8mm Forum: Elmo 16CL bolt size..?

This is topic Elmo 16CL bolt size..? in forum 16mm Forum at 8mm Forum.

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Posted by Rich Malmsten (Member # 5787) on August 13, 2018, 06:27 PM:

I recently replaced the rubber rollers on an Elmo 16CL. All went well but one of the bolts that attaches the lower front plate was on pretty tight, and its slots got a bit damaged when I took it out. It still is usable, but I'd like to replace it anyway with a new bolt, and stock up on them for future repairs.

I've tied to determine what size it is but haven't been able to. It's small and metric and nothing at the local hardware stores matches it. Does any know the spec on this bolt? (These are the three silver Phillips bolts, not the larger black bolts some models have.)

Posted by Nantawat Kittiwarakul (Member # 6050) on August 13, 2018, 09:23 PM:

Not 100% certain,but it could be some odd-size metric screw. My Sony camcorder also use tiny M-1.7 screws (or sort of that uncommon size,couldn't remember the exact fugure) which I fortunately attain them from online store to fix it. [Wink]

Posted by Paul Browning (Member # 2715) on August 14, 2018, 03:53 AM:

They do have odd size diameter screws on a lot of Japanese products, sometimes its the machining process, where they use machine s to self tap the thread, and you will find the thread looks like it has corners on it, best is to retap with a standard size metric screw thread, will be half a pitch different in most cases, so thread will start and then stop....

Posted by Rich Malmsten (Member # 5787) on August 17, 2018, 07:54 AM:

I determined the screw size to be M3-0.50:

diameter = 3mm
thread = 50 per inch
length = 5mm

They are available through Fastenal, part number 91186, for only 4 cents each.

Posted by Paul Browning (Member # 2715) on August 17, 2018, 02:31 PM:

Do you have access to thread gauges, this may confirm your info. We normally check with a overhead projector with the a pitch gauge drawing magnified with the correct profile, this would be placed in the light path to accurately check. It does not need to be out by much to strip the thread in either if forced......

Posted by Rich Malmsten (Member # 5787) on August 21, 2018, 09:47 AM:

The Fastenal clerk and I did check my Elmo screw’s size in his set of standard metric threads and it fit. I will be getting a couple of these screws. If they don’t fit in my projector, I’ll let everyone know.

Posted by Rich Malmsten (Member # 5787) on August 27, 2018, 08:27 AM:

I purchased these screws at Home Depot (2 for $0.39) and it fits. These are 6mm long instead of the original 5mm length, but M3-0.50 is definitely the correct specification.

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