XY-SR620HFN002 is an NSK Megaposiitioner SR series ultra-high-torque rotary positioning unit (SR620H body), FN002 precision positioning spec — absolute accuracy 40 arc-sec, repeatability ±5 arc-sec. The SR series integrates a Megatorque direct-drive motor with a non-backlash reducer: high rotational rigidity for fast positioning of high-inertia loads (allowable load inertia 700 kg·m², allowable moment load 2 770 N·m), with a large-bore hollow output shaft and axial runout of 10 µm or less.
Direct drive + zero backlash: conventional servo + reducer setups suffer backlash and wear, degrading accuracy over time. The SR's non-backlash reduction mechanism directly coupled to the Megatorque motor keeps accuracy stable for life, closed-loop controlled by a 62 914 560 divisions/rev position sensor. Ideal for large rotary tables, heavy-duty index tables, and panel/semiconductor transfer.
Key specs: max output torque 1,960 N·m (rated 520 N·m), max speed 0.21 s⁻¹, reduction ratio 24, allowable axial load 32,700 N, allowable radial load 28,900 N, mass 240 kg. Driven by a dedicated EDC driver unit with built-in controller (suffix E01 = standard, C01 = CC-Link). See the attached official catalog for dimensions and allowable-load diagrams.
Same-series part numbers: XY-SR4500FN001, XY-SR4500FN002, XY-SR620HFN001.
Sizing & Integration Support
Direct-drive motor sizing involves the inertia ratio (load inertia / rotor inertia) and the motion profile against the speed–torque curve. Add your load conditions (inertia, motion angle, cycle time, mounting orientation) to the inquiry cart — the Nahshon engineering team will help you select the right model and confirm specs, quotation and delivery with NSK.
