Four-phase stepper motor 39BH34-040A-JS16

hybrid stepperDC14V

Product Overview
The 39BH34-040A-JS16 is a compact NEMA 16 (39 mm) 4-phase hybrid stepper motor with an integrated JS16 planetary gearbox (1:10). It delivers 0.226 N·m holding torque at 0.4 A/phase. The integrated gearbox increases output torque and reduces speed for precise positioning in compact automation, medical devices and small robotics.

Key Highlights

• NEMA 16 (39 mm) stepper motor with integrated JS16 planetary gearbox
• 1:10 gearbox reduction for high torque in a compact form factor
• Holding torque: 0.226 N·m (2.3 kg·cm)
• 4-phase, 1.8° step angle (200 steps/rev)
• Rated current: 0.4 A/phase, rated voltage: 14 VDC
• UL1007 AWG26# lead wires, 750 mm length

Overview (specification table)
Frame size — 39 mm (NEMA 16)
Body length — 34 mm (motor only)
Total length — ≤ 78 mm (with gearbox)
Step angle — 1.8° ± 5%
Holding torque — 0.226 N·m (2.3 kg·cm)
Rated current — 0.4 A/phase
Rated voltage — 14 VDC
Gearbox ratio — 1:10 (JS16)

Motor Specifications (detailed)
Number of phases — 4
Step angle — 1.8° ± 5%
Holding torque — 0.226 N·m (2.3 kg·cm)
Rated voltage — 14 VDC
Rated current — 0.4 A/phase
Phase resistance (20°C) — 31 Ω ± 10%
Phase inductance (1 kHz) — 40 mH ± 20%
Insulation resistance — ≥ 100 MΩ (500 VDC)
Insulation class — Class B (130°C)
Ambient temperature — -20°C to +50°C
Ambient humidity — 15% to 95%
Motor weight — approx. 0.18 kg
Frame size — 39 mm (NEMA 16)
Body length — 34 mm
Shaft diameter — φ5 mm
Wire lead — 4-wire, 750±20 mm
Wire spec — UL1007 AWG26#

Planetary Gearbox (JS16)
Gearbox model — JS16
Reduction ratio — 1:10
Output shaft diameter — φ6 mm
Flange size — 42.2 mm Max
Pilot diameter — φ35 ± 0.2 mm
Mounting holes — 4 × φ4.5 ± 0.12 mm, 31 ± 0.1 mm spacing

Mechanical Drawing
Mechanical drawing available for 39BH34 Series (39 mm NEMA 16, JS16 planetary gearbox).

Technical characteristics / specifications

• Model / Series: 39BH34 (39BH Series)
• Frame size: 39 mm (NEMA 16)
• Motor body length: 34 mm (motor only)
• Total length (with gearbox): up to 78 mm
• Number of phases: 4
• Step angle: 1.8° ± 5% (200 steps/rev)
• Holding torque: 0.226 N·m (2.3 kg·cm)
• Rated current: 0.4 A/phase
• Rated voltage: 14 VDC
• Phase resistance (20°C): 31 Ω ± 10%
• Phase inductance (1 kHz): 40 mH ± 20%
• Insulation resistance: ≥ 100 MΩ (500 VDC)
• Insulation class: Class B (130°C)
• Ambient temperature: -20°C to +50°C
• Ambient humidity: 15% to 95%
• Motor weight: approx. 0.18 kg
• Shaft diameter (motor): φ5 mm
• Gearbox model: JS16 (1:10 reduction)
• Gearbox output shaft diameter: φ6 mm
• Gearbox flange max: 42.2 mm
• Pilot diameter: φ35 ± 0.2 mm
• Mounting holes: 4 × φ4.5 ± 0.12 mm, 31 ± 0.1 mm spacing
• Wire lead: 4-wire, 750±20 mm (UL1007 AWG26#)