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V-Belt Standard Datum Length per. ANSI/RMA IP-20 Table

Belt Drive Design and Engineering
Mechanical Gear Design and Engineering

Classical V-Belt Standard Datum Length for design per. ANSI/RMA IP-20

Standard
Length
Designation
Standard
Datum
lengths
Permissible
Deviations
from Std.
Datum Length
Matching Limits
for One Set
Cross Section
A, AX
B, BX
C, CX
D
26
27.3
+0.6,
−0.6
0.15
31
32.3
+0.6,
−0.6
0.15
35
36.3
36.8
+0.6,
−0.6
0.15
38
39.3
39.8
+0.7,
−0.7
0.15
42
43.3
43.8
+0.7,
−0.7
0.15
46
47.3
47.8
+0.7,
−0.7
0.15
51
52.3
52.8
53.9
+0.7,
−0.7
0.15
55
56.3
56.8
+0.7,
−0.7
0.15
60
61.3
61.8
62.9
+0.7,
−0.7
0.15
68
69.3
69.8
70.9
+0.7,
−0.7
0.30
75
75.3
76.8
77.9
+0.7,
−0.7
0.30
80
81.3
+0.7,
−0.7
0.30
81
82.8
83.9
+0.7,
−0.7
0.30
85
86.3
86.8
87.9
+0.7,
−0.7
0.30
90
91.3
91.8
92.9
+0.8,
−0.8
0.30
96
97.3
98.9
+0.8,
−0.8
0.30
97
98.8
+0.8,
−0.8
0.30
105
106.3
106.8
107.9
+0.8,
−0.8
0.30
112
113.3
113.8
114.9
+0.8,
−0.8
0.30
120
121.3
121.8
122.9
123.3
+0.8,
−0.8
0.30
128
129.3
129.8
130.9
131.3
+0.8,
−0.8
0.30
144
145.8
146.9
147.3
+0.8,
−0.8
0.30
158
159.8
160.9
161.3
+1.0,
−1.0
0.45
173
174.8
175.9
176.3
+1.0,
−1.0
0.45
180
181.8
182.9
183.3
+1.0,
−1.0
0.45
195
196.8
197.9
198.3
+1.1,
−1.1
0.45
210
211.8
212.9
213.3
+1.1,
−1.1
0.45
240
240.3
240.9
240.8
+1.3,
−1.3
0.45
270
270.3
270.9
270.8
+1.6,
−1.6
0.60
300
300.3
300.0
300.8
+1.6,
−1.6
0.60
330
330.9
330.8
+2.0,
−2.0
0.60
360
380.9
360.8
+2.0,
−2.0
0.60
540
540.8
+3.3,
−3.3
0.90
390
390.9
390.8
+2.0,
−2.0
0.75
420
420.9
420.8
+3.3,
−3.3
0.75
480
480.8
+3.3,
−3.3
0.75
600
600.8
+3.3,
−3.3
0.90
660
660.8
+3.3,
−3.3
0.90

All dimensions in inches.
Lengths are specified by "Standard Length Designation" and length, e.g. CX60

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