ISO 5855-2:1981
(Main)Aerospace construction — MJ threads — Part 2: Dimensions for bolts and nuts
Aerospace construction — MJ threads — Part 2: Dimensions for bolts and nuts
Constructions aérospatiales — Filetage MJ — Partie 2: Dimensions pour vis et écrous
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Standards Content (Sample)
international Standard @ 585512
INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON*MEXIIYHAPOLIHAR OPrAHH3AUHR il0 CTAH~APTH3AUHM.ORGANlSATION INTERNATIONALE DE NORMALISATION
Aerospace construction - MJ threads -
Part 2 : Dimensions for bolts and nuts
Constructions aérospatiales - Filetage MJ - Partie 2 : Dimensions pour vis et écrous
First edition - 1981-12-01
UDC 621 382.082 : 629.7 Ref. No. IS0 58!%/2-1981 (E)
Descriptors : aircraft industry, screw threads, diameters, dimensions, dimensional tolerances, bolts, nuts (fasteners).
Price based on 6 pages
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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national Standards is carried out through IS0 technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
t
and non-governmental, in liaison with EO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 5855/2 was developed by Technical Committee
ISO/TC 20, Aircraft and space vehicles, and was circulated to the member bodies in
July 1980.
It has been approved by the member bodies of the following countries :
Austria France Romania
Belgium Germany, F. R. South Africa, Rep. of
Brazil Ireland Sweden
Canada Italy United Kingdom
Chile Japan USA
China Netherlands
Czechoslovakia Pakistan
The member body of the following country expressed disapproval of the document on
technical grounds :
USSR
O International Organization for Standardization, 1981 O
Printed in Switzerland
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INTERNATIONAL STANDARD IS0 5855/2-1981 (E)
Aerospace construction - MJ threads -
Part 2 : Dimensions for bolts and nuts
1 Scope and field of application
4 Tolerance classes
This part of IS0 5855 specifies dimensions for MJ threads for
See table 2 and IS0 96511.
bolts and nuts of nominal diameter 1,6 to 39 mm for use in
aerospace construction.
Table 2 - Tolerance classes
Requirements for thread dimensions for bolts and nuts of
Bolt threads Nut threads
nominal diameter 1,2 mm or less are given in ISOIR 1501.
6H for nominal diameter < 5 mm
5H for nominal diameter > 6 mm
2 References
IS0 96511, IS0 general purpose metric screw threads -
Tolerances - Principles and basic data.
5 Provisions for coated threads
ISO/R 1501, IS0 miniature screw threads.
Before coating, the dimensions of the threads shall be com-
:
patible with
IS0 58551 1, Aerospace construction - MJ threads - Part I :
Basic profile.
the thickness of the coating selected;
a)
the maximum and minimum dimensions specified in
b)
this International Standard.
3 Nominal diameters and pitches
In order to reduce the number of manufacturing and inspection
See table 1.
tools, it is recommended that, where possible, standardized
tolerance classes for threads (grade and position) be used.
Table 1 - Nominal diameters and pitches
Dimensions in millimetre
6 Maximum and minimum dimensions
Nominal diametei Pitch Nominal diamete
dorD P d or D
6.1 General
0,35 14
1,6
Finished parts (coated or non coated) shall conform to the max-
2 16
0.4
imum and minimum dimensions given in tables 4 to 7. To
0,45 18
23
check these dimensions, limit gauges in accordance with
3 20
0,s
table 3 shall be used.
3.5 0,6 22
4 24
0,7
Table 3 - Thread length of limit gauges
5 27
0,8
Nominal diameter
6 1 30
dorD
Thread length of limit gauges
7 1 33
mm
8 1 36
< 10 Equal to the nominal diameter
39
10 1.25
12 1.25 > 10 I 9P 1
1
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IS0 5855/2-1981 (E)
6.2 Profiles the following limits :
Figures 1 and 2 illustrate the position and form of the actual
- d3 max. and a width of 0,312 5 P (corresponding to the
profiles (maximum, minimum) in relation to the basic profile
point of tangency between diameter dl and the flanks of the
(see IS0 5855/1).
thread). This implies a maximum radius equal to 0,180 42 P;
6.3 Bolt threads -
d3 min. and a minimum radius equal to 0,150 11 P.
See figure 1.
Within these limits, any continuous, non-reversing blended
curve is permitted, provided that it comprises radii not less
The connection between the root diameter d3 and the flanks of
than 0,150 11 P.
the thread is rounded in form. This connection shall lie within
Pitch f A P
1
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SO 5855/2-1981 (E)
Table 4 - Maximum and minimum dimensions for bolts of tolerance class 4h6h
Dimensions in millimetres
Maior diameter Pitch diameter Root diameter
d
d2 d3
Thread designation
'd
max. min. max. min. max. min.
(6h)
1,196
MJ 1.6 x 0,35 - 4h6h 1,600 1,515 0,085 1,373 1,333 0.040 1,135 0,061
MJ 2 X 0.4 - 4h6h 2,000 1,905 1,740 1,698 0,042 1,538 1,472 0,066
0,095
MJ 2,5 x 0.45 - 4h6h 2,500 2,400 0,100 2,208 2,163 1,980 1,908 0,072
0.045
2,423
MJ 3 X 0,5 - 4h6h 3,000 2,894 0,106 2,675 2,627 2,345 0,078
0,048
0,125 3,110 3,057 0,053 2,807 2,718 0,089
MJ 3,5 X 0.6 - 4h6h 3,500 3,375
MJ 4 x 0.7 - 4h6h 4,000 3,860 0,140 3,545 3,489 0,056 3,192 3,094 0,098
MJ 5 X 0.8 - 4h6h 5,000 4,850 O, 150 4,480 4,420 0,060 4,076 0,108
3,968
MJ 6 x 1 - 4h6h 6,000 5,820 0,180 5,350 5,279 0,071 4,845 4,713 0,132
MJ 7 x 1 - 4h6h 7,000 6,820 0,180 6,350 6,279 0,071 5,845 5,713 0,132
6,845 6,713 0,132
MJ 8 x 1 - 4h6h 8,000 7,820 0,180 7,350 7,279
...
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