Hole size for self tapping M4 x .7 screw?

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  • Best Answer

    2.5 mm drilled hole.

  • 1 decade ago

    3/16 approx. The 4 is hardness, 8 being very hard. With a four you should be able to self-tap through 1/8" mild iron. With an 8 up to half inch of iron.

  • 1 decade ago

    no sure off hand but for future use if U have a drill hold, one or the one that has holes cut in it for each specific drill bit, or a drill bit guide.

    Use that to put the screw into, if with wriggling the screw around, not turning it, U can push the screw into the hole, then go for the next one down, if it even jumps one turn use the smaller one, that's what i do.

    i hope this helps for the future

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