Tap and Clearance Hole Chart – Metric

Metric Drill Chart NightShade Electronics
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Machine Screw Size Tap Drills Clearance Hole Diameters
Aluminum
Brass & Plastic
75% Thread
Stainless Steel
Steels & Iron
50% Thread
All Materials
Close Fit Free Fit
Name Major Dia.
(mm)
Thread Pitch
(mm)
Drill Size (mm) Closest American Drill Size Drill Size (mm) Closest American Drill Size Drill Size (mm) Closest American Drill Size Drill Size (mm) Closest American Drill Size
M1.5 1.5 0.35 1.15 56 1.25 55 1.60 1/16 1.65 52
M1.6 1.6 0.35 1.25 55 1.35 54 1.70 51 1.75 50
M1.8 1.8 0.35 1.45 53 1.55 1/16 1.90 49 2.00 5/64
M2 2 0.45 1.55 1/16 1.70 51 2.10 45 2.2 44
0.40 1.60 52 1.75 50
M2.2 2.2 0.45 1.75 50 1.90 48 2.30 3/32 2.4 41
M2.5 2.5 0.45 2.05 46 2.20 44 2.65 37 2.75 7/64
M3 3 0.60 2.40 41 2.60 37 3.15 1/8 3.30 30
0.50 2.50 39 2.70 36
M3.5 3.5 0.6 2.9 32 3.1 31 3.7 27 3.85 24
M4 4 0.75 3.25 30 3.5 28 4.2 19 4.4 17
0.7 3.3 30 3.5 28
M4.5 4.5 0.75 3.75 25 4 22 4.75 13 5 9
M5 5 1.00 4.00 21 4.40 11/64 5.25 5 5.50 7/32
0.90 4.10 20 4.40 17
0.80 4.20 19 4.50 16
M5.5 5.5 0.90 4.60 14 4.90 10 5.80 1 6.10 B
M6 6 1.00 5.00 8 5.40 4 6.30 E 6.60 G
0.75 5.25 4 5.50 7/32
M7 7 1.00 6.00 B 6.40 E 7.40 L 7.70 N
0.75 6.25 D 6.50 F
M8 8 1.25 6.80 H 7.20 J 8.40 Q 8.80 S
1.00 7.00 J 7.40 L
M9 9 1.25 7.80 N 8.20 P 9.50 3/8 9.90 25/64
1.00 8.00 O 8.40 21/64
M10 10 1.50 8.50 R 9.00 T 10.50 Z 11.00 7/16
1.25 8.80 11/32 9.20 23/64
1.00 9.00 T 9.40 U
M11 11 1.50 9.50 3/8 10.00 X 11.60 29/64 12.10 15/32
M12 12 1.75 10.30 13/32 10.90 27/64 12.60 1/2 13.20 33/64
1.50 10.50 Z 11.00 7/16
1.25 10.80 27/64 11.20 7/16
M14 14 2.00 12.10 15/32 12.70 1/2 14.75 37/64 15.50 39/64
1.50 12.50 1/2 13.00 33/64
1.25 12.80 1/2 13.20 33/64
M15 15 1.50 13.50 17/32 14.00 35/64 15.75 5/8 16.50 21/32
M16 16 2.00 14.00 35/64 14.75 37/64 16.75 21/32 17.50 11/16
1.50 14.50 37/64 15.00 19/32
M17 17 1.50 15.50 39/64 16.00 5/8 18.00 45/64 18.50 47/64
M18 18 2.50 15.50 39/64 16.50 41/64 19.00 3/4 20.00 25/32
2.00 16.00 5/8 16.75 21/32
1.50 16.50 21/32 17.00 43/64
M19 19 2.50 16.50 21/32 17.50 11/16 20.00 25/32 21.00 53/64
M20 20 2.50 17.50 11/16 18.50 23/32 21.00 53/64 22.00 55/64
2.00 18.00 45/64 18.50 47/64
1.50 18.50 47/64 19.00 3/4