20mm diameter high precision linear stepper motor with M3 lead screw brass slider 1.2KG thrust

Short Description:

Model No.  SM20-35L-T
Motor type  linear stepper motor with slider
Driving voltage  12V DC
Step angle  18°/STEP
No. of phases  2 phases (bipolar)
Lead screw type  M3*0.5P
Coil resistance  20Ω±10% ohm/phase(20℃)
Minimum order quantity  1unit

Product Detail

Product Tags


This is a 20mm diameter permanent magnet stepper motor with brass slider.
The brass slider is made from CNC and it has double linear bearing to provide strong support.
The thrust of the slider is 1~1.2 KG(10~12N), and the thrust is related to motor’s lead screw’s pitch, driving voltage and driving frequency.
A M3*0.5mm pitch lead screw is used on this motor.
When driving voltage gets higher, and driving frequency gets lower, slider’s torque will be bigger.
Motor’s stroke (travel distance) is 35 mm, we also have 21mm and 63mm stroke for options, if customers want shorter size.
The motor’s connector is P1.25mm pitch, 4 pins connector. We can customize and change it into other connector type if customers require other pitch connectors.


Model No. SM20-35L-T
Driving voltage 12V DC
Coil resistance 20Ω±10%/phase
No. of phase 2 phases (bipolar)
Step angle 18°/step
Thrust 1~1.2 KG
Stroke 35mm
Lead screw M3*0.5P
Step length 0.025mm
Excitation method 2-2 phase excitation
Drive mode Bipolar drive
Insulation class Class e for coils
Operating temperature range -0~+55℃

Custom Type Reference Example


Design Drawing


About linear stepper motors

A linear stepper motor has lead screw to convert the rotation movement into linear movement. Stepper motors with lead screw can be considered as linear stepper motor.
A slider linear stepper motor contains a bracket, slider, and supporting rods are added, based on the external drive linear motor’s design. Because supporting rods provide anti-rotation mechanism for the slider, slider can only do linear movement.
The lead screw’s lead equals to its pitch, and when motor rotates one turn slider moves exactly one pitch of distance.
For example, if motor’s step angle is 18°, it means it takes 20 steps to rotate one turn. If the lead screw is M3*0.5P, pitch is 0.5mm, slider moves 0.5mm for each revolution.
Motor's step length is 0.5/20=0.025mm. This means when the motor takes one step, the linear movement of the screw/slider is 0.025mm. For motors with the same diameter and torque, the longer step length it has, fast linear speed it will have, but smaller thrust will have at the same time.

Linear stepper motor type



Motor’s speed is determined by driving frequency, and it has nothing to do with load (unless it’s losing steps).
Due to high precision speed control of stepper motors, with a driver controlled stepping you can achieve very precise positioning and speed control. For this reason, stepper motors are the motor of choice for many precision motion control applications.
For linear stepper motors, they are widely used in:
Medical device
Camera equipment
Valve control system
Test instrument
3D printing
CNC machine
and so on


Customization service

Motor’s design can be adjusted based on customer’s requirement including:
Motor’s diameter: we have 6mm, 8mm, 10mm, 15mm and 20 mm diameter motor
Coil resistance/ rated voltage: coil resistance is adjustable, and with higher resistance, motor’s rated voltage is higher.
Bracket design/ lead screw length: if customer want the bracket to be longer/short, with special design such as mounting holes, it’s adjustable.
PCB + cables + connector: PCB’s design, cable length and connector pitch are all adjustable, they can be replaced into FPC if customers require.

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

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