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fasteners used in old Pioneer valve amplifier
fasteners used in old Pioneer valve amplifier
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Old 27th June 2020, 07:00 AM   #1
dickyknee is offline dickyknee
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Join Date: Jun 2020
Default fasteners used in old Pioneer valve amplifier

Hi all,

I'n new to the group, recently joined to seek some information on my current project.

I'm in the process of rebuilding an old Pioneer SA-400 amplifier and am having trouble identifying the fasteners used through-out the unit. They're not standard metric threads, though the verniers measure the diameter of the 2 sizes used as 3mm/4mm. most of them are self cutting screws, but even the ones that aren't have the same thread.

They don't seem to be BSW or UN threads either. I've been down to the local screw shop and they are also unable to identify them.

is anyone able to help identify the screws?

thanks.
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Old 27th June 2020, 07:18 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Location: The Jurassic Coast, England. GB
Most were course metric but some were UNC.
Use a thread gauge to measure the size.
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Old 27th June 2020, 09:14 AM   #3
dickyknee is offline dickyknee
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Join Date: Jun 2020
Quote:
Originally Posted by JonSnell Electronic View Post
Most were course metric but some were UNC.
Use a thread gauge to measure the size.
Thanks for the feedback. it seems in this case that they are neither metric threads or UNC and normal thread gauges can't identify them.

worse case if I can't figure them out is to drill the chassis threads out and replace with standard hardware..
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Old 27th June 2020, 09:49 AM   #4
russc is offline russc  England
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Location: W Yorkshire
Possibly JIS?
Talk:ISO metric screw thread - Wikipedia

Astonishingly, screws are available on Ebay.
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Old 27th June 2020, 10:42 AM   #5
MAAC0 is offline MAAC0  Portugal
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I usually use self tapping 2 or 3 mm screws on steel or metal and they work fine.
You must be careful when it comes to fasten on plastic parts or You end up breaking something.
Perhaps I would use Inox types on the outside in order not to rust.
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