 10mm bolts have 14mm heads.
JIS 4mm bolt 7mm head, same as Euro DIN, ISO/ANSI.
JIS 5mm bolt 8mm head, same as Euro DIN, ISO/ANSI.
JIS 6mm bolt 10mm head, same as Euro DIN, ISO/ANSI but many older
European cars used 11mm.
JIS 8mm bolt 12mm head, Euro DIN, ISO/ANSI 13mm.
JIS 10mm bolt 14mm head, Euro DIN 17mm, ISO/ANSI 16mm.
JIS 12mm bolt 17mm head, Euro DIN 19mm, ISO/ANSI 18mm.
JIS 14mm bolt 19mm head, Euro DIN 22mm, ISO/ANSI 21mm.
JIS 16mm bolt 22mm head, Euro DIN, ISO/ANSI 24mm.
The socket/wrench sizes you really don't need are 9mm, 15mm, 20mm, 23mm,
as they aren't part of ISO/ANSI/JIS/DIN standard.
Smaller head saves weight and material cost. Money goes on quality,
nearly all Japanese nuts/bolts are expensive forged flange head and
don't have washers. Even self tappers that go in plastic parts. Saves
time and cost on assembly line as they don't have to put the washer on
the bolt. Saves space, time and cost as they don't have to kit the line
out with boxes of washers. Don't have the pesky things running around
the floor when dropped, which also saves on time spent sweeping up.
Won't make a car full of rattling random dropped washers.
Japanese hex socket cap screws use washers and places where a spring
washer is used (like brake caliper to knuckle) they use regular bolts.
It's been well over 40 years and still the Euro/USA haven't caught
up/on. Too many bean counters saying flange head too expensive.
Cannot agree that 15 is not needed, many cars use 15, including Ford.
You need 16mm too, much of the clutch change I did last week on a
Renault Megane was 16mm (I cheated and used 5/8")
9mm comes up on brake bleed nipples.
The DIN standard is 19mm (extremely close and interchangeable with 3/4").
I've probably used an 18mm socket twice in recent years, but truly lost
count the number of times I have used a 19mm. Even then one occasion
might have been on a 11/16" bolt head.
The ISO standard for M10 is 16mm, whereas I don't recall ever using this
size in favour of the 17mm DIN standard.
Not my experience.
Yet I have used a 15mm quite a few times, wheel spindle bolts on a bike
12mm isn't a DIN or ISO size, yet common on Japanese vehicles.
IMHO, you can never be sure. Depending on the market the tools are aimed
for and where they are made.
A recent set of (lowish price) combination spanners from Lidl had all the
sizes from 6 - 21mm, except 20 mm.
*I pretend to work. - they pretend to pay me.
Dave Plowman firstname.lastname@example.org London SW
Why do sets of Allen keys not have a 7mm? Needed for old Escort front
I (and probably many others) have an Elora socket set, acquired with
Embassy coupons in 1965 or so. BSF, Whit, etc. The container eventually
succumbed to tin worm, so they're now in a fancy plastic case along with
all the metric sockets, adapters, torque wrenches and so forth.I think
there are some BA spanners hidden somewhere in the garage.
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