S silencer heat shield bolt

I am trying to figure out what is the thread on the little bolts that hold the heat shields on the silencers on the S model. Here is a picture of the original bolt that takes a 3mm allen wrench, and next to it is a 10-32 bolt. Is this the difference between the American Standard and Whitworth? The 10-32 has the same pitch, but will not thread into the S silencer.[/img]
Otherwise where can I get these little screws?
thanks,
Dave
69 S in the process

DogT said:

Is this the difference between the American Standard and Whitworth? The 10-32 has the same pitch, but will not thread into the S silencer.

Click to expand...

A "Whitworth" thread form probably, but not necessarily Whitworth thread.

Unfortunately I cannot find any information on the "061316 Silencer heat shield screw (4)" listed anywhere except the 68-70 parts book, so I am unable to say what the thread type may be?

Possibly it's 3/16" x 32 tpi BSF or BSCy (CEI)? Or 2BA x 32.4 tpi?

It's 2 BA X 1/4 inch long button head allen screw. It will need to come from a Norton shop. DomiRacer has them for $0.78 each.

Dave , FWITW I was chasing the same. There are metric ones available that look exacltly the same(allen key) and stainless steel . Not sure of the size as i am at work and cant check but i bought a tap for a couple of dollars which was just slightly oversize ran it thu and the screws are a perfect match to the original ones still there at a fraction of the cost ( in Aus by the time i get smaller bits the postage from OS kills the price )

I just ordered some from Norvil Motorcycle Company in the U.K. they are listed in their catalogues as '060946 Screw - heat shield - set of six 1.43 pounds'

Man, you guys are good. Thanks for the info. I will probably get some from Domi, and the 750 exhaust nuts too. Good info.

Thanks,
Dave
69/70 S

Dave, Any chance of some photos? I am also in the middle of an S-type restoration, although mine was originally a fastback.
Dave

Dave M

Well, here is a pic from 1972 not long after I got it



and here is one just before I started stripping it completely down in '03. It was running before I put it away in around '78.

So far:
new fork tubes and bushings
new chrome wheels and ss spokes
new S exhaust, i had a roadster set on it last
polished all cases and hubs
new seals in the tranny cover
swingarm bushing oversized and replaced with SS and extra mounts
new original style isos
new seat cover
sealed bearings in wheels and steering

to do yet
finish seat
powdercoat frame cradle, tree and rear brake
shocks
chain shield old one is pretty shot
chrome rear and front fenders
sleeve amals
paint in the original blue flake

Here are most of the parts less the frame





My next project is to powdercoat and then I can start putting it together.

Dave

Thanks for the photos Dave, I note that you were looking for heat shield screws even in 1972! I will try to post some pictures of my own project, which started life as a box of assorted parts which had been stored in an abandoned pig-stye for decades. Although I can't be sure I suspect the frame was originally from a Fastback, because there were many of these models sold here in Hong Kong. It is the same model of frame as the S-Type and in the absence of any history I decided to build it in this configuration. I am going for a Yellow finish on the tank and side covers.