Specification Overview
The document provides specifications for a series of DC gear motors, specifically model D202A1 with a size of 20mm. The motors are suitable for applications such as storage boxes, advertising equipment, audio equipment, and electronic game machines. Complementary products include customized shafts, additional lead wires for motors, and specially designed motors.

Gearbox Specifications
The gearbox is available in configurations with 3 to 7 stages, offering various gear ratios ranging from 10 to 488.3. The length of the gearbox varies from 16.0 mm to 20.5 mm depending on the number of stages.

Motor Specifications
The document lists several models with different voltage requirements, no-load speeds, and maximum efficiency parameters. Key specifications include:

• D202-002010: 12V, 1300 rpm no-load speed, 1000 rpm at maximum efficiency, 0.15 kg.cm torque, 350 mA current, 1500 mW output.
• D202-004025: 6V, 270 rpm no-load speed, 200 rpm at maximum efficiency, 0.35 kg.cm torque, 450 mA current, 750 mW output.
• D202-004062: 12V, 140 rpm no-load speed, 100 rpm at maximum efficiency, 0.4 kg.cm torque, 200 mA current, 410 mW output.
• D202-010156: 6V, 65 rpm no-load speed, 50 rpm at maximum efficiency, 1.0 kg.cm torque, 400 mA current, 500 mW output.
• D202-012195: 6V, 36 rpm no-load speed, 28 rpm at maximum efficiency, 1.2 kg.cm torque, 200 mA current, 370 mW output.
• D202-040312: 4.8V, 24 rpm no-load speed, 16 rpm at maximum efficiency, 4.0 kg.cm torque, 670 mA current, 650 mW output.
• D202-030488: 6V, 15 rpm no-load speed, 12 rpm at maximum efficiency, 3.0 kg.cm torque, 290 mA current, 370 mW output.

Mechanical Dimensions
The document includes a picture illustrating the mechanical dimensions of the DC gear motor, although specific measurements are not detailed in the text.