TAPPING DRILL SIZES - Prescott Engineering

TAPPING DRILL SIZES

IMPERIAL THREADS

B.S Whit Drill Size Tap Size

1/16 3/32 1/8 5/32 3/16 7/32 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 1' 1-1/8

1-1/4 1-3/8 1-1/2

1-5/8 1-3/4 2"

1.1mm 1.8mm 2.5mm 2.9mm 3.7mm 4.2mm 13/64 1/4 5/16 23/64 13/32 15/32 17/32 19/32 21/32 23/32 3/4 55/64 63/64

1-3/32 1-13/64 1-11/32

1-7/16 1-17/32 1-49/64

U.N.F

Drill Size

U.N.C

Drill Size

B.S.F

B.S.P

Drill Size Drill Size

B.A

Tap Size

Drill Size

0

5.1mm

7/32 I 21/64 25/64 29/64 33/64 37/64

11/16

13/16 15/16 1-3/64 1-11/64 1-19/64 1-27/64

1/8

4.4mm 13/64 6.5mm 5/16 9.3mm 27/64 31/64 17/32 19/32 21/32 23/32 49/64 7/8 63/64 1-7/64 1-13/64 1-11/32

1-9/16 1-25/32

5/32

5.3mm 17/64 21/64 3/8 7/16 1/2 35/64 39/64 43/64 47/64 25/32 57/64 1-1/64

1-9/64 1-1/4 123/64 1-1/2 1-19/32 1-27/32

11/32 1

2

15/32 3 4

19/32 5

6

3/4

7

8 53/64 9

31/32 10

11

1-1/8

12

1-7/32

1-9/16 1-51/64

2-1/32 2-17/64

4.5mm

5/32

3.4mm 3.0mm 2.6mm 2.3mm 2.0mm 1.8mm 1.5mm

1.4mm 3/64 1.0mm

METRIC THREADS

Tap size Pitch

M 1.0 .25

M 1.0 .20

M 1.5 .35

M 2.0 .40

M 2.2 .45

M 2.25 .50

M 2.3 .40

M 2.5 .35

M 2.5 .45

M 2.6 .45

M 3.0 .50

M 3.0 .60

M 3.5 .60

M 3.6 .75

M 3.8 .35

M 4.0 .70

M 4.5 .50

M 4.5 .75

M 5.0 .50

M 5.0 .75

M 5.0 .80

M 5.5 .90

M 5.0 1.0

M 5.5 .75

M 5.5 90

M 6

.75

M 6

1.0

M 6

1.25

M 7

.5

M 7

.75

M 7

1.0

M 7

1.25

M 8

.75

M 8

1.0

M 8

1.25

M 9

.75

M 9

1.0

M 9

1.25

M 10

.75

M 10

1.0

M 10 1.25

M 10

1.5

M 11

1

M 11 1.25

M 11

1.5

M 12

1

M 12 1.25

M 12

1.5

M 12 1.75

M 13

1.5

M 13 1.75

M 13

2.0

M 14 1.25

Tapping Drill

1.11mm 1.1mm 1.15mm 1.6mm 1.5mm 1.9mm 1.9mm 2.0mm 2.0mm 2.1mm 2.5mm 2.4mm 2.90mm 2.25mm 2.7mm 3.30mm 4.0mm 3.75mm 4.5mm 4.25mm 4.20mm 4.1mm 4.0mm

4.75 4.6 5.2mm 5.0mm 4.8mm 6.0mm 6.2mm 6.00mm 5.8mm 6.5mm 7.00mm 6.80mm 6.25mm 8.0mm 7.80mm 9.0mm 9.00mm 8.80mm 8.50mm 10.0mm 9.8mm 9.50mm 11.25mm 11.0mm 10.5mm 10.3mm 11.5mm 11.5mm 11.0mm 12.80mm

M 14

1.5

M 14

2.0

M 16

1.5

M 16

2.0

M 18

1.5

M 18

2.5

M 20

1.5

M 20

2.5

M 22

1.5

M 22

2.5

M 24

2.0

M 24

3.0

M 27

3.0

M 30

3.5

M 33

3.5

M 36

4.0

12.50mm 12.00mm 14.5mm 14.0mm 16.5mm 15.5mm 18.5mm 17.5mm 20.5mm 19.5mm 22.0mm 21.0mm 24.0mm 26.5mm 29.5mm 32.0mm

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