IS 14798: Aerospace - Self-Locking, Fixed, Single-Lug Anchor Nuts with Counterbore, Classification 1 100 MPa/235°C

8 Pages·2000·1 MB·English

by  Bureau of Indian Standards

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IS 14798 (2000): Aerospace - Self-Locking, Fixed,
Single-Lug Anchor Nuts with Counterbore, Classification 1
100 MPa/235°C [TED 14: Aircraft and Space Vehicles]
“!ान $ एक न’ भारत का +नम-ण”
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IS 14798 : 2000

Indian Standard
AEROSPACE - SELF-LOCKING, FIXED, SINGLE-LUG
ANCHOR NUTS WITH COUNTERBORE,
CLASSIFICATION 1 1~00M Pa/235”C - SPECIFICATION
ICS 49.030.30

0 BIS 2000
BUREAU QF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
August 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 the same as given in IS0 3168: 1998
‘Aerospace -Nuts, anchor, self-locking, fixed, single lug, with counterbore, with MI threads, classifications:
1 100 MPa (at ambient temperature)/235”C and 1 100 MPa (at ambient temperature)/315”C and 1 100 MPa
(at ambient temperature)/425”C - Dimensions’. In addition it specifies material composition and surface
treatment required 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 significant places retained
in the rounded off value should be the same as that of the specified value in this standard.
IS 14798 : 2000
Indian Standard
AEROSPACE-SELF-LOCKING, FIXED, SINGLE-LUG
ANCHOR NUTS WITH COUNTERBORE,
CLASSIFICATION 1 100 IMPa/ 5OC - SPECIFICATION
1 SCOPE Only maximum, envelope dimensions and those
affecting interchangeability are imposed. The
This standard specifies the requirements for
minimum dimensions are limited by the strength
single-lug, counterbore, fixed anchor nuts, with a
requirements. Details of form, not stated, are left to
self-locking feature achieved by forming the upper
the manufacturer’s option.
portion out-of-round.
~2 REFERENCES 4.2 Dimensions
The following standards contain provisions which All linear dimensions are in millimetres; they shall
through reference in this text, constitute provision of conform with the table and apply after cadmium
this standard. At the time of publication, the editions plating, but before dry film lubricant.
indicated were valid. All standards are subject to
revision, and parties to agreements based on this 4.3 Screw Threads
standard are encouraged to investigate the possibility
of applying the most recent editions of the standards The profile of threads shall conform to IS 10980
indicated below: (Part 1). The dimensions of thread shall be in
accordance with IS 10980 (Part 2).
IS No. Title
5 MATERIAL
1572:1986 Electroplated coatings of
cadmium on iron and steel
Alloy steel of grade 15Cr16Ni2 of IS 6603 in
(second revision)
hardened and tempered condition or any other alloy
6603: 1972 Stainless steel bars and flats
steel meeting the tensile strength requirements may
10980 Aircraft bolts and nuts (MJ be used.
threads):
6 SURFACE TREATMENT
(Part 1): 1984 Basic profile

(Part 2): 1984 Dimensions fo r ~bolts and nuts The nuts shall be cadmium plated to the Service
Condition No. 3 -of IS 1572 or as agreed to between
3 FIELD OF APPLICATION
the manufacturer and the purchaser.
3.1 These nuts are intended [or use in airborne vehicle
7 DESIGNATION
assemblies, in which the fasteners are mainly
subjected to shear loads. The counterbore on thread
An anchor nut shall be designated by its name.
size 4 mm and larger is deep enough to accommodate
diameter code and number of this standard:
a bolt plain shank in excess of assembly thickness as
well as the incomplete threads; 3 mm nut does not Example :
have a counterbore.
A self-locking, single lug, anchor nuts with
3.2 They are intended to be used with threaded parts
counterbore having diameter code 050 and
up to l 100 MPa tensile strength classification.
conforming to this standard shall be designated as:
3.3 The cadmium plating restricts the use of these
nuts to a temperature not exceeding 235°C. Anchor Nut 050 IS 14798
4 REQUIRED CHARACTERISTICS 8 PACKING
4.1 Configuration
The packing shall be as per agreement between the
The configuration shall be in accordance with Fig. 1. supplier and the purchaser.

I
IS 14798 : 2000
67 (3)”
F&lWE SHARP EDGES O--lT OO.4
N
t-5 T
I--
A$ERNfM;E,, j;COUNTERSUNK RIVET
IFI 0 Y PURCH-
AS #ibAY BE Di%tEk Of! CUT COU -
NTERSUNK (AT MANUFACTURER* S
OPTION1
FLANGE OR BEADS OPtIONAt
r
GM OUT OF ROUND IN THIS AREA TO
ACHIEVE THE SELF tOCKlNG TORQUE
REQUIREMENT 2)
_ P
9;
Diameter Thread’) C D E F G H J” K L
Code
Max Max Min Mm Max Max Max
-__.

030 MJ3 x O.S-4H6H -- - 6 6 - - 4.6 6 17.7

040 MJ4 x 0.7-4H6H 6.6 8..5 4.4 2.2 6.2 8 23.7
050 MJS X 0.8-4H6H 0.4 8.1 9.5 8 5.5 2.4 7.3 9 25.2
060 MJ6 x 1-4HSH 9.2 6.5 8.7 10 27.7
I1 2.7 ‘-
080 MJ8 x 1-4HSH 12.8 8.5 10.9 13 29.7
0.5 . 8.5
100 MJlO x 1.25-4HSH 15 13 10.5 3 12.9 16.2 34.3
NOTE - Tolerances of form and position shall conform to those ~specified in IS0 8788. Details of form not stated are at the
manufacturer’s option
t) These values, in micrometres, apply before any surface coating(s) (are) applied The values do not apply to threads, punched holes or
shear edges, the surface texture of which will be as achieved by the usual manufacturing methods.
*) Tooling marks permissible in this area.
3, In accordance with IS0 5855.2 in the self-locking zone, the tolerances apply before forming out-of-round.
4, Measured at sharp corners (chamfered) or point of tangency (radiused).
3) Maximum protrusion of the bolt.
FIG. 1 CONFIGURATWIOINTH C AP

2
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This Indian Standard has been developed from Dot : No. TED 14 (140).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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