--- product_id: 169252967 title: "8mm to 8mm Shaft Coupling 25mm Length 18mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector for 3D Printer CNC Machine DIY Encoder(Pack of 2" brand: "xnrtop" price: "VT147" currency: VUV in_stock: false reviews_count: 4 url: https://www.desertcart.vu/products/169252967-8mm-to-8mm-shaft-coupling-25mm-length-18mm-diameter-stepper store_origin: VU region: Vanuatu --- # 8mm to 8mm precision fit 25mm length x 18mm diameter compact size Aluminum alloy for lightweight durability 8mm to 8mm Shaft Coupling 25mm Length 18mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector for 3D Printer CNC Machine DIY Encoder(Pack of 2 **Brand:** xnrtop **Price:** VT147 **Availability:** ❌ Out of Stock ## Summary > ⚙️ Elevate your DIY game with precision and durability in every turn! ## Quick Answers - **What is this?** 8mm to 8mm Shaft Coupling 25mm Length 18mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector for 3D Printer CNC Machine DIY Encoder(Pack of 2 by xnrtop - **How much does it cost?** VT147 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/169252967-8mm-to-8mm-shaft-coupling-25mm-length-18mm-diameter-stepper) ## Best For - xnrtop enthusiasts ## Why This Product - Trusted xnrtop brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Set Screw Clamping:** Secure, reliable connection with coiling clamping screws for easy installation and maintenance. - • **Durable Aluminum Alloy:** Lightweight yet robust material resists wear and corrosion, built to last through countless DIY projects. - • **Versatile Compatibility:** Perfect for 3D printers, CNC machines, encoders, and light to medium duty drive systems—upgrade your build effortlessly. - • **Precision Fit, Zero Backlash:** Ensures smooth, accurate torque transfer with no play for flawless 3D printing and CNC performance. - • **Stress-Relieving Flexibility:** Spring action absorbs misalignments and shaft end-play, protecting your motor and components from damage. ## Overview The Xnrtop 8mm to 8mm shaft coupling is a compact, aluminum alloy connector designed for 3D printers, CNC machines, and encoders. Measuring 25mm in length and 18mm in diameter, it features zero backlash and set screw clamping for secure, precise torque transmission. Its flexible spring design absorbs misalignments, reducing stress on motors and components, making it ideal for light to medium duty applications. ## Description Description: 8mm to 8mm shaft usage diameter, 25mm length, 18mm diameter, set screw type, beam coupling. Zero backlash. One-piece metallic spring coupling. For little torque shaft connect. Absorption of parallel, angular misalignments and shaft end-play by spring action. Widely used in drive systems for encoders, instrumentation,lead screws, small pumps, feed rollers and anywhere light to medium duty, torsionally flexible coupling is required. Specification: Feature: Set screw (coiling clamping) Size: 25x18mm/ 0.98x0.71inch( L*D) Material: Aluminum alloy Main Color: Silver tone Weight: 26g Package Content: 2 x Shaft coupling Review: Works great - Was just as described Review: Weak! - Shredded first turn out of the box. ## Features - Shaft Usage: 8mm to 8mm / 0.31 to 0.31 inch - Material: Aluminum alloy; Size: 25x18mm/ 0.98x0.71 inch( L*D) - Feature: Set screws (Coiling Clamping); Main Color: Silver tone - Flexibility of coupling shaft removes stress between the motor and driving components. - The shaft couplers are widely applied to small CNC machines encoding and 3D printers Z shaft coupling, simplifies the debugging difficulty. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07YD45PY8 | | Best Sellers Rank | #309,069 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #39 in Flexible Beam Couplings | | Brand | Xnrtop | | Color | Silver | | Compatible Groove Diameter | 18 Millimeters | | Customer Reviews | 3.9 3.9 out of 5 stars (30) | | Exterior Finish | Aluminum | | Fastener Type | Coupling | | Finish Types | Silver | | Grade Rating | Commercial | | Inside Thread Size | M12 | | Item Diameter | 18 Millimeters | | Item Dimensions | 2 x 1 x 2 inches | | Item Weight | 20 Grams | | Manufacturer | Xnrtop | | Material Type | Aluminum | | Metal Type | Aluminum | | Model | 8x8MM（D18*L25） | | Number of Pieces | 2 | | Part Number | 8x8MM（D18*L25） | | Screw Head Style | Flat | | Set Name | Pack of 2 | | Size Name | Small | | Thread Class | Coarse | | Thread Coverage | Fully Threaded | | Thread Size | 1-1/2"-4 | | Thread Style | Left Hand | | Thread Type | Unified National Coarse (Unc) | | UPC | 745672480902 | ## Product Details - **Color:** Silver - **Exterior Finish:** Aluminum - **Fastener Type:** Coupling - **Material:** Aluminum - **Thread Size:** 1-1/2"-4 ## Images ![8mm to 8mm Shaft Coupling 25mm Length 18mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector for 3D Printer CNC Machine DIY Encoder(Pack of 2 - Image 1](https://m.media-amazon.com/images/I/51H9NVwJGoL.jpg) ![8mm to 8mm Shaft Coupling 25mm Length 18mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector for 3D Printer CNC Machine DIY Encoder(Pack of 2 - Image 2](https://m.media-amazon.com/images/I/51FIR8J3iYL.jpg) ![8mm to 8mm Shaft Coupling 25mm Length 18mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector for 3D Printer CNC Machine DIY Encoder(Pack of 2 - Image 3](https://m.media-amazon.com/images/I/51QNbbTI3qL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great *by A***R on December 12, 2019* Was just as described ### ⭐ Weak! *by J***Y on February 5, 2026* Shredded first turn out of the box. ### ⭐ Can't handle moderate torque *by B***N on August 24, 2020* These couplings are very weak to torque. I sheared 2 of them on my z axis within 2 days of use. --- ## 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.vu/products/169252967-8mm-to-8mm-shaft-coupling-25mm-length-18mm-diameter-stepper](https://www.desertcart.vu/products/169252967-8mm-to-8mm-shaft-coupling-25mm-length-18mm-diameter-stepper) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-02*