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Rolex case part numbers for pendant tube and crown ?

mikepilk
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mikepilk Distinguished Member

mikepilk

Posted
Posted

I just bought a 1963 ladies Rolex Tudor Oyster Royal, calibre (ETA) 1173, case reference 7935

The case is Rolex and needs a new screw-down pendant tube - the external threads are worn away.
Also, the crown  just spins and won't wind. I guess fixing these is impossible, so I'll need a new crown.

Of all things watch related, I know very little about screw down crowns and how to replace them = help 🥴

The pendant tube is screwed in, and smooth inside. So how do you remove them - just jam something in and turn?

Pendant tubes (and some crowns) seem to be generally available for Rolex, so I'm looking for a part numbers.
Can anyone help me with part numbers for pendant tube and crown for Rolex case 7935 ?

 

WIN_20241011_15_50_23_Pro.thumb.jpg.621044292c6c2b5ff8b5c7499cfd1508.jpg

 

WIN_20241011_15_58_52_Pro.thumb.jpg.91cc511d5cf8df2f78c5206d1c6722b4.jpg

 

 

RichardHarris123 Distinguished Member

RichardHarris123

Posted
Posted

I don't know but it seems strange that the inside is smooth, usually have splines. I would heat the case to break any threadlocker and gently try turning with long nose pliers but someone may give you better advice. 

mikepilk Distinguished Member

mikepilk

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  • Author
Posted
29 minutes ago, AndyGSi said:

Yes basically that's it but there specific tools.

https://www.cousinsuk.com/search?searchTerm=pendant tube tool

The first place I looked, but all the tools seem to be for tubes with an internal spline. I guess I could just ram one in and turn 🥴

30 minutes ago, AndyGSi said:

All the usual places don't show any details for the 7935.

Which is why I asked. I'm pretty good at finding tech sheets etc, but so far have been unable to find anything on Rolex case part numbers. (I tried " ROL CS#7935" on Jules Borel, but it only gave the crystal)

AndyGSi Distinguished Member

AndyGSi

Posted
Posted (edited)
16 minutes ago, mikepilk said:

The first place I looked, but all the tools seem to be for tubes with an internal spline. I guess I could just ram one in and turn 🥴

I've never worked on one with splines and that's what I've always done.

In the past I've even just used a torx bit.

Edit

What size is the tube & crown?

Edited by AndyGSi
mikepilk Distinguished Member

mikepilk

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  • Author
Posted
23 minutes ago, AndyGSi said:

What size is the tube & crown?

The tube external thread is about 3.8mm, not easy to measure as the thread is nearly gone. The inner thread is about 2.25mm - I'll measure it properly when I get it out. The crown is 5.2mm. It's original Rolex with crown, so would be a shame to have to use a generic

mikepilk Distinguished Member

mikepilk

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Posted
14 hours ago, AndyGSi said:

I've never worked on one with splines and that's what I've always done.

In the past I've even just used a torx bit.

I have a set of torx screwdrives. Perfect for the job, it came out without a fight.

It measures up to the one you show 😀

Looking for screwdown crown, I notice that there are two sizes of threads for the inside of the crown, 0.25mm and 0.35mm.
It doesn't say which this tube is, I guess 0.25mm?

 

  • Like 1
AndyGSi Distinguished Member

AndyGSi

Posted
Posted
28 minutes ago, mikepilk said:

Looking for screwdown crown, I notice that there are two sizes of threads for the inside of the crown, 0.25mm and 0.35mm.
It doesn't say which this tube is, I guess 0.25mm?

Where did you get these thread sizes?

Are you looking for an original crown?

mikepilk Distinguished Member

mikepilk

Posted
  • Author
Posted (edited)

I found that one on Gleaves, and on Cousins, but 7935 is not in the list of case numbers. The reference pendant tube is C8359 - threads are the right size, but the spline to fit it is only 1.6mm

image.png.05a12eff617313cc996dbd7c6a67015d.png

image.thumb.png.61a518679c18c00c53a7297ee2aa7a24.png

 

Approx sizes as measured

image.png.68511ed1305e2d1eccef7d3ba5293ca9.png

 

 

Edited by mikepilk
AndyGSi Distinguished Member

AndyGSi

Posted
Posted
13 minutes ago, mikepilk said:

I found that one on Gleaves, and on Cousins, but 7935 is not in the list of case numbers. The reference pendant tube is C8359 - threads are the right size, but the spline to fit it is only 1.6mm

The 1.6mm spline is because on the 24.5300.00 they're in the tube where 2.7mm splines on the 24.5330.0 are on the top.

mikepilk Distinguished Member

mikepilk

Posted
  • Author
Posted (edited)
32 minutes ago, AndyGSi said:

Yours is just a flat top, not a step with a raised bubble like the ones on cousins.

Not flat but curved, I wondered what the 'bubble' meant.

It looks like this one - which is just 2x what I paid for the watch !

image.png.3aeaee1411dbf3e688200c60995a9515.png

Just found this on Esslinger, which seems to have every Rolex case but my 7935 !

rolex-chart-case-number-and-case-tube-number.pdf

EDIT
Just discovered that these crowns can be disassembled.  If I can find a small spring to replace the broken one  it might be OK. Not sure where I can find such small springs 1.35mm dia

WIN_20241012_13_47_00_Pro.thumb.jpg.210968cc37b01be743f511a903d82b95.jpg

 

Edited by mikepilk
AndyGSi Distinguished Member

AndyGSi

Posted
Posted (edited)

Did you see the link to the crown i posted?

Was thinking about maybe a pusher spring but the smallest I can see is 1.5mm

Edit

Just remembered about this place.

https://www.febrotec.com/index.php?token=n2ZI8NRfnx&module=shop_articles&work_data=giveMeErrorMessages&index[shop_articles][action]=overview&index[shop_articles][category]=2&index[shop_articles][submitForm]=FALSE&index[shop_articles][filter][2][operator]=about&index[shop_articles][filter][2][text]=&index[shop_articles][filter][2][tolerance]=5&index[shop_articles][filter][3][operator]=about&index[shop_articles][filter][3][text]=&index[shop_articles][filter][3][tolerance]=10&index[shop_articles][filter][4][operator]=about&index[shop_articles][filter][4][text]=&index[shop_articles][filter][4][tolerance]=10&index[shop_articles][filter][5][operator]=about&index[shop_articles][filter][5][text]=&index[shop_articles][filter][5][tolerance]=10&index[shop_articles][filter][6][operator]=about&index[shop_articles][filter][6][text]=&index[shop_articles][filter][6][tolerance]=10&index[shop_articles][filter][7][operator]=about&index[shop_articles][filter][7][text]=&index[shop_articles][filter][7][tolerance]=10&index[shop_articles][filter][8][operator]=about&index[shop_articles][filter][8][text]=&index[shop_articles][filter][8][tolerance]=10&index[shop_articles][filter][9][operator]=about&index[shop_articles][filter][9][text]=&index[shop_articles][filter][9][tolerance]=10&index[shop_articles][filter][11][only_text]=&index[shop_articles][filter][11][only_text_type]=&index[shop_articles][filter][12][only_text]=&index[shop_articles][filter][12][only_text_type]=&index[shop_articles][filter][available][text]=&index[shop_articles][filter][now_available][text]=&index[shop_articles][filter][available][operator]=greater&index[shop_articles][filter][now_available][operator]=greater&submit=

Edited by AndyGSi
mikepilk Distinguished Member

mikepilk

Posted
  • Author
Posted (edited)

I think there's enough thread left in the crown to re-use it.  I must have a tiny spring somewhere in some gadget.

I still need to find the part number to get the correct tube - ideally from someone with Rolex reference documents, @JohnR725 or @nickelsilver ?

Edited by mikepilk
AndyGSi Distinguished Member

AndyGSi

Posted
Posted
42 minutes ago, mikepilk said:

I still need to find the part number to get the correct tube

From what I can see if it's a 2.5mm thread for the case then it's 24.5300, 25.5320 or 24.5330.

The only difference between them is the spline location and length.

Are there definitely no flutes in the bottom of the tube?

 

JohnR725 Distinguished Member

JohnR725

Posted
Posted
On 10/11/2024 at 9:17 AM, mikepilk said:

Tudor

the problem seems to be very little technical documentation. This happened before when somebody asked about anything for this brand there's just like nothing. Whereas Rolex all kinds of documentation exists just not for that case number.

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