--- product_id: 89437714 title: "RS-550S 18V Brushed DC Motor, 3.175mm D-Shaft, 6V-24V, 20K RPM for Drills" brand: "protechtrader" price: "€ 48.68" currency: EUR in_stock: true reviews_count: 12 category: "Pro Tech Trader" url: https://www.desertcart.hr/products/89437714-rs-550s-18v-brushed-dc-motor-3-175mm-d-shaft store_origin: HR region: Croatia --- # 18V Optimal Voltage 3.175mm D-Shaft Precision 20,000 RPM High Speed RS-550S 18V Brushed DC Motor, 3.175mm D-Shaft, 6V-24V, 20K RPM for Drills **Brand:** protechtrader **Price:** € 48.68 **Availability:** ✅ In Stock ## Summary > ⚙️ Upgrade your DIY game with the motor that powers innovation at 20K RPM! ## Quick Answers - **What is this?** RS-550S 18V Brushed DC Motor, 3.175mm D-Shaft, 6V-24V, 20K RPM for Drills by protechtrader - **How much does it cost?** € 48.68 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/89437714-rs-550s-18v-brushed-dc-motor-3-175mm-d-shaft) ## Best For - protechtrader enthusiasts ## Why This Product - Trusted protechtrader brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile Compatibility:** Ideal for drills, RC cars, robotics, and power wheels—upgrade your gear with confidence. - • **Precision 3.175mm D-Shaft:** Engineered for seamless fit and reliable power tool replacements. - • **Turbocharged 20K RPM Speed:** High no-load RPM ensures rapid, efficient operation under load. - • **Compact & Lightweight Design:** Only 7.7oz and 2.24in length for easy integration into custom builds. - • **Power-Packed 18V Performance:** Delivers optimal torque and speed for demanding DIY and robotics projects. ## Overview The RS-550S 18V brushed DC motor features a 3.175mm D-shaft and delivers up to 20,000 RPM at optimal 18V operation. Compact and lightweight at 7.7oz, it offers 70% efficiency and 70.55 oz-in stall torque, making it a versatile upgrade for power tools, robotics, and remote-controlled vehicles. Designed for precision fit and high performance, it’s a trusted choice for professionals and hobbyists alike. ## Description Model RS-550S 18v Shape of Motor Housing: Round Type of Motor: Carbon Brushes Construction: Anisotropic Magnet or Rare Earth Magnet Operating Voltage: ~6v - 24v No Load RPM: ~19300 No Load Current: ~1.2A Stall Torque: ~70.55oz-in (498.2mN-m) Efficiency: ~70% RPM Peak Efficiency: ~17250 Current Peak Efficiency: ~8-10A Dimensions Weight: ~7.7oz (218g) L: 2.24in (57mm) D: 1.46in (37mm) Mounting holes (2): M3 Mounting Holes: 25mm apart Shaft Diameter: 3.175mm (~1/8in) Shaft Style: "D" Shaft Length: 8.2mm Motor Body Diameter: 35mm-37mm Motor Body Length: 57mm Weight: 7.8oz Designed as a Power Tool / Drill motor and may replace motors in many 3/8in drills and other cordless outdoor tools. As well as a popular choice for DIY Electronics and Robotics, PowerWheels, Gate Openers, and More. ***PLEASE NOTE: Will not work or fit in all models, be sure to check your specific applications requirements before purchasing If your replacing a motor please be sure to verify the motor matches your dimensions and shaft length and diameter before purchasing. Review: Common motor - This type of motor is used in many battery operated tools such as drills, etc. I needed it to power a lead screw on a custom cutting machine that I made. The motor has been working flawlessly. Review: Not big enough motor - This motor was not a replacement motor for Dewalt drill.It was way under sized and do not even have teeth or gears on a shaft ## Features - RS-550s Brushed DC Motor with 3.17mm diameter D-Shaft (9mm Long Shaft) Weight: ~7.7oz (218g) Body Length: 2.24in (57mm) Body Diameter: 1.46in (37.5mm) - Operating Voltage: ~6v - 24v | Optimal Volt Range: 12v - 18v | 18 Volt Nominal (Optimal Power, Speed, and Torque near 18 volts) - Shaft Length ~0.35 inch / ~11/32in or ~9mm | Diameter ~0.125 inch / 1/8in or ~3.175mm | Style: Round | Stall Current: ~85A | Efficiency: ~70% | No Load RPM: ~20000 rpms | RPM Peak Efficiency: ~17000 rpms - Designed as a Power Tool Drill motor and may replace motors in many 3/8in drills and other cordless and outdoor tools. Popular choice for DIY Electronics and Robotics, PowerWheels, and some Gate Openers. Will not work or fit in all models, be sure to check your specific application's requirements before purchasing - PLEASE NOTE: If you're replacing a motor please be sure to verify the motor matches your dimensions and shaft length, style, and diameter before purchasing. Please contact the ProTechTrader directly with questions before purchasing. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07DYTM7NQ | | Best Sellers Rank | #293,221 in Toys & Games ( See Top 100 in Toys & Games ) #638 in RC Electric Motors | | Brand | ProTechTrader | | Brand Name | ProTechTrader | | Customer Reviews | 3.9 out of 5 stars 79 Reviews | | Horsepower | 180 Watts | | Included Components | Motor | | Manufacturer | ProTechTrader | | Material | carbon | | Material Type | carbon | | Model | RS-550S-D | | Part Number | RS-550S-D | | Shaft Diameter | 3.18 Millimeters | | Speed | 20000 RPM | | UPC | 789048342517 | | Voltage | 18 Volts | ## Product Details - **Brand:** ProTechTrader - **Horsepower:** 180 Watts - **Material:** carbon - **Speed:** 20000 RPM - **Voltage:** 18 Volts ## Images ![RS-550S 18V Brushed DC Motor, 3.175mm D-Shaft, 6V-24V, 20K RPM for Drills - Image 1](https://m.media-amazon.com/images/I/71DkS5eOPEL.jpg) ## Available Options This product comes in different **Number Of Items** options. ## Questions & Answers **Q: what size shaft adapter would i need to install a v-belt pulley on this motor? thank you** A: A 3.175MM BORE PULLEY WHEEL OF VARYING OUTER SIZE IS YOUR PERFECT FIT. **Q: Will this fit a bosch 18v cordless drill model ddb191?** A: I don't know. You might have to call the company to find out. Sorry!! **Q: Can you change direction by change current direction?** A: Yes, that's the case with any dc motor. Have fun!! **Q: Does this motor require any special kind of driver? ordered this, hooked it up to 18v, 3a power supply. it just sits there an twitches.** A: At 5v-14v is the comfort zone for this motor 18v-24v will spike up intense heat that can inflictse ## Customer Reviews ### ⭐⭐⭐⭐⭐ Common motor *by K***K on August 27, 2023* This type of motor is used in many battery operated tools such as drills, etc. I needed it to power a lead screw on a custom cutting machine that I made. The motor has been working flawlessly. ### ⭐ Not big enough motor *by O***N on November 7, 2025* This motor was not a replacement motor for Dewalt drill.It was way under sized and do not even have teeth or gears on a shaft ### ⭐⭐⭐ Not sure if this is going to work. *by B***Y on July 9, 2025* Item received was not new it appears used. Terminal points have pre-soldered wires snipped off. The packaging was torn open. ## Frequently Bought Together - 18v DC Motor Drill RS-550 D-Shaft 1/8in / 3.175mm Shaft - Fan Cooled High Torque 20K RPM Power Tool Replacement Upgrade 18 Volt (12v - 24v DC) DIY Electric Projects Robots Remote Controlled Car - RS-550s 18v (12v - 20 Volts) DC Motor Round Shaft - High Power & Torque for DIY Electric/Electronic Projects, Drills, Robots, RC Vehicals, Remote Controlled Cars/Robot, Saw Repair/Replacement Engine --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/89437714-rs-550s-18v-brushed-dc-motor-3-175mm-d-shaft](https://www.desertcart.hr/products/89437714-rs-550s-18v-brushed-dc-motor-3-175mm-d-shaft) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-14*