Aluminum OD:20mm L:25mm Flexible Spider Shaft Coupling Bore: 5x8mm

(1 customer review)

In stock

SKU: 51750
  1. Type: Flexible Plum Shaft Coupling.
  2. Structure: Jaw / Spider.
  3. Material: Aluminium.
  4. Bore Diameter (d1): 5 mm
  5. Bore Diameter (d2): 8 mm


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Category: 3D Printer Coupling
Tags: Motor Coupling, Spider Shaft Coupling, 5x8 mm Motor Coupling

These are also called as Elastomer Couplings because they are equipped with plastic or rubber material between the pair of aluminum jaws. Elastomeric types of couplings are capable of providing shock absorption. Minimum backlash is another great advantage of this Aluminum OD:20mm L:25mm Flexible Spider Shaft Coupling Bore: 5x8mm.

This Flexible coupling with the outer diameter of 20mm and the length of 25mm is machined aluminum coupling. They consist pair of jaw hubs that mate with elastomeric spiders.

The screws that clamp the shafts will be tightened, but not too much. These types of clamping couplings will not damage the shafts. It offers a very easy connection and disconnection. They are useful in reducing the angular and axial misalignment.

The main attraction of this Aluminum OD:20mm L:25mm Flexible Spider Shaft Coupling Bore: 5x8mm is its vibration damping ability.

One important thing to consider is all elastomers will break down over time. Avoid using elastomeric couplings in environments that will expose it to high temperatures or UV light because operating in these environments will reduce the coupling’s lifecycle considerably.

Some of the important features of flexible shaft coupling are,

  1. A coupling is a device which transmits power and torque. Couplings do not normally allow disconnection of shafts during operation. However, there are torque limiting couplings which can slip or disconnect when some torque limit exceeds.
  2. By careful selection, installation and maintenance of couplings, substantial savings are possible in reduced maintenance costs and downtime.
  3. It can protect the driving and driven shaft members against harmful effects because of misalignment of the shafts, sudden shock loads, shaft expansion or vibrations etc.

First bore diameter is 5mm and the second bore diameter is of 8mm also.

Note: We also provide EasyMech Couplings which are Robu.ins new branded coupling, don’t forget to check for future use.

Motor Coupling

Features :

  1. Corrosion resistance and High Durability
  2. The structure is simple which makes it easy to install
  3. Torsional stiffness: Zero backlash
  4. Low moment of inertia offering constant velocity

Package Includes :

1 x Aluminum OD:20mm L:25mm Flexible Spider Shaft Coupling Bore: 5x8mm

Item Type:

Flexible Shaft Coupling



Bore Diameter (mm)

5 x 8

Length (mm):


Bore Diameter [d1] (mm)


Bore Diameter [d2] (mm)


Outer Diameter (OD) (mm)


Weight (g):


Shipping Weight 0.02 kg
Shipping Dimensions 3 × 3 × 2 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects. Replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Based on 1 review

5.0 overall

Add a review

  1. nachiketcorr (verified owner)

    It’s hard to find spider couplings that work well. The poorly designed ones have too much play and don’t hold the polymer insert securely, thereby affecting the Z-axis accuracy on printers such as the Creality Ender 3.

    Kudos to Robu’s procurement team for stocking some really great spider couplers. These don’t have any play, while being flexible enough to serve their intended purpose. Definitely give these a try if you have been facing Z-banding issues with your 3D printer, which is unfortunately always the case with Creality and other Chinese printers.


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Country Of Origin: China