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Drill Tap Chart                              Back to Conversion list

(Standard) Coarse Thread (Standard) Fine Thread
0-80 3/64 1-72 # 53
1-64 # 53 2-64 # 50
2-56 # 50 3-56 # 45
3-48 # 47 4-48 # 42
4-40 # 43 5-44 # 37
5-40 # 38 6-40 # 33
6-32 # 36 8-36 # 29
8-32 # 29 10-32 # 21
10-24 # 25 12-28 # 14
12-24 # 16 1/4-28 # 3
1/4-20 # 7 5/16-24 Ltr I
5/16-18 Ltr F 3/8-24 Ltr Q
3/8-16 5/16 7/16-20 25/64
7/16-14 Ltr U 1/2-20 29/64
1/2-13 27/64 9/16-18 33/64
9/16-12 31/64 5/8-18 37/64
5/8-11 17/32 3/4-16 11/16
3/4-10 21/32 7/8-14 13/16
7/8-9 49/64 1"-12 59/64
1"-8 7/8 1"-14 15/16
1 1/8-7 63/64 1 1/8-12 1-3/64
1 1/4-7 1-7/64 1 1/4-12 1-11/64
1 3/8-6 1-7/32 1 3/8-12 1-19/64
1 1/2-6 1-11/32 1 1/2-12 1-27/64
(Metric) Coarse Thread (Metric) Fine Thread
Dia-Thr Drill Sizes Dia-Thr Drill Sizes
M1.6 x 0.35 M1.25 M3 x 0.35 M2.60
M2 x 0.4 M1.60 M4 x 0.5 M3.50
M2.5x0.45 M2.05 M5 x 0.5 M4.50
M3 x 0.5 M2.50 M6 x .75 M5.20
M3.5 x 0.6 M2.90 M8 x .75 M7.20
M4 x 0.7 M3.30 M8 x 1 M7.00
M4.5x0.75 M3.80 M10 x .75 M9.20
M5 x 0.8 M4.20 M10 x 1 M9.00
M6 x 1 M5.00 M10 x 1.25 M8.80
M7 x 1 M6.00 M12 x 1 M11.00
M8 x 1.25 M6.80 M12 x 1.25 M10.80
M10 x 1.5 M8.50 M12 x 1.5 M10.50
M12 x 1.75 M10.20 M14 x 1.25 M12.80
M14 x 2 M12.00 M14 x 1.5 M12.50
M16 x 2 M14.00 M16 x 1 M15.00
M18 x 2.5 M15.50 M16 x 1.5 M14.50
M20 x 2.5 M17.50 M18 x 1.5 M16.50
M24 x 3 M21.00 M20 x 1 M19.00
M27 x 3 M24.00 M20 x 1.5 M18.50
M30 x 3.5 M26.50 M20 x 2 M18.00
M33 x 3.5 M29.50 M22 x 1.5 M20.50
M36 x 4 M32.00 M24 x 1.5 M22.50  
  M24 x 2 M22.00