NEMA11 28mm linear hybrid stepper motor non-captive run through shaft

Short Description:

Model No.: SM28C0205.

Motor type: Hybrid stepper motor
Step angle: 1.8 degree/step
No. of phases 2 phases (Bipolar)
Lead screw type Tr4.77*P1.27*1N
Coil resistance 9.1Ω±10%
Rated voltage 4.55V DC
Rated current 0.5A/phase

Product Detail

Product Tags


This is NEMA11 (28mm size) hybrid stepper motor with 1.8° step angle.
No like regular shaft, this is a run-through stepper motor with lead screw in the middle.
The lead screw Model No. is: Tr4.77*P1.27*1N
The pitch of lead screw is 1.27mm, and it has single start, so lead is 1.27mm, as its pitch.
So the step length of the motor is: 1.27mm/200 steps=0.00635mm/step, step length means the linear movement, when the motor takes one step.

There is a manual nut at the bottom, it can be used for manual rotation, or assemble encoders.
We also have motors with other size, and other types of lead screws for option.


Model No. SM28C0205
Motor diameter 28mm (NEMA11)
Drive voltage 4.55V DC
Coil resistance 9.1Ω±10%/phase
Number of phase 2 phases (bipolar)
Step angle 1./step
Rate current 0.5A/phase
Minimum thrust (300PPS) 6KG
Step length 0.00635mm/step


Design Drawing


About lead screw

The lead screw used on linear hybrid stepper motor is in general trapezoidal lead screw.
For example for Tr3.5*P0.3*1N lead screw.
Tr means trapezoidal lead screw type
P0.3 means lead screw’s pitch is 0.3mm
1N means it’s single start lead screw.
Lead screw lead=start number*pitch
So for this specific lead screw, it’s 0.3mm lead.
Motor’s stepper angle of hybrid stepper motor is 1.8 degrees/step, which takes 200 steps to rotate one turn.
Step length is linear movement the motor makes, when it takes one single step.
For a 0.3mm lead screw, step length is 0.3mm/200 step=0.0015mm/step

Basic structure of NEMA stepper motors


Application of Hybrid stepper motor

Due to high resolution of hybrid stepper motor’s (200 or 400 steps per revolution), they are widely used for applications requiring high precision, such as:
3D printing
Industrial control(CNC, automatic milling machine, textile machinery)
Computer peripherals
Packing machine
And other automatic systems requiring high precision control.


Customers should follow the principle of “selecting stepper motors first, then select driver based on existing stepper motor”
It is best not to use the full-step driving mode to drive a hybrid stepping motor, and the vibration is bigger under full-step driving.
Hybrid stepper motor is more suitable for low-speed occasions. We suggest the speed does not exceed 1000 rpm (6666PPS at 0.9 degrees), preferably between 1000-3000PPS (0.9 degrees), and it can be attached with a gearbox to lower it’s speed. The motor has high working efficiency and low noise at suitable frequency.
Due to historical reasons, only the motor with a nominal 12V voltage uses 12V. Other rated voltage on design drawing is not exactly the most suitable driving voltage for the motor. Customers should choose suitable driving voltage and suitable driver based on own requirement.
When the motor is used with high speed or large load, it generally does not start at the working speed directly. We suggest to gradually increases the frequency and speed. For two reasons: First, the motor does not lose steps, and second, it can reduce noise and improve the positioning accuracy.
The motor should not work in the vibration area(below 600 PPS ). If it must be used at slow speed, vibration problem could be reduced by changing the voltage, current or adding some damping.
When the motor works below 600PPS (0.9 degrees), it should be driven by small current, large inductance and low voltage.
For loads with a large moment of inertia, a large size motor should be selected.
When higher precision is required, it could be solved by adding gearbox, increasing the motor speed, or using subdivision driving. Also a 5-phase motor(unipolar motor) could be used, but the price of the entire system is relatively expensive, so it’s rarely used.
Stepper motor size:
We currently have 20mm(NEMA8), 28mm(NEMA11), 35mm(NEMA14), 42mm(NEMA17), 57mm(NEMA23), 86mm(NEMA34) hybrid stepper motors. We suggest to determine motor size first, then confirm other parameter, when you select a hybrid stepper motor.

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

If we have samples in stock, we can ship out samples in 3 days.
If we do not have samples in stock, we need to produce them, production time is about 20 calendar days.
For mass production, lead time depends on order quantity.

Payment method and payment terms

For samples, in general we accept Paypal or alibaba.
For mass production, we accept T/T payment.
For samples, we collect full payment before production.
For mass production, we can accept 50% pre-payment before production, and collect the rest 50% payment before shipment.
After we cooperate order more than 6 times, we could negotiate other payment terms such as A/S (after sight)


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

8.What payment methods do you accept?
We can accept payment via Mastercard, Visa, e-Checking, PAYLATER, T/T and Paypal.

9.How long is the general delivery time for samples? How long is the delivery time for back-end large orders?
For samples in stock, lead time is within 3 days.
For samples not in stock, lead time is about 15 days.
For customized samples, lead time is about 25 to 30 days.

10. Do you provide technical support? How long is the product quality guarantee period?
We can provide you professional technical support and our products quality guarantee is 12 months.

11. What customization service do you provide?
We have a developing team for over 20 years experience.
We provide customization service on all sorts of motor’s components.
From motor’s slider, lead screw, gearboxes design.
To cable length, connector type, and FPC design.

12.How is the product packaged?
Samples are packed with foam sponge inside paper box.
For mass production, products are packed in paper carton.
For sea shipping (Mass production), cartons are packed on pallet.

Frequently Asked Question

1.The reasonable range of stepper motor heat generation:
The extent to which motor heat generation is allowed depends largely on the motor's internal insulation level. The internal insulation will only be destroyed at high temperatures (above 130 degrees). So as long as the internal does not exceed 130 degrees, the motor will not damage the ring, and the surface temperature will be below 90 degrees at that point. Therefore, the surface temperature of stepper motor in 70-80 degrees are normal. Simple temperature measurement method useful point thermometer, you can also roughly determine: with the hand can touch more than 1-2 seconds, not more than 60 degrees; with the hand can only touch, about 70-80 degrees; a few drops of water quickly vaporized, it is more than 90 degrees

2.Stepper motor heat brought about by the impact of:
Motor heating although generally does not affect the life of the motor, for most customers do not need to pay attention to. But seriously will bring some negative effects. Such as the different coefficients of thermal expansion of the internal parts of the motor leads to changes in structural stress and small changes in the internal air gap, will affect the dynamic response of the motor, high-speed will be easy to lose step. Another example is that some occasions do not allow the excessive heat of the motor, such as medical equipment and high-precision test equipment, etc.. Therefore, the heat generation of the motor should be controlled as necessary.

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