IS 9804-1: Synchronous Belt Drive Belts, Part 1: PITCH CODES MXL, XL, l, H, XH AND XXH - METRIC AND INCH DIMENSIONS

2009·5.1 MB·English

by  Bureau of Indian Standards

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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 9804-1 (2009): Synchronous Belt Drive Belts, Part 1:
PITCH CODES MXL, XL, l, H, XH AND XXH - METRIC AND INCH
DIMENSIONS [PGD 29: Pulleys and Belts]
“!ा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””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 9804 (Part 1):2009
ISO 5296-1 :1989
(Superseding IS9804:1981)

'BPT 1 ftrq ~ MXL, XL, L, H,XH ~ XXH- 41RCh ~ ~ Z1WfllT
r
Indian Standard
SYNCHRONOUS BELT DR~VES - BELTS
PART 1 PITCH CODES MXL, XL, l, H, XH AND XXH - METRIC AND INCH DIMENSIONS
( First Revision)
ICS 21.220.10
© SIS 2009

BUREAU OF INDIAN STANDARDS
MANAK SHAVAN, 9 SAHADUR SHAH ZAFAR MARG
oooz
NEWDELHI11
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Ii May 2009 PriceGroup4
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{gS;9300{lFsti ~} : 2009
~so 52S~~ : ~9139 .
indian Standard
SYNCHRONOU,S BELT DR~VES - BELTS
PART 1 P~TCD-lJ CODES MXn., >tn., l, Hl, XH AI\lID }{XHI - MlETlAtCAND ~NCti lDiMENS~O~S
( First Revision)
11 .Scope Table 1 - Pitch codes
Thispart of ~so 5296specifies the principal characteristics of ." Beltpifcll"I
Pitchcode
synchronousendlessbeltsfor useinsynchronousbelt drives11 mm in
formechanicalpowertransmissionandwherepositiveindexinq
or synchronization mayberequired. MXL 2,032 "t' 0,080
XL 5,080 0,200
L 9,525 0,375
The principal characteristics include
H " 12,700 -, 0,500
XH 22,225 0,875
al nominal tooth dimensions; XXH 31,750 1,250
bl length andwidth dimensions; *1 CarriedJto third decimalplace becausebelt pitch isa defined
value.
cl tolerances on thesedimensions;
d) length-measurement specifications.
3 Dimensions and tolerances
This part of ISO5296appliesto synchronous belt driveswith
pitch codes MXL, XL, L, H,XH andXXH.and to metric and 3.1 Tooth dimensions
inch dimensions.
The nominal belt toothdimensionsarethe samefor one-sided
anddouble-sided belts;theyaregivenintable2andareshown
infigures Ia), lb),and Ic).
2 Pitch codes
Two typesof double-sidedsynchronousbeltsarestandardized.
Thepitch codesandthecorresponding beltpitchesaregivenin type A [seefigure lb))hassymmetrical teeth and type 8 [see
table 1. figure tell hasstaggeredteeth.
Table2 - Nominal tooth dimensions
S h, r, r,
2fl "
Pitch code
degrees mm in mm in mm in mm in
MXL 40 1,14 0,045 0,51 0,02 0,13 0,005 0,13 0,005
mo XL 50 2,57 0,101 1,27 0,05 0,38 0,015 0,38 0,Q15
ao L 40 4,65 0,183 1,91 0,075 0,51 0,02 0,51 0,02
H 40 6,12 0,241 • 2,29 0,09 1,02 0,04 1,02 0,04
z
in XH 40 12,57 0,495 6,35 0,25 1,57 0,062 1,19 0,047
iii XXH 40 19,05 0,75 9,53 0,375 2,29 0,09 1,52. 0,06
....
e-
I'
....
1) Synchronousbelt drives have been known byvarioustitles inthe past:for example, timing belt drives,positive belt drives, gearbelt drives.
IS ~(Pari1) :2009
~SO 5296-1 : 1989
___,..,1_
I
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'"
Ul
I -
I',
I I
1 _J
s) One-sided synchronous belt bl Double-sided synchronous belt
Type A. symmetrical teeth
I
.L
I
I
t7-(qJ I
. ---- ... .--1
_.~
cl Double-sided synchronous belt _
Type B. staggered teeth

Figure 1 - Tooth profile
2
ts 9804>(lParrl1l1) : 2009
~SO 5298-11 : ~989
3.2 lL(sll1Ig1t~s
The belt pitch lengths and tolerancesare givenintables 3a)and 3b).
Table38) - fitch ~angthsand tolerances
Beltlength Pitchlength Tolerance Numberofteeth
designation mm in mm in XL L H XI-I XXH
60 152,4 6 ±0,41 ±O,016 30
----- 70 1n.8 7 ±0,41 ±O,O16 35
80 203,2 8 ±0,41 ±O,016 40
lID 228,6 9 ±0,41 ±O,O16 45 I
100 254 10 ±OAl ±O,O16 50
~- .
110 279,4 11 ±O.46 ±0,018 55 I
120 304,8 12 ±O,46 ±O,O18 60
124 314,33 12,375 ±O,46 ±O,O18 33 I
130 330,2 13 ±O,46 ±O,O18 65 [ ,
oI 140 355,6 14 ±O,46 ±O,O18 70 , II
f---~
150 381 15 ±O,46 ±O,O18 75 I 40 I
160 406,4 16 ±0,51 ±O,02 80 .
170 431,8 17 ±O,51 ±O,02 85
180 457,2 18 ±0,51 ±O,02 90
187 476,25 18,75 ±O,51 ±O,02 50
1lID 482,6 19 ±O,51 ±O,02 95
200 508 20 I ±O,51 ±O,02 100
210 533,4 21 I ±O,61 ±O,024 105 56
220 558,8 22 ±O,61 ±O,024 110 I
225 571,5 22,5 ±0,61 ±O,024 60
230 584,2 23 ±0,61 :t:O,024 115
.1r 224500 660395,6 2245 ±±00,,6611 ±±OO,,002244 112205 64 48
255 647,7 25,5 ±O,61 ±O,024 68
260 660,4 26 ±O,61 ±O,024 130
270 685,8 27 ±O,61 ±O,024 72 54
285 723,9 28,5 ±O,61 ±O,024 76
300 762 30 , ±O,61 ±O,024 80 60
322 819,15 32,25 ±O,56 ±O,026 86
330 838,2 33 ±O,66 ±O,026 66
345 876,3 34,5 ±O,66 ±O,026 92
360 914,4 36 ±O,66 ±O,026 72
367 933,45 36,75 ±O,66 ±O,026 I 98
3492D0 1096960,,68 3492 ±±OO,,6766 ±±OO,,00236 110142 I, 8784 I
~.
450 1143 45 ±O,76 ±O,03 120 90
480 1219,2 48 ±O,76 ±O,03 128 96
507 1289,05 50,/5 ±O,81 ±O,032 58
510 1295,4 51 ±0,81 ±O,032 136 102
540 1371,6 54 ±O,81 ±O,032 144 108
560 1422,4 56 ±O,81 ±O,032 64
570 1447,8 57 ±O,81 ±O,032 ,14
600 1524 60 ±0,81 ±O,032 160 120
630 1600,2 I 63 ±0,86 ±0,034 I 126 72
660 1676,4 . 66 +0,86· +0,034 I 132
A 1--..
700 1TI8 70 ±O,86 ±O,O34 I 140 80 56
II n75o0 11995055,8 n75 ±±OO,,9911 ±±O0,,003366 I 150 88 ,r
I 800 2032 80 ±0,91 ±0,036 160 64
840 2133,6 84 +0,97 +0,038 I 96
;...---
850 2159 85 ±O,97 ±O,O38 170
goo 2286 90 ±0,97 ±0,038 180 72
980 2489,2 98 ±l,02 ±0,04 112
1000 2540 100 ±l,02 ±0,04 200 80
1100 2794 110. ±1.07 ±0,O42 220
1120 2844,8 112 ±1,12 ±0,044 128
1200 3048 120 ±1,12 ±0,044 96
1250 3175 125 ±1,17 ±0,046 250
1260 3200,4 126 ±1,17 ±O,046 144 I
1400 3556 140 ±1,22 ±O,O48 I 280 , 160 112
1540 3911,6 154 ±1,32 ±0,052 I 176
1600 4064 160 ±1,32 ±0,052 128
1700 4318 170 ±1,37 ±O,O54 340
1750 4445 175 ±1,42 ±O,O56 I 200
1SOl) 4572 180 ±1,42 ±O,056 I 144
IS 9804 (Part 1) : 2009
ISO 5296~1 : H)89
Table 3b) - Pitch lengths and tolerances - Pitch code MXL
I ~';f:::-l
Pitch ltmgth Tolerance
Belt length _ ~~___ ~M___ -. -- .. .. .. .- . - .. Numb
designation mm in nun in
-
36,0 91,44 3,6 ~0,41 ::l0,016 45
40,0 101,0 4 t.0.41 to,016 50
44,0 111,76 4,4 t0,41 t.O,OlG Sb
48,0 121,92 4,8 tO,4'j 2-0,016 60
S-S,O 142,24 5,6 +0.41 i 0,016 ICJ
_._ .- -- - .. -- .. -- .. r -.- - ... -. - - .··tI .- . . - . - -
---_._-~
60,0 152,4 6 +-0,41 I t 0,01(- 75
64,0 162,fJB J 64 i 0,41 rO,Oi6 80
72,0 182,88 I 7" to,41 I -t O,Olr; 00
80,0 203.2 8 lO,41 I ; 0 \)16 100
8:8,0 223,52 I B.B 10,41 {- .:OJ)lf; 110
--~ ~-~. .- 100_.,0~ . - .~-- 2S4 jI 10 ..' 041 . ' 0,016 12£t
112,0 2134,48 I 11,2 j 0.46 I 10,018 140
124,0 314% I 12.4 -t 0,46 j 0,0113 155 II
140,0 3!J(),b 14 ' 0,46 I +0,018 175
1·-..... 160,0 ·0,02 I . .200 -1
225- .. - . .. -
100,0 1___
I
200,0 25(1_, 1
3.3 Widths and heights
Thebell widths and tolerances are!:Jiven in table4a). 1henominal neiqhts for onasided belts arealso qiven 111 table4al, while the
nominal heights for double-sidedbelts aregiven In table 4b)
Table 4al _.. Widths and heights
Wid:.h~
Nominal height
Pitch code .seefigure 1ell
DInJallSIOn
1- i
rnrn In
v",04~ol
I
-_._+-
MXL i,14 J
I
XL 2,3 0,08
--_._- -- I'
L _~
--1-
3,1). 14
H 43
"

4
is 9804 (Part1): 2009
ISO 5296-1 : 1989
Table4bl - Heights EXAMPLE
r
I Nominalheight Atype 8 synchronous belt ofpitch length98 in (2439,2 mrnl,
Isoe figures1bl and lell pitch0,875in 122,225 mrnland nominalwidth2 in150,8mmlis
Pitch code 1_ -_..- - designated:
."..r,=-d _
mm in
DB 900 XH 200
MXL 1,53 0,06
XI 3,05 0.12
l 4,58 0,'18
H 5,95 0,234 4.3 Designation of pitch length of
XI-{ 15,49 0,61 non-standardized lengths
XXH 22,11 0,87
The length designation for belts in non-standardized lengths
thatarenotcontamed in tables3al and 3blshall beestablished
from the pitch length in millimetres divided by 2,54. Th.s
4 Belt designation number shall be rounded:
3) for belts with pitch code MXL to the first decimal: for
4.1 One-sided belts example belt MXL with 102 teeth corresponding to pitch
length 207,26 rnrn: length designation 81..6,
'1he ~)elt designation Includes, III order, theItlngtr. designation
"cGuldlfl!:lto table"3;;) anti 3bl, the pitch code accordinq to b) tor belts with pitch codes XL to XXH to lhp. nearest
!.:!blf' 1and the width dP'<;IOlliltioll 3Ll:Ordlll\J to table 4aJ. integralnumber, where0,5willberoundeddown, fnTlJ'X81J)·
ple belt l with 130 teeth corresponding to pitch lenpth
EXAMPLf:S 1238,25 rnrn: length designation 487
A synchronous bell of pitch length 7,2 in !182,8B mm), pitch
0,080 Ifl (2,032 mrn) and nominal width 0,19 in 14,8 mm) is
desiqnated:
5 Pitch length measurement
12,0 MXL019
A synchronous belt of puch Ienqth 42 ir. {I 066,8 mm), pitch 5.1 Measuring fixture [see figUfe 3)
n375 in (9,525 nun) and nornrnal width 0,5 in 112.7mm) is
rlt'<;lgnated Thepitch length of asynchronous belt shall be deterrmnad D'r
placingthe belt on ameasunnqfixturecomposedof thefollow
.120L050
ing elements,
!> synchronous belt 01pm.h lenglh 98 ;11 {2489,2 mml, pitch
D,g?!:- iI, !?2,725 Il1ml <inti nominal width 2 in (50.8 mrnl is
5.1.1 T\,ILv'c pullevs of equal diameter asspecitred in 1:tblo[) ~.
(k.:5ltJ11JIeel;
of the proper pitch code, and having standard tooth space
900 XH 200 dimensions. These pulleys sh<J1I be made to the tolerances
shown In table5 and have theproperClearance, e"" betweeo
the pulley loath space and the theoretical belt tooth Width 35
4.2 Double-sided belts specified In table 5 (see figure2J. One pulley shaJl br:: free to
rotate on afixed-positionshaft, whiletheothershall beIwe 10
rotate on a movable shaft to permit the centre distallce to
if 21 Type A - Symmetrical
change.
The bel! rlt>s,gnat;on fm tvpe A belts correspondrnq to
ilgurc lbll,.eludes, inorder, the ietter D, fordouble-sided, the
5.1.2 Means of applying a total measuring terce 10 the
tYP0 dr-siqnatian. the length dl'l>ignallon, the pitch code, and
movable pulley
the width onsignalion,
Ll(AMPi.E
5.1.3 Means of measuring the centre distance butween
A typeA s'{nChrOfldusbelt of pitch length42 in (1 066,8 rnm), the twopulleyswiththe necessary degree of accuracy tocheck
pitch 0,375 III t9,&2bmml and nominal width0,5 in 112,7 rnrnl the allowed tolerancesItolerancesforcentredistancemeasure
j<;designat':'d' ment will be one-half of theallowed length tolerancesaccord
ing to tables3al and 3bll.
DA420 l ()5{)

4.2.:? Type B - Staggered
Fhe belt desiqnatrcn for type B belts conespondinq to The total measuring force to be applied fOI measuring bells is
figure 1C) IS similar to 4.2.1except that a B replaces theA. given in table 6.
5
.
~s g®~~~Blu1t 1]) : 2(Q)(Q)~
~SO 52Sl($..1] : 1]9$9
The pitch length shall be calculated by adding the pitch cir
cumferenceof oneof thepulleysto twicethemeasuredcentre
In measuring the pitch length of a synchronous belt, the belt distance.
shallberotated atleasttwo revolutionstoseatitproperlyand
todividethetotaiforceequallybetween thetwostrands ofthe Checkdouble-sided belts on both tooth faces.
belt.
1f--lf--i:=-Totalmeasuring
force
,
i
I _
1-:0- Centre-d-is-t-an-c1e I<:"...j
Figure 2 - Clearance between measuring pulley and belt Figure3 - Pitch length measuring fixture
Table5 - Belt pitch le~gth measuring [pulleys
.
Minimum
Pitch clearance
Pitch Num.ber Outside diameter Radialrun-out Axial run-out
code ofteeth circumference TIR11 TIRll em
mm in mm in mm in mm ir. mm I in
12,428 0,4893
MXl 20 40,64 1,6 0,013 0,0005 0,02.5 0,001 0,25 0,01
±O,013 ±O,OOO5
15,662 0,6166
XL 1.0 50,8 2 ±O,013 , ±O,OOO5 0,013 0,000 5 0,025 0,001 0,3 0,012
L 16 I 152,4 6 47,748 1,8799 0,013 0,0005 0,025 0,001 0,33 0,013
±O,O13 ±O,OOO5
H 20 254 10 79,479 3,129 1 0,013 O,COO5 0,025 0,001 0,38 0,015
±O,013 ±O,OOO5
.
166,992 6,5745
XH 24 533,4 21 0,013 0,0005 0,05~ 0,002 0,53 I 0,021
±O,025 ±O,001
239,504 9,4293
XXH 24 762 30 0,013 0,0005 0,Q76 0,003 0,64 0,025
±O,025 ±O,001
1} Totalindicatorreading (maximum)