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Tool Talk Discussion Forum

what is it with metric wrenches/sockets

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ric1

04-17-2007 18:09:16

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why is it one metric wrench set will have a certain wrench not there and another set will have a different wrench not in the set ive noticed this with metric socket sets also. for instance one set will be missing a 11mm and this set over here a different brand will have a 11mm but maybe not a 12mm is there a reason for this. thanks

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Slowpoke

04-26-2007 01:35:32

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

Lots of sets are missing the 16mm, because you can use a 5/8" wrench. 11mm is close to 7/16". Divide mm by 25.4 to get a close approximation.

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jeffcat

04-18-2007 20:53:18

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

Try digging into my 1996 Ford Explorer. When I bought it used last november in 2005 I had dust in the instrument cluster. My original metric set was stolen on a job sight and I went to the flea market where a guy has all kinds of stuff. He had the 1/4 socket holder strips and I picked through his big boxes of used sockets. For only $5.00 I now go from 4mm 4.5,5,5.5 ect. up to 15mm. Ford dash boards have 5.5,6,8,and9mm just to get the thing out!
You can never have enough sizes of sockets! Wait till you find out there are three thread sizes for 10mm bolts. Atleast this is what I found. I have also modified my stock speakers with Piezo tweeters so the high end frequencys are nice and crisp. Lots of work but great sound! Jeffcat

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Terry G

04-18-2007 09:33:51

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

And the 1 wrench that is not in the set will cost you about 80% of what the whole set cost.

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jdemaris

04-18-2007 05:10:24

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

Yes - metric sets get more imcomplete - you really have to look close when buying. When I first started buying metric tools - late 1960s - a metric wrench set not only came with ALL the whole sizes - it also came with many half-sizes - e.g. 14.5 MM, 15.5 MM, etc. I never see them anymore. Every have an odd-ball bolt-head that neither an SAE or Metric would fit just right? Sometimes one of those half-sizes work just right (no to be confused with Whitworth).

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Stan in Oly, WA

04-18-2007 02:47:09

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

Hi ric,

It seems ill-considered to me. Leaving out any size in the range because it's not widely used falls apart the first time you need that size. If I bought a set of sockets that was from let's say 6mm to 22mm and I needed a 5mm socket, I'd think, oh, it doesn't go that small. Or 23mm, oh it doesn't go that big. After all, it's not an infinite socket set. But when you need a size that's in the range you bought and it's not there, you feel like you're the victim of somebody's bad guess, like you've been cheated. I do, anyway.

All the best, Stan

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Rockyhawaii

04-17-2007 21:23:26

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

For the last fifteen years or so I've used Metwrinch sockets and wrenches and effectively solved that problem.

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old

04-17-2007 18:50:30

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

Has a lot to do with it being U.S. metric and japan metric. The U.S. metric use the odd sizes as in 11, 13, 15 etc and the Japan metric use 10, 12, 14, so ni=either set has all of them and it also depends on where its made if U.S. made it has the odd one and japan made toe others for the most part but both seem to blend them some

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IA Roy

04-17-2007 18:41:05

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

It depends if it is european metric, or Jap metric also.

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Jerry Coulter

04-17-2007 18:37:41

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

I find it"s nearly always the 18mm missing. That is the one which loosens the tension pulley on GM engines so you can replace the serpentine belt. It is a plot!!

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Dell (WA)

04-20-2007 07:51:22

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Re: what is it with metric wrenches/sockets in reply to Jerry Coulter, 04-17-2007 18:37:41

Jerry..... ..as a former BMW mechanic, I used to give "Snap-on" guy hazzle about selling 18mm sockets in their kits 'cuz there AIN'T NO 18mm bolt/nuts sizes in the European DIN system (DIN = SAE) ..... ..Dell

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KEH

04-18-2007 16:10:00

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Re: what is it with metric wrenches/sockets in reply to Jerry Coulter, 04-17-2007 18:37:41

I always wondered what 18 mm was used for.

KEH

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Bob

04-17-2007 18:36:46

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

It seems to me IMPORTED cars, for example, tend to use 11,12, and 14mm bolts and nuts, while American metric stuff commonly uses 13 and 15mm heads on it's fasteners in the same approximate size range..

Always wondered why.

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Easy1

04-17-2007 21:58:29

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Re: what is it with metric wrenches/sockets in reply to Bob, 04-17-2007 18:36:46

Because when the shift from english to metric fasteners started in the 70's, the design engineers simply speced out the same basic size - a 1/2 - 13 was replaced by a 12mm or a 13 or 14 mm. 3/8 became a 10 or 11 mm. A 5/16 became a 8mm and the 1/4 - 20 became a 6mm. There were some metric thread fasteners made with engish heads - but they died out pretty fast. That was done to avoid some tooling issues. Probably drove some mechanics crazy too.

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Wisconsin Cowman

04-17-2007 18:28:43

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

They do that because they give you the most common sizes used. Like they will take 11mm out and 19mm or sometimes 21mm cause the bolts or nuts are not common to use those sizes.

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IH2444

04-17-2007 18:24:35

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Re: what is it with metric wrenches/sockets in reply to ric1, 04-17-2007 18:09:16

Or 13/16 wrenches and sockets...

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