Was doing transmission fluid today and the drain and fill plugs were 23mm...what the hell? Almost every set short of like the "master" sets out there have just 22mm and 24mm. I have a ton of different socket sets and not one of them had it. Has anyone else ever needed 23mm for anything else?
23mm socket, really?
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mrobins297aaa
Well-known member
the manual trans on my 2002 kia rio I think has a 23mm drain plug if i remember right.
when I changed out the motor about 4 years ago I remember not having a socket to fit that drain plug..........can't say for sure it was 23mm but i have all the standard sockets (22 and 24) i remember stairing at it and saying wtf because i didn't have one to fit it.
when I changed out the motor about 4 years ago I remember not having a socket to fit that drain plug..........can't say for sure it was 23mm but i have all the standard sockets (22 and 24) i remember stairing at it and saying wtf because i didn't have one to fit it.
greasemonkey44
Well-known member
i use a 23mm on swollen dodge 22mm lug nuts
e30bradley
Well-known member
I use 23 all the time.. The drain plug and rear axle on my bike are both 23mm
therealwormey
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i think a 15/16 will work . seems like ive done that before i aquired a 23. i know a 7/8 works well on a 22mm on the axle nuts on jap bikes. seems like thats where i used a 15/16 was on a jap bike or maybe a v-rod
Some car companies do this so people at home don't fool with their cars. When working on a Volvo's suspension, the struts are held together in part with a 4 pronged star nut. Not sure exactly what the engineers were thinking but thoughts on the Volvo forums is that it was a last ditch effort to keep people from taking it apart on their own and hurting themselves.
It's possible they chose a 23mm so that people changing their oil wouldn't undo it accidentally, since like you said it's a rare size. Just a thought.
It's possible they chose a 23mm so that people changing their oil wouldn't undo it accidentally, since like you said it's a rare size. Just a thought.
cryan
Well-known member
You get odd number stuff like that on some German and Jap/Korean machinery. 24mm head is a M16 bolt. Most UK machinery is usually an even M number such as M10 M12 M16 etc so its all 17mm, 19mm, 22m, 24mm, 30mm and so on.
Provincial
Well-known member
Look for antique 29/32" sockets - they are almost a perfect match! 23mm = .9055 and 29/32 = .90625!
jeff g
Well-known member
Hi
Bluepoint Facom in 3/8 sd, Toptul 1/2 sd.
make them.
Bluepoint Facom in 3/8 sd, Toptul 1/2 sd.
make them.
needed a 23 capable of torquing the crank bolt on my supra to 247ft/lbs. it's in the "special" drawer. also, needed a 1 1/16 deep socket just to disassemble a vw oil filter.
still trying to find a good 11/16 that will fit into craftsman torque wrench handles....
still trying to find a good 11/16 that will fit into craftsman torque wrench handles....
Guns R Tools
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I think 90's Toyota dualie pickup's rear lug nuts were 23mm.
BDT/NWMN
Well-known member
23MM socket
Roses are Red
Violets are Blue
Most people don't need
Looks like you Do
Why that socket was skipped
Is anyone's guess
Would I like a full set
The answer is Yes
The set sells for less
With that socket not there
The lack makes a mess
As You pull out Your Hair
jjjrmx5
Well-known member
It's not quite that simple.
While bolts sizes, thread pitch / TPI and length are standardized, the size of the head can vary due to what is spec'd by the engineer or by what a fastener mfg. has in stock or sends to an assembler.
Hardness/grade and finish are also standardized but some bolts come with intergrated washers, are one time use stretch bolts are are even torque dependant with break away bodies so the head size really can vary.
I've disassembled vehicles and machinery where an M6 x 1.00 bolt may vary in head size by 1 or 2mm meaning you may need a 10mm wrench for one and a 12mm wrench for another. There is a bolt head range that each size fastener must fall into but they can and do vary. Both for metric and SAE.
You just can never assume.
BDT/NWMN , you just made my morning with your wicked poetry skills.
Last edited:
blackz26
Banned
Yet kobalt socket trays have the spot for them, and skips 26mm? 
ch:
ch:kiatech
Well-known member
KIA Uses it fit Trans and diff plugs
stonesfan68
Well-known member
Why that socket was skipped
Is anyone's guess
Would I like a full set
The answer is Yes
Awesome!
General Geoff
Well-known member
eh, I have two 23mm sockets, one chrome shallow 12 point from a Ko-Ken 4251M socket set and one deep wall impact six point from a Grey Pneumatic 1326MD set. Between the two I figure I'm covered for any 23mm needs.
Never considered that they were particularly rare.
Never considered that they were particularly rare.
JonDick13926
Well-known member
I haven't run into any 23mm fasteners yet, but with that said both the Proto 1/2" drive and the BluePoint 3/8" drive socket sets I have are complete from 10-24mm, including 23mm.
Are the trucks really cranky and emotional at the same time?
wingnut_1
Well-known member
2ndGearRubber
Well-known member
23mm.... you mean 15/16ths!
One of the few english sockets I use regularly.
One of the few english sockets I use regularly.
You are right that it is ciomplicated, but not right about some of the details above:
Engineers don't typically design bolts. In some industries, they are forbidden by law from doing so. We typically call out national stds. And different national or industry standards do differ from each other. Japan's stds differe from Germany's or the US std.
Engineers can design bolts. I have. Bolts are quite complicated to design and resulting bolts can be very expensive to purchase. Head size is based on the head's ability to react the tension in the shank of the bolt. So there is a mathematical relationship between head size and nominal diameter, but hardness/strength are not part of the equation since the head is made from the same material as the shank.
The std for M6 is 10mm. No national std allows 1mm variation. The bolt encountered may have come from a chinese product. The chinese routinely "shop make" hardware.
I looked at all the national stds and I don't recall that any country had tighter tolerances than any other.
23mm is not a std size head. It may be that one company or one industry uses this size to differentiate between a plug (which may require a different removal or treatment) from a structural bolt.
MikeF2316
Well-known member
I bought one for the same reason. I got a Craftsman to match the others. Sears shipped me 2, (and zero of a different size I ordered). I've not used either yet! Since then I've also purchased a complete set of impacts that include a 23 as well.
So send me your swollen Dodge lug nuts and your transmission pans, I'm prepared!
mailpup
Well-known member
Mazda RX-7 uses 23mm for oil line banjo bolts.
this... pretty much my only use for my 23mm impact sockets
23mm.... you mean 15/16ths!
One of the few english sockets I use regularly.
15/16ths is closer to 24mm
MikeF2316
Well-known member
We used a 23 mm wrench on a brake hose for a 1964? Peugeot 404.
gonmad54
Well-known member
I'm curious what kind of bike has a 23mm rear axle.
Seeing as its a drain plug it is quite likely that the thread is a pipe thread hence the odd size 23mm is very common on hydraulic lines on large machinery and plumbing fittings over here and my truck uses imperial and bsp threads on stuff like this with metric heads on them so some alsorts of sizes
I have used every socket from 6 to 24mm
I have used every socket from 6 to 24mm
shockwave
Well-known member
I had this issue changing fluid on s2000 it was either a 23mm or 26mm first time I ever used them odd but had old wrenches to cover and this is why I am more of a completists
PSYKO_Inc
Well-known member
I've got a Snap On 23mm 12 point that I've used for exactly one job (Saturn input shaft nut.) I bought it for that particular job, used it, and it's sat in the box ever since. But if I ever come across a 23mm fastener, I've got it covered.
dadsEH
Well-known member
Adjustable wrench and a BFH should do the job...