Nidec FLEXWAVE WPU-50-100-SRH Hollow-Shaft Strain-Wave Unit
FLEXWAVE high-torque type B2 open hollow-shaft unit, size 50 (HD size-20 class), 100:1; also offered as Smart-FLEXWAVE with built-in torque/temperature sensor (BD code).
Specifications
| Ratio | 100:1 |
|---|---|
| Rated torque | 52 N·m |
| Peak torque (repeated / momentary) | 107 N·m maximum output / 191 N·m emergency stop |
| Backlash | zero backlash (maker claim) |
| Outer diameter | 95 mm (φSE h7, largest diameter); φLD h7 = 90 mm on the other end |
| Hollow shaft | yes (SRH = hollow shaft unit) |
| Length | 51.5 mm (dimension LE, overall axial) |
| Mass | 1400 g (1.4 kg) |
| Hollow bore | 21 mm (φSC H7, hollow shaft bore) |
Who makes it
Need a different shaft, connector, firmware or enclosure, or a price at 1,000 units? Maglev takes the catalog part to the factory and comes back with a custom version and one fixed price.
Landed cost in the US
Total US duty on this part by where it is made (2026-10-29). Mexico shown before USMCA preference; qualifying goods enter duty free. Your factory choice, not the shipping port, sets the origin.
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Compliance
| HTS classification | 8483.40.50.10 |
|---|---|
| NDAA | unknown |
| Blue UAS | unknown |
| FCC | n/a |
| Notes | FLEXWAVE sizes are named by outer size (50 ≈ Harmonic Drive size 20, 63 ≈ size 25). Leaflet nominal input speed 3,000 rpm; torque table values match HD CSG/SHG. |
Equivalents from other makers
Sources
- https://www.nidec.com/files/user/www-nidec-com/nidec-drivetechnology/product/download/catalogs_pdf/PowerTransmission_WP/NDTC-FLEXWAVE_WPseries_leaflet_en_41781.pdfWP leaflet: series lineup (WPU-SRH), B2 spec table size 50 ratio 100, SRH dimension table
- https://www.nidec.com/files/user/www-nidec-com/nidec-drivetechnology/product/download/catalogs_pdf/PowerTransmission_WP/NDTC-FLEXWAVE_40930.pdfOuter diameter (researched 2026-11-03); Length (researched 2026-11-03); Mass (researched 2026-11-03); Hollow bore (researched 2026-11-03)
Record confidence: VERIFIED. VERIFIED means the maker's own documents; REPORTED means a credible third party; UNVERIFIED means a single weak source. Anything we could not confirm says unknown.