Adjustable Center Drives
Series 21 Standard V-Belt Drives: 5M
 
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5M - 2.5:1 Speed Ratio
H.P.: 3/4 Motor Speed: 1800 RPM
H.P.: 1/2Motor Speed: 1200 RPM
series 21 dimensional drawing
A
1-11/16
B
1-3/8
C
1-11/16
D
5
E
2-15/16
L
3-5/8
Std. bore
1/2 | 5/8 | 3/4
keyway
1/8 | 3/16 | 3/16
bore depth
Through
max bore
3/4
belt size
A
max. p.d.
4.7
min p.d.
1.85
weight
2.375 lb.
Driven Speeds
Driven
Sheave
Pitch
Diameter
Belt vs Minimum Center Distance
1800 RPM Motor
1200 RPM Motor
A 26
A 31
A 35
A 38
A 46
A 55
A 68
A 80
A 85
A 96
A 105
Max.
Min.
Max.
Min.
2115
846
1410
564
4.0
6.8
9.3
11.3
12.8
16.8
21.3
27.8
36.8
36.3
41.8
46.3
1692
676
1128
451
5.0
6.0
8.5
10.5
12.0
16.0
20.5
27.0
33.0
35.5
41.0
45.5
1410
564
940
376
6.0
7.7
9.7
11.2
15.2
19.7
26.2
32.2
34.7
40.2
44.7
1208
483
805
322
7.0
6.9
8.9
10.4
14.4
18.9
25.4
31.4
33.9
39.4
44.0
1057
423
704
281
8.0
8.0
9.5
13.6
18.1
24.6
30.6
33.1
38.6
43.1
640
376
626
250
9.0
8.6
12.7
17.3
23.8
29.8
23.3
37.8
42.3
846
338
564
225
10.0
11.8
16.4
23.0
29.0
31.5
37.0
41.5
769
307
512
205
11.0
10.9
15.5
22.1
28.1
30.7
36.2
40.7
705
282
470
188
12.0
9.7
14.6
21.2
27.3
29.8
35.4
39.9

WARNING: All open belt drives must be adequately guarded for personal safety during operation.