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Recommended Tapping Drill Size

ISO Metric Coarse

Size (mm) Pitch (mm) Drill (mm)
M1 .25 .75
M1.1 .25 .85
M1.2 .25 .95
M1.4 .3 1.1
M1.6 .35 1.25
M1.8 .35 1.45
M2 .4 1.6
M2.2 .45 1.75
M2.5 .45 2.05
M3 .5 2.5
M3.5 .6 2.9
M4 .7 3.3
M4.5 .75 3.75
M5 .8 4.2
M6 1 5
M7 1 6
M8 1.25 6.75
M9 1.25 7.75
M10 1.5 8.5
M11 1.5 9.5
M12 1.75 10.2
M14 2 12
M16 2 14
M18 2.5 15.5
M20 2.5 17.5
M22 2.5 19.5
M24 3 21
M27 3 24
M30 3.5 26.5
M33 3.5 29.5
M36 4 32
M39 4 35
M42 4.5 37.5
M45 4.5 40.5
M48 5 43
M52 5 47
M56 5.5 50.5
M60 5.5 54.5
M64 6 58
M68 6 62
M72 6 66
M76 6 70

UNC

Size No.
or inch		 Pitch
TPI		 Drill (mm)
#1 64 1.55
#2 56 1.85
#3 48 2.1
#4 40 2.35
#5 40 2.65
#6 32 2.85
#8 32 3.5
#10 24 3.9
#12 24 4.5
1/4 20 5.1
5/16 18 6.6
3/8 16 8
7/16 14 9.4
1/2 13 10.8
9/16 12 12.2
5/8 11 13.5
3/4 10 16.5
7/8 9 19.5
1 8 22.25
1 1/8 7 25
1 1/4 7 28
1 3/8 6 30.75
1 1/2 6 34
1 3/4 5 39.5
2 4.5 45
2 1/4 4.5 51.5
2 1/2 4 57.25
2 3/4 4 63.5
3 4 70

UNF

Size No.
or inch		 Pitch
TPI		 Drill (mm)
#0 80 1.25
#1 72 1.55
#2 64 1.9
#3 56 2.15
#4 48 2.4
#5 44 2.7
#6 40 2.95
#8 36 3.5
#10 32 4.1
#12 28 4.7
1/4 28 5.5
5/16 24 6.9
3/8 24 8.5
7/16 20 9.9
1/2 20 11.5
9/16 18 12.9
5/8 18 14.5
3/4 16 17.5
7/8 14 20.4
1 12 23.25
1 1/8 12 26.5
1 1/4 12 29.5
1 3/8 12 32.75
1 1/2 12 36

 

ISO Metric Fine

Size (mm) Pitch (mm) Drill (mm)
M2 .25 1.75
M2.2 .25 1.95
M2.3 .25 2.05
M2.5 .35 2.15
M2.6 .35 2.25
M3 .35 2.65
M3.5 .35 3.15
M4 .35 3.65
M4 .5 3.5
M5 .35 4.65
M5 .5 4.5
M5 .75 4.25
M5.5 .5 5
M6 .5 5.5
M6 .75 5.25
M7 .75 6.25
M8 .5 7.5
M8 .75 7.25
M8 1 7
M9 .75 8.25
M9 1 8
M10 .5 9.5
M10 .75 9.25
M10 1 9
M10 1.25 8.75
M11 .75 10.25
M11 1 10
M11 1.25 9.75
M12 .5 11.5
M12 .75 11.25
M12 1 11
M12 1.25 10.75
M12 1.5 10.5
M14 1 13
M14 1.25 12.75
M14 1.5 12.5
M15 .75 14.25
M15 1 14
M15 1.5 13.5
M16 .5 15.5
M16 .75 15.25
M16 1 15
M16 1.25 14.75
M16 1.5 14.5
M17 1 16
M17 1.5 15.5
M18 .75 17.25
M18 1 17
M18 1.25 16.75
M18 1.5 16.5
M18 2 16
M19 1 18
M20 1 19
M20 1.5 18.5
M20 2 18
M22 1 21
M22 1.5 20.5
M22 2 20
M24 1 23
M24 1.5 22.5
M24 2 22
M25 1 24
M25 1.5 23.5
M25 2 23
M27 1 26
M27 1.5 25.5
M27 2 25
M28 1 27
M28 1.5 26.5
M28 2 26
M30 1 29
M30 1.5 28.5
M30 2 28
M30 3 27
M32 1 31
M32 1.5 30.5
M32 2 30
M33 1.5 31.5
M33 2 31
M33 3 30
M35 1.5 33.5
M35 2 33
M35 3 32
M36 1 35
M36 1.5 34.4
M36 2 34
M36 3 33
M38 1 37
M38 1.5 36.5
M38 2 36
M39 1.5 37.5
M39 2 37
M39 3 36
M40 1 39
M40 1.5 38.5
M40 3 37
M42 1.5 40.5
M42 2 40
M42 3 39
M42 4 38
M45 1.5 43.5
M45 2 43
M45 3 42
M48 1.5 46.5
M48 2 46
M48 3 45
M48 4 44
M50 1.5 48.5
M50 2 48
M50 3 47
M52 1.5 50.5
M52 2 50
M52 3 49
M52 4 48
M56 2 54
M56 4 52

*All information is strictly informative
  Contact us
 

         Company Name: Hengsin Industrial Co.,Ltd.
         Contact Person: Martin Wang.
         Address: 310-5-#55, Zhanongkou Xincun, Jianggan District,Hangzhou,China 310004
         Zip: 310004
         Tel:86-571-82760351
         Mobile:86-131-75103386
         Fax:86-571-86973903
         Email:sales@fasteners.cc
         Email2:Martinwangke@yahoo.com.cn

 		 
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