IS 14824: Aerospace - Self-locking, Fixed, Single-lug Anchor Nuts, Reduced Series, with Counterbore, with MJ Threads, Strength Classification 1 100 MPa/235° C

8 Pages·2000·0.99 MB·English

by  Bureau of Indian Standards

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IS 14824 (2000): Aerospace - Self-locking, Fixed,
Single-lug Anchor Nuts, Reduced Series, with Counterbore,
with MJ Threads, Strength Classification 1 100 MPa/235° C
[TED 14: Aircraft and Space Vehicles]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS 14824:2000
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W?7EFf/235°% —
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—.-
Indian Standard
AEROSPACE — SELF-LOCKING, FIXED, SINGLE-LUG
ANCHOR NUTS, REDUCED SERIES, WITH
COUNTERBORE, WITH MJ THREADS, STRENGTH
CLASSIFICATION 1100 MPa/235° C — SPECIFICATION
ICS 49.030.30

0 BIS 2000
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

September 2000 Price Group 1
Aircraft and Space Vehicles Sectional Committee, TED 14
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Aircraft
and Space Vehicles Sectional Committee had been approved by the Transport Engineering Division Council.
The configuration and dimensions specified in this standard are same as given in 1S0 3191 : 1998
‘Aerospace — Nuts, anchor, self-locking, fixed, single-lug, reduced series, with counterbore, with MJ
threads, classifications : 1100 MPa (at ambient temperature)/315”C, 1100 MPa (at ambient -....-
[cmpcrature)/425°C — Dimensions’. In addition it specifies material composition and surface treatment
rcquired for material of anchor nuts.
For the purpose of deciding whether a particular requirement of this standard is complied with, the final
value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance
with IS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number of singniflcant places
retained in the rounded off value should be the same as that of the specified value in this stan,~ard.
IS 14824:2000
Indian Standard
AEROSPACE — SELF-LOCKING, FIXED, SINGLE-LUG
ANCHOR NUTS, REDUCED SERIES, WITH
COUNTERBORE, WITH MJ THREADS, STRENGTH
CLASSIFICATION 1100 MPa/235°C — SPECIFICATION
1 SCOPE 3 FIELD OF APPLICATION
These nuts are intended for use in airborne vehicle
This standard specifies the dimensions, material and
assemblies, in which the fasteners are mainly
other requirements of self-locking, fixed, single-lug,
subjected to shear loads. The counterbore is deep
anchor nuts, reduced series, with counterbore, with
enough to accommodate a bolt plain shank in excess
MJ threads of classification 1100 MPa/235°C.
of assembly thickness as well as the incomplete
threads.
2 REFERENCES
They are intended to be used with threaded parts of
The following standards contain provisions which 1 100 MPa tensile strength classification which
through reference in this text, constitute provision corresponds to the minimum tensile stress which the
of’ this standard. At the time of publication, the nut is able to withstand at ambient temperature
cdi tions indicated were valid. All standards are without breaking or cracking when tested with a
subject to revision, and parties to agreements based bolt of a higher class.
on this standard are encouraged to investigate the
The cadmium plating restricts the use of these nuts
possi hility of applying the most recent editions of
to a temperature not exceeding 235°C.
Ihc standards indicated below:
4 CONFIGURATION AND DIMENSIONS
1S/1S0 No. Title
4.1 Dimensions and tolerances of anchor nuts are
919 ISO system of limits and fits:
given in Table 1. They apply after any surface
(Part 1): 1993 Part 1 Bases of tolerances
coating(s) but before the application of any
deviations and fits (second
lubricant. Standard tolerance symbols for linear
revision)
dimensions are in conformity with IS 919(Part 1).
1572: 986 Electroplated coatings of
cadmium on iron and steel
4.2 Screw Threads
(second revision)
6603: 972 Stainless steel bars and flats
The profile of threads shall be as per IS 10980
9089: 996 Aircraft — AIuminium and (Part 1). The dimensions of the thread shall be in
wrought aluminium rivets — accordance with IS 10980 (Part 2).
General requirements (@t
revzkiorz)
5 MATERIAL
I0980 Aircraft bolts and nuts (MJ
threads) 5.1 Alloy steel of grade 15Crl 6Ni2 of IS 6603 in
(Part 1): 1984 Basic profile hardened and tempered condition or any other alloy
(Part 2): 1984 Dimensions of bolts and nuts steel meeting the tensile strength requirements may
ISO 5855-2:1988 Aerospace — MJ threads — be used for the manufacture of these nuts.
Part 2 Limit dimensions for
bolts and nuts 5.2 Surface Treatment
ISO 8788:1987 Aerospace — Fasteners —
The nuts shall be cadmium plated to the service
Tolerances of form and position
condition 3 of IS 1572 or as agreed to between the
for nuts
manufacturer and the purchaser.
1
IS 14824:2000
Table 1 Dimensions and Tolerances of Anchor Nuts
(Clause 4.1)
All dimensions in rnillimetm~.
[Ay]”
+y
EMOVE SHARP EDGES 0.1 TO 0.4
0s
‘H
3-+ -. -.
..
H3-
FORM OUT-OF-ROUND IN THIS
= TO ACHIEVE THE SELF- ,,
~~ I I LOCKING TORi2UE-REQUIREMENT”
SECTION YY CONFIGURATION WITli CAP
Diameter Thread 3) c D E F G H J4) J( ~ ~ ~ ~ 5) ~ ~ ~
Code Mux Max Min Min Max Max Mar Max Max J’fux kfUX .
040 MJ4 X0.7-4H6H 6.6 6 4.4 2.2 6.2 8 18.2 5.8 11 13
1.1 2.5

050” MJ5 X 0.8-4H6H 0.4 8.1 7 5.5 5.5 2.4 7.3 9 19.7 6.9 11.4 13.4 2.5
060” MJ6 x 1-4H5H 9.2 8 6.5 2.7 8.7 10 21.7 8.1 1.4 12.7 14.7 3
NOTES
Tolerances of form and position shall conform to those specified in ISO 8788. Details of form not stated are at the manufacturer’s
option.
I)These “alUes, in micrometR~, apply before my surface coating(s), is (are) applied. The vsshresdo not aPPIY to threads Punched
holes or shear edges the surface texture of which will be as achieved by the usual manufacturing methods.
1)Tooling marks permissible in this area.
3)[naccordance with 1S0 5855-2 in the self-locking zone, the tolerances apply before forming out-of-roond.
4)Measured at sharp corners (chamfered) or point of tangency (redi-used)
5)Maximum protrusion of the bolt.
6 DESIGNATION 7 INSPECTION
An anchor nut shall be designated by its name, The inspection is by quality control methods
diameter code and number of this standard: designed to ensure that the manufacturing process
is stable and that the anchor nuts meet the
Exumple: requirement of the specification. For sampling and
inspection plan refer Table 1 of IS 9089.
A SCIf-locking, fixed, single-lug, anchor nuts with
countcrborc having diameter code 050 and 8 PACKING
conforming to this standard shall be designated as:
The packing shall be as pe~ agreement between the
Anchor Nut 050 IS 14824. supplier and the purchaser.

2
—
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote
harmonious development of the activities of stardardization, marking and quality certification of goods and
attending to connected matters in the country.
Copyright
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without the prior permission in writing of BIS. This does not preclude the free use, in the course of
implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.
Enquiries relating to copyright be addressed to the Director (Publication), BIS
Review of Indian Standards —
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodically; a standard along with amendments isreaffirmed when such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue
of’ BIS Handbook’ and’ Standards: Monthly Additions’.
This Indian Standard has been developed from Dot: No. TED 14 (141).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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