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Joined: Jul 2004
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I got a response from Halex and the lady who answered said she will find out what kind of screw it is.




Greg Fretwell
Joined: Jul 2004
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I am thinking it might be a #12 but the pitch does not seem to be 24 tpi.
I may still have some 12-24 screws around here somewhere. They were standard for 14" racks.


Greg Fretwell
Joined: Jan 2005
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I'd like to point out that there is absolutely no reason for a manufacturer to use any 'standard' thread. If you look closely at many household items, you will find threads in -literally- every shape and size imaginable. ou might as well put up that Machinery's Handbook.

With zinc being quite malleable, there is also no real need for the screw to match the socket very closely. I would not be surprised if the rough zinc casting had a plain hole, that the screw was forced into while the zinc was still quite soft. Voila! Perfect fit!

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I heard back from Halex. 12-24 it is.


Greg Fretwell
Joined: Sep 2002
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12-24 is a common size on telcom racks, also was used on the now discontinued ITE Vacu Break NEMA 1 HD safety switches cover interlock, found that out when trying to replace a missing cover screw, otherwise a oddball thread size.

Joined: Apr 2002
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Greg:

This link has what you want,

http://www.mcmaster.com/#socket-head-cap-screws/=qzqxv8

They used to 'sell' loose quantities, albeit a higher price then the 'box' cost.


John
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They still have a fairly limited selection in stainless 12-24.
I am just going with the ones Halex gave me.


Greg Fretwell
Joined: Dec 2001
Posts: 2,498
T
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I did a quick Google search and it seems that M5x1.0 was indeed used for a few very obscure applications like old Peugeot bicycles but is insanely hard to find nowadays. You do encounter weird screws from time to time... a while ago I installed some Italian receptacle boxes (they have listings for all European countries and you can get receptacles to every standard so they're sold in Austria) and needed longer screws in a kitchen with thick tile. The originals look like a very coarse M3.5 and I couldn't find them anywhere. I ended up using M3.5 sheet metal screws.

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