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Dunlop Taper Bushes

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Stephen Osborne20/01/2020 10:52:04
20 forum posts
1 photos

I am looking to fix a home machined pulley to a motor shaft using a Dunlop taper bush.

It is possible to purchase a bolt-on hub (female) to afix to the pulley which will mate with the bush (male) perfectly.

However, the dimensions of the hub are too large for my pulley – I think they are meant to be used on a fan etc.

Does anyone have experience of this machining task? I am happy with measuring and reproducing the exact taper but the location of the half-holes seems more problematical.

Any thoughts would be appreciated.img_1460.jpg

Michael Gilligan20/01/2020 11:09:26
14783 forum posts
635 photos

It might be simplest to adapt a commercial sprocket : **LINK**


David Jupp20/01/2020 11:28:18
713 forum posts
17 photos

Fenner produce adaptors beyond the bolt on style for Taper Lock Bushes, their 'hub adaptors' may be worth a look.

Ian Parkin20/01/2020 11:56:53
704 forum posts
181 photos

My supplier calls them weld on hubs

Brian Wood20/01/2020 12:56:53
2072 forum posts
37 photos

Hello Stephen,

They also are known as taper lock hub bushes. Google for suppliers and the many various sizes available, they are not expensive..

A point to be aware of is that the two holes that accept the clamping grub screws are NOT across a diameter, they are displaced at 5 degrees below centre on either side to enhance the collapsing action of the bore onto the motor shaft. The hub cone angle is 8 degrees



David Jupp20/01/2020 13:35:56
713 forum posts
17 photos
Posted by Ian Parkin on 20/01/2020 11:56:53:

My supplier calls them weld on hubs

That is yet another type.  The 'hub adaptor' is a split bushing (with or without a keyway) and sits in a cylindrical hole.

Edited By David Jupp on 20/01/2020 13:53:54

Paul Lousick20/01/2020 15:16:23
1286 forum posts
512 photos

Also lots available on ebay. Do a search for taper lock


HOWARDT20/01/2020 15:29:48
490 forum posts
14 photos

I do have a drawing showing all dimensions somewhere. Remember there are two holes to hold the taper lock in and the threaded to act as an extractor. Will dig out drawings and get back unless someone beats me to it.

Tim Stevens20/01/2020 17:27:59
1123 forum posts

You might get more sense in terms of what the dimensions are, and what fits what, etc by going to a 'bearing supplier' (at least, in the UK). I have had good service from Bearing Boys, and Simply Bearings, and yes, they do pulleys and belts, and all sorts of useful stuff, not just bearings.

Cheers, Tim

Michael Gilligan20/01/2020 18:02:27
14783 forum posts
635 photos
Posted by Tim Stevens on 20/01/2020 17:27:59:

You might get more sense in terms of what the dimensions are, and what fits what, etc by going to a 'bearing supplier' (at least, in the UK). [...]


... and also by downloading this: **LINK**


Clive Foster20/01/2020 18:07:12
1992 forum posts
73 photos

Agree with Tim about going to "bearing suppliers". I got some bolt on ones from Engineers Mate some years ago which were fine. They still list such things, not cheap tho'. **LINK**


Michael Gilligan20/01/2020 18:17:10
14783 forum posts
635 photos


That makes the Sprockets from RS look very reasonably priced for Stephen's job


HOWARDT21/01/2020 13:43:39
490 forum posts
14 photos

TaperLock dimensions

Found my dimension sheet for bores to accept taper lock bushes, rather than post found the same on the above link.


Michael Gilligan21/01/2020 14:11:47
14783 forum posts
635 photos

Useful reference document, Howard ... Thanks


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