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Metric Tap Chart

  Tap Drill Clearance Drill
Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit Standard Fit
75% Thread 50% Thread
Screw Size Major Dia (mm) mm per Thread Drill Size Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial
M1.5 x 0.35 1.5 0.35 1.15 #56 1.60 #55 1.6 1/16 1.65 #52
M1.6 x 0.35 1.6 0.35 1.25 #55 1.70 #54 1.8 #49 1.75 #50
M1.8 x 0.35 1.8 0.35 1.45 #53 1.90 1/16 1.9 #49 2.00 5/64
M2 x 0.45 2 0.45 1.55 1/16 1.70 #51 2.1 #45 2.20 #44
M2 x 0.4 2 0.40 1.6 #52 1.75 #50
M2.2 x 0.45 2.2 0.45 1.75 #50 1.90 #48 2.30 3/32 2.40 #41
M2.5 x 0.45 2.5 0.45 2.05 #46 2.65 #44 2.9 #32 2.75 7/64
M3 x 0.5 3 0.5 2.5 #39 2.70 #36 3.4 #29 3.30 #30
M3.5 x 0.6 3.5 0.6 2.9 #32 3.10 #31 3.9 #23 3.85 #24
M4 x 0.75 4 0.75 3.25 #30 3.50 #28 4.20 #19 4.40 #17
M4 x 0.7 4 0.7 3.3 #30 3.50 #28
M4.5 x 0.75 4.5 0.75 3.75 #25 4.00 #22 4.75 #13 5.00 #9
M5 x 1.00 5 1.0 4.00 #21 4.40 11/64 5.25 #5 5.50 7/32
M5 x 0.9 5 0.9 4.10 #20 4.40 #17
M5 x 0.8 5 0.8 4.2 #19 4.50 #16
M5.5 x 0.90 5.5 0.9 4.60 #14 4.90 #10 5.80 #1 6.10 B
M6 x 1 6 1 5 #8 5.40 #4 6.30 E 6.60 G
M6 x 0.75 6 0.75 5.25 #4 5.50 7/32
M7 x 1.00 7 1.00 6.00 B 6.40 E 7.40 L 7.70 N
M7 x 0.75 7 0.75 6.25 D 6.50 F
M8 x 1.25 8 1.25 6.8 H 7.20 J 8.40 Q 8.80 S
M8 x 1 8 1 7 J 7.40 L
M9 x 1.25 9 1.25 7.80 N 8.20 P 9.50 3/8 9.90 25/64
M9 x 1.0 9 1.0 8.00 O 8.40 21/64
M10 x 1.5 10 1.5 8.5 R 9.00 T 10.50 Z 11.00 7/16
M10 x 1.25 10 1.25 8.8 11/32 9.20 23/64
M10 x 1.0 10 1.00 9.0 T 9.40 U
M11 x 1.50 11 1.50 9.50 3/8 10.00 X 11.60 29/64 12.10 15/32
M12 x 1.75 12 1.75 10.2 13/32 10.90 27/64 12.60 1/2 13.20 33/64
M12 x 1.50 12 1.50 10.50 Z 1.00 7/16
M12 x 1.25 12 1.25 10.8 27/64 11.20 7/16
M14 x 2 14 2 12 15/32 12.70 1/2 14.75 37/64 15.50 39/64
M14 x 1.5 14 1.5 12.5 1/2 13.00 33/64
M14 x 1.25 14 1.25 12.8 1/2 13.2 33/64
M16 x 2 16 2 14 35/64 14.75 37/64 16.75 21/32 17.50 11/16
M16 x 1.5 16 1.5 14.5 37/64 15.00 19/32
M18 x 2.5 18 2.5 15.5 39/64 16.50 41/64 19 3/4 20.00 25/32
M18 x 2.0 18 2.0 16.00 5/8 16.75 21/32
M18 x 1.5 18 1.5 16.5 21/32 17.00 43/64
M20 x 2.5 20 2.5 17.5 11/16 18.50 23/32 21 53/64 22.00 55/64
M20 x 2.00 20 2.0 18.00 45/64 18.50 46/64
M20 x 1.5 20 1.5 18.5 47/64 19.00 3/4
M22 x 2.5 22 2.5 19.5 49/64 20.00 25/32 25 1 26.00 1-1/32
M22 x 1.5 22 1.5 20.5 13/16 20.75 13/16
M24 x 3 24 3 21 53/64 21.50 27/32 27 1-5/64 28.00 1-7/64
M24 x 2 24 2 22 7/8 22.25 7/8
M27 x 3 27 3 24 15/16 24.50 31/32 30 1-3/16 32.00 1-1/16
M27 x 2 27 2 25 1 25.25 1

 

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