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IS 14803-2 (2000): Plain Bearings, Part 2: Tolerances on
Form and Position and Surface Roughness for Shafts, Flanges
and Thrust Collars [PGD 13: Bearing]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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IS 14803 (Part 2) : 2000
IS0 12129-2 : 1995
Indian Standard
PLAIN BEARINGS
PART 2 TOLERANCES ON FORM AND POSITION AND SURFACE
-ROUGHNESS FOR SHAFTS, FLANGES AND THRUST COLLARS
ICS 21.100.10
0 BIS 2000
BUREAU OF INDIAN STANDAR~DS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Augusf 2000 Price Group 2
Plain Bearings Sectional Committee, LM 11
NATIONAL FOREWORD
This Indian Standard (Part ~2)w hich is identical with IS0 12129-2 :I 995 ‘Plain bearings - Part 2:
Tolerances on form and position and surface roughness for shafts, flanges and thrust collars’ issued by
the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards
onthe recommendation of the Plain Bearings Sectional Committee and approval of the Light Mechanical
Engineering DivisionCouncil.
This standard is being published in two parts. The other part of the standard is:
IS 14803 (Part 1) : 2000 Plain bearings : Part 1 Fits
The text of IS0 standard has been approved as suitable forpublication as Indian Standard without
deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention
is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should be
read as ‘Indian Standard’.
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice
is to use a point (.) as the decimal marker.
The Technical Committee has reviewed the provisions of the following IS0 Standards for which reference
is made in the text and has decideo’that they are acceptable for use in conjunction with this
standard:
IS0 7902-l Hydrodynamic plain journal bearings under steady-state conditions - Circular
cylindrical bearings - Part 1 : Calculation procedure
IS0 7902-2 ~Hydrodynamic plain journal bearings under steady-state conditions - Circular
cylindrical bearings - Part 2 : Functions used in the calculation procedure
IS0 7902-3 Hydrodynamic plain journal bearings under steady-state conditions - Circular
cylindrical bearings - Part 3 : Permissible operational parameters
IS0 12301 :1992 Plain bearin gs -Quality control techniques and inspection of geometrical and material
quality charac t eristics
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 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 14903 ( Part 2+): 2ooo
IS0 12129-2 : 1995
Indian Standard
~PLAIN BEARINGS
PART 2 TOLERANCES ON FORM AND POSITION AND SURFACE
ROUGHNESS FOR SHAFTS, FLANGES AND THRUST COLLARS
1 Scope IS0 7902-3. .-‘I, Hydrodynamic plain journal bearings
under steady-state conditions - Circular cylindrical
This part of IS0 12129 specifies tolerances on form bearings - Part 3: Permissible operational ,parame-
and position as well as the surface roughness of ters.
shafts, flanges and thrust collars as used in plain
bearing units. It is applicable to journal or thrust plain IS0 12301:1992, Pl@n bearings - Quality control
bearing units or to a combination of both, installed ei- techniques and inspection of geometrical and material
ther horizontally or vertically. quality characteristics.
This part of IS0 i-2129 is not applicable to crankshaft
3 General
bearing units in combustion engines.
Specifications for use in thick-wall plain journal
bearings are based on a minimum wall thickness di-
2 Normative references ameter ratio greater than or equal to 0,ll (reference
value).
The following standaps contain provisions which,
through reference in this text, constitute provisions The.reliability of a plain bearing is not only a function
of’this part of IS0 12129. At the time of publication, of the proper selection of material and fit, but de-
the editions indicated were valid. All standards are pends in particular on the quality of the shafts, flanges
subject to revision, and parties to agreements based and thrust collars used in the plain bearing unit.
on this part of IS0 12129 are encouraged to investi-
The spread of the accuracy grade is based on the
gate the possibility of applying the most recent edi-
minimum lubricant film thickness b,, in micrometers,
tions of the standards indicated below. Members of
calculated for each particular application in accordance
IEC and IS0 maintain registers of currently valid
with parts 1 to 3 of IS0 7902.
International Standards.
IS0 7902-l :-l), Hydrodynamic plain journal bearings
4 Dimensions
under steady-state conditions - Circular cylindrical
bearings - Part 1: Calculation procedure.
See figures 1 to 4 and table-l.
IS0 7902-2. .-‘1, Hydrodynamic plain journal bearings
The illustrations show plain bearings in the horizontal
under steady-state conditions - Circular cylindrioal position.
bearings - Part 2: Functions used in the calculation
procedure.
1) To be published.
1
IS 14W3 (Part 2) : 2000
IS0 12129-2 : 1995
r
Figure 1 - Shaft for journal bearings - A
Figure 3 - Shaft with thrust collar for journal
thrust bearings, capable of carrying load on both
sides - C
Figure 2 - Shaft with two flanges for journal
thrust bearings, capable of carrying load on both
sides - B
Figure 4 - Shaft with flange or thrust collar for
journal thrust bearings, capable of carrying load
on one side - D
IS 14503 ( Part-2) : 2000
IS0 12129-2 : 1995
T_a--b.-le 1
Accuracy grade
Feature/parameter on drawing
5 10 20 30
Lubricating film thickness h,tim 5<hrrc10 10<hrr<20 2o<h,<30 hQ> 30
Roundness tolerance t, mm 0,004 0,006 0.01 0,015
Cylindrical form’) Straightness tolerance 4,mm 0,005 0,Ol 0,015 0,02
Parallelism tolerance gmm 0,015 0,02 0,03 0,04
Runout tolerance t4 mm 0,006 0,008 0,012 0,018
Flatness tolerance*) t5 mm 0,006 0,008 0,012 0,018
Concentricity tolerance r,mm 3) 3) 3) 3)
4 w 0.4 64 0,63 0.8
Surface roughness”)
R, pm 2.5 4 5 63
I
1 1) For reasons of measurement techniques and economic considerations, the cylindrical form has been toleranced for
characteristics of roundness, straightness and parallelism.
2) The restrictive specification “not concave” on figures 2 to 4 shall be observed.
3) The concentricity tolerance is a function of the specific operating conditions and thus is subject to agreement.
4) The specification of the surface roughness shall be based on R, or R,, subject to agreement.
5 Design 6 Testing
For reasons of production engineering, the curved Testing of the quality characteristics shall be carried
transition on the shaft between the radial part and the out in accordance with IS0 12301.
axial part can also be made as an undercut.
7 Designation
Given the great number of possible bea ring seals, no
details can be indicated with regard to the area of the
Designation of the tolerances on form and position as
sealing zone. The geometry and surface finish of the
well as of the surface roughness of a shaft with two
shafts, flanges and thrust collars shall be specified as
flanges at the position of a journal thrust bearing ca-
a function of the bearing seal selected.
pable of carrying load on both sides (B) (see figure 2),
accuracy grade 20:
Plain bearing IS0 12129 - B20
3
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Enquiries relating to copyright be addressed to the Director (Publications), BTS.
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 is reaffiimed when such review indicates
that no changes are needed: i fthe 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 Catalogue’ and ‘Standards: Monthly Additions’.
This Indian Standard has been developed from Dot: No. LM 11 (0425).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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