Zhejiang Laifual Drive Co., Ltd
Zhejiang Laifual Drive Co., Ltd
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LHT High Precision Harmonic Gearbox

The LHT Series of hollow output shaft gearboxes use hat type flex spline. We can divide the LHT drive actuators into 5 versions, LHT-I, LHT-II, LHT-III, LHT-IV and LHT-V.

Differences Among Different LHT harmonic reducers:

  • LHT-I: use uni-body type wave generator

  • LHT-II: cross slider type wave generator

  • LHT-III: large bore with a hollow hole

  • LHT-IV: shaft input type

  • LHT-V: Simple type

Specification of LHT Series Large Diameter Hollow Hole, Flat Shape Harmonic Gearbox


Rated parameter table of LHT series hollow shaft gearboxes

ModelReduction ratioRated torque at 2000r/min inputPermissible peak torque at start and stopPermissible maximum value for average load torquePermissible maximum momentary torquePermissible maximum input rotational speed(Grease)Permissible average input rotational speed
BacklashDesign life
NmkgfmNmkgfmNmkgfmNmkgfmr/minr/minArc SecHour

Features of Harmonic Shaft Gearboxes

  • Large bore with hollow hole, flat shape

  • Non-backlash

  • High positioning and rotational accuracies

  • Coaxial input and output

  • Compact and simple design

  • High torque capacity

  • High stiffness

  • Light weight

Drawing Download ofLHT Series Large Diameter Hollow Hole, Flat Shape Harmonic Gearbox

LHT Series


Description of LHT Standard Harmonic Gearbox

LHT-I/II Series Harmonic Drive Gearbox

  • The wave generator adopts an integrated structure, which makes the whole product structure more compact.

  • Two connection ways:Circular spline is fixed while flexspline as an outputs. Or flexspline is fixed while circular spline as an outputs

  • Motor can be connected with the gearbox directly. It is easy for installation.

LHT-III Series Harmonic Gearbox

  • There is a large-diameter hollow shaft hole in the middle of the wave generator cam

  • There are support bearings inside the harmonic gearbox. The harmonic reducer is designed with fully sealed structure. It is easy for installation

  • It is suitable for situation where the wire needs to be threaded from the center of the harmonic gearbox

LHT-IV Series Harmonic Drive

  • The wave generator cam comes with input shaft. It is suitable for different input forms.

  • There are support bearings inside the strain wave gear. The harmonic gearbox is designed with fully sealed structure. It is easy for installation

  • It is suitable for situation where bevel gears or timing belt drive need to be installed at the input end

LHT-V Series Strain Wave Gear

  • Based on LHT-III series harmonic drive gearbox, users can redesign freely for lower weight and thinner thickness while properties have no change.

  • 1
    Can you supply products with large quantity?

    Yes, we can. Our annual production ability is more than 200,000pcs.

  • 2
    Do You Have Professional Technology Team?

    Yes, we have more than 70 employees on the technical team. We can offer a professional technical solutions for customers' projects.

  • 3
    What's the General Delivery Time?

    For standard product, the delivery time normally around 2-3 weeks. For customized products, normally aound 1-2 months.

  • 4
    Do You Produce The Harmonic Gearbox By Yourself?

    Yes, we are top harmonic gearbox manuafacturer in China, the total factory is 30,000 square meters with over 400 employees, Laifual's R&D center is recognized as a "High-tech enterprise R&D center in China".

  • 5
    What's The Biggest Advantage Of Your Products?

    Our product series is very complete, and the quality of the products is stable. The most important is the highest cost-effective in China.

  • 6
    What is your terms of payment ?

    For order amount which is less than 1000USD, 100% in advance; more than 1000USD, 30% T/T in advance, balance before shippment.

  • 7
    What is your product warranty?

    1 year warranty after delivery or working time of 2000 hours on condition that it is used in normal assembly state and lubrication condition recorded in product content.

  • 8
    How about after sales service?

    Our sales team are online 24 hours a day to help you solve any problems.

  • 9
    Can You Offer OEM & ODM Services?

    Yes, we can offer OEM and ODM services according to customers requirements.


We can ship to virtually any address in the world.

We will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on your chosen shipping provider, shipping date estimates may appear on the shipping quotes page. Please also note that the shipping rates for many items we sell are weight-based. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Products in Stock:

Shipping within 24 hours.

Customize Products:

Shipping within 3-5 weeks after both parties confirm the drawings.


Warranty period:

The warranty period is the earlier time between 1 year after delivery or working time of 2000 hours on condition that it is used in normal assembly state and lubrication condition recorded in product content.

Warranty Scope:

As a harmonic drive company, Laifual Drive is responsible for the maintenance or replacement of the product when malfunction resulting from a manufacturing defect under the warranty period. However, the following situations are out of warranty scope.

  • Damage results from the unsuitable operation or illegal use by clients.

  • Damage results from modification or repair that is not carried out by our company.

  • Damage not caused by the product.

  • Damage results from natural disasters and the like but not the responsibility of our company.

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