Cup-type standard harmonic reducer; the official table covers unit builds FSS-I/II and the FSS-C component set at shared size-and-ratio ratings
Motion & Actuation · Strain-wave gear unit
FSS series, size 20, ratio 100
The official FSS page publishes a series-size-ratio specification grid with per-build weights but no single orderable purchase code, so this record freezes the grid coordinates size 20, ratio 100. Rated torque is explicitly defined at 2,000 r/min input. Substitution for or interchangeability with any other manufacturer’s strain-wave product is not established by this record.
Laifual FSS-20 ratio 100 harmonic reducer · Also: FSS-20-100, FSS size 20 ratio 100 (build types FSS-I/II, FSS-C)
What this record can support today.
Coverage is computed from published, non-unknown fields. It measures the record—not product quality—and makes missing procurement evidence explicit.
Engineering field coverage64%
7 of 11 selected fields published
- Official product sourcepublished
- Lifecycle statepublished
- Mechanical dimensions / mass / mountingpublished
- Environmental operating limitsmissing
- Continuous or rated outputpublished
- Peak / momentary outputpublished
- Speed boundarypublished
- Transmission ratio / errorpublished
- Electrical input / consumptionmissing
- Control and communication interfacemissing
- Position / torque feedbackmissing
Procurement field coverage15%
2 of 13 selected fields published
- Official product / sales routepublished
- Lifecycle statepublished
- Exact orderable SKU / part numbermissing
- Price with region, currency and quantitymissing
- Lead time with check datemissing
- Commercial availability / stock statemissing
- Minimum order quantitymissing
- Authorized distributor / sales channelmissing
- CAD / STEP / interface drawingmissing
- Certification with identifiermissing
- MTBF / failure / reliability datamissing
- Warranty termsmissing
- PCN / EOL / replacement noticemissing
Coverage measures whether a selected public field is present with non-U evidence. It is not a product score, compatibility result, certification, availability confirmation or procurement recommendation. Download the complete readiness coverage JSON →
Reported values, conditions attached.
Evidence state describes the claim—not the prestige of the company or document.
| Claim | Reported value | Condition / boundary | State | Source |
|---|---|---|---|---|
| Series grid coordinatesseries_grid_configuration | FSS series, size 20, ratio 100; table weights cover FSS-I/II, FSS-C, FSN-I/II and FSSF-I builds | The cited page defines a size-and-ratio specification grid; it does not publish one complete orderable code. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Rated torque at 2,000 r/min inputrated_torque | 40 N·m | Exact column label "Rated torque at 2000r/min input"; size-20 ratio-100 row. The table also states 4.1 kgf·m. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Permissible peak torque at start and stopstart_stop_peak_torque | 82 N·m | Size-20 ratio-100 row; a start/stop event boundary, not a continuous operating point. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Permissible maximum value for average load torquemax_average_load_torque | 49 N·m | Size-20 ratio-100 row; a load-spectrum boundary. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Permissible maximum momentary torquemax_momentary_torque | 147 N·m | Size-20 ratio-100 row; an emergency-event boundary with its own occurrence conditions. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Permissible maximum input rotational speedmax_input_speed | 6,500 r/min | Size-20 table value; the column is qualified for grease lubrication. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Permissible average input rotational speedaverage_input_speed | 3,500 r/min | Size-20 table value; the column is qualified for grease lubrication. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Backlashbacklash | ≤20 Arc Sec | Size-20 table value with the manufacturer’s exact unit notation; a component specification, not a mounted-joint measurement. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Weight by build typeweight | FSS-I/II: 0.96; FSS-C: 0.28; FSN-I/II: 0.73; FSSF-I: 0.96 kg | Size-20 table cell listing per-build weights; the FSS-C component set excludes the unit housing and bearing structure of the I/II builds. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Design lifedesign_life | 15,000 Hour | Size-20 ratio-100 row; the ratio-50 row of the same size states 10,000 hours, so the value is ratio-specific. Life definition and load conditions are not detailed on the cited page. | M · Manufacturer claimed | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Torsional stiffness, transmission accuracy and hysteresis valuesstiffness_accuracy_surface | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.The cited official FSS page does not publish torsional-stiffness, transmission-accuracy or hysteresis figures for the size-20 ratio-100 grid position. | U · Unknown | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Robot-joint thermal duty enveloperobot_joint_thermal_envelope | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.The cited page does not define one universal robot-joint motor, housing, lubrication, cooling, ambient and motion-cycle envelope for this record. | U · Unknown | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
| Independent exact-gear robot validationindependent_robot_validation | Not published in cited public evidence | RCI checked the cited official public evidence on the verification date.RCI has not received, instrumented, endurance-tested or teardown-inspected this harmonic reducer in a robot joint. | U · Unknown | Laifual Drive FSS Standard Harmonic Reducer ↗FSS series specification table: size-20 ratio-100 row for ratings, input speeds, backlash, weight and design life · Live official product page observed 2026-08-19 Checked 2026-08-19 |
Known limits
What this record does not prove.
- The cited official page publishes a series-size-ratio grid without one orderable purchase code; an exact order code and lubrication specification must be fixed with Laifual before procurement.
- Substitution for or interchangeability with Harmonic Drive or any other manufacturer’s strain-wave product is not established by this record.
- The 15,000-hour design life is a manufacturer statement whose test definition and load conditions are not published on the cited page.
- No RCI physical specimen, joint integration, life test or teardown evidence exists.