International Materials for self tapping threaded inserts are mainly made of the following Materials

Unhardenedsteel

Casehardened steel,zinc-plated hardenedsteel electrogalvanized

Casehardened steel Domestic self-tapping screw covers are generally made of carbon steel and stainless steel

1, material selection is 45 or 40Cr steel, tempered 250HB-280HB1, carbon steel 121 5: color zinc plating, suitable for aluminum alloy, copper alloy, plastic and other engineering strength of low base material, surface carburizing heat treatment.

2, stainless steel SUS303 (304,316.316L) : suitable for cast iron and other high strength products, surface passivation treatment.

302 Slotted type

Internal thread

Length（mm）

External thread E

Refer Hole Diameter (mm)

MinimumHoleDepth(mm）

Plastic

aluminium alloy

Cast Iron

M2.5*0.45

6

M4.5*0.5

4.0-4.1

4.1-4.2

4.2-4.3

8

M3*0.5

6

M5*0.5

4.5-4.6

4.6-4.7

4.7-4.8

8

M3.5*0.6

8

M6*0.75

5.3-5.4

5.5-5.6

5.6-5.7

10

M4*0.7

8

M6.5*0.75

5.8-5.9

6.0-6.1

6.1-6.2

10

M5*0.8

10

M8*1.0

7.1-7.2

7.3-7.5

7.5-7.6

13

M6*1.0

12

M9*1.0

8.1-8.2

8.3-8.5

8.5-8.6

15

M6*1.0

14

M10*1.5

9.0-9.2

9.2-9.3

9.3-9.4

17

M8*1.25

15

M12*1.5

10.6-10.8

11-11.2

11.2-11.4

18

M10*1.5

18

M14*1.5

12.6-12.8

13.0-13.3

13.2-13.4

22

M12*1.75

22

M16*1.5

14.6-14.8

15.0-15.3

15.2-15.4

26

M14*2.0

24

M18*1.5

16.6-16.8

17.0-17.3

17.2-17.5

28

M16*2.0

22

M20*1.5

18.6-18.8

19.0-19.3

19.2-19.5

27

M18*2.5

24

M22*1.5

20.6-20.8

21.0-21.3

21.2-21.5

29

M20*2.5

27

M26*1.5

24.6-24.8

25.0-25.3

25.2-25.5

32

M22*2.5

30

M26*1.5

24.6-24.8

25.0-25.3

25.2-25.5

36

M24*3.0

30

M30*1.5

28.6-28.8

29.0-29.3

29.2-29.5

36