Grundfos Grundfos SP

Grundfos SP stainless steel submersible pumps for wells and boreholes, 4, 6, 8 and 10 inch, with flows from 1 to 280 m³/h.

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SP is the Grundfos range of stainless steel multistage submersible pumps, installed in boreholes or wells, below the water level, or, in industrial applications, in a tank. The range has 17 sizes, from SP 1A to SP 215: 4-inch pumps (up to SP 14), 6-inch (SP 18–SP 60), 8-inch (SP 77, SP 95) and 10-inch (SP 125–SP 215). The basic design is in 1.4301 stainless steel; variant N, in 1.4401 stainless steel, is for slightly aggressive waters, for example brackish water, and variant R, in 1.4539 stainless steel, for highly aggressive waters, for example sea water. The bearings are water-lubricated and have channels through which sand leaves together with the pumped liquid, and a stop ring limits the axial movement of the shaft at start-up.

The code has the form SP 125-10 AA N Rp6 8": SP 125 is the size, 10 is the number of impellers, AA marks the trimmed impellers, and N the 1.4401 stainless steel design; then come the connection, the motor diameter and, for the pump supplied with a motor, the voltage, the frequency, star-delta starting (D) and the power. For a quotation, send us the pump code and the motor code, the product number and the borehole diameter. 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
SP 3A-25	4-inch pump, with MS 402 motor of 1.5 kW.
SP 18-10	6-inch pump, with MS4000 or MS6000 motor of 5.5 kW.
SP 32-6	6-inch pump, 6 impellers, with a 5.5 kW motor.
SP 47-9	6-inch pump, with MS 6000 motor of 13 kW.
SP 60-4	6-inch pump, 4 impellers, with a 7.5 kW motor.
SP 125-2	10-inch pump, with MS 6000 motor of 22 kW.
SP 125-10 AA N Rp6 8" 3 × 380-415 50 D 92 kW	Full code example: 1.4401 stainless steel design, Rp 6 connection, 8-inch 92 kW motor, star-delta starting.

Key specifications

Flow	1–280 m³/h, in 17 sizes (SP 1A … SP 215)
Pump diameter	4" (SP 1A–SP 14), 6" (SP 18–SP 60), 8" (SP 77, SP 95), 10" (SP 125–SP 215)
Materials	stainless steel 1.4301; N variant in stainless steel 1.4401 and R variant in stainless steel 1.4539, for the sizes in which they are made
Maximum sand content	50 (SP 1A–SP 5A), 150 (SP 7–SP 14), 100 (SP 18–SP 60), 50 (SP 77–SP 215) ppm
Motors	MS 402, MS 4000, MS 6000 and rewindable MMS motors, 0.37–250 kW; star-delta starting from 5.5 kW, except 4" motors
Maximum operating pressure	15 bar with MS 402 motor; 60 bar with MS 4000 and MS 6000
Liquid temperature	depending on motor and water velocity past the motor, for example +40 °C for MS 4" T40 (0.15 m/s) and +60 °C for MS6000 T60 (1 m/s); with standard rubber parts, up to +60 °C, and with FKM bearings, up to +90 °C
Connections	Rp 1¼–Rp 6 thread; Grundfos 5" or 6" flange on SP 77–SP 215

The Grundfos data booklet SP A, SP, 50 Hz, is the 06.2026 edition and covers sizes from SP 1A to SP 215; for a design that is no longer produced, we look for the replacement by the pump's product number.

Frequently asked questions

What does the code SP 18-10 mean?

SP 18 is the pump size and 10 is the number of impellers. The letters that may follow show the trimmed impellers (A, B, C), the material (N for 1.4401, R for 1.4539) and the FKM seals (E).

Which design is chosen for brackish water or sea water?

For brackish water, variant N, in 1.4401 stainless steel, is used, and for sea water variant R, in 1.4539 stainless steel. For additional corrosion protection there are zinc anodes.

What data do you need for a replacement SP pump?

The pump code from the nameplate, the type and power of the motor, the voltage, the borehole diameter and, if you know them, the flow and the installation depth. The Grundfos product number helps us identify exactly the same design.

Other Grundfos series

We quote the SP pump and the motor by the codes and data on the nameplates; cable sizing and installation in the borehole are outside our quotation.

Updated: 2026-11-12