Lovejoy coupling drawing

Lovejoy coupling drawing DEFAULT
Most products in the industrial sector have straight forward naming conventions that can be easily understood by looking at the specification sheets of the related components. Be it max torque, length, outside diameter... there is usually some rhyme or reason to the sizes of a given product.
But what about the Lovejoy jaw coupling? What exactly does the "35" mean in an L035, and how is that relative to the "150" in an L150 jaw coupling?  Looking through a catalog, the answer is far from obvious. No single feature of the coupling matches these numbers.

The secret lies in history. At one point in time, remember Lovejoy first launched the jaw coupling in 1927, the number signified the max bore of the jaw coupling. A L035 had a max bore of 0.35 inches, and a L150 had a max bore of 1.5 inches.  Over time, given technical advances of steel and rubber technology (Lovejoy's elastomeric spiders were original not rubber but layered leather), the max bore of these coupling hubs increase while the components themselves maintained the same external dimensions.

Given the product dimensions remained the same (other than they could now be bored out larger), Lovejoy opted to maintain the legacy naming structure... and not rename it every time technology allowed the performance specs of the product to be increased.

Today a L035 has a max bore of 0.375 inches and the L150 has a max bore of 1.875 inches.
Bonus Fun Fact: Lovejoy's proprietary standard NBR rubber spiders have and continue to include SOX in the product description. While many (internally and externally) assume that SOX is an acronym or reference to a feature of the product, the reality is much more lighthearted. Around the time of the spider's development, the owners of Lovejoy (located in Chicago) were close to members of the Chicago White Sox (and also avid fans). As such, "SOX" was embedded into the product description as a hidden shout out to Lovejoy's favorite baseball team. Today's Lovejoy is heavily splintered, both in regards to favorite baseball teams as well just about every other professional sport, so perhaps this information should be suppressed? Nahhhh.... this blog is like TMZ. The cat is out of the bag!

Lovejoy L190 Couplings- Jaw Type Coupling & Spider

Lovejoy L190  Couplings- Jaw Type Coupling & Spider

Lovejoy L190 Couplings

We deal in Standard L190 Type coupling hub

Materials available are either sintered iron (L035-L190) or cast iron (L225-L276).

The L Type Lovejoy Jaw coupling coupling consists of two standard L Type hubs and one spider.

Unless stated otherwise, hub torque and horsepower ratings assume a SOX(NBR) rubber spider is being used.

Spiders Lovejoy L190 Couplings

L190 Type Couplings is available in Stock in our India warehouse . We have lovejoy coupling spider in Stock as well. We keep almost all love joy coupling sizes for Ready Despatch . Contact us for Pricing or Standard Pricelist.We also keep Octaforce Jaw Couplings in Stock.

Octaforce L190 Couplings

Coupling SizeLength thru BoreOutside Diameter
L1901.94 in4.50 in
49.28 mm114.30 mm


Click here to request a Lovejoy Coupling Catalogue PDF

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Jaw coupling

Computer drawing of a curved jaw coupling

A jaw coupling is a type of general purpose power transmission coupling that also can be used in motion control (servo) applications. It is designed to transmit torque (by connecting two shafts) while damping system vibrations and accommodating misalignment, which protects other components from damage. Jaw couplings are composed of three parts: two metallic hubs and an elastomer insert called an element, but commonly referred to as a "spider". The three parts press fit together with a jaw from each hub fitted alternately with the lobes of the spider. Jaw coupling torque is transmitted through the elastomer lobes in compression.


The elastomer of the spider can be made in different materials and hardness, which allows the user to customize the coupling to best serve their application. Considerations for elastomer selection include ability to dampen vibration, ability to handle misalignment, operational temperature range, speed of equipment, and chemical conditions.[1]

Jaw couplings are considered "fail-safe" because, should the elastomer fail or wear away, the jaw coupling hub teeth will mate, much like teeth on two gears, and continue to transmit torque. This may or may not be desirable to the user depending on the application.[2]

Jaw couplings elastomers are wearing elements that do need to be inspected and replaced. Jaw coupling elastomers often have signature wear patterns, and failures can often be root caused based on the condition of the elastomer and hubs. Common failure causes include misalignment, over-torque, chemical exposure, temperature exposure, torsional vibrations, and hub failure.[3]

Jaw couplings are available in both straight tooth jaw and curved jaw design. The straight tooth design enables elastomers to be attached and removed radially, including a "not fail-safe" jaw elastomer in-shear design. For the elastomer in-shear design, the coupling hub teeth are no longer inter-meshed, so an elastomer failure will result in no torque being transmitted. When used with a stiff elastomer, the curved jaw design can maintain a zero-backlash fit required for many motion control applications.[4]

Zero-backlash curved jaw couplings are best suited for applications that rely on a stop-and-go type of movement, where accuracy needs to take place upon stopping in order to perform any number of precision tasks, such as taking a high resolution picture (machine vision system). Absorbing vibrations decreases the settling time the system needs, which increases through-put. The curved jaw coupling is less suited for applications that rely on a constant scanning type of motion, where accuracy is required during movement, which requires a torsionally stronger coupling.

Like other flexible couplings, jaw couplings are limited in the shaft misalignment that they can accommodate. Too much axial motion will cause the couplings to come apart, while too much angular or parallel misalignment will result in bearing loads that may lead to premature system wear or failure.[5]

With its damping capability, interchangeable spiders, and wide variety of custom options, jaw couplings make a great solution for shock absorption and torque transmission in many applications.

See also[edit]

  • Oldham coupler, a form of two-jawed jaw coupling where the centre spider is long, allowing the two halves to be displaced radially.


  1. ^Jaw coupling spider materials hold the key to solving customer application challenges, retrieved 2014-12-04.
  2. ^Jaw Coupling Overview - Features & Benefits, Design Basics, and Element Options, retrieved 2014-12-04.
  3. ^MPTA C5c - Common Causes of Jaw Coupling Failures - (MPTA-C5c-2010)(PDF), retrieved 2014-12-04.
  4. ^Jaw Coupling Overview - Features & Benefits, Design Basics, and Element Options, retrieved 2014-12-04.
  5. ^Coupling Failure Analysis - Jaw Couplings (includes hub & spider photos), retrieved 2014-12-04.
jaw couplings and and the correct installation of a complete set of jaw couplings - KING MECHANICAL

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Drawing lovejoy coupling

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What is a flexible coupling?

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