Machinery's Handbook, 31st Edition
Synchronous Belts
2609
Table 40. Synchronous Belt Nominal Tooth and Section Dimensions ANSI/RMA IP-24, 1983
b t
r r r a
h t
β
h d
β
r r r a
β
r r r a
h s
h t
h t
b t
b t
Double-Sided Belts
Single-Sided Belts
Belt Section (Pitch)
Belt Section (Pitch)
h t h d MXL (0.080) 40 0.020 0.045 0.005 0.005 0.045 … XXH (1.250) 40 0.375 0.750 0.060 0.090 0.62 … XL (0.200) 50 0.050 0.101 0.015 0.015 0.090 … DXL (0.200) 50 0.050 0.101 0.015 0.015 … 0.120 L (0.375) 40 0.075 0.183 0.020 0.020 0.14 … DL (0.375) 40 0.075 0.183 0.020 0.020 … 0.180 H (0.500) 40 0.090 0.241 0.040 0.040 0.16 … DH (0.500) 40 0.090 0.241 0.040 0.040 … 0.234 XH (0.875) 40 0.250 0.495 0.047 0.062 0.44 … All dimensions in inches. Table 41. Synchronous Belt Standard Pulley and Flange Dimensions ANSI/RMA IP-24, 1983 b f b t r a r r h s h d h t b t r a r r h s b ´ f 0.03 in. max. rad. 8° min 15° max
Break corner
Flange height
Flange outside diameter
Flange thickness
Pulley outside diameter
Flanged Pulley
Flange Dimensions
Unflanged Pulley
Minimum Pulley Width
Flange
Belt Section
Standard Nominal Pulley Width
Standard Pulley Width Designation
Flanged b f
Unflanged b ′ f Thickness (min) Height a (min)
MXL
0.25 0.38 0.50 0.75 1.00 1.00 1.50 2.00 3.00 2.00 3.00 4.00 2.00 3.00 4.00 5.00
025 037 050 075 100 100 150 200 300 200 300 400 200 300 400 500
0.28 0.41 0.55 0.80 1.05 1.05 1.55 2.08 3.11 2.23 3.30 4.36 2.23 3.30 4.36 5.42
0.35 0.48 0.67 0.92 1.17 1.23 1.73 2.26 3.29 2.46 3.50 4.59 2.52 3.59 4.65
0.023 0.029
0.020 0.040
XL
L
0.050
0.065
H
0.050
0.080
XH
0.098
0.190
XXH
0.127
0.245
5.72 a Flange outside diameter equals pulley outside diameter plus twice flange height.
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