--- title: "Leaderdrive LHS series strain-wave reducer specs" description: "Leaderdrive LHS hat-type strain-wave reducer family with keyed, coupled, supported hollow-input and input-shaft integration options." canonical: https://actuatorlist.com/actuators/leaderdrive-lhs last-updated: 2026-11-01T14:05:43.000Z --- # LHS series (Harmonic Drive strain-wave reducer) by Leaderdrive (Suzhou Leader Harmonic Drive) > Leaderdrive LHS hat-type strain-wave reducer family with keyed, coupled, supported hollow-input and input-shaft integration options. ## Specifications | Spec | Value | | --- | --- | | Category | Harmonic / Precision | | Peak torque | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Rated torque | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Max speed | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Gear ratio | 50:1-160:1: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Weight | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Torque density | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Price | quote only: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Price per Nm | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Backdrivable | Legacy catalog placeholder; not a measured family rating. See engineering notes. | | Backlash | Legacy catalog placeholder; not a measured family rating. See engineering notes. | | Voltage | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Peak current | n/a: Family-level catalog value; confirm frame, ratio and variant. Reducer/sensor assembly, not an integrated motor and drive. | | Communication | n/a | | Control modes | n/a | | Encoder | Legacy catalog placeholder; not a measured family rating. See engineering notes. | | Integrated driver | no | | Availability | in production | | Data status | Family-level evidence: confirm variant | ## Use cases - robot arm - industrial robot joint - cobot joint ## Engineering notes Family-level evidence reviewed October 1, 2026. Manufacturer-published data is not independent bench validation. Examples below are not selected inventory SKUs; existing catalog fields are not replaced with family ranges. ### Manufacturer specifications LHS has a hat-type, hollow-flanged construction. Variants include keyed I, cross-slider II, supported hollow-input III and supported input-shaft IV; III-ST and CL-III change packaging. A reducer input shaft is not an integrated electric motor. LHSG is separate. [Leaderdrive LHS, Models](https://www.leaderdrive.com/product/4.html). ### Conditions and revision conflicts At frame 20, ratio 100, the [website](https://www.leaderdrive.com/product/4.html) lists rated 40 Nm, start-stop 82 Nm, average 49 Nm, peak 147 Nm and maximum input 6,500 rpm. The [LHS-I manual, PDF page 2 in ZIP](https://www.leaderdrive.com/uploadfile/file/20250725/1753424129693371.zip) lists 38 Nm at 2,000 rpm, start-stop 78 Nm, average 47 Nm, momentary 140 Nm and maximum input 6,000 rpm. Confirm applicable revision. Website starting/backdriving values are variant-specific: III is 32 cN·m / 38 Nm; IV is 9.9 cN·m / 12 Nm. Do not collapse them into a universal family value. ### Engineering inference The [LHS geometry archive](https://www.leaderdrive.com/uploadfile/file/20250728/1753689892719593.zip) contains STEP files. Routing, enclosure and input details require the actual variant drawing; CAD does not establish calibrated simulation support. Inference assumes the selected drawing and applicable revision are confirmed. Confidence in model completeness is low; no numerical efficiency, cooldown or precision estimate is defensible from this evidence. ### Unknown / confirmation required Numerical product-specific efficiency, cooling hardware, repeated thermal duty/derating, externally measured loaded output repeatability and calibrated simulation support remain unconfirmed in the reviewed material. Unknown is not zero. Encoder or sensor resolution is not output accuracy. Motor voltage, current and motor constants are not applicable to a reducer alone; select a motor/drive separately. Use the [robot actuator selection guide](/guides/robot-actuator-selection) to define the missing measurements and acceptance criteria. ## Sources - [https://www.leaderdrive.com/product/4.html](https://www.leaderdrive.com/product/4.html) - [https://www.leaderdrive.com/uploadfile/file/20250725/1753424129693371.zip](https://www.leaderdrive.com/uploadfile/file/20250725/1753424129693371.zip) - [https://www.leaderdrive.com/uploadfile/file/20250728/1753689892719593.zip](https://www.leaderdrive.com/uploadfile/file/20250728/1753689892719593.zip) - [https://www.gigager.net/showroom/leaderdrive-lhs-i-series-harmonic-drive-speed-reducer-for-high-precision.html](https://www.gigager.net/showroom/leaderdrive-lhs-i-series-harmonic-drive-speed-reducer-for-high-precision.html) - [https://www.made-in-china.com/showroom/leaderdriveharmonic/product-detailVKinUBxDhXkI/China-Leaderdrive-Lhs-I-Series-Harmonic-Drive-Speed-Reducer-for-High-Precision.html](https://www.made-in-china.com/showroom/leaderdriveharmonic/product-detailVKinUBxDhXkI/China-Leaderdrive-Lhs-I-Series-Harmonic-Drive-Speed-Reducer-for-High-Precision.html) - [https://www.directindustry.com/prod/leader-harmonious-drive-systems-co-ltd/product-245080-2757791.html](https://www.directindustry.com/prod/leader-harmonious-drive-systems-co-ltd/product-245080-2757791.html) ## Similar Harmonic / Precision actuators - [EC-A5013-H17-100 (ENCOS)](https://actuatorlist.com/actuators/encos-ec-a5013-h17-100): 142.9 Nm/kg - [EC-A3814-H14-107 (ENCOS)](https://actuatorlist.com/actuators/encos-ec-a3814-h14-107): 138.2 Nm/kg - [LPA-20 (Low Profile Rotary Actuator) (Harmonic Drive LLC)](https://actuatorlist.com/actuators/harmonic-drive-lpa-20): 40.7 Nm/kg - [FHA-14C-100 (FHA-C Mini) (Harmonic Drive LLC)](https://actuatorlist.com/actuators/harmonic-drive-fha-14c-100): 17 Nm/kg - [SHA-CG series (SHA-CG Hollow Shaft Actuator) (Harmonic Drive LLC)](https://actuatorlist.com/actuators/harmonic-drive-sha-cg): n/a ## Machine-readable - JSON: https://actuatorlist.com/api/v1/actuators/leaderdrive-lhs - Catalog index for agents: https://actuatorlist.com/llms.txt