Coupling Torque Density Provides Significant Savings for Pump Applications


PSC’s Series 57 disc coupling is a great fit for pump applications. Much like other disc couplings, PSC provides a long life and low maintenance solution. However, PSC’s unique torque density is what differentiates them from other disc coupling manufacturers. Torque density is the amount of torque a coupling can transmit divided by the coupling’s overall diameter. This simple value has a significant impact on the cost of a coupling. Higher torque dense couplings generally cost less. For instance, gear couplings are typically the most torque dense couplings on the market. In terms of cost per in-lb [Nm] of torque transfer, they are generally regarded as having the lowest up front cost. Unfortunately, low upfront cost products generally have wearable parts, maintenance requirements, and general consumables that end up costing the end user throughout the useable life of the product. This cost is not only the physical cost of parts and maintenance, but it is also the opportunity cost of equipment downtime.

A long life, low maintenance disc coupling is a great alternative to couplings requiring frequent maintenance or consumable wear parts. Traditionally, the downside with disc couplings is a high upfront cost, but PSC is bending the cost curve down. How is this possible? Torque Density! Below are pictures of a competitor (Left) and the PSC Series 57-516 disc coupling (Right). 


The PSC Series 57-516 coupling is 51 mm disc pack with 6 bolts, and the competitor is a 72mm disc pack with 6 bolts. Check out the side by side comparison:


These couplings are virtually identical in performance; however, the PSC Series 57-516 is over 1” [25.4mm] less in diameter. This torque density advantage routinely provides a cost savings of 20% or more for our customers. PSC continues to provide customers significant savings while offering long life products that are 100% made in the USA.