2024_09_02_RECA-UK Catalogue_August_2024

Reference Table

Drill sizes for metric coarse taps.

Thread Diameter Ø

Drill Diameter Ø

Thread Diameter Ø

Drill Diameter Ø

M2

1.6mm 1.75mm 2.05mm 2.5mm 2.9mm 3.3mm 4.2mm 5.0mm 5.0mm

M7 M8 M9

6.0mm 6.6mm 7.8mm 8.5mm 9.5mm 10.2mm 12.0mm 14.0mm 15.5mm

Thread Diameter Ø

Drill Diameter Ø

M2.2 M2.5

M20 M22 M24 M27 M30 M33 M36

17.5mm 19.5mm 21.0mm 24.0mm 26.5mm 29.5mm 32.5mm

M3

M10 M11 M12 M14 M16 M18

M3.5

M4 M5 M6 M6

Cutting Speeds Factors which determine the best speed to use in any drilling operations are:

1. Type of material being worked. 2. Diameter of hole. 3. Type of drill. 4. Quality of cut desired.

Generally, the smaller the drill the greater the required RPM. In soft material, the speed should be higher than for hard metals. The drill speed for a given drill bit size is according to the table below.

Speed Range (RPM)

7240

1410-2270 970-1280 480-580 250-400

180

Sizes in imperial, then metric below

3/8 9.5 1/4 6.4

5/8

7/8

1 1/4 31.75

1 1/5 41.4

2

Wood

18

22

50.8

3/8 9.5

1/2

3/4

7/8

1

Zinc Diecast

12.5

19

22

25.4

7/32

11/32

15/32

11/16

3/4

Alum & Brass

5.6

8.75 5/16

12

17.5

19

3/16

7/16

5/8

13/16

Plastic

4.8 1/8 3.2

7.9 1/4 6.4

11

16

20.5

11/32

1/2

5/8

Cast Iron & Bronze

8.75

12.5

16

3/32

5/32

1/4 6.4

3/8 9.5

1/2

Mild Steel & Malleable

2.4

4

12.5 7/16

1/16

1/8 3.2

3/16

5/16

9/16 14.5

Cast Steel & Med Carbon Stainless and Tool Steel

1.6

4.8 1/8 3.2

7.9 1/4 6.4

11

3/64

1/16

3/8 9.5

1/2

1.2

1.6

12.5

07 10 - Reproduction, even in part prohibited. Printed in UK Modified: 21 August 2024 07 10

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