---
product_id: 131887289
title: "2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for CNC Machine and Servo Stepped Motor（5x8mm）"
brand: "befenybay"
price: "92.16 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Befenybay"
url: https://www.desertcart.tn/products/131887289-2pcs-5mm-to-8mm-aluminium-plum-flexible-shaft-coupling-d20
store_origin: TN
region: Tunisia
---

# Flexible coupling reduces stress Precision 5-8mm shaft fit Durable aluminum alloy build 2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for CNC Machine and Servo Stepped Motor（5x8mm）

**Brand:** befenybay
**Price:** 92.16 DT
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your machine’s precision and durability — don’t let misalignment slow you down!

## Quick Answers

- **What is this?** 2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for CNC Machine and Servo Stepped Motor（5x8mm） by befenybay
- **How much does it cost?** 92.16 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/131887289-2pcs-5mm-to-8mm-aluminium-plum-flexible-shaft-coupling-d20)

## Best For

- befenybay enthusiasts

## Why This Product

- Trusted befenybay brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fail-Safe Protection:** Two-piece design allows separation under extreme stress, preventing costly damage to your CNC or 3D printer components.
- • **Unmatched Durability:** Crafted from high-grade aluminum alloy and polyurethane for superior hardness and vibration absorption under heavy torque.
- • **Stress-Free Performance:** Flexible plum-shaped design compensates for minor misalignments, protecting your machine from wear and tear.
- • **Engineered for Precision:** Fits 5mm to 8mm shafts with exacting 0.31-inch diameter tolerance for seamless CNC and servo motor integration.
- • **Easy Installation & Maintenance:** Includes Allen key for quick setup; single set screw clamp ensures secure, no-looseness operation without damaging shafts.

## Overview

This 2-piece aluminum plum flexible shaft coupling set fits 5mm to 8mm shafts, designed for CNC machines, servo motors, and stepper motors. Made from durable aluminum alloy and polyurethane, it absorbs vibration and compensates for minor misalignments, ensuring smooth torque transmission and protecting your equipment from damage. The included Allen key and single set screw clamp enable easy installation and secure fit, making it a reliable upgrade for professional-grade machinery.

## Description

1.Aluminum alloy 2.The Shaft Coupler is not elastic 3.Shaft must be located in a straight line4. If your equipment is eccentric already, then it will make noise and cause off-centering5.The shaft couplers are mainly used for CNC machines,servo motors, spindle, step motor etc Specifications:Product Name: Shaft Plum Coupling Type: Plum Shaped Shaft Usage: 5mm to 8mm / 0.19inch to 0.31inch Size: :L25mm x D20mm/0.98inch x 0.79inch( L*D) Material: Aluminum Alloy,Polyurethane Main Color: Silver Tone,Red Weight: 30g Package Content: 2x Shaft Plum coupling 1x Allen Key Any question or problem, do not hesitate to contact us. we will reply you within 24 hours

Review: These are awesome! Much better than competitor's design. - For some reason the flexible couplers milled from a single piece of aluminum tend to shear on my DIY CNC machine on both the X and Y axis. I've tried different brands and suppliers, including the one in the photo, with the very same results. Within 6 hours of run time it breaks on the simplest of carves, ruining my workpiece. As you can see in the photo and the pictured break, one has to question the mill stock used vs. who mills these from that stock. However, since changing to this 3 piece design, I've been running fine without any issues or mid-carve failures!!! Thanks!
Review: Helps with misalignment and prevent disasters. - I bought these couplers to replace the horrendous ones that came with the Biqu B1SE, as well as on an Ender 3 I had (which to be honest didn't need replacing, but I had a two pack so I threw it on). This style of coupler provides a couple of advantages: -The set screw clamps the coupler around the leadscrew, rather than screws directly into the leadscrew. The stock B1SE coupler has a pair of setscrews that go directly into the leadscrew, and not only did this mean that you can never properly center the leadscrew (because you had to clamp setscrews into it from both sides), but that it also came loose quite often. Nevermind the fact that it can damage the leadscrew itself. The Befenybay couplers required only tightening one set screw and that was it- no fuss and never came loose again. This alone fixed a major pain point of that printer. -The design compensates for minor misalignment. If your leadscrew is extremely bent this probably won't fix any Z-problems you have, but for minor misalignments they can and do work very well. Again, the B1SE has a very long leadscrew which has a very slight offset between the gantry and stepper; this is incredibly obvious because the leadscrew is not parallel to the vertical extrusions and wobble around a lot despite efforts squaring the frame and moving things around to get them perfectly aligned. Installing this coupler, that leadscrew is now parallel and does not show the same level of wobble as before. Printing a test cylindrical tube also shows no z-banding. -It provides an extra level of protection. If something causes your Z-axis to jam or otherwise smash into the bed, the two halves of this coupler actually separates completely allowing the stepper to free spin. In my case, I forgot to remove a tool I used to lock the z-axis into place during maintenance, and the separation of the coupler avoided any additional stress I would have placed on the printer components. I see some comments about this coupler separating prematurely during normal printing, but I hadn't experienced that problem. I can see that if coupler tolerances are bad, this can happen, but also you should be checking to make sure that your gantry is able to move up and down freely (remove the leadscrew and just move it up and down with your arms). Overall, this is a minor improvement over traditional coupler designs. I would not necessarily buy these simply for the sake of an upgrade (as I said, the stock Ender 3 coupler works ok); but if you were already looking to replace couplers for any reason, I think these are a no-brainer to get.

## Features

- Size:L25mm x D20mm/0.98inch x 0.79inch( L*D) Diameter: 5mm to 8mm / 0.19inch to 0.31inch
- Material: Aluminum alloy, polyurethane Type: Plum shaped
- Super torque can absorb vibration, appropriate a large torque transmission.High hardness,and excellent response,not easy to loosen
- Flexibility of coupling shaft removes stress between the motor and driving components
- The shaft couplers are mainly used for CNC machines,servo motors, spindle, step motor etc

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07RMZCLZ3 |
| Best Sellers Rank | #101,913 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,794 in 3D Printer Accessories |
| Brand | Befenybay |
| Color | Silver, Red |
| Compatible Groove Diameter | 8 Millimeters |
| Customer Reviews | 4.3 out of 5 stars 704 Reviews |
| Drive Style | shaft coupling |
| Exterior Finish | Silver |
| Fastener Type | Coupling |
| Finish Types | Silver |
| Grade Rating | Industrial |
| Inside Thread Size | M5 |
| Item Diameter | 0.31 Inches |
| Item Weight | 30 Grams |
| Manufacturer | befenybay |
| Material | Aluminum |
| Material Type | Aluminum |
| Metal Type | Aluminum |
| Model | BE011 |
| Number Of Items | 2 |
| Number of Pieces | 2 |
| Outside Diameter | 0.31 Inches |
| Part Number | BE011 |
| Screw Head Style | Flat |
| Set Name | Befenybay 2-Piece Aluminum Shaft Coupler Set with Allen Key |
| Size Name | D20 L25 |
| Thread Class | Class 2A |
| Thread Coverage | Unthreaded |
| Thread Size | M5 |
| Thread Style | Right Hand |
| Thread Type | Iso Metric |
| UPC | 824007172184 |
| Unit Count | 2.0 Count |

## Product Details

- **Material:** Aluminum
- **Fastener Type:** Coupling
- **Exterior Finish:** Silver
- **Color:** Silver, Red
- **Metal Type:** Aluminum

## Images

![2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for CNC Machine and Servo Stepped Motor（5x8mm） - Image 1](https://m.media-amazon.com/images/I/71hM4JCrZ7L.jpg)

## Questions & Answers

**Q: How hard is to pull the two halves apart?**
A: You can separate the halves with your hands. They are friction fit together but not under any significant pressure. I use them for my two Z axis screws on my 3D printer (motors at bottom) which are always under pressure from the X carriage and they have never separated after 1000+/- prints.

**Q: these actually grip the lead screw right? because the stock spring style, my lead screw crawls up it inside, causing binding, due to poor QC thx**
A: I had problem with mine slipping, No amount of tightening that screw would cause it to hold fast. Resolved with a few drops of CA glue.

**Q: Wil this fix on a cr10s pro v2?**
A: Yes,it can be used for cr10s pro v2

**Q: Which size to get for CR10V3?**
A: It is 5mm to 8mm for cr10 v3

## Customer Reviews

### ⭐⭐⭐⭐⭐ These are awesome! Much better than competitor's design.
*by M***R on October 14, 2020*

For some reason the flexible couplers milled from a single piece of aluminum tend to shear on my DIY CNC machine on both the X and Y axis. I've tried different brands and suppliers, including the one in the photo, with the very same results. Within 6 hours of run time it breaks on the simplest of carves, ruining my workpiece. As you can see in the photo and the pictured break, one has to question the mill stock used vs. who mills these from that stock. However, since changing to this 3 piece design, I've been running fine without any issues or mid-carve failures!!! Thanks!

### ⭐⭐⭐⭐⭐ Helps with misalignment and prevent disasters.
*by C***G on February 7, 2024*

I bought these couplers to replace the horrendous ones that came with the Biqu B1SE, as well as on an Ender 3 I had (which to be honest didn't need replacing, but I had a two pack so I threw it on). This style of coupler provides a couple of advantages: -The set screw clamps the coupler around the leadscrew, rather than screws directly into the leadscrew. The stock B1SE coupler has a pair of setscrews that go directly into the leadscrew, and not only did this mean that you can never properly center the leadscrew (because you had to clamp setscrews into it from both sides), but that it also came loose quite often. Nevermind the fact that it can damage the leadscrew itself. The Befenybay couplers required only tightening one set screw and that was it- no fuss and never came loose again. This alone fixed a major pain point of that printer. -The design compensates for minor misalignment. If your leadscrew is extremely bent this probably won't fix any Z-problems you have, but for minor misalignments they can and do work very well. Again, the B1SE has a very long leadscrew which has a very slight offset between the gantry and stepper; this is incredibly obvious because the leadscrew is not parallel to the vertical extrusions and wobble around a lot despite efforts squaring the frame and moving things around to get them perfectly aligned. Installing this coupler, that leadscrew is now parallel and does not show the same level of wobble as before. Printing a test cylindrical tube also shows no z-banding. -It provides an extra level of protection. If something causes your Z-axis to jam or otherwise smash into the bed, the two halves of this coupler actually separates completely allowing the stepper to free spin. In my case, I forgot to remove a tool I used to lock the z-axis into place during maintenance, and the separation of the coupler avoided any additional stress I would have placed on the printer components. I see some comments about this coupler separating prematurely during normal printing, but I hadn't experienced that problem. I can see that if coupler tolerances are bad, this can happen, but also you should be checking to make sure that your gantry is able to move up and down freely (remove the leadscrew and just move it up and down with your arms). Overall, this is a minor improvement over traditional coupler designs. I would not necessarily buy these simply for the sake of an upgrade (as I said, the stock Ender 3 coupler works ok); but if you were already looking to replace couplers for any reason, I think these are a no-brainer to get.

### ⭐⭐⭐⭐⭐ So far so good
*by P***G on April 2, 2022*

They seem to work. Hard to test it. You have to take the Z rods out all the way to get it to go in. But that's a good time to clean them. The fitting is very loose at first and the screws are very hard to turn. I thought I was going to strip it. Then finally it turned and tightened. I thought I had the wrong size at first.

## Frequently Bought Together

- Befenybay 2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for CNC Machine and Servo Stepped Motor（5x8mm）
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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-09*