--- product_id: 483173891 title: "NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030" brand: "cnctopbaos" price: "$229.05" currency: USD in_stock: true reviews_count: 2 category: "Cnctopbaos" url: https://www.desertcart.us/products/483173891-nmrv30-worm-gearbox-speed-reducer-nmrv030-worm-gear-reducer-speed store_origin: US region: United States of America --- # 14mm output shaft diameter 20:1 precision speed ratio Nema23 compatible input flange NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 **Brand:** cnctopbaos **Price:** $229.05 **Availability:** ✅ In Stock ## Summary > ⚙️ Unlock precision power with CNCTOPBAOS – where control meets durability! ## Quick Answers - **What is this?** NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 by cnctopbaos - **How much does it cost?** $229.05 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/483173891-nmrv30-worm-gearbox-speed-reducer-nmrv030-worm-gear-reducer-speed) ## Best For - cnctopbaos enthusiasts ## Why This Product - Trusted cnctopbaos brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable Build:** High-quality aluminum alloy housing ensures superior thermal management and longevity. - • **Robust Compatibility:** Seamlessly pairs with Nema23 stepper motors for versatile integration. - • **Flexible Installation:** Multi-faceted mounting options adapt effortlessly to your custom setups. - • **Precision Speed Control:** Achieve exact 20:1 speed reduction for flawless automation. - • **Quiet & Smooth Operation:** Engineered for low noise and smooth transmission to keep your workspace professional. ## Overview The CNCTOPBAOS NMRV30 Worm Gearbox Speed Reducer offers a reliable 20:1 speed ratio with a 14mm output shaft, designed specifically for Nema23 stepper motors. Its high-quality aluminum alloy enclosure provides excellent thermal performance and durability, while ensuring smooth, low-noise operation. Ideal for professional automation setups requiring precise speed control and flexible installation. ## Description Product Description Review: Works great! Heavy Duty and affordable for what it is. - This unit is super solid and is a great price for what you get. Gearbox comes fully lubricated and is factory sealed. so don't expect to open it easily (not that you'd need to). It's full of oil and you'd need to remove the rubber gasket without damaging it somehow. The biggest issue I had was finding the appropriate hardware for driving the input side of the gearbox. The main input has an odd inner diameter of 11mm (7/16") with a 4mm wide key and I underestimated how hard it would be to find appropriate components to drive this with a larger shaft. With that said, the manufacturer included coupler that adapts this down to an 8mm d-shaft and that fits standard sized servos traditionally used for this. Review: Arrived with wrong motor mount holes, returning immediately. - As others have said, the mounting holes on this gearbox DO NOT LINE UP WITH NEMA 23 STANDARD HOLES. I bought 4 of them hoping it would be OK. Also, the movement of the gears is quite stiff; definitely use with beefy steppers/servos if you can figure out how to get them to fit. Will be returning these for sure. Absolutely unusable. ## Features - Precision 20:1 Speed Ratio Worm Gear Reducer: Model NMRV030-20 worm gearbox with 20:1 speed ratio, engineered for accurate speed regulation and torque amplification, perfectly matched with Nema23 stepper motors for CNC equipment, industrial automation lines and precision motion control scenarios - Standardized Mounting & Shaft Specifications: Features a 60mm x 60mm (2.36 inch x 2.36 inch) standard Nema23 flange with 47mm x 47mm (1.85 inch x 1.85 inch) motor mounting hole spacing, matched with an 11 mm (0.43 inch) input bore diameter and 14 mm (0.55 inch) output shaft diameter, ensuring seamless installation and full compatibility with most mainstream Nema23 stepper motors/servo motors on the market - High-Strength Aluminum Alloy Enclosure: Made of die-cast aluminum alloy housing, delivers excellent thermal dissipation performance, high rigidity and corrosion resistance; compact structure adapts to limited installation space while effectively extending the service life of the gearbox - Smooth Transmission & Low Noise Operation: Adopts high-precision worm gear and high-quality bearing structure, provides stable transmission with large load-bearing capacity, minimal backlash and low operating noise, suitable for long-term continuous operation in industrial and precision projects - Wide Compatibility: It adapts to most automation scenarios, whether it is a CNC router, small engraving machine, 3D printers, DIY robotic arm, automatic feeding device or student project. It is pre-lubricated and debugged before leaving the factory, and can be used directly without additional maintenance ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09HGY6FSJ | | Best Sellers Rank | #111,188 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #20 in Gearboxes, Gearheads & Speed Reducers | | Brand | CNCTOPBAOS | | Brand Name | CNCTOPBAOS | | Country of Origin | USA | | Customer Reviews | 3.8 out of 5 stars 4 Reviews | | Manufacturer | CNCTOPBAOS | | Material | Aluminium | | Material Type | Aluminium | | Model Number | 3 | | Number of Items | 8 | | Part Number | 3 | ## Product Details - **Brand:** CNCTOPBAOS - **Material:** Aluminium - **Item Weight:** 1.17 Kilograms - **Manufacturer:** CNCTOPBAOS ## Images ![NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 - Image 1](https://m.media-amazon.com/images/I/71HlnfhvCBL.jpg) ![NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 - Image 2](https://m.media-amazon.com/images/I/71Y0lpK-YHL.jpg) ![NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 - Image 3](https://m.media-amazon.com/images/I/61z7wGYvFBL.jpg) ![NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 - Image 4](https://m.media-amazon.com/images/I/71AEZ-bxUiL.jpg) ![NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 - Image 5](https://m.media-amazon.com/images/I/71bnBhit2aL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great! Heavy Duty and affordable for what it is. *by P***T on 1 December 2025* This unit is super solid and is a great price for what you get. Gearbox comes fully lubricated and is factory sealed. so don't expect to open it easily (not that you'd need to). It's full of oil and you'd need to remove the rubber gasket without damaging it somehow. The biggest issue I had was finding the appropriate hardware for driving the input side of the gearbox. The main input has an odd inner diameter of 11mm (7/16") with a 4mm wide key and I underestimated how hard it would be to find appropriate components to drive this with a larger shaft. With that said, the manufacturer included coupler that adapts this down to an 8mm d-shaft and that fits standard sized servos traditionally used for this. ### ⭐ Arrived with wrong motor mount holes, returning immediately. *by W***L on 9 September 2024* As others have said, the mounting holes on this gearbox DO NOT LINE UP WITH NEMA 23 STANDARD HOLES. I bought 4 of them hoping it would be OK. Also, the movement of the gears is quite stiff; definitely use with beefy steppers/servos if you can figure out how to get them to fit. Will be returning these for sure. Absolutely unusable. ## Frequently Bought Together - CNCTOPBAOS NMRV30 Worm Gearbox Speed Reducer NMRV030 Worm Gear Reducer Speed Ratio 20:1 RV30 Square Type for Nema23 Stepper Motor Output Hole 14mm Shaft NMRV-030 - CNCTOPBAOS Output Double Shaft Diameter 14mm 0.55" Dual Output Shaft Length 130mm Fit for Worm Reducer Gearbox NMRV030 RV030 Nema23 Stepper Motor with Gaskets S Ring Corner pin - CNCTOPBAOS 8mm to 11mm Stepper Motor Shaft Sleeve 8x11mm Bore Adapter Turbine Reducer Shaft Sleeve for RV030 Worm Gear Speed Reduce RV30 NMRV030 Gearbox 0.31inch --- ## 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.us/products/483173891-nmrv30-worm-gearbox-speed-reducer-nmrv030-worm-gear-reducer-speed](https://www.desertcart.us/products/483173891-nmrv30-worm-gearbox-speed-reducer-nmrv030-worm-gear-reducer-speed) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-21*