15.9 Nm at 3000 min⁻¹ — the sizing numbers behind the motor
The R88MK5K030FBS2: The headline mechanical rating is 15.9 Nm of continuous torque at an output speed of 3000 min⁻¹, drawing 12 A — the figure set that defines which axis this motor can carry on a converted machine tool, an indexing table, or a packaging line. The combination matters: 15.9 Nm at 3000 min⁻¹ is mid-frame G5 territory, sized for moderate-inertia loads where the cycle needs repeatable torque delivery more than peak burst. Operating voltage spans 323 V to 528 V, the envelope that pairs with Omron's G5-series servo drives on a 400 V or 480 V three-phase bus. The window is wide enough to ride line-side variation without tripping the drive's undervoltage threshold, but the integrator still has to confirm the drive firmware is set for the same motor map — the motor's voltage class and the drive's motor parameter table have to match before commissioning.
268 × 130 × 130 mm frame — machine envelope reality
For a retrofit where an older servo is being swapped one-for-one, the 130 × 130 mm face pattern and 268 mm body length are the dimensions that decide whether the new motor drops into the existing bracket without a machine re-machining.