[strongtower1]

It does not seem to be 6-48tpi. Any real world input?? (Yes. I inadvertently threw mine into the huge jar of gun screws and lost them!) D'OH!!!

 

[Gumpy]

I'm not sure. Let me see if I can find out.

 

[MattNH]

Is it bigger or smaller than the 6? If smaller it's likely 4-48 and if bigger likely 8-40