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I have the screw from an HP8664A, which I assume will be similar. Pan head, torx drive. I checked it with various thread gauges, and if you're not looking closely (i.e. under a magnifier or microscope) you'd be inclined to say it's 42TPI, but under the microscope I can see 42TPI isn't correct - the screw gets every so slightly out of sync with the thread gauge over the length of the screw. Checking the metric gauges, it meshes exactly with 0.6mm, so 搁别苍é别 is correct - it must be 3.5mm 0.6mm/thread You should get yourself a set of thread gauges - they come in handy for all sorts of stuff, and they're not that expensive. $10 gets you one with both metric and imperial. They tend to have them in the hardware store if you want to go to a local brick and mortar store to get them, but they can be hard to find - usually tucked away in a dusty corner of the hand tool section somewhere. Link here as an example, not an endorsement of this particular gauge (though the ones I have are very similar, but came with a tap and die set, and I got another set when I bought 'fishtail' gauges for threading on the lathe with a single point threading tool): On Tue, Mar 18, 2025 at 9:39?AM 搁别苍é别 via <k6fsb.1=[email protected]> wrote:
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