Number drill bit #50. A #50 drill bit is a small bit with a diameter of 0.070 inches (70 thousandths of an inch) or 1.778 millimeters, commonly used for tapping smaller machine screws like a #2-56 or #1-64.
Here's a quick breakdown:
Decimal Inches: 0.070"
Millimeters (mm): 1.778 mm
Common Use: Pilot hole for #2-56 or #1-64 taps.
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