NEMA 8 | 20mm Stepper Motor Lead Screw Linear Actuator - Stepper Motor Lead Screw Linear Actuator

NEMA 8 | 20mm Stepper Motor Lead Screw Linear Actuator

NEMA 8 (20mm) linear stepper motors are available in three configurations: captive, non-captive and external linear.

They are characterized by small size, high performance, long-lasting resistance, low noise and high efficiency. The nut is made of engineering plastic, self-lubricating and maintenance free.

Widely used in medical equipment, semiconductor processing, valve control, X-Y table, hand-held instruments or anywhere precise linear motion is required.

Multiple motor lengths, multiple screw guides, and multiple screw strokes are available for customer selection.

- Motor size 20mm, body lengths 30mm and 38mm.

- Optional drives, encoders, brakes and controllers

Specifications

21mm Size 8 Linear Stepper Motor(1.8° Step Angle)
Part No.	Captive	21CA4(X)-V
	Non- captive	21NA4(X)-V
	External Lin.	21EA4(X)-V
Wiring		Bipolar
Rated voltage		2.5V	5V	7.5V
Rated current		0.49A	0.24A	0.16A
Resistance/phase		5.1Ω	20.4Ω	45.9Ω
Inductance/phase		1.0mH	3.88mH	11.7mH
Power consumption		2.45W
Temperature rise		75°C
Weight		43g
Insulation resistance		20MΩ

Standard motors are Class B rated for maximum temperature of 130℃. Unipolar drive gives approximately 30% less thrust than bipolar drive.

Leadscrew Thread Dimension

Screw diameter	Step(mm)	Step(in)	Lead(mm)	Lead(in)	Code
φ3.5mm (9/64in)	0.001524	0.00006	0.3048	0.012	U
	0.003048	0.00012	0.6096	0.024	N
	0.006096	0.00024	1.2192	0.048	K
	0.012192	0.00048	2.4384	0.096	J
	0.005	0.00020	1	0.039	AB
	0.01	0.00039	2	0.079	AC
	0.02	0.00079	4	0.157	AD
	0.04	0.00157	8	0.315	AE