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A jaw coupling consists of two metal hubs and an elastomer (spider). The two metal hubs are generally 45-gauge steel, but the aluminum alloy is also used in cases where sensitive loads are required. The elastomeric jaw coupling uses the elastic element placed between the two halves of the coupling hubs to realize the coupling of the two halves of the coupling.

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Flexible Jaw Type Couplings

The jaw coupling is a universal power transmission coupling. It is designed to transfer torque by connecting two shafts while damping system vibrations and regulating misalignment, thereby protecting other components from damage. A jaw type coupling consists of three parts: two metal hubs and an elastomeric insert called a jaw coupling element, often referred to as a jaw coupling "spider." These three parts are pressed together, and the jaws of each hub are mounted alternately with the impeller of the star wheel. The torque of the flexible jaw coupling is transmitted through the compressed elastomer lobes.

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Jaw Coupling Dimensions


Jaw Coupler

Jaw Coupling Size Chart
Jaw Coupling Sizes

Jaw Coupling Size Chart

Flexible Jaw Couplings Jaw Flex Coupling
Jaw Power Couplings

Jaw Type Flexible Coupling Features 

Elastomers for jaw-type couplings are generally composed of engineering plastics or rubber. The life of the coupling is also the life of the jaw coupling insert. Since elastomers are subject to pressure and not easily subject to tension. Generally, the life of an elastomer is 10 years. Since jaw coupling elastomers have a cushioning and vibration-damping effect, they are often used in applications with strong vibrations. Unlike krute spojnice, the performance limit temperature of the elastomer determines the operating temperature of the coupling, which is generally -35 to +80 degrees.

  • (1) Compact, backlash-free and available in three different hardness elastomers.
  • (2) Absorbs vibration and compensates for radial and angular misalignment.
  • (3) Simple structure, easy maintenance and easy inspection.
  • (4) Maintenance-free, oil-resistant and electrically insulated, operating temperature 20°C to 60°C.
  • (5) plum blossom elastomer with four, six, eight and ten petals.
  • (6)Fixing methods are top wire, clamping, and keyway fixing.

Jaw Shaft Coupler

Jaw Coupling Parts

Jaw Coupling Parts Jaw coupling, also called jaw and spider coupling, is composed of two metal jaw coupling hubs and an elastomer. The two metal hubs are generally 45 gauge steel, but aluminum or stainless steel are also used when sensitive loads are required. The elastomeric jaw coupling uses the elastic element placed between the two halves of the coupling hubs to realize the coupling of the two halves of the coupling. The elastomer jaw couplings have the features of compensation of relative displacement of two shafts, vibration damping, cushioning, small radial dimension, simple structure, no lubrication, high bearing capacity, easy maintenance, etc. However, when replacing the elastic element, the two coupling halves need to move along the axial direction.

Advantages and Disadvantages of a Jaw Coupling

Whether you are installing a jaw coupling for the first time or looking for a replacement, there are some important advantages and disadvantages to consider. While a jaw coupling is a popular choice, they are not for all applications. If you are looking for a high-speed, torque-transmitting coupling, there are other options to consider.

The most obvious advantage to a jaw coupling is that it is inexpensive. Depending on your application, you may need to buy a couple of couplings, or you may be able to get away with a few replacement parts. This saves you money and inventory space.

Another advantage to a jaw coupling is that they are very effective at absorbing shocks. Although they are not as tolerant of misalignment as shear or compression couplings, they are very good at handling a moderate amount of misalignment.

One disadvantage of a jaw coupling is the noise that they produce. If you use a jaw coupling for a continuous-duty electric motor-driven machine, it is important to make sure that the noise is not too loud. This will prevent the motor from causing damage to the driven machinery.

If the noise is not an issue, there are several other advantages to a jaw coupling. First, they can be easily disassembled for inspection. Secondly, the jaw coupling spider is interchangeable. This allows you to replace the spider without removing the jaws. Finally, they are very simple to replace.

The disadvantage to jaw coupling is that they have a very limited range of misalignment. This means that they are not suited for applications that involve frequent start-stop reversing. Also, they are not suitable for precision motion control applications.

China Jaw Coupling

Jaw Coupling Application


As a reliable jaw coupling manufacturer, the jaw-type coupling that we offer is widely used in CNC machine tools, CNC lathes, machining centers, engraving machines, CNC milling machines, computer gongs, metallurgical machinery, mining machinery, petroleum machinery, chemical machinery, lifting machinery, transport machinery, light industry machinery, textile machinery, pumps, fans, etc. China Jaw Coupling

Besides jaw couplings, we also provide other types of fleksibilne spojnice for sale. Feel free to contact us if you are interested!

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