Gear ratio L 19:1 22 mm [0.87 in] 30:1 22 mm [0.87 in] 50:1 24 mm [0.94 in] 70:1 24 mm [0.94 in] 100:1 26.5 mm [1.04 in] 131:1 26.5 mm [1.04 in] 5.0 0.20 34.8 1.37 36.8 1.45 6×M3 7.0 0.28 22.0 0.87 30.7 1.21 L 15.5 0.61 31.0 1.22 0.5 0.02 5.4 0.21 6.0 0.24 22.5 0.89 2.9 0.11 12.0 0.47 1.6 0.06 6.5 0.26 https://www.pololu.com/category/116/37d-mm-gearmotors Name: 37D mm Metal Gearmotors (without encoders) Drawing date: 18 January 2016 1. To get the specified scale, select 100% in print settings. Units: Scale: 1:1 7.8 0.31 mm [in] Material: mix Pololu Robotics & Electronics © 2016 Pololu Corporation Gear ratio L 19:1 22 mm [0.87 in] 30:1 22 mm [0.87 in] 50:1 24 mm [0.94 in] 70:1 24 mm [0.94 in] 100:1 26.5 mm [1.04 in] 131:1 26.5 mm [1.04 in] 15.4 0.61 34.8 1.37 22.0 0.87 36.8 1.45 6×M3 7.0 0.28 L 30.7 1.21 15.5 0.61 5.4 0.21 31.0 1.22 6.0 0.24 12.0 0.47 34.0 1.34 6.5 0.26 https://www.pololu.com/category/116/37d-mm-gearmotors Name: 37D mm Metal Gearmotors (with encoders) Drawing date: 18 January 2016 1. To get the specified scale, select 100% in print settings. Units: Scale: 1:1 mm [in] Material: mix Pololu Robotics & Electronics © 2016 Pololu Corporation