Rated force
- Typical Range
- Micro to high-force roller-screw classes
- Why It Matters
- Hand, finger, and linkage axes are often force-limited before they are torque-limited.
Linear actuator and roller-screw motion options for humanoid robot hands, fingers, compact linkages, test fixtures, and high-force packaging cases where rotary modules are not the best fit.
Reference visual for selection context. Confirm controlled drawings, CAD path, and test records for shortlisted models.
Engineering Asset Status
Current site images are reference selection visuals for catalog navigation. They should not be treated as final factory photos, CAD drawings, test records, or lot-specific inspection documents. For shortlisted models, request the controlled packet tied to model code, drawing revision, test condition, and sample lot.
Reference visuals, product-family routes, RFQ class matrices, and validation checklists for early selection.
Controlled datasheet, drawing or CAD path, torque-speed or thermal record, wiring notes, and sample or OQC evidence.
Verified factory-floor photos, teardown images, and lot-specific test reports are not presented as public evidence until real project assets exist.
| Metric | Typical Range | Why It Matters |
|---|---|---|
| Rated force | Micro to high-force roller-screw classes | Hand, finger, and linkage axes are often force-limited before they are torque-limited. |
| Stroke and package ratio | Mechanism dependent | A linear actuator must fit both extended and retracted states inside the robot mechanism. |
| Axial stiffness | Screw and guide dependent | Compliance, backlash, and side load can dominate end-effector feel and repeatability. |
Use these representative classes as shortlist anchors. Final quoted samples depend on confirmed drawings, torque-speed duty cycle, thermal assumptions, protocol, brake, encoder, and validation requirements.
Micro linear finger actuator class
Compact linear actuator
Finger, thumb, small linkage, lab end-effector
40-120 N force
180-300 N short duration
5-30 mm stroke class
Micro package / linkage dependent
12-24 V DC
Position feedback or limit sensing
Mechanism review before sample selection
Stroke, side load, backlash, noise, heat, and end-stop behavior.
Compact roller-screw actuator class
Roller-screw linear actuator
High-force linkage, test fixture, compact humanoid axis
0.8-2.5 kN force
3-5 kN short duration
20-100 mm stroke class
OD 32-50 mm / package length by stroke
24-48 V DC
Encoder or linear feedback option
Load case and fixture review required
Force at speed, axial stiffness, side load, lubrication, and life-cycle duty.
| Class | Form / Joint Fit | Output Window | Interface Assumptions | Sample Gate |
|---|---|---|---|---|
HRA-LA16-FINGER Micro linear finger actuator class <50 Nm class | Compact linear actuator Finger, thumb, small linkage, lab end-effector | 40-120 N force 180-300 N short duration 5-30 mm stroke class | Micro package / linkage dependent 12-24 V DC Position feedback or limit sensing | Mechanism review before sample selection: Stroke, side load, backlash, noise, heat, and end-stop behavior. |
HRA-LA32-ROLLER Compact roller-screw actuator class 50-150 Nm class | Roller-screw linear actuator High-force linkage, test fixture, compact humanoid axis | 0.8-2.5 kN force 3-5 kN short duration 20-100 mm stroke class | OD 32-50 mm / package length by stroke 24-48 V DC Encoder or linear feedback option | Load case and fixture review required: Force at speed, axial stiffness, side load, lubrication, and life-cycle duty. |
Evidence Before Sample PO
This product family should be evaluated with practical evidence before a first sample PO. The goal is to confirm fit, duty, control interface, validation target, and repeatability without pretending that every controlled drawing or test record is a public download.
Approve linear actuator samples when force, stroke, duty cycle, end support, and side-load assumptions are clear.
Pause if the inquiry only gives force while stroke, speed, cycle rate, and mechanical guidance are unknown.
| Gate | Buyer Input | Supplier Evidence | Hold Signal | No-Go Signal |
|---|---|---|---|---|
| 01. Fit baseline | Joint position, robot class, available OD / length / bore, mounting interface, cable exit, and first quantity. | Candidate model family, envelope drawing, accessory boundary, and whether a standard model or OEM interface is required. | At least one model path can be mapped to the mechanical envelope without inventing unconfirmed dimensions. | The inquiry only says "humanoid actuator" or "high torque motor" without joint, envelope, or quantity context. |
| 02. Duty and thermal check | Continuous output, peak output, peak duration, speed or stroke, cycle profile, current limit, and ambient assumption. | Rated versus peak boundary, torque-speed or force-stroke explanation, temperature-rise note, and current-limit assumption. | Selection is based on continuous duty and validation cycle, not peak output alone. | The sample decision depends on a peak rating while repeated gait, lift, grip, or force-control cycles are undefined. |
| 03. Interface and control check | Voltage bus, protocol, controller location, encoder, brake, pinout, cable length, and firmware integration boundary. | Wiring / protocol note, controller compatibility, brake / encoder assumption, and connector or harness options. | Electrical and control interfaces are clear enough for a bench test without late adapter redesign. | Mechanical fit is accepted but protocol, feedback, brake, or harness integration is still ambiguous. |
| 04. Sample validation check | The specific pass / fail test for the first sample: backlash, thermal rise, noise, force response, impact, or stroke repeatability. | Focused inspection note, test record type, revision baseline, and which result should be checked by the buyer after receipt. | Both sides know what evidence will decide whether the sample can move toward pilot planning. | The sample PO is placed without a named acceptance check or revision trace. |
| 05. Pilot continuity check | Pilot quantity, repeat-order forecast, inspection expectation, packaging / shipping limits, Incoterm, and destination. | Repeat-lot change-control path, outgoing inspection scope, packaging baseline, and commercial delivery assumption. | The accepted sample can be repeated without silent model, drawing, accessory, or firmware drift. | The project treats a one-off sample as proof of supply readiness without defining repeat-order controls. |
Curves and Structure Evidence
Public pages can introduce the actuator family, but final sample approval should be based on the records behind the rating. Use this checklist to ask for performance envelopes, duty assumptions, and section-view evidence without treating unverified marketing numbers as engineering proof.
| Evidence | Buyer Question | Input to Provide | Supplier Record | Decision Signal |
|---|---|---|---|---|
| Torque-speed or force-speed envelope | Does the actuator stay inside the usable output window at the target joint speed, not only at stall or no-load speed? | Target continuous output, peak output, required speed or stroke rate, bus voltage, and controller current limit. | Torque-speed, force-speed, or model summary with rated and short-duration peak boundaries stated separately. | Move forward only when continuous output, peak duration, and speed are judged together for the sample duty. |
| Thermal rise and duty-cycle basis | Will repeated gait, lift, grip, or force-control cycles push the motor, reducer, driver, or housing into thermal saturation? | Cycle profile, ambient assumption, cooling path, enclosure condition, duty ratio, and allowable surface or winding temperature. | Temperature-rise note, duty-cycle assumption, thermal path explanation, or sample test record tied to the selected class. | Treat peak torque claims as incomplete until the repeated-duty thermal boundary is clear. |
| Overload duration and recovery limit | How long can the module tolerate impact, squat recovery, step correction, or grasp overload before derating is required? | Expected overload multiple, duration, frequency, robot mass or payload, and pass / fail recovery behavior. | Peak duration note, overload inspection basis, brake behavior, bearing support comment, or derating boundary. | Use this as a hold gate for hip, knee, ankle, and force-control samples where impact or overload is material. |
| Control response and feedback loop basis | Can the motor, encoder, driver, brake, and protocol support the intended torque, position, or impedance-control behavior? | Control mode, update rate expectation, protocol, encoder requirement, current limit, brake behavior, and bench-test setup. | Controller compatibility note, encoder and brake assumption, wiring / protocol record, or matched kit recommendation. | Do not separate mechanical sample approval from control-stack compatibility. |
| Evidence | Inspect For | Input to Provide | Supplier Record | Boundary |
|---|---|---|---|---|
| Envelope drawing and CAD revision | OD, ID, axial length, flange, mounting bolt circle, output plane, cable exit, connector sweep, and assembly clearance. | Robot joint envelope, CAD revision, mounting constraint, cable direction, and any forbidden volume. | 2D envelope, controlled CAD path, drawing revision note, and interface boundary for the candidate class. | Public pages can show selection context; precise CAD should stay controlled until the model and project stage are clear. |
| Internal stack or section-view review | Motor, reducer, encoder, brake, bearing support, hollow routing, sealing surface, and structural heat path. | Target joint, load path, shock expectation, harness route, brake need, and feedback architecture. | Exploded-view reference, section-view note, component boundary, or engineering review comment for the selected sample path. | Use this to identify integration risks without implying that every supplier drawing can be published openly. |
| Backlash, stiffness, and bearing support basis | Reducer type, output bearing support, moment-load path, backlash target, compliance behavior, and repeatability risk. | Joint position, expected moment load, precision need, force-control target, and test that will decide sample acceptance. | Backlash record, stiffness note, bearing support statement, or application-specific inspection scope. | Especially important for leg modules, hollow-shaft modules, and compact arm joints where package size hides mechanical risk. |
| Harness, connector, and serviceability path | Cable bend radius, connector orientation, pinout, strain relief, service loop, and whether the joint can be assembled repeatedly. | Cable bundle, connector preference, controller location, service access limit, and repeat-order accessory expectation. | Wiring / protocol note, pinout baseline, harness option, accessory revision, or OEM interface recommendation. | A sample that fits mechanically can still fail the project if harness and connector assumptions are late. |
Treat this page as the selection context for datasheets, drawings, CAD access, wiring notes, and sample records. Controlled files should be requested with a candidate model, integration stage, and revision baseline.
| Packet | Best Timing | Documents | Input to Include | Boundary |
|---|---|---|---|---|
| Public selection packet | Early shortlist | Datasheet, model summary, basic envelope image, and application fit notes. | Target joint, output window, voltage / protocol assumption, and quantity direction. | Used for selection only; it is not a controlled drawing or final project guarantee. |
| RFQ-qualified engineering packet | Before sample quote | 2D envelope, interface notes, wiring / protocol note, accessory list, and sample gate. | Drawing revision, mechanical envelope, controller stack, and validation priority. | Provided after the model path is clear; it may still exclude editable CAD or supplier-controlled internals. |
| NDA-controlled CAD packet | Before mechanical freeze | STEP / CAD path, pinout details, revision-controlled drawings, and customization notes. | Confirmed candidate model, buyer entity, project scope, and NDA path if needed. | Not an automatic website download; controlled files depend on model, OEM scope, and permission. |
| Sample validation packet | Before pilot decision | Inspection note, focused test result, revision record, and packing / shipment baseline. | Accepted sample scope, test fixture context, pass / fail priority, and pilot quantity. | Generic records may not answer the application risk; request the exact test that matters. |
Yes, when the axis needs force, stroke, or packaging behavior that is better served by a roller screw or compact electric cylinder than a rotary joint.
Procurement guide
Use the procurement guide when this product family is entering comparison, RFQ, or sample review. It translates page-level claims into torque-speed, interface, evidence, and supplier-readiness questions.
A buyer-side guide for pre-modular humanoid actuator sourcing: selection risk, evidence requests, sample readiness, and pilot supply controls.
Next sourcing step
01 Catalog shortlist
After a product family is shortlisted, validate the joint load case, sample gate, and evidence boundary before custom files or pilot timing enter the discussion.
Inquiry Email
Subject: RFQ Inquiry - Humanoid Linear Actuators
This inquiry started from a product family page. Keep the request anchored to model-family fit, interface assumptions, and sample evidence. Source context: Humanoid Linear Actuators.
Instant Chat
+8618857971991
Best for quick model-fit questions before a full RFQ email.