Need help on metric socket size

[bdog]

I am working on a Japanese piece of heavy equipment. All the fasteners are metric. I have some bolts I need to remove that are very tight and I am going to have to hit them with the 1” impact.

I have limited metric tools in larger sizes. A 1-3/4” wrench won’t fit, I don’t have a 1-13/16” to try, a 1-7/8” fits and feels fairly tight but with a four foot cheater it starts trying to round the nut.

I need to buy a 1” drive socket in the morning. I am tempted to try a 1-13/16” it I know it is metric I just haven’t a clue what size to try.

 

[Cruzan80]

Well when converting, 1 13/16 works out to almost exactly 46mm. A 1 7/8 is 47.625mm. So when you say it is tight-ish on the 1 7/8, is it less than a mm tight, or more like 1.5mm tight?

Sorry, dont know if 46 and/or 47mm are a standard head size, just did some quick math.

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[The Cobbler]

can you measure the head size?

 

[belvedere]

Maybe 46 or 47? 1-13/16" is equal to 46.04, while 1-7/8" is 47.63.

 

[davethorik]

I am working on a Japanese piece of heavy equipment. All the fasteners are metric. I have some bolts I need to remove that are very tight and I am going to have to hit them with the 1” impact.

I have limited metric tools in larger sizes. A 1-3/4” wrench won’t fit, I don’t have a 1-13/16” to try, a 1-7/8” fits and feels fairly tight but with a four foot cheater it starts trying to round the nut.

I need to buy a 1” drive socket in the morning. I am tempted to try a 1-13/16” it I know it is metric I just haven’t a clue what size to try.

A simple google search will turn up the formula for converting metric to inch, and vice versa.

 

[M6erfan]

Calipers?

 

[Samuel D]

Almost certainly 46 mm. ISO sizes go 41, 46, 50 mm.

 

[WittHay]

M30 bolts are 46mm. Actually have a 46mm 3/4" drive impact socket

1 1/8" bolts/nuts are usually 1 11/16" socket size and 1 1/4" thread size is 1 7/8" socket

 

[timgunn1962]

The standard Metric sizes are
M4 7mm
M5 8mm
M6 10mm
M8 13mm
M10 17mm
M12 19mm
M16 24mm
M20 30mm
M24 36mm
M27 41mm
M30 46mm

These are the common preferred sizes for off-the-shelf fasteners. Obviously there are other head sizes used in many automotive applications and the like. There are also other thread sizes which are less common.

Caveat: these are apparently the DIN standard sizes (Deutsche Institut fur Normen: German Industrial Standards) and effectively the standard in Europe. The ISO standard heads are smaller on the M10 and M12, at 16mm and 18mm respectively.

 

[steveo3002]

The standard Metric sizes are
M4 7mm
M5 8mm
M6 10mm
M8 13mm
M10 17mm
M12 19mm
M16 24mm
M20 30mm
M24 36mm
M27 41mm
M30 46mm

These are the common preferred sizes for off-the-shelf fasteners. Obviously there are other head sizes used in many automotive applications and the like. There are also other thread sizes which are less common.

Caveat: these are apparently the DIN standard sizes (Deutsche Institut fur Normen: German Industrial Standards) and effectively the standard in Europe. The ISO standard heads are smaller on the M10 and M12, at 16mm and 18mm respectively.

dont our freinds from japan prefer 12mm/14mm heads?

be easier to just ask...anyone got a *** car , what size is the bolt on the xyz

 

[cvairwerks]

dont our freinds from japan prefer 12mm/14mm heads?

be easier to just ask...anyone got a *** car , what size is the bolt on the xyz

OP’s not working on a car, some kind of heavy equipment...

 

[Samuel D]

A fair degree of play is fine with Flank Drive-style sockets.

That’s the great merit of the design: it increases the contact area greatly (after elastic distortion of tool and fastener) at the expense of a slightly worse contact location (the flanks of the fastener, even near the corners, are at a smaller radius than the corners).

I have some Wera Hex-Plus Allen keys that do the same trick in reverse. They have a slacker fit than many other Allen keys but can take more torque without plastically (permanently) deforming the fastener.

 

[Dave455]

Folks, there are many different metric standards, not just one.

The common ones are ISO (theoretically International, but most commonly used in the U.K) DIN, (German, supposedly being replaced by ISO, but don’t hold your breath) ANSI (American), and JIS (Japanese)

If it’s Japanese equipment then it will be a JIS size, so, the ISO and DIN sizes quoted are correct, but not relevant.

I don’t have a table of JIS sizes that large, but I do notice that my Koken catalogue lists both 46 AND 47 mm sockets, so I’m thinking it could be either.

Only way to proceed, especially if spending serious $$$ on an inch drive socket, is to measure it!

 

[DFB]

Most likely 46mm

 

[alfazer]

I live in metric land and do encounter 46mm from time to time. The most regular encounter is the single rear wheel nut on my 2013 Triumph motorcycle.

I've never seen a 47mm.

 

[Wyoming09]

There's no such thing as 47mm. After 46mm, it goes up incrementally by 5mm, so 50/55/60/65, etc.

https://www.grainger.com/category/t...!3!431903802178!b!!g!!&cm_mmc=PPC:+Google+PPC

 

[cherrybomb]

I would venture to say 46mm.Any time Iam in doubt of a size,I get out my digital caliper,I can put it in metric mode,read the size,flip over to S.A.E.read the size. I also have a large chart with all the equivalents on the wall.Hope this helps.

 

[dnschmidt]

Don't they make cheap digital calipers where you live? Why guess?

 

[RTM]

The hack way out, can you jam something stout between the nut and socket to close the gap? Chunks of feeler gauge, Allen wrenches, etc to make it fit. Not sure what would best close the gap and withstand the impact.

I’ve used two small Allen wrenches to replace an unavailable oddball large one in the past, but never with sockets or impacts.

 

[DFB]

Using a 1 7/8 is about 1/16" or 1.629mm over sized for a 46mm

I used a 1 3/4" on a 43MM axle nut before (1.45mm oversized) ya felt loose but did the job really with no ill effects

 

[Dave455]

There's no such thing as 47mm. After 46mm, it goes up incrementally by 5mm, so 50/55/60/65, etc.

There may not be in some standards, but there obviously is in at least one.

Here’s an extract from the Koken catalogue showing a 47mm socket!

 

[measuredtwice]

OP, can you measure it? If you can't reach it with a caliper or ruler, use the ruler to draw 46 and 47mm marks on a scrap of paper and tape the paper to your socket extension.

 

[driz]

I would venture to say 46mm.Any time Iam in doubt of a size,I get out my digital caliper,I can put it in metric mode,read the size,flip over to S.A.E.read the size. I also have a large chart with all the equivalents on the wall.Hope this helps.

Yep, hardly a day goes by I don’t whip my trusty $10 ( on sale) HF electronic caliper. I just can’t say enough good things about that little gem.
T anyone looking for one be aware they sell 2 styles. One doesn’t button through fractional, metric and thousandths. The Gray one with 3 gray buttons is the one to get. I’m always setting mine on whatever bolt ect . Then carefully sliding it back and forth till it lands on the closest size that makes sense. Great for sizing drills, holes, sheet metal thickness ect.... and still cheap enough not to cry if it gets dropped.


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[Junkdrawer Dog]

I used one similar to this at work. Approximately $10, light enough to carry in shirt pocket. Not meant for precision work but plenty accurate enough to size nuts, bolts, holes, etc.. Works up to 75mm/3inch, inside and outside.

 

[bdog]

Thanks guys. I don't have digital calipers but will buy some. It is kind of a long story but where we are working is about an hour round trip drive to the store that will have sockets this big, or the calipers for that matter. It is hard for us to break away during the hours they are open right now as we are slammed trying to get everything ready for a job next week. I bet it is a 46 mm. We got side tracked on another project today and didn't even get a chance to mess with it.

 

[619DioFan]

You don't need a caliper. all you need is a tape measure and then convert what it says to mm.

 

[Rabid Badger]

1 inch is precisely 25.4 millimeters.

1-13/16 x 25.4 = 46.0375 millimeters.

Buy a 46mm socket.