Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Model Engineers (ME) Thread Table, great for the wall of your workshop I refer to mine constantly.

(Attachment Link)

Hi Jim,

I would not recommend the first table you posted for ME threads... it has some glaring errors for tapping drill sizes for 7/32", 1/4" and 9/32" diameter threads.

One would not expect the tapping drill size for a 32tpi thread to be a larger drill than that required for a 40tpi thread.

The second and third tables posted are correct.

I thought I would bring your attention to it just in case someone copies the first one.

Keep Happy.

Best regards.