Triple seal stack
A sand guard, back-to-back NBR lip seals and a spring-loaded tungsten-carbide mechanical seal. The sand guard stays intact at 3,500 rpm.
8″ · KM8
L 2,040 mm200 HPL 1,255 mm
Submersible motors · 8″ borehole
KOMAX KM8 Series:8” Submersible Water-Cooled Motor
Built for large-scale irrigation and industrial water lifting where reliability at high power matters. 13 models from 30 to 200 HP, a standard double flange, and a Kingsbury thrust bearing rated for 80,000 N.
- Power range
- 30 HP (22 kW) – 200 HP (150 kW)13 models · 2-pole
- Speed
- 2-pole2,900 rpm @ 50 Hz · 3,600 @ 60 Hz
- Voltage
- 380–415 V50 Hz · or 460 V @ 60 Hz
- Mounting
- Double flangeNEMA coupling, spline shaft
- Thrust load
- 80,000 NKingsbury type
- Immersion
- 200 mMax. depth · IP68
ConstructionStandard · Cast iron with NSF Certified EpoxyOptional · SS316 & SS2205 (Duplex Steel)
IEC 60034-1NSF/ANSI/CAN 61CEPSQCA
Overview
Heavy-duty power for 8-inch boreholes.
Typical applications
- Agricultural tube wells
- Pivot irrigation
- Municipal water supply
- Industrial process water
- Housing societies
- Mixed-flow FX & KPS pump-sets
- Wet stator design
- Re-windable
- High-grade material
- High sand resistance
- High thermal capacity
- High efficiency
- Easy maintenance
- Long service life
- PT100 sensor provision
- Eco-friendly filler fluid
- Vertical or horizontal
- Delta & star (WYE)
Construction
What’s inside, part by part.
Taken from the cross-section in the catalog. Each detail exists to keep sand out, heat down and the shaft true.
Independent cable seal
A rubber gasket sandwiched between nylon plates and clamped by a steel plate on M8 bolts. The lead exits the lower flange to avoid damage during assembly.
Slanted fill holes
Positioned for maximum fluid level inside the motor, and easy to reach even with the pump coupled.
M800 low-loss stack
A longer stack of high-grade silicon steel gives lower core losses, lower current and a cooler-running motor. The ends are welded to threaded flanges.
BOPET+BOPP copper
Electrolytic solid copper rated above 100 °C, with an oversized gauge and mechanised coil insertion.
AISI 431 spline shaft
Induction-hardened to 40 HRC and ground along its full length, with copper-bar rotor slots. Standard coupling dimensions.
Double carbon bushes
Water-lubricated guide bearings in both brackets. A tapered balancing ring guides flow into the bushes for cooling.
Kingsbury thrust bearing
A carbon disc on hardened 400-series stainless shoes. Custom thrust ratings are available on request.
PT100 provision & NBR bellow
A PT100 port for real-time temperature monitoring. The NBR bellow compensates for heat expansion and depth pressure.
IP68Protection
A / BInsulation class
50 °CAmbient water
+6/−10%Voltage tolerance
Vert./Horiz.Mounting
16 cm/sMin. cooling flow
200 mMax. immersion
10Max. starts / hour
Rotation CCW facing shaft end · Water + non-toxic antifreeze filler · Wooden case packing.
Model selector
Pick the power. Get the full data sheet.
Choose your grid frequency and rating to see current, efficiency, power factor, dimensions, weight and recommended cable for that exact model.
Supply
Motor rating (HP)
Sizing a pump-set? Send us your flow and head and we’ll match the motor to the hydraulics.
KM8 0750T
Service factor —
- Speed
- —
- Full-load current
- —
- SF current
- —
- Power factor
- —
- Thrust capacity
- —
- Weight
- —
- Cable · DOL
- —
- Cable · Star-delta
- —
Efficiency · power factor at load
50 %—%—
75 %—%—
100 %—%—
Bars scaled 70–90 % for readability. cos φ shown in grey.
Motor length (mm)
Packing — mm · — kg packed
Data from catalog KM-R0426. Specifications subject to change.Quote this model
Electrical data
Three-phase motor data for every rating.
Scroll sideways on small screens →
| Motor size | Current (A) | Efficiency % at load | Power factor (cos φ) at load | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Motor type | HP | kW | RPM | Full load | Safety | 50 | 75 | 100 | 50 | 75 | 100 | SF |
| KM8 0300T | 30 | 22 | 2,880 | 46.4 | — | 78.5 | 84.3 | 83.6 | 0.70 | 0.79 | 0.83 | 1.00 |
| KM8 0400T | 40 | 30 | 2,875 | 60.9 | — | 79.0 | 84.8 | 84.1 | 0.71 | 0.80 | 0.84 | 1.00 |
| KM8 0500T | 50 | 37 | 2,870 | 74.7 | — | 80.1 | 85.0 | 84.4 | 0.72 | 0.81 | 0.85 | 1.00 |
| KM8 0600T | 60 | 45 | 2,875 | 89.7 | — | 80.8 | 85.8 | 84.9 | 0.72 | 0.81 | 0.85 | 1.00 |
| KM8 0750T | 75 | 56 | 2,870 | 110.8 | — | 82.4 | 86.7 | 85.8 | 0.72 | 0.80 | 0.85 | 1.00 |
| KM8 0800T | 80 | 60 | 2,875 | 116.9 | — | 82.4 | 86.9 | 86.1 | 0.72 | 0.81 | 0.86 | 1.00 |
| KM8 0900T | 90 | 67 | 2,880 | 133.5 | — | 82.7 | 86.4 | 85.6 | 0.72 | 0.80 | 0.85 | 1.00 |
| KM8 1000T | 100 | 75 | 2,875 | 146.1 | — | 82.6 | 86.8 | 86.1 | 0.73 | 0.81 | 0.86 | 1.00 |
| KM8 1100T | 110 | 82 | 2,880 | 161.5 | — | 82.7 | 86.8 | 85.9 | 0.72 | 0.81 | 0.85 | 1.00 |
| KM8 1250T | 125 | 93 | 2,875 | 180.9 | — | 83.9 | 87.0 | 86.3 | 0.73 | 0.82 | 0.86 | 1.00 |
| KM8 1500T | 150 | 112 | 2,875 | 215.1 | — | 82.6 | 86.8 | 86.7 | 0.73 | 0.82 | 0.87 | 1.00 |
| KM8 1750T | 175 | 130 | 2,875 | 252.7 | — | 83.1 | 86.9 | 86.3 | 0.73 | 0.82 | 0.86 | 1.00 |
| KM8 2000T | 200 | 150 | 2,860 | 291.1 | — | 86.9 | 87.8 | 86.1 | 0.72 | 0.81 | 0.86 | 1.00 |
| Motor size | Current (A) | Efficiency % at load | Power factor (cos φ) at load | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Motor type | HP | kW | RPM | Full load | Safety | 50 | 75 | 100 | 50 | 75 | 100 | SF |
| KM8 0300T | 30 | 22 | 3,470 | 40.5 | 46.6 | 78.3 | 84.2 | 83.5 | 0.70 | 0.79 | 0.83 | 1.15 |
| KM8 0400T | 40 | 30 | 3,465 | 53.4 | 61.5 | 78.9 | 84.5 | 83.8 | 0.71 | 0.80 | 0.84 | 1.15 |
| KM8 0500T | 50 | 37 | 3,460 | 65.5 | 75.5 | 80.1 | 84.7 | 84.2 | 0.72 | 0.81 | 0.85 | 1.15 |
| KM8 0600T | 60 | 45 | 3,475 | 78.8 | 91.2 | 81.0 | 85.5 | 84.6 | 0.72 | 0.80 | 0.84 | 1.15 |
| KM8 0750T | 75 | 56 | 3,480 | 96.6 | 110.9 | 82.3 | 86.9 | 86.1 | 0.72 | 0.81 | 0.84 | 1.15 |
| KM8 0800T | 80 | 60 | 3,470 | 102.4 | 117.9 | 82.2 | 86.7 | 85.9 | 0.72 | 0.81 | 0.85 | 1.15 |
| KM8 0900T | 90 | 67 | 3,480 | 116.6 | 134.0 | 82.6 | 86.1 | 85.4 | 0.72 | 0.80 | 0.85 | 1.15 |
| KM8 1000T | 100 | 75 | 3,475 | 127.8 | 147.2 | 84.1 | 86.6 | 85.9 | 0.72 | 0.81 | 0.85 | 1.15 |
| KM8 1100T | 110 | 82 | 3,485 | 141.1 | 162.4 | 82.4 | 86.5 | 85.7 | 0.71 | 0.80 | 0.85 | 1.15 |
| KM8 1250T | 125 | 93 | 3,480 | 158.4 | 182.5 | 83.8 | 86.8 | 86.1 | 0.73 | 0.81 | 0.86 | 1.15 |
| KM8 1500T | 150 | 112 | 3,475 | 188.5 | 217.2 | 82.5 | 86.7 | 86.4 | 0.72 | 0.82 | 0.86 | 1.15 |
| KM8 1750T | 175 | 130 | 3,480 | 221.0 | 254.2 | 82.9 | 86.7 | 86.1 | 0.73 | 0.81 | 0.86 | 1.15 |
| KM8 2000T | 200 | 150 | 3,480 | 249.7 | 284.0 | 88.0 | 89.2 | 88.4 | 0.70 | 0.80 | 0.85 | 1.15 |
Values as published in catalog KM-R0426. Safety-factor current applies at 60 Hz (SF 1.15).
Tail cable selection
| Start | Volts | HP | Cable (mm²) | Qty |
|---|---|---|---|---|
| DOL | 380–415 / 460 | 30 – 50 | 1 × 10 / 16 | 3 |
| DOL | 380–415 / 460 | 60 – 80 | 1 × 16 | 3 |
| DOL | 380–415 / 460 | 90 – 125 | 1 × 25 | 3 |
| DOL | 380–415 / 460 | 150 – 200 | 1 × 35 | 3 |
| Star-delta | 380–415 | 30 – 125 | 1 × 16 | 6 |
| Star-delta | 460 | 150 – 200 | 1 × 25 | 6 |
5 m tail cable per core, plus an additional 1 × 12 mm² 5 m core for earthing.
Construction options
Choose the metallurgy for your water.
Not sure which? Send us a water analysis with your enquiry and we’ll recommend one.
Cast iron, NSF-certified epoxy
The right choice for most fresh-water wells: agriculture, municipal supply and general industrial duty.
- Brackets & housingsCast iron, NSF Certified Epoxy
- ShaftAISI 431 stainless
- Fasteners & flangesAISI 304/316
- Drinking waterNSF/ANSI/CAN 61
SS316 & SS2205 (Duplex Steel)
For saline, brackish or chemically aggressive water, coastal installations and food or pharma process water.
- Brackets & housingsSS316 or SS2205 duplex
- ShaftAISI 431 / SS316
- Fasteners & flangesSS316
- Best forCorrosive / saline wells
Spare parts
Every part, coded and in stock.
Quote the item code with your spares order. Genuine KOMAX parts keep the motor at factory efficiency after an overhaul.
Parts list · material & quantityShow
| Pos. | Item code | Part name | Material | Qty |
|---|---|---|---|---|
| 1 | 60161050 | Sand Guard | Rubber | 1 Nr |
| 2 | 60161252 | Bolt Allen M6 × 20 | Stainless Steel AISI 304/316 | 12 Nr |
| 3 | 60161085 | Mechanical Seal Cover | Stainless Steel AISI 304/316 | 1 Nr |
| 4 | 60161127 | Oil Seal 38 × 60 × 10 | NBR | 2 Nr |
| 5 | 60161125 | Bush Seal Support | Cast Iron / SS AISI 316 | 1 Nr |
| 6 | 60161220 | O-Ring 65 × 2.5 | NBR | 1 Nr |
| 7 | 60161275 | Mechanical Seal Complete | Tungsten Carbide + NBR + Stainless Steel | 1 Nr |
| 8 | 60161065 | Top Piece / Upper Support, Double Flange | Cast Iron / SS AISI 316 | 1 Nr |
| 9 | 60101485 | PT100 Sensor | Stainless Steel AISI 316 | 1 Nr |
| 10 | 60161250 | Bolt Allen M8 × 20 | Stainless Steel AISI 304/316 | 14 Nr |
| 11 | 60161267 | Bonded Washer / Dowty Seal M8 | NBR + SS AISI 316 | 1 Nr |
| 12 | 60101157 | Bonded Washer / Dowty Seal M10 | NBR + SS AISI 316 | 8 Nr |
| 13 | 60101068 | Bolt Allen M10 × 16 | Stainless Steel AISI 304/316 | 2 Nr |
| 14 | 60161255 | Bolt Allen M16 × 75 | Stainless Steel AISI 304/316 | 4 Nr |
| 15 | 60161272 | Bonded Washer / Dowty Seal M16 | NBR + SS AISI 316 | 4 Nr |
| 16 | 60161253 | Bolt Allen M8 × 25 | Stainless Steel AISI 304/316 | 2 Nr |
| 17 | 60161150 | Cable Top Cover Plate | Stainless Steel AISI 304/316 | 2 Nr |
| 18 | 60161092 | Washer Nylon | Nylon | 2 Nr |
| 19 | 60161095 | Gasket Rubber | NBR | 1 Nr |
| 20 | 60161254 | Bolt Allen M8 × 35 | Stainless Steel AISI 304/316 | 1 Nr |
| 21 | 60161263 | Spring Washer M8 | Stainless Steel AISI 304/316 | 1 Nr |
| 22 | 60161262 | Nut Hex M8 | Stainless Steel AISI 304/316 | 1 Nr |
| 23 | 60161080 | Upper Support for Carbon Bush | Cast Iron | 1 Nr |
| 24 | 60161105 | Upper Thrust Bearing | Brass | 1 Nr |
| 25 | 60101142 | Screw CSK M4 × 10 | Stainless Steel AISI 304 | 6 Nr |
| 26 | 60161020 | Carbon Bush | Carbon | 4 Nr |
| 27 | 60161042 | Gasket Top Piece | Tesnit (BA50) | 1 Nr |
| 28 | 60161315 | Upper Threaded Socket | Cast Iron / SS AISI 316 | 1 Nr |
| 29 | 60161215 | O-Ring 165 × 2.5 | NBR | 2 Nr |
| 30A | 60101197 | Motor Cable Tail 1 × 12 mm² (earthing) | Cu + XLPE + PVC | 5 Mtr |
| 30B | 60161185 | Motor Tail Cable 1 × 10 / 16 / 25 / 35 mm² | Copper + Rubber | 15 Mtr |
| 31 | 60161594 | Flange (200-140-46) | Stainless Steel AISI 304/316 | 2 Nr |
| 32 | 601616XX | Stator Stack (Assembly) | Silicon Steel (B50-A800) | 1 Set |
| 33 | 601063XX | Rotor Shaft | Stainless Steel AISI 431 | 1 Nr |
| 34 | 60161660 | Rotor Lamination (incl. shaft, copper bars, end ring) | Silicon Steel + Stainless Steel + Copper | 1 Set |
| 35 | 60101145 | Key for End Shaft | Stainless Steel | 1 Nr |
| 36 | 60161320 | Lower Bearing Housing | Cast Iron | 1 Nr |
| 37 | 60161280K | Thrust Bearing | Stainless Steel / Carbon | 1 Set |
| 38 | 60161040 | Gasket Thrust Support | Tesnit (BA50) | 1 Nr |
| 39 | 60161070 | Thrust Support | Cast Iron / SS AISI 316 | 1 Nr |
| 40 | 60161260 | Bolt Allen M10 × 190 | Stainless Steel AISI 304/316 | 6 Nr |
| 41 | 60161000 | Adjustment Bolt | Stainless Steel AISI 431/316 | 1 Nr |
| 42 | 60161010 | Lock Washer, Adjustment Bolt | MS | 1 Nr |
| 43 | 60101045 | Diaphragm Rubber | NBR | 1 Nr |
| 44 | 60161130 | Diaphragm Support | Cast Iron / SS AISI 316 | 1 Nr |
| 45 | 60161037 | Bottom Plate | Cast Iron / SS AISI 316 | 1 Nr |
Downloads
Technical documents.
Pairs well with
Complete the pump-set.
PumpFX Series
Cast-iron mixed-flow pumps for 8–12″ wells.
Up to 504 m³/h · 552 m
PumpKPS Series
Fabricated stainless for corrosive water.
Up to 228 m³/h · 567 m
AccessoryPT100 Sensor
Real-time winding temperature to your panel.
Fits KM6 · KM8 · KM10
10″KM10 Series
Need more than 200 HP? Step up to 10″.
40–270 HP · 2/4-poleRequest a quote
Quote a KM8 for your project.
Pick the model, or just give us flow and head. An application engineer will reply with a selection, lead time and pricing, normally within one working day.