SG92R Servo Motor: Complete Technical Specifications and Performance Parameters

01Core Technical Specifications (Summary Table)

| Parameter | Value | Condition / Note |

|-----------|-------|------------------|

| Operating Voltage | 4.8V – 6.0V DC | Nominal range; 5.0V recommended |

| Stall Torque | 2.5 kg·cm (34.7 oz·in) @ 4.8V

3.0 kg·cm (41.6 oz·in) @ 6.0V | Measured at output arm |

| Operating Speed | 0.12 sec/60° @ 4.8V

0.10 sec/60° @ 6.0V | No load |

| Rotation Angle | 180° ± 10° | Adjustable via pulse width |

| Pulse Control Range | 500 – 2500 µs | 1500 µs = neutral (90°) |

| Dead Band Width | 5 µs | Typical |

| Frequency | 50 Hz (20 ms period) | Standard PWM signal |

| Gear Type | Plastic (nylon/ABS composite) | All gears |

| Bearing Type | Plastic bushing (no ball bearing) | Single output shaft bushing |

| Dimensions (L×W×H) | 23.0 × 12.2 × 29.0 mm | Including mounting tabs |

| Weight | 9.0 g ± 0.5 g | Excludingservohorns and screws |

| Wire Length | 250 mm (9.8 inches) | 3-conductor, 28 AWG |

| Connector | JR / Futaba universal (3-pin, 0.1" pitch) | Signal (yellow/white), Vcc (red), GND (black/brown) |

02Operating Voltage and Torque – Critical Matching Rule

The SG92R is designed forregulated DC supplies only. Never exceed 6.0V or go below 4.5V (stall risk below 4.8V).

Common case:A hobbyist building a small robotic arm uses a 5V USB power bank with a 7805 regulator. At 5.0V, theservoprovides ~2.7 kg·cm – sufficient for lifting a 200g weight at a 3 cm arm length. However, when they tried a 6V NiMH battery pack (fully charged 7.2V), the servo overheated and stripped its plastic gears within 10 minutes. Always use a proper voltage regulator (e.g., LM2596 or 7806) for 6V operation.

Actionable advice:Before connecting, measure your supply voltage under load. For torque-critical tasks (e.g., steering a 1:18 scale RC car), calculate required torque = (load weight in kg) × (arm length in cm) × safety factor of 1.5. If result exceeds 3.0 kg·cm, choose a larger servo.

03Speed vs. Load – Real-World Performance

The unloaded speed (0.10–0.12 sec/60°) drops significantly with load. At 50% of stall torque (1.25–1.5 kg·cm), the speed reduces to approximately 0.25 sec/60°.

Example:A drone bomb bay door mechanism uses a 2 cm long horn. The door weight is 50g. Torque needed = 0.05 kg × 2 cm = 0.1 kg·cm – far below rating. Here the servo achieves near-rated speed. But in a model bulldozer blade with 400g resistance at 3 cm (1.2 kg·cm), the speed slows to ~0.3 sec/60°, causing jerky movement. Solution: Use two servos in sync or upgrade to a metal-gear model.

04Physical Dimensions – Fitment Verification

The exact case size (23×12.2×29 mm) includes two side mounting tabs with 3 mm diameter holes, spaced 32 mm center-to-center. Height includes the output shaft spline (20T, 4.8 mm diameter, compatible with standard Futaba/JR micro horns).

Common mistake:Users assume all “9g servos” are identical. A popular SG90 clone measures 22.5×12×28 mm – slightly smaller. When replacing an existing servo in a 3D-printed mount designed for SG90, the SG92R’s 0.5 mm extra length may cause interference. Always measure your cavity before purchase.

Actionable advice:Download a 1:1 CAD model (available on GrabCAD) and test fit in your assembly. For tight spaces, remove the mounting tabs (use a hobby knife, but note that voids the mechanical integrity).

05Control Signal – Exact PWM Specification

The SG92R expects a 50 Hz PWM signal (20 ms period). Pulse width defines angle:

500 µs → 0° (extreme left)

1500 µs → 90° (center)

2500 µs → 180° (extreme right)

Dead band is 5 µs, meaning changes smaller than 5 µs will not move the output shaft. This ensures jitter-free holding but limits ultra-fine positioning.

Case:An Arduino beginner sends 1 ms to 2 ms pulses (standard for many servos) and wonders why the SG92R only turns 120°. They did not adjust to 0.5–2.5 ms. After modifying code tomap(angle, 0, 180, 500, 2500), full 180° range is achieved.

For advanced users:You can extend rotation beyond 180° by sending pulses below 500 µs or above 2500 µs, but mechanical stops inside the gearbox limit to about 210°. Exceeding 3000 µs may damage the potentiometer.

06Common Use Cases and Selection Criteria

The SG92R excels in three scenarios:

Small educational robots(line followers, biped walkers under 300g total weight)

RC aircraft control surfaces(micro foam gliders, ailerons on wingspans

Pan-tilt mechanisms for sensors(cameras under 30g)

What it cannot do:Continuous rotation (unless modified), high shock loads (plastic gears crack in crash landings), outdoor wet conditions (no waterproofing), or long endurance runs (motor life ~500 hours at 20% duty cycle).

Real failure case:A hobbyist used four SG92R servos in a 2kg battle robot’s weapon lift. All failed within two matches. Post-mortem showed torque exceeded 4 kg·cm at impact. The correct choice would be a 20g metal-gear servo (e.g., standard size).

07Actionable Conclusion – How to Verify and Apply These Parameters

Core points to remember:

1. Operating voltagemustbe between 4.8V and 6.0V. Use a regulated supply.

2. Torque at 6.0V is 3.0 kg·cm – do not exceed this.

3. Control pulse range is500–2500 µs, not the common 1000–2000 µs.

4. Physical dimensions are 23×12.2×29 mm – verify your mount before ordering.

Immediate steps for your project:

Step 1:Calculate your maximum required torque (load × arm length × 1.5 safety factor). If > 3.0 kg·cm, do not use SG92R.

Step 2:Measure your available supply voltage under load. If >6.0V,add a 5V/6V regulator (e.g., LM1117-5.0).

Step 3:Generate a 50 Hz PWM signal with 500–2500 µs range from your microcontroller.

Step 4:Test with a single servo and a protractor to confirm full 180° travel.

Step 5:For production assemblies, buy from a reputable electronic component distributor (e.g., Mouser, DigiKey, RS Components) to avoid counterfeit units that show 20% lower torque.

Final recommendation:The SG92R is a reliable choice for lightweight, low-torque applications when all above parameters are strictly followed. For any project requiring more than 3.0 kg·cm torque, metal gears, or continuous rotation, select a different servo model. Always keep a spare – plastic gear servos are consumable items under heavy use.