• Changzhou Vic-Tech Motor Technology Co., Ltd.
    Andres Blanco
    The thruster have arrived correctly. I tested them on the ROV and we are very happy with the result. The epoxy interior finish is very good and the power of the motors in relation to the size is quite good.
  • Changzhou Vic-Tech Motor Technology Co., Ltd.
    Gregoire Lange
    The cooperation between Changzhou Vic-Tech Motor Tech and our company was just great. Good understanding of our needs, great willing to solve our problems. I recommend !
  • Changzhou Vic-Tech Motor Technology Co., Ltd.
    David Molevelt
    Professional and clear communication. Order was shipped in time. Counter connectors where added to the shipment. Driver works like we agreed !
  • Changzhou Vic-Tech Motor Technology Co., Ltd.
    Buildstorm Private Limited
    The product works as expected, it was packed nicely. Seller responds very quickly and helps in making a buying decision. They are ready to customize the product for you.
  • Changzhou Vic-Tech Motor Technology Co., Ltd.
    Ashley Griffin
    Shipment was received very quickly. Product was well protected by packaging. Company rep was cordial and kind. A Plus rating!
Contact Person : Kangtai Lee
Phone Number : +86 17715451401
Whatsapp : +8617715451401

15mm Worm Gear Stepper Motor With Worm Gearbox Gear Ratio Selectable

Place of Origin China
Brand Name VIC-TECH
Certification RoHS
Model Number SM15-818G
Minimum Order Quantity 1Unit
Price $3.2-$8/unit
Packaging Details The product is packed with pearl cotton, and the outside is in a carton.
Delivery Time 10~30 days after receiving sample payment
Payment Terms MoneyGram, Western Union,Credit Card,T/T, L/C
Supply Ability 100000\ Units/year

Contact me for free samples and coupons.

Whatsapp:0086 18588475571

Wechat: 0086 18588475571

Skype: sales10@aixton.com

If you have any concern, we provide 24-hour online help.

Product Details
Motor Type 15mm Worm Gear Stepper Motor Gear Type Spur Gear
Gearbox Structure The First Stage Is Worm Gear, The Back Spur Gear Step Angle 18 Degree
No. Of Phases 2 Phases Lead Screw Type D-axis
Minimum Order Quantity 1unit
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15mm Worm Gear Stepper Motor


Worm Gearbox 15mm Stepper Motor


ODM Gear Stepper Motor

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Product Description


This is a 15 mm stepper motor with a worm gearbox. There are 1 and 2 heads of worm gear, which can be understood as 1 and 2 teeth. The number of heads is selected according to the gear ratio, and the efficiency of worm gear is relatively low at 22%-27%.

Customers can choose according to their choice of gearbox gear ratio.
In addition to these gear ratios, customers can also customize the speed ratio as needed, which is generally possible.

The larger the transmission ratio, the slower the output shaft rotation and the higher the torque.
Output shaft torque=motor torque*reduction ratio*gearbox efficiency
15mm motor torque is usually at 15g.cm
With a gearbox with 118:1 gear ratio
Gearbox efficiency is about 24%
The output torque is approx:15g*cm * 118 * 0.24 = 424 g*cm


Model No. SM15-818G
Motor diameter 15mm
Motor type Permanent magnet motor
Drive voltage 5V DC
Coil resistance 31Ω±10%/phase
Number of phase 2 phases
Step angle 18°
Gear ratio 21:1~1030:1


Design Drawing


About geared stepper motors

The gear box has high precision, high efficiency and low noise, which makes the product have good reliability.
The power input position of the stepper motor can be in the form of FPC, FFC, PCB cable, etc.
The output shaft of the motor can adopt various output structures, such as circular shaft, D-shaft and wire bar.

About worm gearboxes

N20 DC motor + worm gear box

1. worm gearboxes are inefficient (less than 30%) and will have lower output torque than other types of gearboxes.
2. Worm gearboxes have a self-locking function, which will automatically lock when the motor is powered off.
3. It can also be used with 15mm dual stepper motors, N20 motors, 10mm stepper motors and 20mm stepper motors, which customers can choose according to their needs.

As shown in the figure below:
15mm double stepper motor + worm gearbox


10mm stepper motor + worm gear box


20mm stepper motor + worm gear box


Worm Gearbox Parameters


Gear ratio 21:1 42:1 118:1 236:1 302:1 399:1 515:1 603:1 798:1 1030:1
Precise ratio 21.00 42.00 118.067 236.133 301.726 398.976 515.200 603.452 797.853 1030.400
Worm gear starts No. 2 1 2 1 2 2 2 1 1 1
Gear levels 3 3 4 4 5 5 5 5 5 5
Efficiency 27% 27% 24% 24% 22% 22% 22% 22% 22% 22%



Geared stepper motors, widely used in Smart home, personal care, home appliance equipment, smart medical equipment, smart robot, smart logistics, smart cars, communication equipment, smart wearable devices, consumer electronics, camera equipment, and other industries.


Lead Time and Packaging Information

Lead time for samples:
Standard motors in stock: within 3 days
Standard motors not in stock: within 15 days
Customized products: About 25~30 days (based on complexity of customization)

Lead time for building a new mold: generally about 45 days

Lead time for mass production: based on order quantity

Samples are packed in foam sponge with a paper box, shipped by express
Mass production, motors are packed in corrugated cartons with transparent film outside. (shipping by air)
If shipped by sea, product will be packed on pallets


Shipping Method

On samples and air shipping, we use Fedex/TNT/UPS/DHL. (5~12 days for express service)
For sea shipping, we use our shipping agent, and ship from Shanghai port. (45~70 days for sea shipping)


1.Are you a manufacturer?
Yes, we are a manufacture, and we produces mainly stepper motors.

2.Where is your factory location? Can we visit your factory?
Our factory is located in Changzhou, Jiangsu. Yes, you are very welcome to visit us.

3.Can you provide free samples?
No, we don’t provide free samples. Customers won’t treat free samples fairly.

4.Who pays for shipping cost? Can I use my shipping account?
Customers pay for shipping cost. We will quote you shipping cost.
If you think you have cheaper/more convenient shipping method, we can use you shipping account.

5.What’s you MOQ? Can I order one motor?
We don’t have MOQ, and you can order only one piece sample.
But we recommend you to order a little bit more, just in case the motor is damaged during your testing, and you can have a back-up.

6.We are developing a new project, do you provide customization service? Can we sign a NDA contract?
We have over 20 years of experience in stepper motor industry.
We have developed many projects, we can provide full set customization from design drawing to production.
We are confident we can give you few advice/suggestions for your stepper motor project.
If you are worrying about confidential issues, yes, we can sign a NDA contract.

7.Do you sell drivers? Do you produce them?
Yes, we do sell drivers. They are only suitable for temporary sample test, not suitable for mass production.
We do not produce drivers, we only produce stepper motors