Tap drill answer
What Size Drill Bit for M12 x 1.75 Tap?
For a M12 x 1.75 tap, a common reference drill is 10.2 mm, which is 0.4016 in or 10.20 mm. Verify the value for material, tap type, and required thread engagement.
M12 x 1.75 tap drill quick answer
Method: Metric values use the visible major-diameter-minus-pitch estimate unless an alternate chart assumption is displayed. Reviewed 2026-07-24.
How to use this M12 x 1.75 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.
What size drill bit for M12 x 1.75 tap?
This page shows 10.2 mm as the basic metric estimate for M12 x 1.75 because 12.0 mm minus 1.75 mm gives 10.25 mm, rounded here to 10.2 mm. Many 75% thread charts show 10.5 mm instead.
M12 x 1.75 tap drill size for 75% thread
A 75% thread chart may choose a larger drill than the quick formula. That can make tapping easier while still leaving useful thread engagement for many general jobs.
Is M12 x 1.75 tap drill 10.2 mm or 10.5 mm?
Use 10.2 mm when you are applying the simple metric estimate. Use 10.5 mm when your chart or tooling guidance targets that practical thread percentage. Do not mix the two without checking the job requirements.
M12 x 1.75 vs M12 x 1.5 tap drill size
M12 x 1.75 is a coarse metric thread. M12 x 1.5 is finer and will not use the same tap drill. Always read the pitch after the x before choosing a drill.