RC-Monster Forums - View Single Post - M3 and 4-40 thread

Gustav · 06.12.2006, 01:10 PM

No.they're about the same diameter but M3 is a finer thread(more threads per inch/different pitch).Are you sure you haven't got 2 the same there? If you have a plastic part with untapped holes then you could probalby use either since the diameter is so similar,but a 4-40 screw will definately not fit a M3 nut/thread.
I use both alot and can tell the difference by looking at a screw.

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Gustav RC-Monster Aluminum Offline Posts: 916 Join Date: Jul 2005 Location: UK	06.12.2006, 01:10 PM No.they're about the same diameter but M3 is a finer thread(more threads per inch/different pitch).Are you sure you haven't got 2 the same there? If you have a plastic part with untapped holes then you could probalby use either since the diameter is so similar,but a 4-40 screw will definately not fit a M3 nut/thread. I use both alot and can tell the difference by looking at a screw.