इंटरनेट मानक

Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.

“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न' 5 तरफ”

Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”

IS 1131 (2006): Bicycle Bottom Bracket Axle (Amalgamating

IS 11685) [TED 16: Bicycles]

“!ान $ एक न' भारत का +नम-ण”

Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”

है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
 —.—_

IS 1131:2006
(Amalgamating IS 11665: 1966)

n
—
Ilw
( #i?7?7
p%w )

Indian Standard
BICYCLE BOTTOM BRACKET AXLE —
SPECIFICATION
(Third Revision)

ICS 43.150

0 BIS 2006

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

January 2006 Price Group 4

Bicycles Sectional Committee, TED 16

FOREWORD
This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, afier the drafi finalized
by the Bicycles Sectional Committee had been approved by the Transport Engineering Division Council.
This standard was first published in 1958 and subsequently revised in 1968 and then in 1985. In this revision:
a) IS 11685: 1986 ‘Specification for bicycle bottom bracket axle, R type’ has been amalgamated; .
b) Types of bottom bracket axles like tottered type and cotterless type have been added; and
c) Dimensions as per latest trade/manufacturing practices have been included. Length of axle has been
increased as per the latest practice being used in the industry. .

The composition of the Committee responsible for the formulation of this standard is given in -Annex A.
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 1131:2006

Indian Standard
BICYCLE BOTTOM BRACKET AXLE —
SPECIFICATION
(Third Revision)
1 SCOPE designation 11C41O‘S 25 of IS 1570 (Part 3) or from
steel having following chemical composition:
This standard covers the dimensional and other
requirements for bicycle bottom bracket axles of Constituent Percent
tottered type and cotterless type.
Carbon 0.07-0.15
2 “REFERENCES Manganese 0,80-1.20
The following standards contain provisions, which Silicon 0.10, Max
through reference in this text, constitute provisions of Sulphur 0.20-0.30
this standard. At the time of publication, the editions
indicated were valid. All standards are subject to Phosphorus 0.07, Mm
revision and parties to agreements based on this 3.2 Alternatively any case hardening steel may be used.
standard are encouraged to investigate the possibility Such steels shall have a tensile strength of not less
of applying the most recent editions of the standards than 500 MPa m the core after case hardening.
indicated below:
NOTE — 1 Mpri= 0.1 kgflmmz.
M No. Title
3.3 Steels suitable for cold forging be used for
1068:1993 Electroplated coatings of nickel bottom bracket axles manufactured by cold forging
plus chromium and copper plus process.
nickel plus chromium —
Specification (third revision) 3.4 Crank retaining bolthut for cotterless axles .to
1367 (Part 3): 2002/ Technical supply conditions for -conform to property Class 8.8 of IS 1367 (Part 3).
1S0 898-1:1999 threaded steel fasteners: Part 3 3.5 Steel washer for bolt type cotterless axles to
Mechanical properties of conform to IS 2016.
fasteners made of carbon steel
and alloy steel — Bolts, screws 4 SHAPE AND DIMENSIONS
and studs ~ourth revision)
4.1 Cottered Bottom Bracket Axle
1501:2002 Method for Vickers hardness test
for metallic materials (third The tottered bottom bracket axle shall conform to
revision) the shape and dimensions given in Fig. 1 and
corresponding Table 1.
1570 (Part 3): 1979 Schedule for wrought steels:
Part 3 Carbon and carbon- 4.1.1 Alternate for the shape of the end of tottered
manganese free cutting steels bottom bracket axle shall be as per Fig. 2.
@st revision)
4.2 Cotterless Bottom Bracket Axle
1573:1986 Specification for electroplated
coatings of zinc cmiron and steel 4.2.1 Cotterless Bottom Bracket Axle — Bolt Type
(second revision)
The cotterless bottom bracket axle—bolt type shaIl
2016:1967 Specification for plain washers
conform to the shape and dimensions given in Fig. 3
(first revision)
and corresponding Table 2 and the associated crank
2500(Part 1) :2000/ Sampling procedures for retaining bolt and washer shall be as per Fig. 4.
1S02859-1 :1999 inspection by attributes : Part 1
Sampling schemes indexed by 4.2.2 Cotterless Bottom Bracket Axle — Nut Type
acceptable quality limit (AQL)
The cotterless bottom bracket axle—nut type shall
for lot-by-lot inspection (third
conform to the shape and dimensions given in Fig. 5
revision)
and corresponding Table 2 and the associated crank
3 MATERIAL retaining nut shall be as per Fig. 6.

3.1 The axle shall be manufactured from steel of grade 4.2.3 If radius ‘R’ is chosen as less than 4.5 mm in

1
IS 1131:2006

Fig. 1, Fig. 3 and Fig. 5; the shape of ball track for the the axial run-out measured at 25 mm radius on its
bottom braGket axle tottered/cotterle.wtype shall plane, as shown in Fig. 10, shall not exceed 0.3 mm,
conform to Fig. 7. respectively.

4.3 Theaxle shall betleefiom anymanufacturingor 8.3 The angular deviation between the right and lefl
machinifig defects. .The ball track/bearing portion cotter pin abutting fiats of the tottered bottom bracket
shall be finished smooth, for hot forged bottom axle and the phase difference between the right and
bracket axles. For cold forged bottom bracket axles, the left square tapered faces of the cotterless bottom
precision of the cold forging die must be periodically axle shall not exceed 2°, respectively.
checked and maintained so as to achieve desired
9 MARKING
smoothness of ball tracks of the bottom bracket axles.
9.1 The axle shall be clearly and legibly marked with
5 HARDNESS
the following:
5.1 The axle shall be suitably case-~ardened to a a) Manufacturer’s name or trade-mark,
minimum depth of 0.6 mm so as to attain a hardness
b) Batch numbeu and
of 600-800 lW (see IS 150 1) or its equivalent on other
scales. c) Country of manufacture.

5.2 For the determination of hardness, any recognized 9.2 BIS Certification Marking
type of hardness tester maybe used.
The material ~y also be marked with the Standard
6 FINISH Mark, \\

6.1 The axle shall be finished smooth tlee from burrs, 9.2.1 The use of the Stidard Mark is governed ‘by
scratches and other manufacturing defects. the provisions of the Bureau of Indian Stan&r&Act,
1986 and the Rules and Regulations made thereunder.
6.2 The bottom bracket axle, crank retaining bolti nuti The details of conditions under which the licence for
washer shall be entirely chemically coloured or zinc the use of Standard Mark may be granted to the
plated to Service Condition No. 2 (Classification No. manufacturers or producers maybe obtained from the
FeZn 12.5) of IS 1573, or nickel plus chromium plated Bureau of Indian Standards.
to Service Condition No. 1 with designation Fe/NilOb
-10 SAMPLING ... .
Cr r of 1S1068.
7 STRENGTH 10.1 Unless otherwise agreed to between the
supplier and the purchaser, the procedure given in
When a force is applied on the bottom bracket-axle, as IS 2500 (Part 1) shall be followed for sampling
shown in Fig. 8, with a tendency to bend/bre& it, the inspection. The inspection level, acceptable quality
force shall be not less than 2000 kgf, and the product limit (AQL) and the type of sampling plan for various
of the force and the deflection at the centre of the characteristics shall be as given in 10.1.1 and 10.1.2.
bottom “bracket axle shall not be less than 3000 kgf-
mm. 10.1.1 For shape and dimensions, workmanship and
finish a single sampling plan with Special .Inspection
8 ECCENTRICITY/RUN-OUT Level S-4 and AQL of 2.5 as given in Tables 1 and 2A
8.1 Cottered Bottom Bracket Axle of IS 2500 (Part 1) shall be followed.

The run-out measured at the end of chain-wheel side, 10.1.2 -For hardness a single sampling plan with
with supporting arrangement as shown in Fig. 9, shall Special Inspection Level S-3 and AQL of 2.5 as given
not exceed O.3 mm. in Tables 1 and 2A of IS 2500 (Part 1) shall be
followed.
8.2 Cotterless Bottom Bracket Axle
11 PACKING
When assembled in a testing bottom bracket, and fitted
with a cylindrical gauge block of 55 mm in outer’ The packing shall be as per best prevalent trade
diameter on the chain-wheel side end, the radial run- practice. The country of origin shall be marked on the
out measured on the periphery of the gauge block and packing.

2
 IS 1131:2006

4N MODEL / MANUFACTURER -----

MUDEU
MARK --- MA.,!
60° N 3=
me r
–dQ1 4’ /R4”5w&:C,,.f,,, X’,0’””rRER

io.s
L LENGTH ‘ L ‘
1

FIG. 1 COTIERED BOTTOMBRACKETAti

TabIel Dimensions of Tottered Bottom Bracket Axle

(Clause 4.1)
All dimensions in millimetres.

51 No. Length ‘L’ Left Centre Right

(1) (2) (3) (4) (5)
i) 137.5 37.4 53.6 46.5
ii) 144 36.1 61.4 46.5
iii) 158 45 65 48
iv) ... .
148 45 55 48
v) 137.5 35 55 47.5
vi) 146.5 46.4 53.6 46.5
vii) 147 39.1 61.4 46.5
NOTE — S1No. (i) -is popular ‘PH’ - Type sxle snd S1No. (ii) - is popular ‘R - Type axle.

\ f

0.5mm +
FIG. 2 ALTERNATEFOR THE SHAFIEOF THEEND OF COTIZREZIBOTrOM BaACKET AXLE
IS 1131:2006

o+ I r.
~1 L 11-
@

LEFT 1, CENTRE RIGHy I

*
n LENGTH [ L ‘M”

All dimensions in millimetres.

FIG. 3 SHAPE AND DIMENSIONSOF’BOLTTWE’CO~ s BOITGM BRACKET

Axm

Y,
i N“
. -,

Bolt
Washer
All dimensions in millimetres.

FIG. 4 CRANK RETAININGBOLT AND WASHER

MARKING ‘L’
FOR LH END
(OPTIONAL)
MARKING ‘R’ FOR
RH END (OPTIONAL)
/

oL J--II-I-X4-.-U-+
b

,4

All dimensions in millimetres.

FIG. 5 SHAPE ANO DIMENSIONSOF ‘NUT TYPE’ CoTIEIUESSBOTTOM AXLE

BRACKET

4
 IS 1131:2006

Table 2 Dimensions of Cotterless Bottom Bracket Axles

(Clauses 4.2.1 and 4.2.2)

All dimensions in millimetres.

.
S1No, ModeI Mark Length ‘L’ Left Right Centre

(1) (2) (3) (4) (5) (6)

i) 7R 134 35 42
ii) 7U 132.5 35 40.5
iii) 7T 131 35 39 57
iv) m 125 32 36

v) 7P 124 32 35

vi) 5R 132 35 42
vii) 5RM 134.5 37.5 42
viii) 5TM 131.5 37.5 39
ix) 5U 130.5 35 40.5

@ 5T 129 35 39
xi) 5s 127.5 35 37.5
55
xii) 5ss 124.5 32 37.5
xiii) 5N 123 32 36
xiv) 5P 122 32 35
xv) 5L 119 32 32
xvi) 5H 116 30.5 30.5 ,,, .
xvii) 6H1 124.5 34 35.5
xviii) 5A 119.5 32 33.5
54
xix) 6H2 128 35 39
xx) 3RMC 134.5 40.5 42
xxi) 3UMC 133 40.5 40.5
xxii) 3RMA 133 39 42
xxiii) 3RM 131.5 37.5 42
xxiv) 3UM 130 37.5 40.5
xxv) 3R 129 35 42
xxvi) 3U 127.5 35 40.5
xxvii) 3T 126 35 39
xxviii) 3s 124.5 35 37.5 52
xxix) 3PL 122 35 35
xxx) 3ss 121.5 32 37.5
xxxi) 3N -120 32 36
xxxii) 3P 119 32 35
xxxiii) 3A 117.5 32 33.5
xxxiv) 3L 116 32 32
Xxxv) 3H 113 30.5 30.5
xxxvi) 31 110.5 28 30.5

5
IS 1131:2006

ANTI SLIP MARKS

R2.5x24 NO, 1.5
(DEPTH 0.2mm) M1OX1 ,25P
T
~
014 Ua -—
lilil$ Q
-[B
7
Id -0.2
14
T Al
All dimensions issmillimebw.

FIG.6 CRANK RETAININGNWT

\ A
\
R<4.5mm

.,, ,

FIG.7 DETAJLSOF BALL TRACK -bmS’R’L=STU4.5~

FORCE

1
R8rr7

50 1A 50

FIG. 8 STRENG~TEST OF BOTTOMBRACKETAXLE

6
 “IS 1131:2006

9
.
DIAL lhlDICATOR~ . .
I
+
I

I
[
I I I

FIG. 9 RUN-OUT OF COTIEREO BOTTOMBRWKET AXLE

,., ,

,$ -
DIAL lNDICATOR~ .‘
GAUGE ,
BLOCK
r.

I I
I 1
All dimensions in millimetres.

FIG. 10 RUN-OUT
OFCorrmux ss -BOITOM BRACKETAXLE

7
IS 1131:2006

ANNEX A
(Foreword)
COMMITTEE COMPOSITION
Bicycles Sectional Committee, TED 16

Organization Representative(s)
Hero Cycles Ltd, Ludhiana SW S.K. FLu(Chairman)
SmuBSUSMOHAN LAL(Alternate)
AtlasCycles(Haryana)Limited, Sonepat SmuvrKRAMKAPUR
SmuASHOKKUMAR (Alternate)
Avery Cycle Industries Ltd (Avon Group), Ludhisma SmuHARCHAR4NSmmr
SHRIASHWANIKrJMAR (Alternate)
BHAKHAN
Avon Cycles Ltd, Ludhkma SmuONKARSmcsi PAHwA
SmuRSSHIPAHWA (Alternate)
Bhogal Sons (Regal.),Ludhirma SmuI-I.mmoERP.BHCMW
&rsuNmmosRSmGH Briww(A/temate)
Bicycle & Sewing Machines (R&D Centre), Ludhiana GENERAL MANAGES
SHRS SWHSS Sma (Alternate)
Controllerate of Qurdity Assurance (Vehicles), Ahmednagar Jomr CONTROLMR (ID-A)
DsmrrYCorvmomm (ID-A) (Alternate)
Department of Industrial Policy and Promotion, New Delhi SHRIM.M.AU KHAN
SmuB.C. NAYAK
(Alternate)
Dewan Rubber Industries Ltd, Meerut SmuVrvsx NAN
Smu C. K. SAXENA
(Alternate)
Dkector of Industries,”LudhirmajPunjab GENESAL MANAGSR
3ENSORTECHNICAL OFFICER (Alternate)
Directorate General of Supplies and Disposals, New Delhi SNRIS. M. MUNJAL
SmuW. M. WANJASU (Alternate)
Directorate of Industries, Government of Haryan~ Chandigarh SmuR. N. GoYAL
SHRISUNSL CHOPRA
(Alternate)
Eastman Industries, Ludhkna SHIUJAGOE@P Smcm
Govind Rubber Ltd, Dktt Ludhiarsa SHSJVmoDPODDAR
SmuS. P. SUKHRANS
(Alternde)
HamiltonIndustries Pvt Ltd, Ambarnath Smu M.R. hAtAPATl
SrrruP.R RAVSKUMAR
(Alternate)
Hartex Rubber Ltd, Hyderabad SmuK. SrmRAMANSAN
SHRIRAVmDRA PANT(Alternate)
J. K. Cycles, Ludhiana SHRJJOmNDER KUMAR
KularCycle Industries,Ludhkma SHSJAnT Smmr
SmuDASSHAN Sma (Alternate)
MetroTyres Limited, Ludhkwa SmuL. K. MA_rswa
SW SANSEEV SOOD(A/ternate)
Nova Bicycle Industries,Ludhiana SHRIHARMmDaR Smca+PAHWA
Smu ROHITPAHWA (Alternate)
Otlice of the Development Commissioner (SS1),New Delhi Smu R. L. GARG
SHRS M. B. JAYAKGMAR(Alternate)
Ralson (India) Limited, Ludhisma Smu SANISZVPAHWA
SrrruT. R. KUtUJA (Alternate)
SademIndustries,Ludhkna Smu SATSSHKIJMARDHANDA
SethIndustrialCorporation,Ludhkna SHIUB.K. SmM
T. I. Cyclesof Indi~ Chemai SmUS.%401SHKSJMAR
SHRSV. Duswrw (Afternate)
UnitedCycle& PartsManufacturersAssociation,Ludhiana THEPrwsrosrvr
THSSECRETARY (Afternafe)
BIS Directorate Generrd Smu S. K. BHATSA, Director & Head (TED)
[Representing Director General (Ex-oflcioh4ensber)]

MemberSecretary
Smu J. M. KHANNA
Joint Dkector (TED), BIS

8
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 standardization, marking and quality certification of goods and
attending to connected matters in the country.

Copyright

J31Shas the copyright of all its publications. No part of these publications may be reproduced in any form
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 (Publications), 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 is reaffirmed 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 Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from .Doc: No. TED 16 (397).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

,,

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002

Telephones: 23230131,23233375,2323 9402 website: www.bis.org.in

Regional Offices: Telephones

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg 23237617

NEW DELHI 110002 { 23233841

Eastern : 1/14 C.I.T. Scheme VII M, V.I.P. Road, Kankurgachi 23378499,23378561

KOLKATA 700054 { 23378626,23379120

Northern : SCO 335-336, Sector 34-A, CHANDIGARH 160022 2603843

{ 2609285

Southern : C.I.T. Campus, IV Cross Road, CHENNAI 600113 22541216,22541442

{ 22542519,22542315

Western : Manakalaya, E9 MIDC, Marol, Andheri (East) 28329295,28327858

MUMBAI 400093 { 28327891,28327892

Branches : AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. F,4RIDABAD.

GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR.
NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM. VISAKHAPATNAM.

Printed at Simco Printing Press, Delhi