U-joint dimensions question

[Hugo Habicht]

Hello,

I did a bit of searching already but strangely enough could not find a definitive answer.

Am i right in the assumption that the size of a u-joint with internal clip rings is the inside width of the yoke and with u-joints with external clip rings the dimension is the overall width of u-joint?

Kind regards,
Hugo

 

[Dustball]

They're measured by cap diameter and the outside with of the installed caps.

Examples of the two kinds-

 

[Hugo Habicht]

They're measured by cap diameter and the outside with of the installed caps.

Hmmm... it seems every manufacturer does as they please. Measuring on the outside when having inside clips does not make a lot of sense to me because it does not matter it the outside is another 2 or 3mm wider. On the inside it would matter though. I found those for example:

Seems the same problems as with the studs, DIN standard clearly specifies that screwed in part is not part of the length measurement and yet a lot of dealers quote the full length.

Looks like a lot of potential ordering the wrong parts I think.

 

[TheOldHokie]

Hmmm... it seems every manufacturer does as they please. Measuring on the outside when having inside clips does not make a lot of sense to me because it does not matter it the outside is another 2 or 3mm wider. On the inside it would matter though. I found those for example:

View attachment 152367

Seems the same problems as with the studs, DIN standard clearly specifies that screwed in part is not part of the length measurement and yet a lot of dealers quote the full length.

Looks like a lot of potential ordering the wrong parts I think.

The measured dimension in both of the examples is snap ring groove to snap ring groove. In the first example the snap ring grooves are in the yoke. In the second they are in the caps.

Dan

 

[Hugo Habicht]

The measured dimension in both of the examples is snap ring groove to snap ring groove. In the first example the snap ring grooves are in the yoke. In the second they are in the caps.

Dan

No, it is not. In Dustballs first example there are inside clip rings shown, yet the dimensions are draw to the outside. That makes no sense.

What you say makes sense that always snap ring dimensions should be used.

 

[ruger1980]

The method of measuring should be to the point of retention, whether that be internal or external snap rings, bolted flanges or whatever. So internal snap rings measure to the inside of the yoke and external measure to the outside of the cap.
Just remember to take into consideration yokes sometimes get tweaked when removing the caps and cross.

 

[TheOldHokie]

No, it is not. In Dustballs first example there are inside clip rings shown, yet the dimensions are draw to the outside. That makes no sense.

What you say makes sense that always snap ring dimensions should be used.

Read what I said again. The measurements are to the snap ring grooves. In the first example that is the same as out to out on the caps.

Dan

 

[Dustball]

Hmmm... it seems every manufacturer does as they please. Measuring on the outside when having inside clips does not make a lot of sense to me because it does not matter it the outside is another 2 or 3mm wider. On the inside it would matter though. I found those for example:

I see what you mean. It looks like you're looking at the 44 series.

Here's how Weasler specs them-

I'm sure there's a global standard for the 44 series so that no matter how the manufacturer specs the width- it'll return the same part, just in different ways of arriving at it.

I found this which gives both inner and outer-

 

[Hugo Habicht]

Read what I said again. The measurements are to the snap ring grooves. In the first example that is the same as out to out on the caps.

I did read it correctly. But Dustballs first example clearly shows internal snap rings, yet the dimensions "B" are to the outside.

 

[Hugo Habicht]

I see what you mean. It looks like you're looking at the 44 series.

I only picked that as a random example. I need u-joints for the wheel drives of my G1900. Kubota wants over $100 for one which is out of question.

Your example showing both dimensions is actually a perfect way doing it.

 

[Dustball]

I only picked that as a random example. I need u-joints for the wheel drives of my G1900. Kubota wants over $100 for one which is out of question.

Your example showing both dimensions is actually a perfect way doing it.

This one?

 

[Hugo Habicht]

No, the ones in the rear wheels drive shafts.

Kubota number is 66111-46240 I believe.

I think I found one for a Nissan, that's why I asked the original question. I ordered a few of them ($7 each), with 25x44mm they should fit, 44mm could not be an outside dimension.

But thanks for the other language link, this is one I will have to replace too at some stage

 

[TheOldHokie]

I did read it correctly. But Dustballs first example clearly shows internal snap rings, yet the dimensions "B" are to the outside.

View attachment 152422

I missed that but my point is unchanged. The controllimg dimension is snap ring spacing in both cases.

Dan

 

[Hugo Habicht]

I missed that but my point is unchanged. The controllimg dimension is snap ring spacing in both cases.

Yes, that is correct and that makes sense. Trouble is a lot of vendors have outside dimensions for inside snap rings. That's what confused me.