PowerGrip® GT® Belt Drives

Synchronous Belt Drives – Belt Specifications
General Belt Tolerances (Except Twin Power ® and Long-Length Belting)
Gates belt length and width tolerances for synchronous belts are based upon
industry standard RMA (Rubber Manufacturers Association) tolerances.
Table 15 – Center Distance Tolerances
Belt Length
Center Distance Tolerance
(in) (mm) (in) (mm)
Up to 10 254 ±.008 ±.20
Over 10 254
To 15 381
±.009 ±.23
Over 15 381
To 20 508
±.010 ±.25
Over 20 508
To 30 762
±.012 ±.30
Over 30 762
To 40 1016
±.013 ±.33
Over 40 1016
To 50 1270
±.015 ±.38
Over 50 1270
To 60 1524
±.016 ±.41
Over 60 1524
To 70 1778
±.017 ±.43
Over 70 1778
To 80 2032
±.018 ±.46
Over 80 2032
To 90 2286
±.019 ±.48
Over 90 2286
To 100 2540
±.020 ±.51
Over 100 2540
To 110 2794
±.021 ±.53
Over 110 2794
To 120 3048
±.022 ±.56
Table 16 – Belt Width Tolerances
Belt Length
0 to 33 in. 33.01 to 66 in. Over 66 in.
Belt Width (0 to 838mm) (839 to 1676mm) (1676mm)
(in) (mm) (in) (mm) (in) (mm) (in) (mm)
From 0.125 3 +0.016 +0.4 +0.016 +0.4 - -
To 0.438 11 -0.031 -0.8 -0.031 -0.8
Over 0.438 11 +0.031 +0.8 +0.031 +0.8 +0.031 +0.8
To 1.500 38.1 -0.031 -0.8 -0.047 -1.2 -0.047 -1.2
Over 1.500 38.1 +0.031 +0.8 +0.047 +1.2 +0.047 +1.2
To 2.000 50.8 -0.047 -1.2 -0.047 -1.2 -0.063 -1.6
Table 17 – Overall Belt Thickness Dimensions
Pitch Belt Overall Thickness (ref.)
Code Pitch (in.) (mm)
2M GT 2mm .060 1.52
3M GT 3mm .095 2.41
5M GT 5mm .150 3.81
3M HTD 3mm .095 2.41
5M HTD 5mm .150 3.81
MXL .080 in. .045 1.14
.0816 .0816 in. .045 1.14
XL .200 in. .090 2.29
Table 18 – Overall Belt Thickness Tolerance
Standard Class 2 Class 1
±0.015 in. ±0.010 in. ±0.005 in.
±0.38mm ±0.25mm ±0.13mm
NOTE: Belts with pitch lengths greater than 5.5 in. (140mm) are furnished with a Class II grind
unless otherwise specified. Belts with pitch lengths less than 5.5 in. (140mm) are unground and
produced to standard tolerances.
NOTE: A class 1 grind is available at additional cost for finished belts only.
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