42P 42 mm Planetary Gearbox - Technical Datasheet v1.1¶
Status: Public engineering evaluation reference
Release date: 2026-10-08
The SigGear 42P is a 42 mm planetary gearbox platform with one- to four-stage configurations. Performance values below are consolidated from the current canonical product page. Mechanical-interface details are linked to the controlled 2D drawing reference released for this model.
Key Specifications¶
| Parameter | Public value |
|---|---|
| Nominal outer diameter | 42 mm |
| Number of stages | 1-4 |
| Gearbox length range | 35.6–69.5 mm |
| Reduction ratio range | 3.8:1–660.7:1 |
| Rated allowable torque range | 80.0–150.0 kgf·cm |
| Maximum momentary torque range | 160.0–300.0 kgf·cm |
| Efficiency range | 66–90% |
| Backlash at no load | ≤ 1.2° |
| Continuous permissible input speed | ≤ 8,000 rpm |
| Operating temperature range | −40 to 120 °C |
| Housing material | Steel |
| Gear material | Steel |
| Output bearing | Ball bearings |
Maximum momentary torque is not a continuous working rating.
Stage, Ratio and Performance¶
| Stages | Gearbox body length L | Available ratios | Rated allowable torque | Maximum momentary torque | Efficiency |
|---|---|---|---|---|---|
| 1 | 35.6 mm | 3.8 / 4.3 / 5.1 | 80.0 kgf·cm | 160.0 kgf·cm | 90% |
| 2 | 46.9 mm | 14.4 / 16.3 / 18.6 / 19.2 / 21.8 / 25.7 | 100.0 kgf·cm | 200.0 kgf·cm | 80% |
| 3 | 58.2 mm | 54.4 / 61.9 / 70.4 / 72.8 / 80.1 / 82.8 / 94.2 / 97.4 / 110.8 / 130.3 | 120.0 kgf·cm | 240.0 kgf·cm | 73% |
| 4 | 69.5 mm | 206.4 / 234.6 / 266.8 / 276 / 303.5 / 313.9 / 345 / 357 / 369.2 / 406 / 419.9 / 477.5 / 493.93 / 561.70 / 660.7 | 150.0 kgf·cm | 300.0 kgf·cm | 66% |
Published Load / Shaft Limits¶
| Parameter | Public value |
|---|---|
| Radial load, 10 mm from flange | ≤ 16.0 kgf |
| Shaft axial load | ≤ 8.0 kgf |
| Radial play of shaft | ≤ 0.04 mm |
| Thrust play of shaft | ≤ 0.3 mm |
These values are taken from the current 42P specification sheet. Application suitability still depends on the actual load direction, duty cycle, stage / ratio, motor operating point and installation.
Motor Matching Reference¶
- Adapted DC motor nominal voltage: 3–48 VDC
- Adapted DC motor power: below 200 W
These are motor-matching conditions, not electrical ratings of the mechanical gearbox.
Mechanical Interface and CAD¶
View 42P Mechanical Interface v1.0
A simplified public 4-stage STEP reference is released for early packaging and mechanical Design-In. The detailed full-assembly STEP remains configuration-controlled and request-only because it contains internal planetary transmission geometry.
For final CAD, provide the selected ratio, stage count and motor interface.
Request CAD / Controlled Drawing
Selection Information Required¶
Please provide:
- Required output speed or reduction ratio
- Continuous and momentary output torque
- Motor voltage, power and speed
- Motor shaft diameter and length
- Motor mounting-hole pattern and locating pilot
- Output-shaft requirements
- Radial and axial loads
- Duty cycle and ambient temperature
- Backlash, noise and service-life targets
- Prototype and annual quantity
Related Product¶
Engineering Contact¶
Wanrong Wang
International Sales / Sales Engineer, SigGear
wangwanrong@siggear.com