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Manx Norton 2LS anchor bolt spec

Submitted by andy_bonner on Mon, 23/03/2020
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Hi please can you help with the dimensions of the Manx Norton 2LS front brake anchor peg? Especially the thread size/form. It will give me a little job to do in between the many chores around the house that my wife has lined up for me. Stay safe, thanks Andy

Submitted by philip_hannam on Tue, 24/03/2020

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Boty RGM and A/N offer a Torque Stop Pin - p/n 060325.  It may be what you are looking for.  The thread end appears to be 5/8" dia with 18tpi. Possibly UNF?

Just checked, I think that part number is for the rear, just the thread form/size would be all I need for the front as I am going to have to make my own. I am trying to work with what I have,a full width hub and Manx tls brake plate. It sits a little more inboard than standard and I will have to make the anchor pin a bit longer to compensate.

 

Submitted by mikael_ridderstad on Fri, 12/06/2020

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I'd be very surprised if it is UNF, Norton very reluctantly started using those foreign threads on the Commando. More likely Cycle threads ( CEI or BSC ), which for smaller sizes has 26 tpi, for larger sizes either 26 tpi or 20 tpi.

Submitted by dave_massam on Sat, 13/06/2020

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1/2 UNF and 1/2 CEI both have 20 tpi and a 60 degree thread angle so you can call it what you like.

Submitted by david_cooper on Sat, 13/06/2020

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If it is to be longer than usual, it will be more highly stressed than usual. I don't know what strength they were, but you need to use something good.

 Is the 18tp what you have measured? In my tables  5/8 whit has only 11tpi, and a thread as coarse as that would remove a lot of the bolt bending strength. So maybe UNF after all! 

If you have a good engineering hardware shop, you might be able to buy a nice modern grade 10.9 bolt to fit.

Submitted by andy_bonner on Sat, 13/06/2020

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It is 1/2"  20tpi 60 degree which is the same for both UNF and Cycle. I have a part machined one which I obtained from Andy Molnar, in standard length, from which I thought that I might make a longer copy. Unfortunately this looks like a non starter as the new peg would need to be too long.

Yes you are right and having mocked it all up this morning I can see that the peg would have to be too long to make it work. Back to the drawing board, thanks

 


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