Step angle: 1.8° 
Temperature rise: below 80 ℃ 
Ambient temperature: -20 ℃ ~ + 50 ℃ 
Insulation resistance: minimum 100MΩ, 500VDC
Dielectric strength: 500VAC for 1 minute 
Shaft radial clearance： 0.02 max (450 g load) 
Shaft axial clearance: 0.08Max. (450 g load)
Maximum radial force: 28N (20mm from flange) 
Maximum axial force: 10N 
size: Approximately 42x42x40mm
 
Holding Torque: 4.2KG.CM; 
Current / Phase: 1.7A 
Step Angle(degrees): 1.8 Degree 
Model Number: NEMA17 
Phase:2 Type: Hybrid
Model: JK42HS40-1704-13A 
Motor length: 40mm 
Diameter of axle: 5mm
 
Resources:
1. Controlling NEMA 17 Stepper Motor with Arduino and A4988 Stepper Driver Module
2. Control Stepper Motor with A4988 Driver Module and Arduino
3. A4988 Stepper Motor Driver Module