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Drill Size Chart

Drill Size Chart, 0.3 to 4 mm

Small drill sizes in millimeters and inches, with what each common size is used for. Save this page or print it for the bench.

DRILL INCHES COMMON USE
0.3 mm 0.0118 in PCB vias, smallest common size
0.4 mm 0.0157 in PCB vias
0.5 mm 0.0197 in
0.6 mm 0.0236 in
0.7 mm 0.0276 in
0.8 mm 0.0315 in Through-hole leads: resistors, DIP chips
0.9 mm 0.0354 in
1 mm 0.0394 in Pin headers on 0.1 in pitch
1.1 mm 0.0433 in
1.2 mm 0.0472 in
1.3 mm 0.0512 in
1.4 mm 0.0551 in
1.5 mm 0.0591 in
1.6 mm 0.063 in Tap drill for an M2 thread
1.8 mm 0.0709 in
2 mm 0.0787 in
2.2 mm 0.0866 in Clearance hole for an M2 screw
2.5 mm 0.0984 in Tap drill for an M3 thread
3 mm 0.1181 in
3.175 mm 0.125 in 1/8 in, the shank size of most micro bits
3.2 mm 0.126 in Clearance hole for an M3 screw
3.5 mm 0.1378 in
4 mm 0.1575 in
Test the fit on scrap first: a nominal 1 mm bit does not always make a 1 mm functional hole. Inch values are exact conversions (mm / 25.4), rounded to 4 places.

Before you drill under 1 mm

Read our free Small Holes Field Guide: twelve checks for fewer snapped bits and ruined parts.

Tools for these sizes

Mikrabench Mini Drill Press, 0.3-4 mm chuck See
PCB micro drill bits, 3.175 mm shank, 10 of one size See
PCB micro drill bit set, 10 pieces See
Digital caliper, 150 mm, fractions and mm See
Not sure which size you need? Write to support@arvonelle.com with what you are drilling. A real person answers within one business day.