C Series Performance Curves

C Series Close Coupled Dimensions

C Series Flex Coupled & Flange Mounted Dimensions

C Series Optional Features

C Series Engineering Specs

Capacities to 105 GPM Heads to 153 Feet Horizontal Close Coupled

Flange Mounted Centrifugal Pumps MTH Stainless Steel Flange Mounted Centrifugal Pumps offer the best materials available to create the longest lasting pumps for your boiler feed needs.

56C Face Adapter Fits a P31, T31, or C Series Pump to any Standard 56 C-face Motor.

MTH C41 • C51 • C61 Series Pumps

Close-coupled centrifugal pumps from MTH provide economical performance for 5 to 100 GPM applications requiring heads to 140 feet. By combining the latest concepts in pump design with precision manufacturing, the C Series pumps deliver excellent efficiency and low NPSH requirements. Efficient manufacturing processes and highly optimized mechanical designs control costs. Maintenance costs are kept to a minimum by combining a highly serviceable design with quality components to provide a long service life.

Impeller Design

C Series semi-open impellers allow the pump to pass small solids and fibrous material while close running tolerances maintain efficiency and performance. Impellers are pre-trimmed to be non-overloading to the pump and motor size indicated.

NPSH Requirements

C Series centrifugal pumps meet low net positive suction head requirements (NPSHR) without sacrificing efficiency. This is achieved by low fluid inlet velocity and gentle acceleration to peripheral velocities.

Mechanical Seal Box

The large seal chamber provides a wide fluid passage area for maximum cooling of the seal faces and allows debris and gases to be flushed away.

Axial Balance System

The C Series pumps utilize a thrust balancing system which combines the advantages of both static and dynamic balancing techniques to reduce axial thrust and provide longer bearing life.

D3 Motors

Similar to the T31 Series, the C Series takes advantage of our custom manufactured dual face D3 motors that incorporate a 304 stainless steel shaft and heavy-duty bearing. The stainless steel shaft eliminates the necessity of a shaft sleeve, thereby reducing the parts count and simplifying maintenance and servicing procedures. All D3 motors also feature a two-pole 50/60Hz rating, as well as CE Mark approval useful for OEM's with worldwide customers. The three-phase versions of the D3 motors feature a compact TEFC enclosure and a range from 1/3 to 3HP. The single phase D3 motors have an ODP enclosure and a range from 1/3 to 2HP.

Adjustable Casing

C Series pump casings are axially adjustable allowing the use of custom impellers for OEM applications and to allow restoration of performance by closing up the internal clearances that develop over the course of a unit's extended service life.

Quick Selection Guide
4" Pump	1/3 HP	1/2 HP	3/4 HP	1 HP	1 1/2 HP
1/2 X 3/4 X 4	C41AB	C41AB	---	---	---
3/4 X 1 X 4	C41BC	C41BC	---	---	---
1 X 1 1/4 X 4	C41CD	C41CD	C41CD	---	---
1 1/4 X 1 1/2 X 4	---	C41DE	---	---	---
1 1/2 X 2 X 4	---	---	---	C41EF	C41EF
5" Pump		1/2 HP	3/4 HP	1 HP	1 1/2 HP	2 HP
1/2 X 3/4 X 5		C51AB	C51AB	C51AB	---	---
3/4 X 1 X 5		---	---	C51BC	C51BC	---
1 X 1 1/4 X 5		---	---	---	C51CD	C51CD
6" Pump					1 1/2 HP	2 HP	3 HP*
1/2 X 3/4 X 6					C61AB	---	---
3/4 X 1 X 6					---	C61BC	C61BC*
1 X 1 1/4 X 6					---	---	C61CD*
*3 HP Motors are only available in Three Phase Configuration at this time.

For a copy of the C Series Manual and C Series Parts List, go to the Product Support Page.

Download a printable version of the C Series Product Bulletin in .pdf format.

Download the complete C Series Series Section (curves and dimensions) from the Standard Products Catalog.

Download a printable, metric version of the C Series Catalog Pages (curves and dimensions) in .pdf format.