Table 9. Classical V-Belt Sheave and Groove Dimensions ANSI/RMA IP-20, 1988
α
h d
R B
b g b d
a p
d B
h g
S e
S g
Face width of standard and deep groove sheaves = S g ( N g – 1) + 2 S e , where N g = number of grooves Standard Groove Dimensions
Design Factors
Datum a Diameter Range
S g b ± 0.025
Cross Section A, AX
α Groove Angle ± 0.33 °
Min Recom. Datum Diameter 2 a p
d B ± 0.0005
b d Ref
h g Min 2 h d
R B Min
b g
S e
0.494 0.504 0.637 0.650 0.612 0.625 0.612 0.625 0.879 0.887 0.895 1.259 1.271 1.283
0.148 0.4375
+ 0.090 − 0.062 + 0.120 − 0.065
A 3.0 AX 2.2 B 5.4 BX 4.0 A 3.6 c AX 2.8 B 5.7 c BX 4.3
Through 5.4
34 38 34 38 34 38 34 38 34 36 38 34 36 38
0.418
0.625 0.375
0
± 0.005 0.460 0.250
0.149
( 7 ∕ 16 )
Over 5.4
0.189 0.5625
Through 7.0
B, BX
0.530
0.750 0.500
0
± 0.006 0.550 0.350
0.190
( 9 ∕ 16 )
Over 7.0
0.634 e 0.230 0.602 e 0.226 0.333 e 0.230 0.334 e 0.226
A, AX Belt B, BX Belt
Through 7.4 c
0.37
± 0.006
Over 7.4
0.5625 ( 9 ∕ 16 )
0.508 d
0.612
0.750 0.500 +0.120 − 0.065
Through 7.4 c
− 0.01
± 0.006
Over 7.4
0.274 0.276 0.277 0.410 0.410 0.411
Through 7.99 Over 7.99 to and incl. 12.0 Through 12.99 Over 12.99 to and incl. 17.0 Over 12.0
0.7812 ( 25 ∕ 32 )
C 9.0 CX 6.8
C, CX
0.757
1.000 0.688 +0.160 − 0.070
0
± 0.007 0.750 0.400
1.1250 (1 1 ∕ 8 )
1.438 0.875 + 0.220 − 0.080
D
1.076
13.0
0
± 0.008 1.020 0.600
Over 17.0
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