# Worm gear motor, 5840-31ZY, 12RPM, 12V

- Page: https://sigmanortec.ro/en/worm-gear-motor-5840-31zy-12rpm-12v
- Price: 129.06 RON
- Availability: Out of stock
- Reference: 88088 · EAN: 5947596948802
- Category: Mechatronics and IoT > Motors > DC and Gear Motors
- Specifications: Input Voltage: 12 V; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Package (shipping data): 0.371 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:52 (Europe/Bucharest)

## Description

DC motor with worm gear for applications requiring high torque and self-locking, ideal in mechanisms, automation or robots where the position must be maintained without power. It operates at 12V, delivers 12 RPM in no-load and approx. 70 kg/cm torque, has a high reduction ratio for increased force, 8 mm shaft for secure coupling and robust construction.
The DC 5840-31ZY motor is a worm gear motor designed for applications that require high torque at low speed and stable positioning without power. The 670:1 reduction ratio transforms the rotor’s high speed into a slow, powerful motion, with 12 RPM no-load and approximately 9 RPM under load, and a maximum torque of 70 kg/cm. The worm-and-wheel construction provides a self-locking function, meaning the shaft cannot be turned externally when the motor is not powered, an important advantage for barriers, shutters, lifting mechanisms, robotic arms, turntables, and any mechanism that must keep its position in the absence of current.
The metal housing, the 8mm diameter shaft with a usable length of 15.5mm, and the total height of 114mm make it suitable for mounting in real mechanical structures, while the 350g weight keeps the assembly compact. Power supply is 12VDC, no-load current is only 0.3A, and stall current reaches 6.5A, a value that must be taken into account when sizing the power supply and driver.
The direction of rotation is reversed by swapping the supply polarity, and speed can be adjusted via PWM at low frequencies.
Attention:
The gear in contact with the worm gear is made of bronze. Continuous use at maximum load leads to premature wear of the gear. The indicated specifications are maximum values, not continuous operating values. The bronze gear is the wear part of the assembly and is designed to fail first, protecting the motor and the steel worm. Its wear resulting from operation at high load, in continuous duty or with shocks and repeated direction reversals does not constitute a manufacturing defect and is not covered by the warranty.
Maximum specifications (peak values, short-duty operation):
Type: Turbo 5840-31ZY
Power supply: 12VDC
Reduction ratio: 670
Speed: 12 RPM no-load
Consumption: 0.3A no-load
Speed (under load): 9 RPM
Consumption (stall): 6.5A
Torque: 70 KG/cm
Shaft length: 15.5mm
Shaft diameter: 8mm
Motor height: 114mm
Weight: 350g
Recommended operating specifications:
Continuous working torque: max 20 KG/cm
Continuous operating current: max 2A
Operating mode: intermittent, duty cycle max 30 percent
Recommended cycle: 10 minutes running followed by 20 minutes break
Maximum housing temperature: 60 degrees C
Direction reversal: only after the shaft has completely stopped
Dimensions: