Grundfos Grundfos CM / CME
Grundfos CM horizontal multistage centrifugal pumps, close-coupled, in cast iron or stainless steel, with or without self-priming; CME has an integrated frequency converter.
CM is the Grundfos range of horizontal, multistage centrifugal pumps with axial suction and a directly coupled motor (close-coupled), in self-priming or non-self-priming design. CM has a motor supplied directly from the mains, while CME has a Grundfos MGE motor with integrated frequency converter, to which a pressure sensor can be connected. The range has three material designs: EN-GJL-200 cast iron (the shaft, impellers and chambers remain in 1.4301 stainless steel), 1.4301 (AISI 304) stainless steel and 1.4401 (AISI 316) stainless steel. The pumps work in temperature control, washing and cleaning, pressure boosting and tank filling systems.
The code has the form CM 10-3 A-R-I-E-AVBE F-A-A-N: 10 is the nominal flow at 50 Hz, in m³/h, 3 is the number of impellers, and the letters show the pump version, the connection (R = Rp thread), the material (A cast iron, I stainless steel 1.4301, G stainless steel 1.4401), the rubber parts, the mechanical seal, the voltage, the motor, the plug and the sensor. For a quotation we need the full code from the nameplate and the product number. When the item is available locally or at the supplier, delivery takes 24–72 h, and on order usually 1–4 weeks.
Models and codes
| Code | Note |
|---|---|
| CM 3-5 | Nominal flow of 3 m³/h, with 5 impellers. |
| CM 5-3 | Nominal flow of 5 m³/h, with 3 impellers. |
| CM 5-6 | Nominal flow of 5 m³/h, with 6 impellers. |
| CM 10-3 A-R-I-E-AVBE F-A-A-N | Type code example: 1.4301 stainless steel, Rp threaded connection, supply 3 × 220-240/380-415 V, 50 Hz. |
| CM 15-3 | Nominal flow of 15 m³/h, with 3 impellers. |
| CM 25-2 | Nominal flow of 25 m³/h, with 2 impellers. |
Key specifications
| Nominal flow at 50 Hz (sizes) | 1, 3, 5, 10, 15 and 25 m³/h |
|---|---|
| Number of impellers | 1–14, depending on size |
| Liquid temperature | -20…+120 °C for stainless steel versions with AQQ or AQB seal (up to 10 bar); for the cast iron version, up to +90 °C |
| Maximum operating pressure | up to 16 bar for stainless steel (AQQ, AQB or AUQ seals, up to +90 °C); up to 10 bar for cast iron |
| Materials | cast iron EN-GJL-200, stainless steel 1.4301 or stainless steel 1.4401 |
| Connections | Rp or NPT thread, DIN/ANSI/JIS flange, Victaulic coupling, Tri-Clamp |
| CME motor | MGE with permanent magnets and integrated converter, IE5 class (IEC 60034-30-2) |
| Self-priming | CM 1, CM 3 and CM 5 in stainless steel 1.4301, with liquid at 0…+60 °C and suction lift up to 8 m, depending on size |
The Grundfos data booklet CME, CM, 50/60 Hz, is the 02.2026 edition, with no withdrawal notice.
Frequently asked questions
What does the code CM 5-6 mean?
CM is the range, 5 is the nominal flow at 50 Hz, in m³/h, and 6 is the number of impellers. The full code continues with the design letters, for example A-R-I-E-AVBE, which show the version, the connection, the material and the rubber parts.
How does CME differ from CM?
The hydraulic part and the materials are the same; the motor differs. CME has an MGE motor with integrated frequency converter, which adapts the speed to demand, for example for constant pressure, while CM has a motor supplied directly from the mains.
Can I order the pump directly from the type key?
The type key describes the pump, but not all letter combinations are manufactured. For a quotation we use the full code together with the product number from the nameplate.
Other Grundfos series
We quote the CM or CME pump by the full code and the product number; hydraulic selection, installation and configuration of the frequency converter are outside our quotation.
Updated: 2026-11-12