Wamsutta
Well-known member
What you guys use your 9mm sockets for? 
The 9 Millimeter Socket
- Thread starter Wamsutta
- Start date
isb cornbinder
Well-known member
9 millimeter is the same a .250 inch.
Firebrick43
Well-known member
Umm, it’s .354” pretty far from a 1/4”
I have used 9mm mainly on brake caliper and some German CNC machinery, same with 7mm Allen keys
Skiff Builder
Well-known member
I thought 9mm was near a .380acp or .38spl or 357
Ricky Joe
Well-known member
They are used in the Sprinter vans by Dodge and Mercedes for the battery post connections and the floorboard access panels. Those are the only two things that I remember ever using it for, but I only worked on a few before I retired.
Bill Wright
Active member
- Joined
- Jan 22, 2017
- Messages
- 44
.380acp is 9mm short
jayemm
Well-known member
I think the caliper bleed screw was 9mm on my previous car.
I use 9mm sockets pretty often at work, for 8-32 nuts I believe. But in actuality it's 11/32 sockets that is the correct size which I do not have at work.
Other than that I’ve never used any of my 9mms that I have at home & don't think I've ever actually encountered a 9mm.
Other than that I’ve never used any of my 9mms that I have at home & don't think I've ever actually encountered a 9mm.
jayemm
Well-known member
BlakeTheCarGuy
ALLIANCE MEMBER
I’ve used mine a few times. Mainly on Isuzu and Suzuki. Also 11/32 is the same size which is the size for the side light nuts on my dad’s Freightliner. I think I’ve used 9 before on brake bleeders too.
Debcrow
Well-known member
Chevy Astro van AC compressor center clutch bolt. 9mm with left hand threads, POS.
toolenthusiast
Well-known member
- Joined
- Jan 21, 2017
- Messages
- 723
Oh, this thread again.
They’re on brake bleeders.
They’re on brake bleeders.
jimbothecricket
Well-known member
The rear derailleur on my mountain bike has a 9mm bolt to secure the cable
Sorry, I really hate to be that guy.....
.250" is 6.35mm
9mm is .354"
11/32" is .344"
I can tell 9mm is too big for 11/32" nuts but it's close enough & 8-32 fasteners are small so no worry of stripping the head/nut.
Just like 10mm is loose on 3/8" nuts (10-32) & 11mm is loose on 7/16" (1/4-20) but I use em anyway.
Uh oh, I can hear the socket police knocking on my door.
RTM
Well-known member
9mm socket application
I'm looking at the Din and Jis charts and 9mm hex just doesn't show up. What's 9mm? Rusted out 3/8?
www.garagejournal.com
9mm fasteners?
Bought some Gedore spanners on ebay, mixed styles, think they are old stock clearance. Anyway there is a 9mm ratchet spanner and am curious where you would find 9mm headed fasteners used as i can't recall ever seeing one!
www.garagejournal.com
I'm tired of 9mm tools
I have never used a 9mm tool. But my sets always come with one.anybody ever put them in another drawer so they are not always grabbing a 9 instead of a 10?
www.garagejournal.com
9mm sockets and wrenches. Had anyone ever used that size on anything?
I think 9mm is one size I have never cover across in any application. Anyone ever find a user for that lonely 9mm socket or wrench? Sent from my Nexus 6P using Tapatalk
www.garagejournal.com
I'm tired of 9mm tools
I have never used a 9mm tool. But my sets always come with one.anybody ever put them in another drawer so they are not always grabbing a 9 instead of a 10?
www.garagejournal.com
Etc etc etc
Search results for query: 9mm
www.garagejournal.com
I am always wondering how people remember what size sockets they use/don't use when I can't even remember what I had for breakfast today ? 
I kinda sometimes wonder if I have sockets in my set that I've never taken out of their slots in 20 years.I am always wondering how people remember what size sockets they use/don't use when I can't even remember what I had for breakfast today ?
isb cornbinder
Well-known member
I do not know the details. I did Google for some information and this got me in trouble.Sorry, I really hate to be that guy.....
.250" is 6.35mm
9mm is .354"
11/32" is .344"
I can tell 9mm is too big for 11/32" nuts but it's close enough & 8-32 fasteners are small so no worry of stripping the head/nut.
Just like 10mm is loose on 3/8" nuts (10-32) & 11mm is loose on 7/16" (1/4-20) but I use em anyway.
Uh oh, I can hear the socket police knocking on my door.
Be "that guy." It is important every now and then.
Stoopid Google again! Can't trust em!I do not know the details. I did Google for some information and this got me in trouble.
Be "that guy." It is important every now and then.
Forget Google, next time just use 25.4.
oldschoolcraft
Well-known member
I just want to say thank you to the OP for starting this thread. It seems like nobody wants to start a new thread anymore.
There has been many 9mm threads here over the years. Did we really need another one? Nope we don't, but whatever, doesn't bother me as it does others. And this won't be the last.I just want to say thank you to the OP for starting this thread. It seems like nobody wants to start a new thread anymore.
oldschoolcraft
Well-known member
Well for me, I've run Japanese cars my entire adult life, and I only recently realized JIS size standards are 8-10-12-14-17-19-22-24-27I am always wondering how people remember what size sockets they use/don't use when I can't even remember what I had for breakfast today ?
I'd watch youTube videos on how to do specific repair, takes detailed notes on the sizes of fasteners so I could bring the correct sockets and wrenches to a friend's house to do the repairs. Dont want to bring ALL of my stuff, I have too much.
And I realized that I could get away with just bringing 8-10-12-14 and so far I haven't done anything to my car outside of those four sizes. I just took the seat out and the seatbelt assembly off today, with a 14.
So if I ever ran into a fastener like 9mm or 11mm it would cause me to be really surprised, and I'd remember it.
To avoid the potential of getting screwed, I bought a Tekton 3/8" shallow socket full set 8mm to 19mm to keep in my car trunk 24/7. I have my nicer Snap On and Proto JIS specific tools that I bring with me as well. But I at least have the ability to run a shallow chrome socket on any other 9-11-13-15-16 size. If I had to go grab that socket strip from the trunk, it would be memorable for me.
oldschoolcraft
Well-known member
Maybe @Wamsutta should have titled it "The 9mm Socket (2024 Edition)" and each year we can have a new one that explores new trends in fastener designs.There has been many 9mm threads here over the years. Did we really need another one? No we don't, but whatever, doesn't bother me as it does others. And this won't be the last.
Old German vehicles used it. Had plenty of NSU motorcycles, some special fasteners in the engine (the Ultramax valve setup engines - Max, Supermax, Prinz, Maxi...) sometimes used a 9mm head. I think the cylinder head on the Maxi uses half-studs from the engine and half-studs from the head, and they are jointed in the centre of the cylinder. You reach in between the cooling fins with a 13 or 14mm wrench to tighten them down while preventing the special stud from spinning with a 9mm wrench. I think there's some stuff in the engine too. Very weird design. But at the time most didn't even use full size studs anyway. This setup allowed them to seal the top of the head easier, I guess. Also easier to mount the cam with all of that out of the way - after all, this was a time before CAD and an NSU Max engine is a work of beauty for a 50's design - OHC engine with a jointed gearbox, the NSU and Jawa 500 is what Honda copied later on after his European tour of the 50's (and the Supercub kind of copied the Guzzi Galetto, with a horizontal four stroke engine, leg shields and full size wheels and motorcycle handling on a scooter).
Ultramax camshaft drive is also ultra cool. Like a locomotive. No chain, no belt, no gears... No rattle. But assembly is hard and tolerances need to be tight. Probably more losses than a chain?
Ultramax camshaft drive is also ultra cool. Like a locomotive. No chain, no belt, no gears... No rattle. But assembly is hard and tolerances need to be tight. Probably more losses than a chain?
Honda motorcycle (smaller) engine rocker adjustment is a 9mm. Typically only requires a combo wrench, but sometimes is tight enough to warrant a socket to break it loose, before switching back to the closed end wrench and the square head specialty tool to turn it.
(file photo...never use a pair of pliers for this, lol)
(file photo...never use a pair of pliers for this, lol)
To be fair, taking the engine apart on those can be a daunting task. Or the whole bike. So many hard to access fasteners for a bike of that age. Not to mention the NSU Prima scooters. Sometimes I really wonder how scratched they came out of the factory cause I doubt all of the parts just fit together even when brand new. Modern restorations of vintage bikes often end up going further than the original quality...
Wrench97
Well-known member
Brake bleeders. Sprinter vans and what use to be 10mm after they rotted off a bit...........
Many years ago I wrapped my 1/4" 9mm socket with a piece of velcro (the soft fuzzy side) to make it easier to turn socket by hand. I remember using it often enough where that made sense but can't for the life of me recall what I used it for. Probably for the back of a stereo strap or something like that up behind a dashboard in a hard access point. The velcro is still on that socket to this day. It's the only socket I've ever wrapped like that.
KnurledNut
Well-known member
I have a Makita saw with a 9mm headed blade bolt.
Kscardsfan
Well-known member
Can always hammer it onto rusty, misshapen 10mm fasteners.
Chrome Vanadium Cody
Well-known member
- Joined
- Jul 25, 2021
- Messages
- 663
I used it a couple months ago servicing the chip conveyor belt on a lathe. It stuck in my head because it was the first time I'd ever used that size.
VolvoRyan
Well-known member
Brake bleeders on older European cars. For me, the 9mm is important enough to be "Snap-On or bust".
While we're on weird sizes, didja know there are metric hose clamps? Yup. 7mm or 6mm hex on the screw instead of the 1/4" for SAE hose clamps.
-Ryan
While we're on weird sizes, didja know there are metric hose clamps? Yup. 7mm or 6mm hex on the screw instead of the 1/4" for SAE hose clamps.
-Ryan
Chrome Vanadium Cody
Well-known member
- Joined
- Jul 25, 2021
- Messages
- 663
Yup, I have some of these 7mm ones on my moped. Always surprises people
whateg01
Well-known member
This is what happens when you rely on AI for your socket interchangeability information!I do not know the details. I did Google for some information and this got me in trouble.
Be "that guy." It is important every now and then.
VolvoRyan
Well-known member
It's surprising how much it matters, too. Thank goodness McMaster is accommodating.
-Ryan