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Collet Identification and info wanted please.

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Martin King 222/11/2015 20:24:46
640 forum posts
240 photos

Hi all,

Just got back from a large tool auction and in the lots I purchased there is a full set of Imperial collets which I am going to dispose of on EBay.

Naturally I wish to describe these accurately but have never had any of this size and design.

I wonder if anyone can shed some light for me on the correct ID of these.collets 1.jpg

They all have the number 2804 on them with a logo that looks like the CC of Coco Chanel! smiley

Imperial sizes from 1/32" up to 3/4"; the parallel shank diameter is 25mm and the external diameter of the threaded end is 23mm; 33mm maximum diameter at the bell end.

Any help most welcome.



JasonB22/11/2015 20:33:30
16865 forum posts
1815 photos
1 articles

Crawford Collets is the CC, have a look here to find the size/type

Boiler Bri22/11/2015 21:25:35
813 forum posts
287 photos

Nice haul. Should do plenty of tool holding with them. I am in the canaries at the moment and have brought Harold halls milling book to read. Even though I have s bit of experience in milling it's a good read with plenty of advice on milling tool holders.


Martin King 222/11/2015 21:36:30
640 forum posts
240 photos

Thanks Jason,

checked the link but I guess they must be old stuff because the number and sizes do not show up.


Versaboss22/11/2015 22:02:23
429 forum posts
51 photos

Too bad you did not give more informations: total length, angle of head,keyway or not, thread metric or imp., normal or sawtooth...

In my eyes they look suspiciously like W25 collets. .

Some numbers for these: length 97.6 mm, head dia. 33.7 mm, thread (very special! sawtooth) dia, 24.7mm / 15 tpi with angles 45/5 deg., head angle 15°, keyway 5 mm

Hope this can help?

Regards, HansR.

Robbo22/11/2015 22:06:57
1504 forum posts
142 photos


Crawford collets no 2804 were/are used on Smart & Brown lathes, and may be specific to those machines.

So they won't be in a current Crawford list .

I should try the Yahoo S & B Group for confirmation

Edited By Robbo on 22/11/2015 22:09:04

Nick Hughes22/11/2015 22:14:34
209 forum posts
131 photos

Anything match on this chart ?:-


Martin King 223/11/2015 09:52:38
640 forum posts
240 photos


More info:

There is a 4mm keyway; total length is approx 92.5mm;

external diameter of the threaded end is 23mm; 33.7mm maximum diameter at the bell end.


John Stevenson23/11/2015 10:34:05
5068 forum posts
3 photos

If they are a Crawfords collet they will have a left hand thread on them.

Also is it a 'normal' thread or one with one side more angled than the other ?

Michael Gilligan23/11/2015 11:38:04
14555 forum posts
633 photos
Posted by John Stevenson on 23/11/2015 10:34:05:

If they are a Crawfords collet they will have a left hand thread on them.



Could you please elaborate upon that rather sweeping statement ?

I have Crawford Collets in several styles, none of which has a left hand thread.



[briefly out of 'retirement' to ask this]

Martin Connelly23/11/2015 12:49:41
908 forum posts
112 photos

I would be interested in them for my Smart and Brown Model M.


Trev6723/11/2015 14:19:58
37 forum posts
1 photos

Hi Martin

2804 are the collets for a Smart & Brown model A, I think they also fit the model L plain turning and capstan lathes, I don't know about the others. The ones for my Model A are all marked 2804. I think they are a specific collet for these lathes, slightly bigger than a 3C and smaller than a 5C.

The sizes will be imperial, the 25mm diameter is 63/64 which is the spindle bore, the thread is approx 0.9" diameter probably 29/32, and 24tpi RH.

Hope this helps


Martin King 223/11/2015 15:10:22
640 forum posts
240 photos

OK, just measured them properly on a good mitutoyo mic.

The parallel diameter is 0.9834" and tghe diameter across the treads od is 0.9033".

Thread form looks totally symetrical to my eye under a x10 lens. Thread is RH

Looks like Trevor is on the money!

Martin C: send me a PM with a sensible offer that you are happy with to include the 2 index blocks as they are no good without the collets.

Thanks to all for the help.


Martin Connelly15/12/2015 13:18:04
908 forum posts
112 photos

I have dug out an old print out of the Crawford Collets products and scanned it to a PDF. There are 29 pages with dimensions and capacities listed by manufacturer so I was wondering if there was a good place to put this file or is it just a case of email it to people if they ask for it?


Emgee15/12/2015 14:10:57
1319 forum posts
211 photos

Hi Martin

Not sure if the Photo Album will allow PDF but if you save the scans as jpg they should upload to your Album.


Michael Gilligan15/12/2015 15:05:26
14555 forum posts
633 photos


As Emgee sugests ... the album will only accept jpg

If that conversion is inconvenient for you, I would be happy to do it.

PM sent.


Martin Connelly15/12/2015 18:13:24
908 forum posts
112 photos

I could convert to jpg format but there are 29 pages and it is probably best kept as one file. If someone has a web site that could make it available to anyone searching for collet dimensions for lots of manufacturers' machines that would be the best place for it. I have copied the Smart & Brown section to a single page made a new table with the data in it and put it in the files section of the Yahoo group for those lathes. It would be a lot of work to do that for all the other makes. As I write this it occurs to me that it may be something that could be put on the web site. I will ask Tony about it.


Michael Gilligan16/12/2015 16:46:05
14555 forum posts
633 photos

With thanks to Martin for spplying the PDF ...

I have put the supplied pages into individual jpg files, here

The files are numbered to reflect the pagination.




Edited By Michael Gilligan on 16/12/2015 16:48:07

Edited By Michael Gilligan on 16/12/2015 16:54:38

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