Tap Drill Size Chart

4.5 mm Drill Size

metric drill

4.5 mm 0.1772 in 4.50 mm

A 4.5 mm drill measures 0.1772 in. It taps 2 threads in this chart.

What a 4.5 mm drill taps

Every thread this drill cuts between 50% and 85% of thread, deepest first. Outside that band it is the wrong drill for the job, so nothing below that line is listed.

Threads a 4.5 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
#12-28 83.6% #14 73.3%
#12-24 71.7% #16 72.1%

Drills either side

All drill sizes → · Open this drill in the calculator →

4.5 mm drill: common questions

What size is a 4.5 mm drill?
0.1772 inches, which is 4.50 mm. It is a metric drill.
What can I tap with a 4.5 mm drill?
2 threads: #12-28 at 83.6%, #12-24 at 71.7%.
What drill is next to a 4.5 mm?
Down: #16 at 0.177 in. Up: #15 at 0.180 in.