Cross Recessed Cheese Head Screws: Udc 621 882 215.3.091 2 July 1986

UDC 621 882 215.3.091 2

July 1986

DIN 7985

Cross recessed raised cheese head screws Unsenschrauben mit Kreulschlitl

Supersedes December 1984 edition.

In keeping with current practice in standards pvblished by the lntem<JtionBI Organizqaon for Strmderdiz11tion (ISOli

a comma has been used throvghour as the declmal marker.

See Explanatory notes for connection wi th the International standards published by the International Organization for Standardization (I SO).

Dimen sions in mm

1

Dimensions

Raised chees-o h~:tad screw,

Raised chee$e head screw, with

threaded up to the haad

unthreaded portion of shank 1)

(above the stepped line in the table)

(below the stepped line in the table}

" r,

-

~"'?'*" -- · ­

I?

As·rolled end (see DIN 78)

v a

_f._LI-- -

_I -

- •

Other dimensions and details as in left-hand illustration.

The shank diameter may be equal to the thread d iameter (major d iameter} (normal the pitch diameter (reduced shank), at the manufacturer's discnnion.

shank~

or approximately equal to

Cross recess type H

Cross recess type Z

1)

If raised cheese head screws are to be suppl ied with lengths as given below the stepped line and threaded up to the

head, i. e. deviating from the standard design, then symbol A is to be incorporated in the designation in accordance with OlN 962. or the deviating thread length is to be included in the designation, again in accordance with OIN962

(the tolerance on the thread length being normally • ~ P}.

Continued on pages 2 tO 5

370

Page 2

DIN 7985 Thread sized

M 1,6

M2

P '> 0.35 1-- - - - - ---, ----~ a ~ ,:.;;:. ' ,.-l-..:0! _

0,4

!-o.:.:•...;5+_o:.:·:. 5 -J-....:.0·:: 6-lf--o:::. .7

0~

!--0,9

~..:b_ _ __ _ _•.!&:.:P-4-'~5

M 2,5

16

M3

(M 3,5)

1

M4

1.2

1.•

M 5

3.2

-

·

v

40

10

12

16

20

11.57

15.57

19,48

4,75

6, 15

7,68

4

5

6

7

8

~5-.7- l-.~6.8:--~:.:9~.2~_~~~~11_2_-~ 3-:.e:-:-~- ~;.;6=+--=7:.,.5-=-t

1.88 _2.~2-~~-: 2.'= 9_ 5 -..,s,..&<>:-----::~-:: .< 5 • ...;5...;.8.:. 5+_7..:.3 , 2_'-

7 o.< 0,4 o. 1 o.1 0.2 0.2 0.2 o.2s ·- . -7c:..:_-::--+-~-l 7 8 lO 12 16 20 ._ 4_ __;,5 ___ 6:~-·c-----:--_...;: ..,. -...:.:..-~,.......-=-.,...-~

-3

_o:.:·:::. 8 _ _1:..1

= -~-

- '"'='-+..:0:.:.9:___...1_

X

0

No.

1.6 1.9 --- L3 l.l___ l,2~ -·~ -·

Cross rec.ess

type H ----+...;.:. _ _ _ _depth __ _ _ m...; • ' - + 1.02- ' - 1.4

-

_ __

.:..2

3.7

4.8

3.6

.!

-5

5.3

.;.s

g

10.2

7-,-- 2 c.:·---:-2.-:-,:-,--:s.:Co:-:3:--- . -.ui 5.38 •=-"·'---7=---7:,:,---'-:7----7~ 2,24- -2.'~ 3,27 3.53 4.88 5.88

2.6:.,.,.~3:..,.:-f.-'~,.+-4::,3:_~'_::5~-j.l_:6::.7~t-.:8:::,8:_.-.:.9.:: .9:.....j

T

1,27

1,68

1,65

1,17 J-':.~ 05~1_1:93_ -~

m..

___depth

3

-~~s__ 2 ____2._5____ ~_2

- -,-.

-2

1,6

m ~ 1,8 1 2.4 ponou.,ion ~ __!!!_2 1.1

IYP• Z

z.s

2

- -~--- -~~---------

I

----3. ~ 1.i . - - i-.-,- - -

1.8 2.5 2.i -••-.-,-,,.- ,-io-.-m -,--1·-o. 72 , ,-. 1- m

1.5 3

34

1. 18 1.<18 _ ..;o.:. . 1_ _o_.1_

Yf ~---~--------

1,25 2.5

28

6,64 7.64 9.&: 1-2. 7o-:-t--:3_.1_ _ _ .., m•='~+_:1,4~ ~ 2; 1_2_ _2.52 2.82 3,25 3.95 min.

M 10

18 -J....:'::. 9 _ J-=.20 :_-J-.:. 22:_ 25 ____

------+--- r------1___ _ _....,.==m,-;_._+_2;;..9;_1-·3._7~-··' 5.7 ~! ::,:,.~.., , ::'02,~"~""--ll ...' .3 _ 1._6 _....:.2 - I 2.4 r

M8

1 -' --o.8 - ~. 1.6 2

_d~,~------~-·-~2·~~ 2~.6--i!-_3...;.1_ ~~3...;,6~_·.. ;1·~1-·~·7

;.: :sin;ninet

M6

1.9

2.64

3.02

~.0-"6+-'5:..:.2C.3-j

2.36

3.1

3,48

4.~:. 2..J.._5:::·:694 .

I

Nominal ~· .

d imension -~- 2

~

3

1.8-

!

----.-·- ! ~~-5-

--6

3,2

-6~25 -·

16

i

I

't

1s.ss

40 :·-.;5· so

~~

0.11

·-

28.4

_ _

30,4 35.5 40.5

~

39.5

I 49.5 ---- :~ --- f- : ---

I

45.5 so.5

-:~---~- -

0,99

1,4

1.os

1.48

2.66

0:• 9_ ~8 1. '!._"' 1.63 2.91 _ 0.55 0.68 • 1.29 1.79 - ~ 0.61 0.95 1,42 ~,94 3,4 1

--+---1

~ 6,14 5.49

10,9 11,5

21,2

1.54 ~· '.. 1.67 2.25

3,66 3.91

5.84 6.29

12.2 12.8

22,2 23.2

1,92 2.56 2.05 - -2.72

4,4 1

7 7.35

14.2 14.8

24.2 25,2 26.2 -

7.87 8.4

15,8 1s.8

27.7 29.2

8,75

32.1

10,5

11.5 19.1 20.7

8 111.4 8.7 12.3

22,3 23.9

37.7 41,2

0.7!.'::-_~~~~:s --~4$4,16 s.s: _ 13.5

--~·

0.85 0.9 1

t'= -

- -

t

-

!---- -f-. .

_ _ i'_0.67_ ~03 i o.73 1.11 · _

• - 25,4

L

_21.a

44,5

!--_[:o.•3 ..

16.35

21~ . --~ --22:4 ~

Jo ! 29.6 ~ --35_____ it_~.;;·

O.S2 0,67

··1----

~ .T1.~ .s 1s.3s~ 1 9~ . j __ 2?··

!.

- 0.37 0.4

--1-

12,3~ -

1

:s. -- _ 24.6

. ~ .. <2e1 .

1~3 ...

···~--1 3.6~1_1_~~_5-i-

_ :· <1;,·-.. 20 1

'(2~2)'

_8.3 ...:::: "'

l

~· ~~----+- ~ 1 1.65 .. .! 14)

· -

·--'!---

- - !-

0.34

5,25

5.75 ..

·l ---~7

•

---.:25

3.75

_-~-~ - -r-=- ':7__~ .L . _1?_

- -J.----1

2.2 - -

i:a-

1- 4:'75 '

j

Mass (7,95 kg/dm3), in kg per 1000 units, approximately

•1axo'mum '"

tnlmu.m

1,27 1,35

1 ] ___ _ 1.09 t

1,1 8

1.11 -

2.63 3.4

~

j 3~~ 3.4•

4,44

-

i--

~

4 .66

1,47 2.25 2.94 1.59 L 2.so __3.2•

t~

-~-

5.03

s.• 5.7 6.5 7.3

9.6

30.2 35,7

~--- "~~A'r-:::~ -

The screws are. as a general rule, manufactured in the sizes for which the mass has been given {for guidance only). Bracketed sizes should be avoided as f;u as pos5ible. lengths exceeding 60 mm shall be graded in $teps of 10mm.

' )P o pitch ol1hread.

371

DIN 7985

2

Page 3

Technical delivery conditions Material

General requirements

.

-

in standard

--· i'l!!!~dard Product grade

1--- -

Permi$$iblt dimsn· 5ional deviations and deviations of form

- - - --

As specifiCd -

II

4.8 2). 5.8 2). 8.8

(material) ·As specified

}

DIN 13 Part 15.

- .

Property claS$

properties4

Non·ferrous metal

-------6g ')

-

~As speCified~ -

Mechanical

Stainless steel

In accordance with DIN 267 Part 1.

- - class -- -Tolerance

Screw thread

I

Steel

---~---ISO 898 Part 1: _DIN- 267 Par~~-

--

-

-~-~-gan~rd

-----1

As proce,.ed. F« p.roperty ¢ttm 8.8

CuZn • Copper·zinc

A2·70. A4·70

alloy3}

--DIN 267 Part 18. --

A (previously design m}.

- --

--

ISO 4759 Part 1.

---

8right.T

Bright.

s.crews: bttck oxide

(chtmk:IUy ot 'hermally aopliedl

Surface finish

DIN 267 Part 2 shall apply with regard to surface roughness. D IN 267 Part 19 shall apply wi th regard to permissible surface discontinuities.

DIN 267 Part 9 shall apply with regard to electroplating.

Cross recesses

-

--

Acceptance iMpection

Other k inds of surfac.e protection are subjec t to ln·~ccordance

agreement.

with DIN 7962.

- DIN---267 Part 5 shall apply for acceptance inspection.

1} Applies only for screws without surface protection. Tolerance class 6g permits the application of normal coating thicknesses in accordance with DIN 267 Part 9. provided that the zero line is not exceeded. Depending on the coating thick ness required, a greater fundamental deviatio n than that for the g posit ion will have to be selected. A greater fundamental deviation may adversely affect the resis-tance of the bolt/nut assembly to stripping. 2) Permissible hardness:

255 HV m-aximum.

>}Preferably CU2 or CU3 (in accordance with DIN 267 Part 18}. at the manufacturer's discretion. 4 ) Different property classes or d ifferent materials, or a particular grade of material are svbjeet to agreement.

3

Designation

Designation of an M6 raiS4!:d cheese head serew. with length I {nominal dimension) = 20 mm. with type H cross recess2) and a$$igned to property class 4.8:

Raised cheese head screw DIN 7985 - M6 X 20- 4.8 - H OIN 962 shall apply for the designation of types and designs including additonal ordering details.

OIN 7500 shall apply fo r desig.ns with thread roll ing properties. Tabular layout of article characteristics OlN 4000 - 2 - 1 shall apply for bolts and screws in accordance with this standard.

Standards referred to DIN

13 Part 15

DIN

78

DIN 267 Part 1 DIN 267 Part 2 DIN 267 Part 5 DIN 267 Part 9 DIN 267 Part 1 I

ISO metric screw threads; fundamental deviations and tolerances for screw threads from 1 mm diameter upwards Thread ends a nd lengths of projection of bolt ends for ISO metric screw threads In accordance with DIN 13 Fasteners; technical delivery conditions; general requirements Fasteners; technical delivery conditions; finish and dimensional accuracy Fasteners; technical delivery conditions; acceptance inspection Fasteners; technical delivery conditions; electroplated components Fasteners; technical delivery conditions with additions to ISO 3506; components made from stainless and acidproof steels

2) Should symbol H or Z for the cross recess be absent in the designation, e .g. on existing documents based on previous

editions of this standard. then cross recess typo H shall be applicable. In future, the symbol identifying the cross recess type shall always be specified for new designs and in pu(chase order documents.

372

Page 4

Dl N 7985

OIN 267 Part 18 DIN 267 Part 19 DIN 962

Fasteners; techni-cal delivery conditions; compOnents made of nonferrous metals Fasteners; technical delivery conditions; surface d iscontinuities on bolts and screws Bolts, screws, studs and nuts; designations, types and finishes Tabular layouts of article characteristics applying to bolts and nuts Thread rolling screws for ISO metric screw thread

Dl N 4000 Part 2 7500 7962

DIN DIN ISO ISO

Cro5S recesses for scre\N'S; modified version of ISO 4757

Mechanical properties of fasteners ; bolts, screws and studs Fasteners; tolerances for bolts.. screws and nuts with thtead diameters from 1,6 to 150mm and product grades A.. B and C

898 Part 1 4 759 Part 1

Previous editions DIN 7985: 07.53, 08.59, 02.72, 12.84.

Amendments The following amendments have been made in comparison with the f ebruary 1972 edition: a) Cross recess type Z has been adop~ed for the firn tim~ . b) The designation has been amended. c) The content of the standard has bf!en editorially rsv:~o. In comparison wit h the December' 1984 edition. the ·faluei of rare now given as mini mum values (instead of maximum values).

Explanatory notes For some years. screws witfl the so·called Pozidriv C:'O$'S r~essed head have been manufactured and used in ever incte
Maximum d iameter of head

M 1,6 :

Maximum height of head

M 2,5

DIN 7985

3.2

I4

ISO 7045

3,2

4

DIN 965

3

3.8

ISO 7046

3

3,8

j

3

3,8

I 4,7

ISO 7047

3

3,8

4,7

DIN 7985

1,42

1,72

2.1 2

DIN 966

-

M2

-

'I

M3

(M 3,5)

M4

I

M5

M6

MS

M 10

10

12

16

20

5

6

7

8

5

5.6

7

8

9,5

12

16

20

4.7

5.6

6,5

7,5

9,2

11

14,5

18

4.7

5.5

7.3

..

8,4

9,3

11,3

15,8

18,3

5.6

6.5

I 7,5

9.2

11

14,5

18

5,5

7.3

I 8.4

9.3

11.3

15,8

18.3

2.52

2.82

i I

-

'

ISO 7045

1.3

1.6

2.1

2.4

DIN 965

0.96

1.2

1,5

1.65

I

2.6 1.93

I

-

3.25

3,95

4,75

6,15

7.68

3,1

3,7

4,6

6

7,5

2.2

2.5

3

4

5

'

ISO 7046 "

DIN 968 ISO 7047

1 f-- - · 0.96 1

1.2

1.5

1.65

2.35

2,7

2,7

3,3

4,65

5

1,2

1,5

1.65

1.93

2.2

2.5

3

4

5

1.2

1,5

1,65

2,35

2,7

2.7

3.3

4,65

5

The table shows that, in the cas.e of the pan head screws in accordance with DIN 7985, there are hardly any d imensional interchangeability problems with ISO 7045 - 1983. The problem is rather the shape of the head. In ISO 7045. a head with a fla t round shape (mushroorr• head) is specified. which corresponds approximately to the shape of hea d specified in DIN 7986, since withdrawn, a greater ease of manufacture being given a.s the reason for this shape. The head does not have to be guided laterally during the pressing operation. in contrast to the DIN 7985 head, but the resulting optical

373

DIN 7985

Page 5

aspect is somewhat inferior. The head is not truly circular in shape in most cases, because the material is squeezed out·

wards to a certain extent in the area of the cross reoess wings. lnterch.angubility i1 however a critical fKtor in the case of countersunk screW$. There are considerable discrepancies in the ease of sizes M3,5, M4 and MS. and smaller differences with regard to the other sizes. The d ilferencts between the previous countersunk heads as specified in DIN 965 and DIN 966 (and also in DIN 963 and DIN 964) and the new countersunk heads as specified in ISO 7046- 1983 and ISO 7047- 1983 (ond also in ISO 2009 - 1983 and ISO 2010 - 1983) can be uaced back to the fact that a so·called "common head style" has been specified internationally for countersunk screws, applicabla both to screws with a metric screw thread and to screws with a tapping screw thread. Because it will not be possible to withdraw DIN 7985, DIN 9G5 and DIN 966 for some considerable time yet. due to the presence of existing documents and the need for spare parts. the above standards have not been adapted to the new ISO speeificatiom. but only revised to the extent neceuary to meet the requirements of the national situation as it exists today. without the former dimensions being altered. This aPS)Iit:s: in particular 10 the adop1ion of a second cross recess type, which is being used in increasing numbers. ~tong with the l)f'evious CI'OS$o recess. the intention being 10 meet the demands of the matket. The foltow,ng standards are affec-ttd by th.se changes: Ot N 7962 as the basic standard w'th regard to cross rectsses; DIN 965, DIN 966 and DIN 7985 as the product standards relating to cross recessed head screws with metric screw thread; Dl N 7981. DIN 7982 and Dl N 7983 as the product stondards relating to cross recessed head tapping screws; DIN 7995. DIN 7996 and DIN 7997 as the product s tandards relating to cross recessed head wood screws. The above standards either have been or will be complemented accordingly. The two types of cross recess will necessitate a corresponding complement to the designations, but it will not however require any amendments to existing documents. If no symbol for the cros:s receS$ type appears in the dt:Signation. it shall be assumed that the previous ctou ftctss in accordance with DIN 7962 Part 1, August 1959 edition. is intended (now known as type H). Concerning the adoption of the new ISO Standards as national standards. it remains to be decided in what form this can best be done. A partieular problom arises in rMpect of countersunk head tapping screws. becauu tht adoption of the "common head style.. means in this case that the 80° countersink angle will have to be replaced by a 90° angle. This will probably mean that the old national standards will be retained along with the new international standards, for a given transition period.

International Patent Classification F 16 8 35.00

374