Machinery's Handbook, 31st Edition
Belt Storage, Handling, and Service Factors 2605 Table 37. SAE V-Belt and Pulley Dimensions 1 32 W K min R
d
X
D
A
S
A Groove Angle (deg) ± 0.5
S Groove c Spacing ( ± 0.015)
W Eff. Groove Width
d Ball or Rod Dia ( ± 0.0005)
D Groove Depth Min
2 K 2 × Ball Extension 2 X b
SAE Size 0.250 0.315 0.380 0.440 0.500
Recommended Min. Eff Dia a
2.25 2.25 2.40 2.75 3.00 3.00
36 36 36 36 36 34 36 38 34 36 38 34 36 38 34 36 38
0.248 0.276 0.315 0.354 0.380 0.433 0.441 0.512 0.500 0.551 0.597 0.551
0.2188 0.2812 0.3125 0.3750 0.4375
0.164 0.222 0.154 0.231 0.314 0.258 0.280 0.302 0.328 0.352 0.374 0.472 0.496 0.520 0.616 0.642 0.666
0.04 0.05 0.06 0.07 0.08 0.00
0.315 0.413 0.541 0.591 0.661 0.778
0.500
11 ∕ 16
Over 4.00 Over 6.00
3.00
0.660 0.630
0.5625
0.02
0.841
3 ∕ 4
Over 4.00 Over 6.00
3.50
0.785 0.709
0.6875
0.04
0.966
7 ∕ 8
Over 4.50 Over 6.00 Over 6.00 Over 8.00 4.00
1
0.910 0.827
0.8125
0.06
1.091
All dimensions in inches. a Pulley effective diameters below those recommended should be used with caution, because power transmission and belt life may be reduced. b The X dimension is radial; 2 X is to be subtracted from the effective diameter to obtain “pitch di - ameter” for speed ratio calculations. c These values are intended for adjacent grooves of the same effective width ( W ). Choice of pul- ley manufacture or belt design parameter may justify variance from these values. The S dimension should be the same on all multiple groove pulleys in a drive using matched belts. © 1990, SAE, Inc. 3) Do not store belts near electrical devices that may generate ozone (transformers, elec tric motors, etc.). 4) Do not store belts in areas where solvents or chemicals are present in the atmosphere. Belts should be stored in a cool, dry environment. When stacked on shelves, the stacks should be short enough to avoid excess weight on the bottom belts, which may cause dis tortion. When stored in containers, the container size and contents should be sufficiently limited to avoid distortion. V-Belts: A common method is to hang the belts on pegs or pin racks. Very long belts stored this way should use sufficiently large pins or crescent-shaped “saddles” to prevent their weight from causing distortion. Joined V-belts, Synchronous Belts, V-Ribbed Belts: Like V-belts, these belts may be stored on pins or saddles with precautions taken to avoid distortion. However, belts of this
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