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View Full Version : Impact Deep Socket Metric Sizes in Sets - Missing Increments in MM



Lionelgee
12th February 2021, 01:45 PM
Hello All,

Firstly, the range of Deep Impact hex or "six point" sockets I am about to describe represent brands such as Genius - Force and even some "Unnamed" brands. I am not writing about 200 dollar plus for sets of 8 sockets like "Snap-On".

To further set the parameters of the following paragraphs: to avoid rounding off the flats of nuts and bolts that I have never worked on before, I intend to do the initial loosening with hex or six point sockets. I do not use impact drivers on the first loosening of these nuts and bolts; I use a breaker bar or a standard ratchet bar.

In an effort to increase my range of smaller sized deep impact hex or "six point" sockets I have spent a long time online to find sets that actually transition from 8 mm upwards in 1 mm increments to 22 mm. Apparently, this is a rare phenomenon. I have found that a common theme for Deep Impact socket sets is to miss 9, 11, 15 and 20 mm. These four sizes in the Deep Impact have to bought individually.

If I wanted to extend the range of Deep Impact sizes up to 32 mm between my current sets that I can put my hands to, I would have to buy: 23, 25, 26, 28, and 29 mm sockets individually.

Have the tool manufacturers carried out extensive research which has informed them that some sizes are so uncommon that they do not need to stock them in their "Sets"?

Here is a "For Instance": I just bought a new set of sockets online after visiting a number of specialist trade tool stores - not hardware stores in town... The online sourced "Set" includes:

Length: 78mm (Size: 10,12,13,14,15,16,17,18,19,21,22,24,27,30,32mm)
Length: 38mm (Size: 8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,2 7,30,32mm)

Notice that the 8, 9, 11, 20, 23, 25, 26, 28 and 29 mm by 78 mm long (Deep) sockets are not included in the set.
Also, that on the "standard" 38 mm long sockets are missing the 25, 26, 28, 29 and 31 sockets.

I do have some other sets that make up some of these gaps. However, most of these sets that I currently own start at 12 mm and go upwards to 32. None of my other sets of impact deep hex sockets started below 12. Hence, my intention of getting a set that went down to 8 mm. Earlier as a stop-gap measure, I had to go out and buy a 10 mm deep impact hex socket. With the 10 mm socket I was able to undo the smaller crankshaft and power steering pump bolts on my 1993 Defender 110 with a 200 TDI. These were bolts I figured would just love my using 12 point sockets on. So I went out and bought the hex or 6 point socket.

Otherwise, I would have thought that a socket set "Deep" or otherwise, would start with a low range socket size and build in 1 mm increments upwards to their stated highest or widest socket set. For example, from 8 mm to 32 mm.

No, I am not about to dash off to the tool shops or buy these "missing" sized sockets online in a single order. I will wait until the need arises - if the need arises. Mostly, because the combined cost of buying these "missing" sizes individually is more than most "sets" are worth.

It has me quite a bit miffed to be honest!

Kind regards
Lionel

AK83
12th February 2021, 06:55 PM
You will probably find that many incremental metric sizes are not used, or so rare for many applications, not worth the effort.
Also, some metric sizes translate into AF sizes well too.

eg. is the 9mm, I doubt you will find a non worn or hacked up nut or bolt at 9mm.
11 is also fairly useless.
Maybe it could be secured to the fabled missing 10mm sockets so that there is less likelyhood for the 10mm to go AWOL. 11mm sockets is almost always the one you accidentally grab from the box instead of the 10mm(which is most likely not there anyhow!)

I used to think 18mm was also not worth having, but found a must have if you work on Euro cars too. For some reason they like to do things differently.

15mm is handy on a more modern LR. Can't recall all I've found, but definitely serpentine tensioner pulley nut.

Don't get caught up with fear of missing out due to your situation of missing increments, just concentrate on what you really need.

DazzaTD5
12th February 2021, 07:07 PM
As mentioned some sizes are simply not used in the automotive industry.

Any decent mechanic should know all this, but as I rarely work on anything but Land Rovers, Jeeps, I have forgotten most of it all [tonguewink]
Euro type vehicles use: 8, 10, 13, 16mm, 17mm, 21mm, 22mm
Jap use: 10, 12, etc etc

-----
Now I believe (but dont actually know) that aircraft use spanner sizes in between say normal metric sizes so the average mech cant work on them. So instead of a 12mm or 13mm they will use 12.5mm, 13.5mm. I have not researched this but my Dad apparently has a spanner set for aircraft somewhere in his shed.

DieselLSE
12th February 2021, 09:59 PM
Now I believe (but dont actually know) that aircraft use spanner sizes in between say normal metric sizes so the average mech cant work on them. So instead of a 12mm or 13mm they will use 12.5mm, 13.5mm. I have not researched this but my Dad apparently has a spanner set for aircraft somewhere in his shed.
Alfa Romeo use some half sizes, too.

ramblingboy42
13th February 2021, 07:32 AM
the reason the socket sets seem to miss sizes is because it is rare to find a hexagon head bolt or nut of those sizes.

I'm quite sure from my 45yrs as an engineering tradie that you will not use those sizes you seem to feel are missing from socket sets.

I have spanners and sockets that have never been used.

Save your money for something else.

A few months ago I gave my indy mechanic a bucket of assorted spanners, sockets and associated bits and his eyes lit up and I was happy to be rid of all the antiquated sizes and tooling.

Geedublya
15th February 2021, 12:25 PM
You will probably find that many incremental metric sizes are not used, or so rare for many applications, not worth the effort.
Also, some metric sizes translate into AF sizes well too.

eg. is the 9mm, I doubt you will find a non worn or hacked up nut or bolt at 9mm.
11 is also fairly useless.
Maybe it could be secured to the fabled missing 10mm sockets so that there is less likelyhood for the 10mm to go AWOL. 11mm sockets is almost always the one you accidentally grab from the box instead of the 10mm(which is most likely not there anyhow!)

I used to think 18mm was also not worth having, but found a must have if you work on Euro cars too. For some reason they like to do things differently.

15mm is handy on a more modern LR. Can't recall all I've found, but definitely serpentine tensioner pulley nut.

Don't get caught up with fear of missing out due to your situation of missing increments, just concentrate on what you really need.

11mm is used on a lot of motorcycle brake bleed nipples.

POD
17th February 2021, 02:37 PM
Years ago I bought a set of 1/4"drive sockets and it didn't include a 12mm, went from 11 to 13. Absolute joke. I made the rep throw one in. As for the others, I agree the missing sizes are mostly un-used or rarely used.

PerthDisco
17th February 2021, 02:41 PM
My 30 year old Sidchrome 1/2” drive set still has imperial sockets without a scratch on one of them. Never used once in my lifetime so far.

Lionelgee
17th February 2021, 03:22 PM
11mm is used on a lot of motorcycle brake bleed nipples.

Hello Geedublya,

When I resurrected a Yamaha DT250, a significant umber of years ago, the main tools were 10, 11, 12 and 13 mm sockets and spanners. With 8 mm sizes thrown into the equation to a lesser extent. Other larger sizes were used on the wheel bolts and the like. Photo - as per factory - accessed 17th February 2021 from, YAMAHA DT250 | Webike News (https://japan.webike.net/moto_news/motopedia/motorcycle_database/20160802-yamaha-dt250)

Kind regards
Lionel

ramblingboy42
17th February 2021, 03:31 PM
a 12 is a very lonely spanner.

in imperial it is neither 1/2 nor 7/16

I have a very shiny 12mm spanner in my metric spanner drawer , I cannot recall using it.

I bought a set of long series metric sockets recently ....couple of years ago actually .....to facilitate accessing my spare wheel in one of its configurations I have used. There is a 12mm socket in the set , again not used.

AK83
17th February 2021, 03:50 PM
I just fitted the new rotoflex kit(which included nuts and bolts) to my Tdi.
Old nuts-bolts had 19mm heads.
New bolts(still high tensile 10.9 bolts), had 19mm nuts but bolt heads 18mm!

Stupid Euro engineers!

Didn't have an 18mm spanner in my spanner roll(just had all the sensible sizes, both metric and imperial), but had an 18mm ratchet spanner from Kingchrome in the small kit I have which I originally thought .. "idiots .. 19mm would have been better"

Blknight.aus
17th February 2021, 06:52 PM
just buy the genius set, its what I've been using for years.

Geedublya
17th February 2021, 08:00 PM
Hello Geedublya,

When I resurrected a Yamaha DT250, a significant umber of years ago, the main tools were 10, 11, 12 and 13 mm sockets and spanners. With 8 mm sizes thrown into the equation to a lesser extent. Other larger sizes were used on the wheel bolts and the like. Photo - as per factory - accessed 17th February 2021 from, YAMAHA DT250 | Webike News (https://japan.webike.net/moto_news/motopedia/motorcycle_database/20160802-yamaha-dt250)

Kind regards
Lionel

Japanese bikes mainly use 12mm and Europeans use 13mm.

POD
17th February 2021, 09:29 PM
a 12 is a very lonely spanner.

in imperial it is neither 1/2 nor 7/16

I have a very shiny 12mm spanner in my metric spanner drawer , I cannot recall using it.

I bought a set of long series metric sockets recently ....couple of years ago actually .....to facilitate accessing my spare wheel in one of its configurations I have used. There is a 12mm socket in the set , again not used.

My first job was an apprentice mechanic in a Jap car dealership. 12mm was absolutely the most frequently used spanner / socket / whatever. Could have done my entire job with 8,10,12,17,19, 21 and 24mm spanners and a #2 philips screwdriver. I never used an 18mm tool until I did some industrial work years later. I've just pulled the engine out of my Jag (yep had to pull the engine to replace a blown coolant hose!) and I used virtually every metric size, there are 6mm bolts with 7,8,9,10 and 11mm heads on them. Not to mention all the internal and external torx thingamajigs.

DoubleChevron
23rd February 2021, 03:57 PM
168976

I spotted this 3/8ths set at total tools a couple of months back. Quite cheap for what seemed to be quite good quality. If i'd noticed it went 8, 9, 10, 11, ........ , 13, 14, ......., 16, 17, .........., 19

Damn ..... 12, 15 and 18 are quite common sizes! I've collected plenty of sockets over the years. But still find myself short ( eg: bloody rover .... 12 point 8mm 1/4" socket..... Now I have one though). Impact sockets are generally a pain too.

168977

I realised a few years back I needed to put them all in order to save hours ... and hours .... and hours of searching for stuff (at which point I'd find another .... everyone needs 3 42mm sockets after all [bighmmm] ).


168978

I own old Citroens, the types of sockets I used to find impossible to find were 35mm ... these days it so simple with ebay. But make yourself a lookup. 35mm sockets didn't exist ... but 1 3/8" were everywhere :)




168979

best thing you can do if you were born in a metric time like me.... label all the old meaningless fractional crap with a real measurement. Now if you have a slightly rounded 13mm nut for example. A quick look will find you can use 1/2" .... or find a slightly smaller size in AF to hammer on.

With spanners .... everyone needs one of the cheap ****ty chinese sets that has all the spanners. They are in this weeks special buys at alldi. I'll grab a set or two as soon as they arrive at the local store

XL Wrench and Spanner Set 25pc - ALDI Australia (https://www.aldi.com.au/en/special-buys/special-buys-sat-20-february/saturday-detail-wk7/ps/p/xl-wrench-and-spanner-set-25pc/)

seeya,
Shane L.