M21NRXB-JNF-NS-00 Pacific Scientific
Wake Industrial LLC is not an authorized distributor of this product.
No Tariffs On US Orders- Straightforward Pricing: No Rush Fees, No Credit Card Fees
The Pacific Scientific M21NRXB-JNF-NS-00 is a step motor from the POWERMAX II M Motors series with a NEMA 23 frame size and an enhanced construction type. It features a step angle of 1.8 degrees with 200 steps per revolution and supports a single flat shaft with a diameter of 6.35 mm. The motor weighs 0.68 kg, uses Class B insulation rated for 130°C, and has an operating temperature range of -20°C to +40°C.
To contact sales for pricing and lead time:
Payment Methods
Shipping Methods
Our Credentials
Product Description:
The M21NRXB-JNF-NS-00 is a two-phase POWERMAX II M stepper motor manufactured by Pacific Scientific. It fits NEMA 23 frames and is intended for indexers, pick-and-place heads, and other positioning axes that need consistent incremental motion. With one internal magnetic stack and a low-inertia rotor, the motor translates command pulses into precise shaft increments. This design supports straightforward open-loop control in compact automation platforms that do not require onboard feedback.
The motor follows NEMA mounting conventions, with an across-flats dimension of 57.10 mm and an overall body length of 52.3 mm for installation in standard 57 mm frames. A single 6.35 mm shaft projects 20.60 mm beyond the front face and has a ground flat for secure coupling. The single-stack magnetic circuit helps minimize detent torque. Each full step covers 1.8 degrees, dividing a complete rotation into 200 equal increments. Positional deviation remains within ± 1.5%, meeting common accuracy requirements for light robotics and compact positioning equipment. Two stator phases driven with bipolar current energize the B-type windings. Motion commands enter through a standard lead-wire connection terminated in a receptacle, and the motor does not include a feedback device. Its enhanced construction improves stiffness under dynamic loads.
The motor has a mass of 0.68 kg and a winding-to-ambient thermal resistance of 5.5 °C/W. The winding system uses Class B insulation rated for 130 °C, providing suitable thermal protection during continuous operation. Its insulation resistance is 100 megohms, while the dielectric system withstands 340 VDC. Continuous operation is permitted from -20 °C to +40 °C, allowing the motor to function across common industrial ambient temperatures. Cabinet airflow is generally sufficient to remove operating heat without auxiliary cooling. The low-inertia rotor helps dynamic loads settle quickly after acceleration or deceleration, while the NEMA mounting face supports direct installation in compatible machine frames.
Frequently Asked Questions about M21NRXB-JNF-NS-00:
Q: What is the frame size of the M21NRXB-JNF-NS-00 motor?
A: This model features a NEMA 23 frame size, which is a common size used in motion control applications.
Q: What is the shaft diameter and configuration on this motor?
A: The shaft has a diameter of 6.35 mm and is a single flat shaft with an extension of 20.60 mm.
Q: What is the step angle and number of steps per revolution for this unit?
A: The M21NRXB-JNF-NS-00 operates with a standard step angle of 1.8 degrees per step, providing 200 steps per revolution.
Q: What insulation class is used in the M21NRXB-JNF-NS-00?
A: This model is specified with insulation class B, rated up to 130°C for safe operation.
Q: What is the allowable operating temperature range for this product?
A: The operating temperature range is between -20°C and +40°C for this Pacific Scientific motor.
