Din 555=1983

UDC 621.882.31 :621.882.082.1

December 1983

DEUTSCHE NORM

DIN 555

M5 to M100 x 6 hexagon nuts Product grade C Sechskantmuttern; Gewinde M 5 bis M 100 X 6; Produktklasse C

Supersedes December 1972 edition

As it is current practice in standards published by the lnternational Organization far Standardization (ISO}, the comma has been used throughout as a decimal marker.

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The revised property classes in accordance with DIN ISO 898 Part 2 can only be used for hexagon nuts in accordance with this standard within the range up to M 39, with the hitherto applicable proof loads in accordance with DIN 267 Part 4. lt is therefore recommended to use only hexagon nuts in accordance with DIN 972 (modified version of ISO 4034) for new designs in this range, the proof loads of which are laid down in DIN ISO 898 Part 2. In order to make the necéssary distinction between types of nuts, the identification symbol of nuts in accordance with DIN 555 will in future have to display two vertical lines, one on either side of the code number denoting the property class, affixed durably, e. g. 151 (see DIN 267 Part 4 *) ).

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Dimensions in mm

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1 Field of application

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This standard gives specifications for product grade C metric hexagon nuts with metric thread sizes from M 5 to

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M 1O X 6.

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lf, in special cases, specifications other than those listed in the present standard are required, e.g. regarding property classes, they shall be selected from the appropriate standards.

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2 Dimensions

E

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C.-

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Countersink at start of ......_..'..!!-_¡.,,, thread perm itted at either si de

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s

m' =mínimum wrenching height (0,8 m min.)

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August 1983 edition.

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Continued on pages 2 to 4

Beuth Verlag GmbH. Berlin 30, has exclusive sale rights far German Standards (OIN-Normen) 04.84

DIN 555 Engl. Príce group 5 Sales No. 0105

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Page 2 DIN 555 Thread size d

M5

p 1)

M6

0,8

1

dw

min.

6,7

8,7

e

min.

8,63

10,89

m'

1,5

M 12 1,75

M 16

M 20

2

2,5

11,5

15,5

17,2

22

27,7

14,20

18,72

20,88

26,17

32,95

5

6,5

8

10

13

16

max.

4,6

5,6

7,25

8,75

10,75

1 ,9

16,9

min.

3,4

4,4

5,75

7,25

9,25

12,1

15,1

min.

2,7

3,5

4,6

5,8

7,4

9,7

12,1

max. =

8

nominal

10

13

17

19

24

30

12,57

16,57

18,48

23,16

29, 16

s

dimension

s

1,25

M 10

4

Nominal dimension

m

M8

mín.

Thread size d

p 1)

7,64

9,64

(M 22)

M 24

2,5

3

(M 27)

M 30

(M 33)

M36

3

3,5

3,5

4

(M39)

M42

(M 45)

4

4,5

4,5

dw

min.

29,5

33,2

38

42,7

46,5

51,1

55,9

59,9

64,7

e

min.

35,03

39,55

45,2

50,85

55,37

60,79

66,44

71,3

76,95

Nominal dimension

18

19

22

24

26

29

31

34

36

max.

18,9

20,05

23,05

25,05

27,05

30,05

32,25

35,25

37,25

min.

17,1

17,95

20,95

22,95

24,95

27,95

29,75

32,75

34,75

13,7

14,4

16,8

18,4

20

22,4

23,8

26,2

27,8

nominal dlmension

32

36

41

46

50

55

60

65

70

-

31

35

40

45

49

53,8

58,8

63,1

68,1

(M52l

M 56

(M60)

m

m'

min.

max. =

s

s

Thread size d

min.

M 48

p 1)

5

dw

m'

6

6

6

88,2

97,7

107,2

121,1

135,4

144,08

161,02

82,60

88,25

99,23

38

42

45

48

51

58

64

72

80

max.

39,25

43,25

46,25

49,25

52,5

59,5

65,5

73,5

81,5

min.

36,75

40,75

43,75

46,75

49,5

56,5

62,5

70,5

78,5

29,4

32,6

35

37,4

39,6

45,2

50

56,4

62,8

75

80

85

90

95

105

115

130

145

73, 1

78, 1

82,8

87,8

92,8

102,8

112,8

127,5

142,5

min. nominal dimension s

min.

69,4

Sizes in brackets should be avoided as far as possible. 1) P = pitch of thread.

6

93,56

max. =

s

6

78,7

l dimension

m

6

M100X6

74,2

mín.

Nomina

5,5

M90X6

83,4

min.

e

5

M 64 M72X6 M80X6

104,86 116,16 127,46

•'

DIN 555 Page 3

3 Technical delivery conditions Steel

Material

In accordance with DIN 267 Part 1.

General requirements Tolerance Thread Standard Mechanical properties Permissible dimensional deviation and deviation of form

Property class (material)

7H D 1 N 13 Part 12 and Part 15 $

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M 39: 5; > M 16 $ M 39: 4; M 39: subject to agreement. DIN 267 Part 4

Standard

e

Product grade

DIN ISO 4759 Part 11

Standard

Surface finish

As processed. DIN 267 Part 2 (at present at the stage of draft) shall apply with regard to surface roughness. DIN 267 Part 21 shall apply with regard to the widening test. DIN 267 Part 9 shall apply with regard to electroplating. DIN 267 Part 10 shall apply with regard to hot-dip galvanizing.

Acceptance testing

DIN 267 Part 5 shall apply with regard to acceptance testing.

4 Designation Designation of a hexagon nut with M 12 thread, assigned to property class 5:

Hexagon nut DIN 555 - M 12 - 5 The DIN 4000 - 2 - 7 tabular layout of article characteristics shall apply to nuts conforming to this standard.

5 Marking D 1 N 267 Part 4 shall apply with regard to the mark ing of nuts.

6 Masses The values of mass listed in the table below are intended for guidance only. M5 M6 M8 M10 M 12 M 16 M20 M 22 M 24

Thread size d

M27

M 30 1

l

Mass (7 ,85 kg/dm3) kg per 1000 units

1'11 2,32 4,62 10,9 15,9 30,8 60,3 80,2 103

Thread size d 6 Mass (7,85 kg/dm3)

M 36 M 39 M42 M 45 M 48 M52 M56 M60 M64 M72X6 M 80 X s

154

216

1

M 33 271

1

I M 90 X s ]M 100 X

1

1 1

369 472 610 750 924 1130 1350 1600 1880

kg per 1000 units

2520

3260

4680

6340

1

Standards referred to DIN

13 Part 12

DIN 13 Part 15 DIN 267 Part 1 DIN 267 Part 2 DIN DIN DIN DIN DIN DIN DIN

267 Part 4 267 Part 5 267 Part 9 267 Part 10 267 Part 21 4000 Part 2 ISO 4759 Part 1

ISO metric screw threads; coarse and fine threads from 1 to 300 mm diameter; selection of diameters and pitches ISO metric screw threads;fundamental deviations and tolerances for threads from 1 mm día meter Fasteners; technical delivery conditions, general requirements (at present at the stage of draft) Fasteners; technical delivery conditions, types of finish and dimensional accuracy Fasteners; technical delivery conditions, property classes for nuts ( previously u sed classes) Fasteners; technical delivery conditions, acceptance testing Fasteners; technical conditions of delivery, components with electroplated coatings Fasteners; technical conditions of delivery, hot-dip galvanized parts Fasteners; technical delivery conditions, widening test far nuts Tabular layouts of article characteristics far bolts, screws and nuts Tolerances far fasteners; bolts, screws and nuts with thread diameters 1,6 < 150 mm and product grades A, B and C.

page 4 DIN 555

Previous editions I

DIN 428: 02.23, 07.25; DIN 555: 04.25, 04.34, 04.68, 12.72; DIN 555 Part 1: 01.41, 01.51x, 03.63

Amendments The following amendments have been made in comparison with the December 1972 edition: a) The standard is now no longer applicable for new designs. The use of DIN 972 (ISO nuts) has been recommended for , this purpose. b) The editorial presentation of the standard has been harmonized with the other standards dealing with hexagon nuts. c) In supplement to the nominal dimensions or in lieu of the nominal dimensions, the limits of size calculated in accord ance with DIN ISO 4759 Part 1 have been adopted in the standard. d) The bearing tace of the nuts has been defined more precisely and has been harmonized with the other hexagon nuts and with DIN ISO 4759 Part 1. e) The former design g has been replaced by product grade C in accordance with DIN ISO 4759 Part 1. t) The dimension m' has been adopted in addition to the nut height m. lt gives an indication of the mínimum height required for the wrench to engage properly. This means that the corners of the hexagon are to be fully shaped up to this height, i. e. the height shall never be less than the dimension emin· g) With due consideration of the international property classes of nuts in accordance with DIN ISO 898 Part 2, the code number for property class 5 has been completed by two vertical lines (one on either side), in conformity with the new edition of DIN 267 Part 4. The purpose of these vertical fines is to draw attention to the lower proof load values of the nuts (stripping strengths) in comparison with the proof loads of nuts in accordance with DIN 972 (ISO nuts) (see Explanatory notes in this connection). h) The technical delivery conditions have been grouped together in tabular form with the relevant references to the appropriate DIN Standards.

Explanatory notes In the last few years extensive investigations and trials have been carried out by Technical Committee TC 2 of the lnter national Organization for Standardization (ISO), during which it was established that the property classes for nuts hitherto employed (DIN 267 Part 4) and the nut heights of 0,8 d formerly considered as standard did not provide the necessary safeguard against thread stripping for the bolted connections. This is particularly true in the case of mechanical bolt and nut tightening methods, in respect of which the bolted connection is tightened right up to the yield point or even beyond, into the zone of plastic deformation. The necessary conclusions have now been drawn from these findings, and the proof loads for the individual property classes and the nut heights have been revised accordingly. Standard DIN ISO 898 Part 2 has adopted the revised property classes and is intended to supersede DIN 267 Part 4 after an appropriate transition period. With due considera,tion given to existing drawings and documents, and to the need for interchangeability, DIN 555 has not been converted to the ISO specifications, but instead its use has been blocked in respect of new designs, with the recommendation that the new Standard DIN 972 (on ISO nuts) should be used in these cases. The old and new nut heights are tabulated below for comparison and information purposes. Thread size DIN 555 Nut height DIN 972 (ISO 4034) max. Thread size

M5

M6

4,6

5,6

¡

Tuercas 6,1 5,6 ex gona1es

M8

M 10

M 12

M 16

M20

7,25

8,75

10,75

13,9

16,9

7,9

9,5

12,2 '

M30

M33

25

27

26,4

29,2

Rosca métrico

M 22

Eiecudón gM 27 M24

555Gewinde. 18,9Ausfünrung 20 g Ch$i:;antmuttem. DIN Metrísches Nut height He:.:ag<:>n !'HJU; metric thread; flnish g DIN 972 (ISO 4034) 19,6 22,3 max.

23 24,3

Las m«!idu de ias tuercas exagonales según esu norma corresponden

. DIN 15,9 r ,·............ . M36 M 39

/ 30Í

31,5

1sd IR 272-1%8· · ------- \

Qmendadón.

18,7

32,25 32,9

lntemationai Organíution for Standardintion (ISO).(in ;< ·· .,· given The revisedpu.bliada propertyporclasses to which higher proof loads are assigned comparison with the former specifications) \, which cannot be '<\. in D 1 N ISO 898 Part 2 made it necessary to specify new symbols for those' nuts con verted to / DIN ISO 898 Medidas en mm with DIN 267 Part 4 (to .which '-..., ···---Part 2, but in respect of which the previous property classes in accordance lower proof loads are assigned) still remain val id (new symbol 151 instead of 5). There are of course certain risks of mix-ups in the case of existing designs and existing stocks, but these risks can be reduced to a minimum if the old DIN nuts (DIN 555) are stored separately from the new ISO nuts (DIN 972), and if they are referred to separately in the documents by giving their DIN numbers. In DIN 972, the widths across flats of 16, 18 and 34 mm have been specified for sizes M 10, M 12 and M 22 in conformity {" have not been adopted in DIN 555. The previously used with DIN ISO 272 and with ISO 4034. These widths across! flats 'O- 1 \ widths across flats of 17, 19 and 32 mm have been retained,! \ because it is intended that DIN 555 will be superseded in its \ 'O"'' \ entirety by DIN 972 after an appropriate transition period.

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lntemational Patent Classification F 16 B 37/00

12.n

1

M 10

!¡.·

M 16

!

MU: j

15,3

17,l

21,6

13

min.

(M39' M42 [M45)

1 1

M 20

!

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l "1J

i

! 32,.'5

M4i [M52; MS6 \ 16

M 24\'i, 19\J

4Í)4

M 30 [M 33j

1

M 36

' 18,5

Í

!

'. :u

4.5 \ 55,,Ji'"f..

i"40.J""

29

:.n

n;n.

36

7i 76

81

83,39 ' 38

89,1)4

!

i

l

90

1

'100

SO

216 211

55

369

--;

MIC!x6 M90x6 1 Ml x6

no

¡

4.2

94,-0: 45

85 ¡10C.J2

.i1 Í 28,! i l5,.il3 lU i 39,55

· [M Tr. ,-'-,-i, - 9-¡- -, . , -22 r- -11 -i5'

!

66,44

72J:R 34

105,Tl 117,!l7

48

51

5S

i2S,.37 ' 64 12.S 'i ¡ 140 ¡¡ ¡

n so

1

' 260