Package Included: 1Pcs Nema23 Stepper Motor Planetary Gearbox 50:1 1Pcs Key Gearbox SpecificationsGearbox Type: PlanetaryGear Ratio: 50:1Efficiency: 96%Backlash at No-load: ≤7 arcminMaximum radial force/torque:400NMaximum axial force/torque:300NNoise: ≤58dBWaterproof Rating: IP65Lifetime: 20000 hoursRated input speed:3000rpmMax. input speed:8000rpmWeight:1.4kg Physical Specifications Frame Size: 60 x 60 mmGearbox Length: 93mmOutput Shaft Type: Key wayOutput Shaft Diameter: Φ14 mmOutput Shaft Length: 31 mmInput Shaft Diameter: Φ8 mmInput Shaft Length: 21~24 mm 20 Chromium Manganese Titanium Alloy SteelHas high strength and toughnessGood impact resistance performance Needle and deep groove ball bearingsHigh bearing capacity, high accuracy, and long service life High temperature resistance & antioxidant This high-precision planetary gearbox has a 7 arc-min backlash. It's an excellent choice for applications that require good accuracy and reliability at an exceptional value.This inline planetary gearbox built-in an input shaft coupling which can match any standard 8mm diameter shaft of Nema 23 stepper motor. Planetary Reducer for Nema23 (Flange=57mm) Stepper Motor. Frame Size: 60 x 60 mm;Adapter motor: for 8mm Shaft Nema 23 Stepper Motor Backlash Precision: ≤ 7 Arcmin ; Full load efficiency: ≥ 96% ; Protection class: IP65 Maximum radial force/torque:400N;Maximum axial force/torque:300N Special grease, non-solidifying, long-lasting lubrication,lifespan is around 20000h High-precision gears, low noise, professional engineers design, high hardness, 20CrMnTi steel, hard hobbing after carburizing, hardness up to 50 degrees, wear-resistant, no tooth chipping This planetary gearbox is mainly used to reduce speed and increase holding torque , widely applied in CNC machine, such as engraving machine, mill, lathe, work bench, grinding machine etc.