Shaft Coupling Systems

First Quality ~ First Time

Apparatus Repair & Engineering, Inc.

A.R.&E. is the Premier Electric Motor Sales, Service, and Repair facility in the quad-state region of Maryland, Pennsylvania, West Virginia and Virginia. This business was begun in 1927 and we are proud to continue the efforts of the founding partners who have served the local Commercial and Industrial markets over these many years. Times have changed in the many years since the inception of this business, and A.R.&E. has grown and changed with the times. Today the use of AI, computers, and factory automation is necessary for businesses to remain competitive in the global market, and A.R.&E. is here to assist with those challenges. And we promise our work will be... First Quality ~ First Time.

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This is an example of an automated oil dispensing tank and pump system that was totally designed and built by A.R.&E. for a local manufacturer...

Generator Install

Here's what an emergency generator installation can look like when A.R.&E. is involved...


Sometimes it's necessary to "buildup" a metal surface that's been damaged by wear. Metalizing is one method of doing just that...


Total rewind of a customer's electric motor. Sometimes, though no one's fault, an electric motor "burns up." That's when our rewind department shines. Here's the technician is rewinding this small motor, and in a couple of hours it'll be "as good as, (or better than) new"...


Turkey and dressing is the classic dinner at this time of year. Thanksgiving Day is an annual national holiday in the United States and Canada celebrating the harvest and other blessings of the past year. The American tradition has us attempting to recreate the dinner between the Pilgrims and the Native Americans. However you celebrate, we at Apparatus Repair & Engineering, Inc. want to wish you all a Safe, Blessed and Happy Thanksgiving.

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Shaft Couplings

Coupling Types

Shaft Couplings are critical to the operation of so many industrial and commercial applications.

By definition...

A Coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. In a more general context, a coupling can also be a mechanical device that serves to connect the ends of adjacent parts or objects. 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 is exceeded. Selection, installation and maintenance of couplings can lead to reduced maintenance time and maintenance cost.

There are basically two types of shaft couplings; Rigid and Flexible. The Rigid couplings are made up of two designs, the Flanged and the Ribbed (or Sleeve). The Flexible is the larger group and contains the Gear, Grid, Disk, Chain, Elastomeric (Tire), and Jaw types, plus hybrids of most of those common types.

Then, of course, there are "sub-categories" of a lot of these couplings, like "Zero-Backlash", which is a special that we've used to couple tach generators to shafts to make certain there is no "slop" in the drive transmission of RPM's when a process is critical and requires exact numbers. And other types like "Fluid Couplings", which act like a mechanical "soft start" to help absorb shock loads. We've applied them to crushers in the past and they're typically used in higher horsepower applications to reduce voltage/current spikes, and/or applications where starting a load "across the line" would be detrimental to the physical health of the driven equipment. But those are specials and if it's something you need, we'll help you out. For our purposes, here however, it's not the focus of our information on this website.

Rigid Couplings

Flanged Coupling Sleeve Coupling

Description: Rigid couplings are usually used when it is critical that the driver and driven shafts must rotate at precisely the same speed and angle of rotation. Click the picture to be taken to the Rigid Coupling page.

Flexible Couplings

Description: Flexible couplings make up the majority of application solutions in the industrial and commercial world. Click the picture to be taken to the Flexible Coupling main page.