4 Pack 18 Volt DC Motors With Round Shaft For DIY Projects Drills Robots RC Cars Remote Control Vehicles Saw Repair Replacement Engine 12V To 20V Compatible Beefy Power And Torque

Four-Pack 18V DC Motors with Round Shaft for DIY Projects
✔️ RS-550S brushed DC motors, 6-24V, ~20k no-load RPM, 3.175mm shaft

This four-pack of RS-550S round-shaft DC motors is designed for DIY electronics, robotics, power tools, and RC projects. They’re a popular fit for hobby robots, compact CNCs, PowerWheels, gate openers, and other small tooling applications.

✅ Weight: ~7.7 oz (218 g); L 57 mm (2.24 in); D 37 mm (1.46 in)
✅ Operating voltage: ~6-20 V; optimal 12-18 V; 18 V nominal for best power
✅ Shaft: length ~9 mm (0.35 in); diameter ~3.175 mm (1/8 in); round shaft; stall current ~85 A; no-load RPM ~20,000; peak efficiency ~17,000 RPM
✅ Mounting and fit: two M3 holes, 25 mm apart; designed to replace 3/8 in drills and other cordless tools; verify dimensions before purchase
✅ Notes: confirm shaft length/diameter and overall dimensions match your replacement motor

Designed as a power tool/drill motor, these units can replace motors in many 3/8 in drills and other cordless outdoor tools. They’re also a solid choice for DIY electronics, robotics, lightweight automations, and hobby projects where compact form plus solid torque matters.

💡 What is a round-shaft DC motor like RS-550S best used for in hobby projects?

It’s handy for compact power applications where you need solid torque and speed in a small package.

- Ideal for DIY robotics, RC cars, small automation, and gate-opening setups - Works with common 6-20 V power sources; peak performance near 18 V - Check shaft size 3.175 mm (1/8 in) and length ~9 mm (0.35 in) for a proper fit - Confirm mounting holes and overall dimensions match your current unit before swap