Planetary gearbox · 42 mm
PG42 planetary gearbox, backlash down to 3 arcmin.
Our most-requested frame for AGV wheel drives and robotic joints. Hardened steel gears, one-piece planet carrier, and direct mounting to NEMA 17 and 23 motors.
Key specifications
Frame size42 mm
Ratios3.6:1 – 100:1
Stages1 / 2 / 3
Backlash≤ 7 / ≤ 3 arcmin
Rated torque15 N·m
Max torque30 N·m
Efficiency96% (1-stage)
Motor mountNEMA 17 / 23
Specifications
Ratings by stage and ratio.
| Stage | Ratio range | Rated torque (N·m) | Max torque (N·m) | Backlash (arcmin) | Efficiency |
|---|---|---|---|---|---|
| 1 | 3.6–10 | 15 | 30 | ≤ 7 / 3 | 96% |
| 2 | 15–40 | 15 | 30 | ≤ 10 / 5 | 92% |
| 3 | 50–100 | 10 | 20 | ≤ 12 / 7 | 89% |
Solid, keyed and hollow output shafts available; custom flanges machined to order.
Applications
Where the PG42 is specified.
AGV / AMR
Compact wheel and steering drives.
Robotics
Joint drives needing ≤ 3 arcmin.
Medical
Silent, clean actuation.
Packaging
High-cycle indexing mechanisms.
FAQ
Common questions.
What is the difference between the standard and precision PG42?
The standard PG42 has ≤ 7 arcmin backlash. The precision class uses a hardened helical final stage and preloaded carrier for ≤ 3 arcmin, suited to robotics joints and servo-like positioning.
Which motors mount to the PG42?
The PG42 mounts directly to NEMA 17 and NEMA 23 stepper motors, and can be adapted to brushless DC and servo motors with a custom input flange.
How do I choose the right ratio?
Divide your required output speed into the motor's rated speed, then check the resulting output torque stays within the gearbox rating with a safety margin.
Can I get a hollow output shaft?
Yes. The PG42 is available with a solid, keyed or hollow output shaft, plus custom mounting flanges machined in-house.
What are the efficiency and service life?
Single-stage efficiency is about 96%. Rated service life is 20,000 hours at rated torque with standard lubrication.
Get a quote
Request pricing for the PG42.
Tell us your ratio, output torque and motor, and we'll quote a matched gearmotor assembly.