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Home / Products / Screws / Tapping Screws / ASME/ANSI B18.6.5M (T21):2000 Metric Hex Head Flange Tapping Screw

ASME/ANSI B18.6.5M (T21):2000 Metric Hex Head Flange Tapping Screw

ASME/ANSI B18.6.5M (T21):2000 Metric Hex Head Flange Tapping Screw adopts metric dimensions, an external hex head, and a flange bearing surface to meet the needs of light engineering applications requiring broad contact area, fast socket installation, and tapping capability.

The flange distributes clamping load and reduces indentation on sheet metal or brackets, while the tapping thread forms its mating thread in a pilot hole. Its advantages lie in a clear installation method, well-defined load path, and good adaptability across different materials and installation spaces.

This product is suitable for metal panels, equipment brackets, vehicle accessories, HVAC systems, and industrial housings. Zinc plating, stainless steel, or corrosion-resistant coatings can be adjusted for the final application, balancing cost control, corrosion protection, and assembly consistency.

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Dimensions unit: inch 

Thread size d

ST2.2

ST2.9

ST3.5

ST4.2

ST4.8

ST5.5

ST6.3

ST8

ST9.5

P

Pitch

0.8

1

1.3

1.4

1.6

1.8

1.8

2.1

2.1

s

Max.

3

4

5

5.5

7

7

8

10

13

Min.

2.84

3.84

4.82

5.32

6.78

6.78

7.78

9.78

12.72

e

Min.

3.16

4.27

5.36

5.92

7.55

7.55

8.66

10.89

14.16

dk

Max.

4.5

6.4

7.5

8.5

10

11.2

12.8

16.8

21

Min.

4.1

5.9

6.9

7.8

9.3

10.3

11.8

15.5

19.3

k

Max.

2.2

3.2

3.8

4.3

5.2

6

6.7

8.6

10.7

c

Min.

0.3

0.4

0.5

0.6

0.6

0.8

1

1.2

1.4

r

Min.

0.1

0.1

0.1

0.2

0.2

0.2

0.3

0.4

0.4

b

Min.

13

17

21

25

29

33

38

38

38

Thread and end type

AB,B,BF,BT

AB,B,BF,BT

AB,B,BF,BT

AB,B,BF,BT

AB,B,BF,BT

AB,B,BF,BT

AB,B,BF,BT

AB,B,BF,BT

AB,B,BF,BT

  

Thread size d

M2

M2.5

M3

M3.5

M4

M5

M6

M8

M10

P

Pitch

0.4

0.45

0.5

0.6

0.7

0.8

1

1.25

1.5

s

Max.

3

3.2

4

5

5.5

7

8

10

13

Min.

2.84

3.04

3.84

4.82

5.32

6.78

7.78

9.78

12.72

e

Min.

3.16

3.39

4.27

5.36

5.92

7.55

8.66

10.89

14.16

dk

Max.

4.5

5.4

6.4

7.5

8.5

10.6

12.8

16.8

21

Min.

4.1

5

5.9

6.9

7.8

9.8

11.8

15.5

19.3

k

Max.

2.2

2.7

3.2

3.8

4.3

5.4

6.7

8.6

10.7

c

Min.

0.3

0.3

0.4

0.5

0.6

0.7

1

1.2

1.4

r

Min.

0.1

0.1

0.1

0.1

0.2

0.2

0.3

0.4

0.4

b

Min.

12

15

18

21

24

30

38

38

38

Thread and end type

D,F,T

D,F,T

D,F,T

D,F,T

D,F,T

D,F,T

D,F,T

D,F,T

D,F,T

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