Westfield Fasteners Product Specification:

ISO 4017 - Hex Head Set Screw (Fully Threaded Hex Bolt)

This product guide contains the specification for metric threaded Hex Head Set Screws, a series of standard parts available from Westfield Fasteners. The basis of this specification is the internationally recognised ISO standard ISO 4017.

Product Description

Commonly referred to as a set screw or simply as a bolt. The fully threaded hex head set screw is distinct from it's partially threaded Hex Bolt counterpart. A standard spanner or ratchet is typically used to secure this fastener. Used for decades on all types of assembly throughout the world. The hex head drive allows a higher torque to be applied over other drive systems. This newer standard ISO 4017 specifies differences in head dimensions for M10, M12, M14 and M22 thread diameters over the older DIN 933 standard.

Scope of the ISO Standard

ISO standard ISO 4017 specifies the characteristics, tolerances and variation in form of metric sized hex head set screws, and covers thread diameters from M1.6 up to and including M64. Mechanical properties for these items are defined in ISO 898 and ISO 3506. Table 1 below defines the overall dimensions and tolerances for hexagon head set screws, whilst table 2 defines the same for what are considered non-preferred threads. Table 3 defines the tolerance on the shank length.

ISO 4017 has specific provision for mild steel, 8.8 and 10.9 hi-tensile steel, stainless steel and non ferrous metals, which may include brass.

ISO 4017 is based on and supercedes DIN 933. Despite this, off the shelf parts are still widely available and often produced to the older standard.

Notes to figure 1:

Point (b) is chamfered or for threads equal to or greater than M4, it may be as-rolled (sheared end).
There may be up to 2 incomplete threads at the end of the bolt (c).
d - reference datum for dw.
ds pitch diameter (e).
Permissible alternative shape (f).

Variations from ISO 4017

ISO 4014 is an equivalent standard, covering hex head bolts with a partially threaded shank.

Table 1: Dimensions & Tolerances according to ISO 4017 (Preferred Threads)

Thread, d	M1.6	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	M16	M20	M24	M30	M36	M42	M48	M56	M64
p	0.35	0.4	0.45	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2.5	3	3.5	4	4.5	5	5.5	6
a	max	1.05	1.20	1.35	1.5	2.1	2.4	3	4	4.5	5.3	6	7.5	9	10.5	12	13.5	15	16.5	18
min	0.35	0.40	0.45	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2.5	3	3.5	4	4.5	5	5.5	6
c	max	0.25	0.25	0.25	0.40	0.40	0.50	0.50	0.60	0.60	0.60	0.80	0.80	0.80	0.80	0.80	1.00	1.00	1.00	1.00
min	0.10	0.10	0.10	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.20	0.20	0.20	0.20	0.20	0.30	0.30	0.30	0.30
d_a	max	2.0	2.6	3.1	3.6	4.7	5.7	6.8	9.2	11.2	13.7	17.7	22.4	26.4	33.4	39.4	45.6	52.6	63	71
d_w	Product grade	A	min	2.27	3.07	4.07	4.57	5.88	6.88	8.88	11.63	14.63	16.63	22.49	28.19	33.61	-	-	-	-	-	-
B	2.30	2.95	3.95	4.45	5.74	6.74	8.74	11.47	14.47	16.47	22.00	27.70	33.25	42.75	51.11	59.95	69.45	78.66	88.16
e	Product grade	A	min	3.41	4.32	5.45	6.01	7.66	8.79	11.05	14.38	17.77	20.03	26.75	33.53	39.98	-	-	-	-	-	-
B	3.28	4.18	5.31	5.88	7.50	8.63	10.89	14.20	17.59	19.85	26.17	32.95	39.55	50.85	60.79	71.30	82.60	93.56	104.86
k	-	-	nom	1.1	1.4	1.7	2	2.8	3.5	4	5.3	6.4	7.5	10	12.5	15	18.7	22.5	26	30	35	40
Product grade	A	max	1.225	1.525	1.825	2.125	2.925	3.65	4.15	5.45	6.58	7.68	10.18	12.715	15.215	-	-	-	-	-	-
min	0.975	1.275	1.575	1.875	2.675	3.35	3.85	5.15	6.22	7.32	9.82	12.285	14.785	-	-	-	-	-	-
Product grade	B	max	1.30	1.60	1.90	2.20	3.00	3.74	4.24	5.54	6.69	7.79	10.29	12.85	15.35	19.12	22.92	26.42	30.42	35.5	40.5
min	0.90	1.20	1.50	1.80	2.60	3.26	3.76	5.06	6.11	7.21	9.71	12.15	14.65	18.28	22.08	25.58	29.58	34.5	39.5
k_w	Product grade	A	min	0.68	0.89	1.10	1.31	1.87	2.35	2.70	3.61	4.35	5.12	6.87	8.6	10.35	-	-	-	-	-	-
B	min	0.63	0.84	1.05	1.26	1.82	2.28	2.63	3.54	4.28	5.05	6.8	8.51	10.26	12.8	15.46	17.91	20.71	24.15	27.65
r	-	-	min	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.4	0.4	0.6	0.6	0.8	0.8	1	1	1.2	1.6	2	2
s	-	-	nom=max	3.2	4	5	5.5	7	8	10	13	16	18	24	30	36	46	55	65	75	85	95
Product grade	A	min	3.02	3.82	4.82	5.32	6.78	7.78	9.78	12.73	15.73	17.73	23.67	29.67	35.38	-	-	-	-	-	-
B	2.90	3.70	4.70	5.20	6.64	7.64	9.64	12.57	15.57	17.57	23.16	29.16	35.00	45.0	53.8	63.1	73.1	82.8	92.8

Thread, d

M1.6

M2.5

M10

M12

M16

M20

M24

M30

M36

M42

M48

M56

M64

0.35

0.4

0.45

0.5

0.7

0.8

1.25

1.5

1.75

2.5

3.5

4.5

5.5

max

1.05

1.20

1.35

1.5

2.1

2.4

4.5

5.3

7.5

10.5

13.5

16.5

min

0.35

0.40

0.45

0.5

0.7

0.8

1.25

1.5

1.75

2.5

3.5

4.5

5.5

max

0.25

0.40

0.50

0.60

0.80

1.00

min

0.10

0.15

0.20

0.30

d_a

max

2.0

2.6

3.1

3.6

4.7

5.7

6.8

9.2

11.2

13.7

17.7

22.4

26.4

33.4

39.4

45.6

52.6

d_w

Product grade

min

2.27

3.07

4.07

4.57

5.88

6.88

8.88

11.63

14.63

16.63

22.49

28.19

33.61

2.30

2.95

3.95

4.45

5.74

6.74

8.74

11.47

14.47

16.47

22.00

27.70

33.25

42.75

51.11

59.95

69.45

78.66

88.16

Product grade

min

3.41

4.32

5.45

6.01

7.66

8.79

11.05

14.38

17.77

20.03

26.75

33.53

39.98

3.28

4.18

5.31

5.88

7.50

8.63

10.89

14.20

17.59

19.85

26.17

32.95

39.55

50.85

60.79

71.30

82.60

93.56

104.86

nom

1.1

1.4

1.7

2.8

3.5

5.3

6.4

7.5

12.5

18.7

22.5

Product grade

max

1.225

1.525

1.825

2.125

2.925

3.65

4.15

5.45

6.58

7.68

10.18

12.715

15.215

min

0.975

1.275

1.575

1.875

2.675

3.35

3.85

5.15

6.22

7.32

9.82

12.285

14.785

Product grade

max

1.30

1.60

1.90

2.20

3.00

3.74

4.24

5.54

6.69

7.79

10.29

12.85

15.35

19.12

22.92

26.42

30.42

35.5

40.5

min

0.90

1.20

1.50

1.80

2.60

3.26

3.76

5.06

6.11

7.21

9.71

12.15

14.65

18.28

22.08

25.58

29.58

34.5

39.5

k_w

Product grade

min

0.68

0.89

1.10

1.31

1.87

2.35

2.70

3.61

4.35

5.12

6.87

8.6

10.35

min

0.63

0.84

1.05

1.26

1.82

2.28

2.63

3.54

4.28

5.05

6.8

8.51

10.26

12.8

15.46

17.91

20.71

24.15

27.65

min

0.1

0.2

0.25

0.4

0.6

0.8

1.2

1.6

nom=max

3.2

5.5

Product grade

min

3.02

3.82

4.82

5.32

6.78

7.78

9.78

12.73

15.73

17.73

23.67

29.67

35.38

2.90

3.70

4.70

5.20

6.64

7.64

9.64

12.57

15.57

17.57

23.16

29.16

35.00

45.0

53.8

63.1

73.1

82.8

92.8

Table 2: Dimensions & Tolerances according to ISO 4017 (Non-Preferred Threads)

Thread, d	M3.5	M14	M18	M22	M27	M33	M39	M45	M52	M60
p	0.6	2	2.5	2.5	3	3.5	4	4.5	5	5.
a	max	1.8	6	7.5	7.5	9	10.5	12	13.5	15	16.5
min	0.6	2	2.5	2.5	3	3.5	4	4.5	5	5.5
c	max	0.40	0.60	0.80	0.80	0.80	0.8	1.0	1.0	1.0	1.0
min	0.15	0.15	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3
d_a	max	4.1	15.7	20.2	24.4	30.4	36.4	42.4	48.6	56.6	67
d_w	Product grade	A	min	5.07	19.64	25.34	31.71	-	-	-	-	-	-
B	4.95	19.15	24.85	31.35	38.0	46.55	55.86	64.70	74.2	83.41
e	Product grade	A	min	6.58	23.36	30.14	37.72	-	-	-	-	-	-
B	6.44	22.78	29.56	37.29	45.20	55.37	66.44	76.95	88.25	99.21
k	-	-	nom	2.4	8.8	11.5	14	17	21	25	28	33	38
Product grade	A	max	2.525	8.980	11.715	14.215	-	-	-	-	-	-
min	2.275	8.620	11.285	13.785	-	-	-	-	-	-
Product grade	B	max	2.60	9.09	11.85	14.35	17.35	21.42	25.42	28.42	33.50	38.5
min	2.20	8.51	11.15	13.65	16.65	20.58	24.58	27.58	32.50	37.5
k_w	Product grade	A	min	1.59	6.03	7.90	9.65	-	-	-	-	-	-
B	1.54	5.96	7.81	9.56	11.66	14.41	17.21	19.31	22.75	26.25
r	-	-	min	0.1	0.6	0.6	0.8	1	1	1	1.2	1.6	2
s	-	-	nom=max	6	21	27	34	41	50	60	70	80	90
Product grade	A	min	5.82	21.67	26.67	33.38	-	-	-	-	-	-
B	5.70	21.16	26.16	33.00	40.00	49.0	58.8	68.1	78.1	87.8

Thread, d

M3.5

M14

M18

M22

M27

M33

M39

M45

M52

M60

0.6

2.5

3.5

4.5

max

1.8

7.5

10.5

13.5

16.5

min

0.6

2.5

3.5

4.5

5.5

max

0.40

0.60

0.80

0.8

1.0

min

0.15

0.2

0.3

d_a

max

4.1

15.7

20.2

24.4

30.4

36.4

42.4

48.6

56.6

d_w

Product grade

min

5.07

19.64

25.34

31.71

4.95

19.15

24.85

31.35

38.0

46.55

55.86

64.70

74.2

83.41

Product grade

min

6.58

23.36

30.14

37.72

6.44

22.78

29.56

37.29

45.20

55.37

66.44

76.95

88.25

99.21

nom

2.4

8.8

11.5

Product grade

max

2.525

8.980

11.715

14.215

min

2.275

8.620

11.285

13.785

Product grade

max

2.60

9.09

11.85

14.35

17.35

21.42

25.42

28.42

33.50

38.5

min

2.20

8.51

11.15

13.65

16.65

20.58

24.58

27.58

32.50

37.5

k_w

Product grade

min

1.59

6.03

7.90

9.65

1.54

5.96

7.81

9.56

11.66

14.41

17.21

19.31

22.75

26.25

min

0.1

0.6

0.8

1.2

1.6

nom=max

Product grade

min

5.82

21.67

26.67

33.38

5.70

21.16

26.16

33.00

40.00

49.0

58.8

68.1

78.1

87.8

mm	+/-
Product grade
A	B
2-3	0.2	-
4-6	0.24	-
8-10	0.29	-
12-16	0.35	-
20-30	0.42	1.05
35-50	0.5	1.25
55-80	0.6	1.5
90-120	0.7	1.75
130-150	0.8	2
160-180	-	2
200	-	2.3

+/-

Product grade

2-3

0.2

4-6

0.24

8-10

0.29

12-16

0.35

20-30

0.42

1.05

35-50

0.5

1.25

55-80

0.6

1.5

90-120

0.7

1.75

130-150

0.8

160-180

200

2.3

ISO 4017 - Hex Head Set Screw (Fully Threaded Hex Bolt)

Figure 1: Hexagon Head Set Screw ISO 4017

Table 1: Dimensions & Tolerances according to ISO 4017 (Preferred Threads)

Table 2: Dimensions & Tolerances according to ISO 4017 (Non-Preferred Threads)

Table 3: Shank Length Tolerance according to ISO 4017