August 2002
Mercedes-Benz
Screws with external hexalobular driving
feature
with large flange
MBN 10 143
Observe list of approved suppliers
Supersedes
edition: 2001-12Supersedes
DIN 34801
Continued on pages 2 to 4
Issued by:
DaimlerChrysler AG D-70546 Stuttgart
Standards (EP/QIN)
Technical responsibility (Name): D?rfel
Department: EP/QIN Plant:019Telephone: (+49) 711 17- 3 35 21HPC:D652Sequence number 14 071
Confidential! All rights reserved. Distribution or copies without written agreement by DaimlerChrysler AG prohibited.
Contractors may only receive standards through the responsible purchasing department.
Scope
This standard contains specifications for screws with external hexalobular driving feature and large flange with coarse and fine pitch thread and nominal thread diameters from 5 mm to 20 mm, with property classes 8.8 and 10.9 in product grade A and with nominal thread diameter from 4 to 12 mm made of Al9, Al10.
The gauge dimension of the external hexalobular driving feature is specified in MBN 10 144.
Approval of procurement sources
All Torx licensees of the Camcar Division of Textron lnc., USA, shall have unrestricted approval.
Other manufacturers wishing to be granted approval shall ensure that their products comply with the licensee's technical requirements. Product testing is required.
The approval of procurement sources applies to parts manufactured from aluminium alloys.
Page 2
MBN 10 143 : August 2002
l siehe Fu?note Y Aluminium design
d s sieh
e Fu?note 2)
x 1
siehe DIN 76-1
Y Design with thread up to head
For screws made of aluminium :a Alu = 2P + l f max.
Designation of a screw with external hexalobular driving feature with large flange and thread M10, nominal length l = 80 mm, property class/material and surface protection, e.g.:
Hexalobular screw MBN 10 143 - M10 x 80 - 10.9 DBL 9440.40
Hexalobular screw MBN 10 143 - M10 x 80 - Al9
For the designation of types and designs with additional ordering information, refer to DIN 962.
1) Screws with lengths between the stepped lines in Table 1 have threads approximately up to the head.2)
Shank diameter d s ? flank diameter of the thread
From the lower stepped line, shank shoulder 3 1,5 d long wih d s = d are possible. For screws made of aluminium d s = d
X
d a
a
r
d
l see footnote
1)
d s se
e footnote 2)x 1 see DIN 76-1
Page 3
MBN 10143 : August 2002 Table 1
Thread size d M5M6M7M8
(M8x1)
M10
(M10x1)
(M12)
M12x1,5
(M14)
M14x1,5
(M16)
M16x1,5
(M18)
M18x1,5
(M20)
M20x1,5
P Coarse th.0,8111,251,51,75222,52,5
a max.2,4333,754,55,25667,57,5
b Nominal40505565808080808080
min.1,451,752,12,653,604,105,105,506,006,50 c1
max.1,702,002,52,903,904,405,405,806,406,90 d a max.5,706,807,89,2011,2013,7015,7017,7020,2022,40 d c max.11,8014,2015,817,9021,802629,9034,5038,6042,80 d w min.9,8012,2013,8015,8019,6023,8027,6031,9035,9039,90
max.6,507,50810,0012,0014,0016,0019,0021,5024,00 k
min.6,257,257,759,7511,7513,7515,7518,7521,2523,75 k1min.1,802,002,253,103,703,904,506,107,108,70 h max.0,900,900,900,901,301,301,301,301,401,40 l f Alu max.1,41,41,41,92,12,8----
r min.0,200,250,30,400,400,600,600,600,600,80 External hexa-
lobular driving
feature size
E8E10E10E12E14E18E20E24E28E32
Lenght l
10
12
16
20
25
30
35
40Thread approximately up to head 1)
45
50
55
60
65
70
80
90
100
110
120
130
140
150
160
180
200
Page 4
MBN 10 143 : August 2002
Technical delivery conditions
Table 2
Material
Steel
Aluminium alloy
General
requirements International standard DIN ISO 8992
Tolerance
6 g
International standard ISO 261, ISO 965-2
Property class (Material)8.8, 10.9Al9; Al10Standard
DIN EN ISO 898-1
MBN 8839Product grade A
International standard
DIN EN ISO 4759-1
Surface protection in acc. with DBL9440
Bright + coated with sliding compound
Finish
Surface roughness is covered in DIN 267 Part 2
Limits for surface discontinuities are covered in DIN EN 26 157 Part 1 and Part 3
Acceptability
For acceptance procedure, see DIN ISO 3269 and MBN 10 168.
Thread rolling screws (made of steel)
- Case hardened and tempered thread rolling screws
Mechanical and performance requirements in accordance with DIN EN ISO 7085Designation example:
Hexalobular screw MBN 10 143 - M8 GFx 60 DBL 9440.40
- Quenched and tempered thread rolling screws DUOTAPTITE
Mechanical and performance requirements in accordance with MBN 7085-2Designation example:
Hexalobular screw MBN 10 143 - M8 DTx 64 - 10.9 DBL 9440.40
Length grading in accordance with MBN 7085-2 Table 4.
Matrix of characteristics
For hexalobular screws in accordance with this standard, matrix of characteristics MBN 4000-2-1.1 shall apply.For thread rolling screws matrix of characteristics MBN 4000-2-1.11 shall apply.
Changes
-Thread size M7 adopted.
Thread
Limit deviations and geometrical tolerances
Mechanical properties