0.5 Modulus Brass Gear Reducer Set With 20 Tooth Brass Gear Wheel And 4mm Bore Brass Gear Shaft For Small Machines And DIY Projects Ideal For Hobby Robotics Models CNC Builds Gear Reduction And Precise Motion Control In A Compact Lightweight Duo CNBTR

1x Wheel + 1x Shaft Brass Gear Reducer Set: 20T Wheel, 4mm ✔️ Compact brass gear reducer with 20T wheel and 4mm bore shaft

This compact brass gear reducer kit combines a 0.5 modulus brass gear wheel (20 teeth) with a matching 4 mm bore brass gear shaft. It’s designed for small machines, hobby robotics, DIY CNC builds, and models where precise motion control and a lightweight setup matter.

Part	Dimensions
Wheel (20T)	Height 12 mm (0.47 in); Outer dia 11 mm (0.43 in); Hole dia 4 mm (0.16 in); Overall size 12x11x4 mm; 20 teeth; 11.2 mm dia option
Gear shaft	Height 20 mm (0.79 in); Outer dia 9.7 mm (0.38 in); Inner dia 4 mm (0.16 in); Size 20x9.7x4 mm

Features and specs

✅ Includes 1x 0.5 modulus brass gear shaft and 1x 20T brass gear wheel
✅ Pack includes 2 screws for mounting and assembly
✅ Transmission structure is simple, compact, small, and light
✅ Shaft design enables high transmission ratios with potential multi-stage setups
✅ Brass construction ensures long service life and reliable performance

💡 What is a brass gear reducer used for in hobby robotics and small CNC builds? This handy device helps control speed and torque in tight spaces. - Handy for tight-space robotics and DIY CNC prototypes - Improves precision and repeatability of motion in small machines - Brass gear durability supports longer service life in light-duty setups