Machinery's Handbook, 31st Edition
Synchronous Belts
2611
Table 43. Synchronous Belt Standard Widths and Tolerances ANSI/RMA IP-24, 1983
Standard Belt Widths
Tolerances on Width for Belt Pitch Lengths
Belt Section
Up to and including 33 in.
Over 33 in. up to and including 66 in.
Designation
Dimensions
Over 66 in.
012 019 025 025 037 050 075 100 075 100 150 200 300 200 300 400 200 300 400
0.12 0.19 0.25 0.25 0.38 0.50 0.75 1.00 0.75 1.00 1.50 2.00 3.00 2.00 3.00 4.00 2.00 3.00 4.00
+0.02 − 0.03 +0.02 − 0.03 +0.03 − 0.03 +0.03 − 0.03 +0.03 − 0.05 +0.05 − 0.06
MXL (0.080)
…
…
XL (0.200)
…
…
+0.03 − 0.05 +0.03 − 0.05 +0.05 − 0.05 +0.06 − 0.06 +0.19 − 0.19
L (0.375)
…
+0.03 − 0.05 +0.05 − 0.06 +0.06 − 0.08 +0.19 − 0.19
H (0.500)
XH (0.875)
…
+0.19 − 0.19
XXH (1.250)
…
…
500 5.00 Widths: Standard belt widths, width designations, and width tolerances are shown in Table 43. Length Determination: The pitch length of a synchronous belt is determined by placing the belt on a measuring fixture having two pulleys of equal diameter, a method of applying force, and a means of measuring the center distance between the two pulleys. The position of one of the two pulleys is fixed and the other is movable along a graduated scale. Synchronous Belt Pulley Diameters: Table 44 lists the standard pulley diameters by belt section (pitch). Fig. 13 defines the pitch, pitch diameter, outside diameter and pitch line differential.
Pitch (circular pitch)
Belt pitch line
Belt tooth
a
Pulley groove
a = Pitch line differential
Fig. 13. Synchronous Belt Pulley Dimensions
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