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This high-precision planetary gearbox is belong to MG series gearbox, it with gear ratio 5:1 and a maximum 30arc-min backlash. Diffent with the EG series' steel gears, MG series' gears are made of powder metallurgy. It's an excellent choice for applications that require good accuracy but low cost.

This inline planetary gearbox built-in an input shaft coupling which can match standard 5mm short shaft Nema 17 stepper motor, brushless dc motor and brushed dc motor.

One of matchable motor is 17HS15-1584S, for other motors, EGase contact our technical support to custom the motor shaft.

MG series gearboxes are only suitable for short shaft motors with a shaft length of 6.5-10.5mm. The suitable bracket is ST-M12.

Gearbox Specifications(MG17-G5)

Manufacturer Part Number: MG17-G5

Gearbox Type: Planetary

Gear Ratio: 5:1

Efficiency: 90%

Rotor Inertia: 0.03kg·m²

Backlash at No-load: <=30arcmin

Max.Permissible Torque: 9Nm(79.66lb-in)

Noise: <=55dB(1000rpm)/65dB(3000rpm)

Waterproof Rating: IP54

Lifetime: 20000hours

Physical Specifications

Frame Size: 42 x 42mm

Gearbox Length: 40mm

Output Shaft Type: Key way

Output Shaft Diameter: Φ8mm

Output Shaft Length: 21.5mm

Input Shaft Diameter: Φ5mm

Input Shaft Length: 6.5-10.5mm;

Gearbox Specifications(MG17-G10)

Manufacturer Part Number: MG17-G10

Gearbox Type: Planetary

Gear Ratio: 10: 1

Efficiency: 90%

Rotor Inertia: 0.03kg·m²

Backlash at No-load: <=30arcmin

Max.Permissible Torque: 5Nm(44.25lb-in)

Noise: <=55dB(1000rpm)/65dB(3000rpm)

Waterproof Rating: IP54

Lifetime: 20000hours

Physical Specifications:

Frame Size: 42 x 42mm

Gearbox Length: 40mm

Output Shaft Type: Key way

Output Shaft Diameter: Φ8mm

Output Shaft Length: 21.5mm

Input Shaft Diameter: Φ5mm

Input Shaft Length: 6.5-10.5mm;

Gearbox Specifications(MG17-G20)

Manufacturer Part Number: MG17-G20

Gearbox Type: Planetary

Gear Ratio: 20:1

Efficiency: 90%

Rotor Inertia: 0.03kg·m²

Backlash at No-load: <=50arcmin

Max.Permissible Torque: 10Nm(88.51lb-in)

Noise: <=55dB(1000rpm)/65dB(3000rpm)

Waterproof Rating: IP54

Lifetime: 20000hours;

Physical Specifications;

Frame Size: 42 x 42mm

Gearbox Length: 51mm

Output Shaft Type: Key way

Output Shaft Diameter: Φ8mm

Output Shaft Length: 21.5mm

Input Shaft Diameter: Φ5mm

Input Shaft Length: 6.5-10.5mm;

Gearbox Specifications(MG17-G50)

Manufacturer Part Number: MG17-G50

Gearbox Type: Planetary

Gear Ratio: 50:1

Efficiency: 90%

Rotor Inertia: 0.03kg·m²

Backlash at No-load: <=50arcmin

Max.Permissible Torque: 10Nm(88.51lb-in)

Noise: <=55dB(1000rpm)/65dB(3000rpm)

Waterproof Rating: IP54

Lifetime: 20000hours

Physical Specifications:

Frame Size: 42 x 42mm

Gearbox Length: 51mm

Output Shaft Type: Key way

Output Shaft Diameter: Φ8mm

Output Shaft Length: 21.5mm

Input Shaft Diameter: Φ5mm

Input Shaft Length: 6.5-10.5mm;

Gearbox Specifications:(MG17-G100)

Manufacturer Part Number: MG17-G100

Gearbox Type: Planetary

Gear Ratio: 100:1

Efficiency: 90%

Rotor Inertia: 0.03kg·m²

Backlash at No-load: <=50arcmin

Max.Permissible Torque: 5Nm(44.25lb-in)

Noise: <=55dB(1000rpm)/65dB(3000rpm)

Waterproof Rating: IP54

Lifetime: 20000hours;

Physical Specifications:

Frame Size: 42 x 42mm

Gearbox Length: 51mm

Output Shaft Type: Key way

Output Shaft Diameter: Φ8mm

Output Shaft Length: 21.5mm

Input Shaft Diameter: Φ5mm

Input Shaft Length: 6.5-10.5mm

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The main markets of oyostepperuk ebay store are Europe and the UK, and it is affiliated with OYOSTEPPER. Founded in 2010, OYOSTEPPER is a trusted online supplier specializing in high-quality electric motors at competitive prices. With over a decade of experience, we proudly serve customers worldwide, offering fast shipping, responsive service, and reliable products.

Our product range includes stepper motors, servo motors, BLDC motors, and AC gear motors — available in various sizes, phases, and step angles to suit a wide range of applications. Whether you're a small business, an engineer, a hobbyist, or a DIY enthusiast, we’re here to help you find the right motor solutions quickly and affordably.

At OYOSTEPPER, we understand the challenges of sourcing custom or small-quantity motors directly from factories. That’s why we aim to bridge the gap — making it easier than ever to access specialized and customized motors without large minimum orders.

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