Table 2b. Narrow V-Belt Standard Sheave and Groove Dimensions ANSI/RMA IP-22 (1983) Deep Groove Dimensions a
Design Factors
Groove Angle, α , ± 0.25 deg
Min Recommended OD
Cross Section
Deep Groove Outside Diameter Up through 3.71 Over 3.71 up to and including 6.22 Over 6.22 up to and including 12.22 Up through 10.31 Over 10.31 up to and including 16.32 Over 12.22 Up through 16.51 Over 16.51 up to and including 22.92 Over 16.32
S g b ± 0.015
b g ± 0.005
b e (Ref)
h g (Min)
R B (Min) 0.070 0.073 0.076 0.078 0.168 0.172 0.175 0.312 0.316
d B ± 0.0005
2 a
2 h e
S e
36 38 40 42 38 40 42 38 40 42
0.421 0.425 0.429 0.434 0.710 0.716 0.723 1.180 1.191 1.201
0.375 (+0.094, − 0.031)
3V
0.350 0.449
0.3438
0.500
2.87
0.050
0.218
0.562 (+0.125, − 0.047)
5V
0.600 0.750
0.5938
0.812
7.42
0.100
0.320
0.844 (+0.250, − 0.062)
8V
1.000 1.252
1.0000
1.312
13.02
0.200
0.524
Over 22.92 0.321 a Deep groove sheaves are intended for drives with belt offset such as quarter-turn or vertical shaft drives. They may also be necessary where oscillations in the center distance may occur. Joined belts will not operate in deep groove sheaves. b Summation of the deviations from S g for all grooves in any one sheave should not exceed ±0.031 in. The variations in pitch diameter between the grooves in any one sheave must be within the following limits: Up through 19.9 in. outside diameter and up through 6 grooves—0.010 in. (add 0.0005 in. for each additional groove). 20.0 in. and over on outside diameter and up through 10 grooves—0.015 in. (add 0.0005 in. for each additional groove). This variation can be obtained by measuring the distance across two measuring balls or rods placed in the grooves diametrically opposite each other. Comparing this “diameter over balls or rods” measurement between grooves will give the variation in pitch diameter. Other Sheave Tolerances Outside Diameter Radial Runout a Axial Runout a Up through 8.0 in. outside diameter ± 0.020 in. Up through 10.0 in. outside diameter 0.010 in. Up through 5.0 in. outside diameter 0.005 in. For each additional inch of outside diameter add ± 0.0025 in. For each additional inch of outside diameter add 0.0005 in. For each additional inch of outside diameter add 0.001 in.
a Total indicator reading. All dimensions in inches.
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