A2 304 Stainless Steel Hexagon Head Bolt

Technicals: Hexagon Head Bolt

What is a Hexagon Head Bolt?


Bolt is the term used for a partially threaded fastener (bolt with shoulder/ part plain shank bolt), with a head; designed to be used with a nut and washer.

 

Bolts are mechanical fasteners with a male thread and a head, designed to be used with a nut or in a threaded hole to create a clamping load. The primary function of a bolt is to connect two unthreaded components together with a nut. Screws have a smooth, unthreaded body part that acts as a pin to hold the connection against lateral shear forces. The use of cylindrical bore screws is uncommon, and generally reserved for hex head screws, which are screwed fully into the head and have a part containing its own thread; the screw must always be turned to mount the connector. Nuts and bolts use a wide variety of head designs, the most common being hexagonal and square; they are designed to work with the tools used to tighten them. In some cases, the head is designed to lock the screw in place, stopping rotation; a wrench or turning device is only needed to turn the mounting nut. More bolts can be used to add increased holding force, depending on the properties and section size of the adjoining components. See the examples below.

Links

Hexagon Bolt Collection

Haxagon Bolt Collection Link

Hexagon Set Screw Bolt Collection

Haxagon Set Screw Bolt Collection Link

Carriage Coach Dome Roofing Bolt Collection

Carriage Coach Roofing Bolt Product Link

Hexagon Head Bolt and Hexagon Set Screw

A screw turns into something which has been pre threaded with a tap and a bolt joins several materials or components together from both sides of materials joined. A set screw is fully threaded from beneath the head and a bolt is partially threaded (has a part-plain shank beneath the head). Hexagon head screws and hexagon head bolts are the most popular fastener product and are used with the following thread types:

  • Metric Millimetres (mm): European Measurement System,
  • British inch ("): British Standard Whitworth (BSW), British Standard Fine (BSF),
  • British Association (BA) and,
  • American Inch threads: United Coarse (UNC), United Fine (UNF).

Bolts and screws are available in a range of strength classes or grades and materials. Manufacturer's identify the bolt or screw's properties through using letters and/ or symbols and this is a mandatory requirement in the interest of safety and function. 

 

High Strength Friction Grip EN14399

Non-preload hexagon bolting assemblies have to be supplied in accordance with 'British Standards' BS EN 15048. (BAPP PDF)

Preloaded Hexagon bolting assemblies in accordance with BS EN 14399  (BAPP PDF) To adhere to the 'Conformite European', CE marking requirements.

Fasteners will be labelled in accordance with standards and regulatory requirements. The certificates are to prove the material's mechanical properties and certificates to guarantee that the fastener conforms to standards is another way to ensure you are using a fit for purpose fastener. For example

German Institute for Standardisation or Deutsches Institut für Normung or DIN Standards

International Standards Organisation or ISO standards.

 

DIN 931 Metric Hex Bolts Dimensions

 Hexagon Bolt Dimensions DIN931

 

Diameter

Width Across Flat (s)

Head Height (k)

Thread Length

DIN 931

ISO 4014

DIN 931

ISO 4014

DIN 931 Length (in MM)

ISO 4014 Length (in MM)

Min

Max

Min

Max

Min

Max

Min

Max

≥125

>125≥200

≥200

≥125

>125≥200

≥200

M2

3.82

4.00

3.82

4.00

1.28

1.52

1.275

1.525

10

-

-

10

-

-

M3

5.32

5.50

5.32

5.50

1.88

2.12

1.875

2.125

12

-

-

12

-

-

M4

6.78

7.00

6.78

7.00

2.68

2.92

2.675

2.925

14

-

-

14

-

-

M5

7.78

8.00

7.78

8.00

3.35

3.65

3.35

3.65

16

22

-

16

-

-

M6

9.78

10.00

9.78

10.00

3.85

4.15

3.85

4.15

18

24

-

18

-

-

M8

12.73

13.00

12.73

13.00

5.15

5.45

5.15

5.45

22

28

41

22

-

-

M10

16.73

17.00

15.73

16.00

6.22

6.58

6.22

6.58

26

32

45

26

-

-

M12

18.67

19.00

17.73

18.00

7.32

7.68

7.32

7.68

30

36

49

30

-

-

M14

21.67

22.00

20.67

21.00

8.62

8.98

8.62

8.98

34

40

53

34

40

-

M16

23.67

24.00

23.67

24.00

9.82

10.2

9.82

10.18

38

44

57

38

44

-

M18

26.67

27.00

26.67

27.00

11.28

11.7

11.285

11.715

42

48

61

42

48

-

M20

29.67

30.00

29.67

30.00

12.28

12.7

12.285

12.715

46

52

65

46

52

-

M22

31.61

32.00

33.38

34.00

13.78

14.2

13.785

14.215

50

56

69

50

56

69

M24

35.38

36.00

35.38

36.00

14.78

15.2

14.785

15.215

54

60

73

54

60

73

M27

40.00

41.00

40.00

41.00

16.65

17.4

16.65

17.35

60

66

79

60

66

79

M30

45.00

46.00

45.00

46.00

18.28

19.1

18.28

19.12

66

72

85

66

72

85

M33

49.00

50.00

49.00

50.00

20.58

21.4

20.58

21.42

72

78

91

-

78

91

M36

53.80

55.00

53.80

55.00

22.08

22.9

22.08

22.92

78

84

97

-

84

97

M39

58.80

60.00

58.80

60.00

24.58

25.4

24.58

25.42

84

90

103

-

90

103

M42

63.10

65.00

63.10

65.00

25.58

26.4

25.58

26.42

90

96

109

-

96

109

M45

68.10

70.00

68.10

70.00

27.58

28.4

27.58

28.42

96

102

115

-

102

115

M48

73.10

75.00

73.10

75.00

29.58

30.4

29.58

30.42

102

108

121

-

108

121

M52

78.10

80.00

78.10

80.00

32.5

33.5

32.5

33.5

-

116

129

-

116

129

M56

82.80

85.00

82.80

85.00

34.5

35.5

34.5

35.5

-

124

137

-

-

137

M60

87.80

90.00

87.80

90.00

37.5

38.5

37.5

38.5

-

132

145

-

-

145

M64

92.80

95.00

92.80

95.00

39.5

40.5

39.5

40.5

-

140

153

-

-

153

M72

102.80

105.00

--

--

44.5

45.5

--

--

-

156

169

-

-

-

  

Metric Hexagon Bolt Spanner Sizes DIN931

FIXABALL – Specialist Fixings and Fasteners

Spanner Sizes

METRIC - Hexagon Head Bolts/ Sets

Thread Size/ Diameter

Spanner Size

M3 (3mm)

5.5mm

M4 (4mm)

7mm

M5 (5mm)

8mm

M6 (6mm)

10mm

M8 (8mm)

13mm

M10 (10mm)

17mm

M12 (12mm)

19mm

M14 (14mm)

22mm

M16 (16mm)

24mm

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