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oscar225 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oscar225 Quote  Post ReplyReply Direct Link To This Post Topic: Silly question
    Posted: 09 Mar 2019 at 07:37
Silly question i know but has anybody any idea of the size of the 2 small machine screws inside the headlight bucket which secure the distribution panel beneath the fusebox, the heads of mine are completely destroyed and nothing in my "small screw box" seems to fit
thanks Chris
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iansoady View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 10:53
No, but there's no such thing as a silly question......

Two of the most useful tools I have are a digital caliper (cost around £10) and a screw gauge (£5 or so). With these you can identify any odd screw. Nuts are a bit more awkward.....

Or even cheaper:


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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 11:54
I think they are M3 if memory serves,or perhaps m4.I'll have a butchers later.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 12:09
Originally posted by iansoady iansoady wrote:

No, but there's no such thing as a silly question......

Two of the most useful tools I have are a digital caliper (cost around £10) and a screw gauge (£5 or so). With these you can identify any odd screw. Nuts are a bit more awkward.....


But when you don't have the screws, just the holes they go in to, it becomes less simple.

I think I could guarantee it's an M something thread, but that won't help.

However, a measuring calliper and thread gauge are very useful tools.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Amboman Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 14:35
I can measure some later today if needed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 15:25
I think Oscar said the heads were mashed uo which implies he has the screws.....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oscar225 Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 16:47
hi guys thanks for the replies i have measured the screws and they are a smidge over 3mm therefore M3 i assume, will look online and try to source some, thanks again Chris
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Amboman Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 17:01
Just measured mine as well. A little over 3 mm as you say. Threads doesn't seem to be Metric - 0.6 isn't exact, but 40 TPI is. Almost seems like a 5-40 screw. Weird. 

In case anyone ever needs it, the screws that secure the fuse block are M4-0.7 x 15, with a split lock and 11 mm o.d. flat washer on each. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 17:26
Like Charlie, I've also had a look at these screws.What I found was that an M3 nut will not go onto the screw and an M3 screw will not screw into the relevant hole.Very strange.So, it aint an M3.Did the Italians have an equivalent to our BA sizes specifically for small electrical parts? Maybe.

Edited by Dave P. - 09 Mar 2019 at 17:30
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 17:46
They also sourced parts from outside Europe, which could account for a non metric thread.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 17:49
I have just read that on some bicycles of Italian manufacture they used fasteners which had metric diameters and SAE threads.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 17:58
Are you sure it's not M 3.5 ?
That's a standard metric with its own pitch (0.6).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Amboman Quote  Post ReplyReply Direct Link To This Post Posted: 10 Mar 2019 at 13:57
Like I posted above, it doesn't seem to be a metric pitch - 0.6 isn't a perfect fit, but 40 tpi is.
Charlie
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