K43HRHL-LDK-NS-00 Pacific Scientific
Wake Industrial LLC is not an authorized distributor of this product.
The Pacific Scientific K43HRHL-LDK-NS-00 is a stepper motor from the K PowerPac Motors series featuring SIGMAX enhanced construction and a heavy duty NEMA 42 frame with a 4.325 inch square dimension. It provides a holding torque of 39.9 Nm, supports a maximum axial load capacity of 405 pounds, and has a straight key double shaft design. The motor weighs 56.6 pounds, operates within a temperature range of -20°C to +40°C, and includes a 4 lead parallel connection style with no feedback option.
Internal Product Review
The K43HRHL-LDK-NS-00 is a Pacific Scientific stepper motor built on a NEMA 42 frame with SIGMAX enhanced construction. A 39.9 Nm holding torque and ±1.5% step accuracy support dependable positioning in demanding motion applications. Heavy-duty NEMA mounting adds installation strength, making the motor an excellent choice for industrial indexing systems.
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Product Description:
The K43HRHL-LDK-NS-00 is a stepper motor manufactured by Pacific Scientific for the K PowerPac Motors series. Designed for index positioning and speed control in automated machinery, it couples a laminated rotor with SIGMAX enhanced construction to raise flux density without increasing motor size. The unit occupies a 4.325-inch square NEMA 42 frame, uses a double straight-key shaft, and installs with heavy-duty NEMA mounts. Its four-lead parallel wiring allows connection to high-current bipolar drives, and the motor suits applications that need open-loop step control without encoder feedback.
Its holding torque reaches 39.9 Nm, allowing the shaft to resist large inertial loads between commanded moves. A full step advances the rotor by 1.8°, giving 200 mechanical steps per revolution for predictable incremental motion. The copper windings have a phase resistance of 0.500 ohms at 25 °C, allowing the drive electronics to estimate current draw and power loss. The phase inductance is 8.50 mH, which governs current rise time and affects the maximum attainable step rate. Positional repeatability remains within ±1.5%, supporting fixtures where accumulated error must remain low across long motion sequences.
The axial bearing system is rated for 405 lb, and the shaft can accept a radial load of up to 110 lb without reducing bearing life under rated operating conditions. The assembly has a total mass of 56.6 lb, which adds mechanical damping and helps suppress resonance in large gantries. Continuous operation is permitted at ambient temperatures from -20 °C to +40 °C, making the motor suitable for unconditioned factory environments. The motor has a body length of 201 mm, a rotor inertia of 0.229 oz-in-s², and a thermal resistance of 1.02 °C/W. Its insulation resistance is 100 MΩ at 340 V DC, and it is supplied without a shaft seal for direct coupling inside protected enclosures.
