I went to a hardware specialty store with one of the Torx screws from
the 8643. They said it was not a metric diameter. Nor was it 32 threads
per inch, a US "coarse" thread. They said it look like it was a US?
#6-40, an uncommon but US-standard "fine thread". Today I bought a
baggie with 20 and.......it appears to be close to the right diameter
but it is not 40 threads per inch.

I have not figured out what the thread is, but it is NOT a US fine
threaded, 6-40.

Bill


On 3/17/2025 3:54 AM, Steve Hendrix wrote:
> On 2025-03-17 12:25 AM, Wayne Eckert via groups.io wrote:
>> Hi can someone tell me what thread the screws are that hold the back
>> panel on? HP8656. I am assuming they are 5/32 as 3mm and 4mm metric
>> are either too small or too big. or wrong thread
>
> There's also a 3.5mm standard thread, used on IEEE-488 connectors,
> that might be a possibility.
>
> Steve Hendrix
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