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Westfield Fasteners Product Specification:

DIN 1587 - Dome Nuts

This product guide contains the specification for metric threaded Dome Nuts, a series of standard parts available from Westfield Fasteners. The basis of this specification is the DIN standard DIN 1587.

Product Description

A popular nut used in applications where aesthetics are important, giving an attractive look. The domed top also ensures a smooth snag-free finish protecting both the fixing and any foreign body that may come into contact. Also known as an Acorn Nut, a version incorporating a nylon insert is also available, manufactured to DIN 986.

Scope of the DIN standard.

DIN 1587 specifies the dimensions and tolerances for coarse and fine pitch threads for hexagon domed cap nuts, with nominal diameters from M4 up to and including M24. Table 1 below defines these dimensions and tolerances. DIN 1587 covers steel, stainless steel and brass materials.

Table 1: Dimensions & Tolerances according to DIN 1587 (mm)

Thread, D	M4	M5	M6	M8	M10	M12	M14	M16	M18	M20	M22	M24
p	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3
d_a	max	4.60	5.75	6.75	8.75	10.80	13.00	15.10	17.30	19.50	21.60	23.70	25.90
min	4.00	5.00	6.00	8.00	10.00	12.00	14.00	16.00	18.00	20.00	22.00	24.00
d_k	max	6.5	7.5	9.5	12.5	15.0	17.0	20.0	23.0	26.0	28.0	33.0	34.0
d_w	min	5.9	6.9	8.9	11.6	14.6	16.6	19.6	22.5	24.9	27.7	31.4	33.3
e	Product Grade A	min	7.66	8.79	11.05	14.38	17.77	20.03	23.35	26.75	30.14	33.53	37.72	39.92
Product Grade B	max	7.50	8.63	10.89	14.20	17.59	19.85	22.78	26.17	29.56	32.95	37.29	39.55
x	max	1.4	1.6	2.0	2.5	3.0	3.5	4.0	4.0	5.0	5.0	5.0	6.0
g₂	max	2.75	3	3.7	4.9	5.6	6.4	7.3	7.3	9.3	9.3	9.3	10.7
h	nom=max	8	10	12	15	18	22	25	28	32	34	39	42
Product Grade A	min	7.64	9.64	11.57	14.57	17.57	21.48	24.48	27.48	31.38	33.38	38.38	41.38
Product Grade B	min	7.42	9.42	11.30	14.30	17.30	21.16	24.16	27.16	31.00	33.00	38.00	41.00
m	min	3.20	4.00	5.00	6.50	8.00	10.00	11.00	13.00	15.00	16.00	18.00	19.00
max	2.90	3.70	4.70	6.14	7.64	9.64	10.30	12.30	14.30	14.90	16.90	17.70
r	(auxiliary dimensions)	3.25	3.75	4.75	6.24	7.50	8.50	10.00	11.50	13.00	14.00	16.50	17.00
s	nom=max	7	8	10	13	16	18	21	24	27	30	34	36
Product Grade A	min	6.78	7.78	9.78	12.73	15.73	17.73	20.67	23.67	26.67	29.67	33.38	35.38
Product Grade B	min	6.64	7.64	9.64	12.57	15.57	17.57	20.16	23.16	26.16	29.16	33.00	35.00
t	max	5.74	7.79	8.29	11.35	13.35	16.35	18.35	21.42	25.42	26.42	29.42	31.50
min	5.26	7.21	7.71	10.65	12.65	15.65	17.65	20.58	24.58	25.58	28.58	30.50
w	min	2	2	2	2	2	3	4	4	5	5	5	6

Thread, D

M10

M12

M14

M16

M18

M20

M22

M24

0.7

0.8

1.25

1.5

1.75

2.5

d_a

max

4.60

5.75

6.75

8.75

10.80

13.00

15.10

17.30

19.50

21.60

23.70

25.90

min

4.00

5.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

20.00

22.00

24.00

d_k

max

6.5

7.5

9.5

12.5

15.0

17.0

20.0

23.0

26.0

28.0

33.0

34.0

d_w

min

5.9

6.9

8.9

11.6

14.6

16.6

19.6

22.5

24.9

27.7

31.4

33.3

Product Grade A

min

7.66

8.79

11.05

14.38

17.77

20.03

23.35

26.75

30.14

33.53

37.72

39.92

Product Grade B

max

7.50

8.63

10.89

14.20

17.59

19.85

22.78

26.17

29.56

32.95

37.29

39.55

max

1.4

1.6

2.0

2.5

3.0

3.5

4.0

5.0

6.0

g₂

max

2.75

3.7

4.9

5.6

6.4

7.3

9.3

10.7

nom=max

Product Grade A

min

7.64

9.64

11.57

14.57

17.57

21.48

24.48

27.48

31.38

33.38

38.38

41.38

Product Grade B

min

7.42

9.42

11.30

14.30

17.30

21.16

24.16

27.16

31.00

33.00

38.00

41.00

min

3.20

4.00

5.00

6.50

8.00

10.00

11.00

13.00

15.00

16.00

18.00

19.00

max

2.90

3.70

4.70

6.14

7.64

9.64

10.30

12.30

14.30

14.90

16.90

17.70

(auxiliary dimensions)

3.25

3.75

4.75

6.24

7.50

8.50

10.00

11.50

13.00

14.00

16.50

17.00

nom=max

Product Grade A

min

6.78

7.78

9.78

12.73

15.73

17.73

20.67

23.67

26.67

29.67

33.38

35.38

Product Grade B

min

6.64

7.64

9.64

12.57

15.57

17.57

20.16

23.16

26.16

29.16

33.00

35.00

max

5.74

7.79

8.29

11.35

13.35

16.35

18.35

21.42

25.42

26.42

29.42

31.50

min

5.26

7.21

7.71

10.65

12.65

15.65

17.65

20.58

24.58

25.58

28.58

30.50

min

Table 1 Continued

Thread, Dxp	M8x1	M10x1.25, M10x1	M12x1.5, M12x1.25	M14x1,5	M16x1.5	M18x2, M18x1.5	M20x2, M20x1.5	M22x2, M22x1.5	M24x2
d_a	max	8.75	10.80	13.00	15.10	17.30	19.50	21.60	23.70	25.90
min	8.00	10.00	12.00	14.00	16.00	18.00	20.00	22.00	24.00
d_k	min	12.5	15.0	17.0	20.0	23.0	26.0	28.0	33.0	34.0
d_w	min	11.6	14.6	16.6	19.6	22.5	24.9	27.7	31.4	33.3
e	Product Grade A	min	14.38	17.77	20.03	23.35	26.75	30.14	33.53	37.72	39.98
Product Grade B	min	14.20	17.59	19.85	22.78	26.17	29.56	32.95	37.29	39.55
x	max	2.0	2.5	3.0	3.0	3.0	4.0	4.0	4.0	4.0
g₂	max	3.7	4.9	5.6	5.6	5.6	7.3	7.3	7.3	7.3
h	nom=max	15	18	22	25	28	32	34	39	42
Product Grade A	min	14.57	17.57	21.48	24.48	27.48	31.38	33.38	38.38	41.38
Product Grade B	min	14.30	17.30	21.16	24.16	27.16	31.00	33.00	38.00	41.00
m	max	6.50	8.00	10.00	11.00	13.00	15.00	16.00	18.00	19.00
min	6.14	7.64	9.64	10.30	12.30	14.30	14.90	16.90	17.70
r	(auiliary dimensions)	6.25	7.50	8.50	10.00	11.50	13.00	14.00	16.50	17.00
s	nom=max	13	16	18	21	24	27	30	34	36
Product Grade A	min	12.73	15.73	17.73	20.67	23.67	26.67	29.67	33.38	35.38
Product Grade B	min	12.57	15.57	17.57	20.16	23.16	26.16	29.16	33.00	35.00
t	max	11.35	13.35	16.35	18.35	21.42	25.42	26.42	29.42	31.50
min	10.5	12.65	15.65	17.65	20.58	24.58	25.58	28.58	30.50
w	min	2	2	3	4	4	5	5	5	6

Thread, Dxp

M8x1

M10x1.25, M10x1

M12x1.5, M12x1.25

M14x1,5

M16x1.5

M18x2, M18x1.5

M20x2, M20x1.5

M22x2, M22x1.5

M24x2

d_a

max

8.75

10.80

13.00

15.10

17.30

19.50

21.60

23.70

25.90

min

8.00

10.00

12.00

14.00

16.00

18.00

20.00

22.00

24.00

d_k

min

12.5

15.0

17.0

20.0

23.0

26.0

28.0

33.0

34.0

d_w

min

11.6

14.6

16.6

19.6

22.5

24.9

27.7

31.4

33.3

Product Grade A

min

14.38

17.77

20.03

23.35

26.75

30.14

33.53

37.72

39.98

Product Grade B

min

14.20

17.59

19.85

22.78

26.17

29.56

32.95

37.29

39.55

max

2.0

2.5

3.0

4.0

g₂

max

3.7

4.9

5.6

7.3

nom=max

Product Grade A

min

14.57

17.57

21.48

24.48

27.48

31.38

33.38

38.38

41.38

Product Grade B

min

14.30

17.30

21.16

24.16

27.16

31.00

33.00

38.00

41.00

max

6.50

8.00

10.00

11.00

13.00

15.00

16.00

18.00

19.00

min

6.14

7.64

9.64

10.30

12.30

14.30

14.90

16.90

17.70

(auiliary dimensions)

6.25

7.50

8.50

10.00

11.50

13.00

14.00

16.50

17.00

nom=max

Product Grade A

min

12.73

15.73

17.73

20.67

23.67

26.67

29.67

33.38

35.38

Product Grade B

min

12.57

15.57

17.57

20.16

23.16

26.16

29.16

33.00

35.00

max

11.35

13.35

16.35

18.35

21.42

25.42

26.42

29.42

31.50

min

10.5

12.65

15.65

17.65

20.58

24.58

25.58

28.58

30.50

min

DIN 1587 - Dome Nuts

Figure 1: Dome Nut

Table 1: Dimensions & Tolerances according to DIN 1587 (mm)

Table 1 Continued