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Instrument screws
I am trying to get new brass screws for my Type 5/17 face plate and the instrument light holder.
The screw measures 0.375 long (right at 10 mm) by .097 (maybe .0965?) across the threads. I don't have the correct pitch gauge so am not sure what it is. If these are 2.5 mm, I would guess the pitch is 0.45, or if #3's then I would guess something like a 48 as the thread of the 2-56 is not just smaller in diameter but in pitch. If push comes to shove, I will tap them out to 4-40's. Not my first choice, but don't seem to be able to find what I need yet. |
www.mcmastercarr.com Pan head metric brass screws.
www.mdmetric.com Most other style metric screws, in brass and steel. Terrible website to navigate, but a lot off stuff in there. |
Pan heads are probably the right ones, but you could also use cheese heads if the threads turn out to be metric. Seems fitting for a Wisconsin project, somehow. :cool:
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As always, great info. Thanks Vet!
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Funny you should say that, John, because 2 of the screws are Fillister type (for the instrument light holder) but can only find "cheese heads" in brass in these smaller sizes. Hard to imagine there is not a vibrant market for these 100 year old fasteners, eh?
Other interesting findings on the face plate mounting screws, one screw was a flat head (under the instrument light fixture), the other are oval heads. Any idea if using flat heads all around will mike any difference? |
Chip,
I'm not at all sharp on antiquities. Doesn't it seem likely that all the screws were the same? I seem to be able to get better results with oval heads, I bung them up less often. More on cheese-head screws when i can remember what I owned that had them. memory is too loaded up with stuff I wish i could forget, mostly all the dumb things i've done. akkk. |
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All the screws on my 5/17 compasses have been BA thread.
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