Schematic

0.9
0.04
20°20'
15.4
0.61
Gear ratio L
25:1, 31:1 16.0 mm [0.63 in]
63:1, 78:1 17.5 mm [0.69 in]
100:1, 125:1, 156:1, 195:1 19.0 mm [0.75 in]
250:1, 313:1, 391:1, 488:1 20.5 mm [0.81 in]
R
https://www.pololu.com/category/167/20d-mm-gearmotors
1.
20D mm Metal Gearmotors
Scale: 5:4
Name:
Units:
mm
3450-3497, 3700-3723
[in]
Material:
6 October 2017
Mixed
© 2017 Pololu Corporation
Item number:
Dev code:Drawing date:
To get the specified scale, select 100% in print settings.
—
0.79
20.0
0.30
7.5 7.5
0.30
2×M2.5
0.16
18.0
0.71
7.0
0.28
4.0
25.1
0.99
3.6
0.14
6.0
0.24 0.12
3.0 2.1
0.08
6.2
0.24
L
15.4
0.61
0.14
3.5
14.5
0.57
20.4
0.80
2.0
0.08
2.0
0.08
0.3
0.01