What drill size is used for M5 x 0.8?

A common reference value is 4.2 mm, or 0.1654 in / 4.20 mm.

Can I use a larger drill for M5 x 0.8?

Sometimes, but that reduces thread engagement. Check the drawing and the required fit before changing the drill size.

Tap drill answer

What Size Drill Bit for M5 x 0.8 Tap?

For a M5 x 0.8 tap, a common reference drill is 4.2 mm, which is 0.1654 in or 4.20 mm. Verify the value for material, tap type, and required thread engagement.

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M5 x 0.8 tap drill quick answer

Recommended reference drill4.2 mm0.1654 in / 4.20 mm

How to use this M5 x 0.8 value

This page gives a common chart value for hand tapping and general reference work. Use a different value when your drawing specifies a thread class, percent thread, forming tap, pipe thread, thin wall, brittle material, or plated/coated part.

Start with the listed drill size.
Confirm the tap type and thread engagement target.
Test in scrap material when fit matters.
Use cutting fluid and proper chip clearing for deeper holes.

Related references

Tap Drill ChartLook up recommended tap drill sizes for UNC, UNF, and metric threads.Drill and Tap ChartMatch common taps to drill sizes, decimal equivalents, and working notes.Metric Tap Drill ChartReference metric tap drill sizes for M3 through M12 coarse threads.Sources and MethodologyHow this site stores chart values, checks assumptions, and separates reference values from job-specific engineering decisions.