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Baker Submersible Motors
A.Y. McDonald Submersible Motor Adapter Stainless Steel
A.Y. McDonald
A.Y. McDonald Submersible Motor Adapter Stainless Steel
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- From $476.84
A.Y. McDonald 6 in Submersible Pump Lead 3 Wire w/Ground
A.Y. McDonald
A.Y. McDonald 6 in Submersible Pump Lead 3 Wire w/Ground
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- $230.53
A.Y. McDonald 4 in Submersible Pump Leads
A.Y. McDonald
A.Y. McDonald 4 in Submersible Pump Leads
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A.Y. McDonald 10 in Submersible Motor - Water Well, 60 Hz
A.Y. McDonald
A.Y. McDonald 10 in Submersible Motor - Water Well, 60 Hz
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A.Y. McDonald 8 in Submersible Motor - Stainless Steel Ends, 60 Hz
A.Y. McDonald
A.Y. McDonald 8 in Submersible Motor - Stainless Steel Ends, 60 Hz
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A.Y. McDonald 8 in Submersible Motor - Cast Iron Ends, 60 Hz
A.Y. McDonald
A.Y. McDonald 8 in Submersible Motor - Cast Iron Ends, 60 Hz
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- From $5,389.97
A.Y. McDonald 7 in Submersible Motor - Stainless Steel Ends, 60 Hz
A.Y. McDonald
A.Y. McDonald 7 in Submersible Motor - Stainless Steel Ends, 60 Hz
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- From $5,183.77
A.Y. McDonald 7 in Submersible Motor - Cast Iron Ends, 60 Hz
A.Y. McDonald
A.Y. McDonald 7 in Submersible Motor - Cast Iron Ends, 60 Hz
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- From $5,331.71
A.Y. McDonald 6 in Three-Phase Submersible Motor - Water Well, 60 Hz
A.Y. McDonald
A.Y. McDonald 6 in Three-Phase Submersible Motor - Water Well, 60 Hz
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- From $1,952.66
A.Y. McDonald 6 in Single-Phase Submersible Motor - Water Well, 3-Wire, 60 Hz
A.Y. McDonald
A.Y. McDonald 6 in Single-Phase Submersible Motor - Water Well, 3-Wire, 60 Hz
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- From $2,560.38
A.Y. McDonald 4 in Submersible Motor - Water Well, Stainless Steel, 60 Hz
A.Y. McDonald
A.Y. McDonald 4 in Submersible Motor - Water Well, Stainless Steel, 60 Hz
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- From $540.54
Baker Submersible Motors
A.Y. McDonald · Pumps by Baker · Submersible Motors
Baker Submersible Motors
The power half of every submersible system: sealed, water-cooled and stainless where it counts. Baker submersible motors run from 1/2 HP residential two-wire units to 250 HP municipal motors across 4, 6, 7, 8 and 10 in frames, on NEMA flanges that mate with Baker pump ends and other NEMA-standard hydraulics of matching horsepower.
1/2–250 HPFive Frame Sizes
4–10 inMotor Frames
2W · 3W · 3Ph115, 230, 460, 575V
3 YearsMotor Warranty from Manufacture
A Baker submersible motor drives a pump end of the same horsepower: to replace a failed motor under a healthy pump end, or to build a new set with a Baker pump end and its control. Two-wire motors carry their capacitor on the motor and need no control box; three-wire single-phase motors need a control box, and three-phase motors a starter.
We supply the full Baker motor line and confirm the horsepower, voltage, frame and required control before anything ships. Call 1-888.510.4036 or email sales@watermainsupply.com. Genuine A.Y. McDonald equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier. Watermain Supply is an Authorized Stocking A.Y. McDonald and Baker Water Systems Distributor.
Will It Work for Me?
The four questions to settle before ordering a motor, answered from A.Y. McDonald literature.
Warranty
Baker submersible motors: 3 years from the date of manufacture. A.Y. McDonald’s terms add a 5-year term in potable water applications for motors including assembled pumps with pump ends up to 25 GPM.
Reliability
Two-pole asynchronous motors with a squirrel-cage rotor on a self-centering Kingsbury-type thrust bearing, cooled and lubricated by water and glycol. 4 in motors are IP68, insulation class F and CSA certified.
Fit
Match horsepower, voltage and phase to the pump end and the service. Cooling flow past the motor: 1.0 ft/sec on 4 and 6 in (rated to 95°F and 85°F water); 0.66 to 1.64 ft/sec on 7 to 10 in. Maximum operating depth 984 ft.
Size It Now
Send the pump end model, available voltage and phase, and casing size. Submersible calculator · 1-888.510.4036 · Email sales
The Baker Motor Line
Three groups by frame. Detail follows the cards.
4 in Motors
Residential to Light Commercial
HP1/2–10
Wiring2W, 3W, 3Ph
Volts115–575V
FlangeNEMA 4 in
Every 4 in configuration on one listing: two-wire, three-wire single-phase and three-phase.
- 2-wire: 1/2 HP at 115V; 1/2–1 1/2 HP at 230V
- 3-wire single-phase: 1/2–5 HP (115V at 1/2 HP)
- 3-phase: 230, 460 and 575V, to 10 HP
Best for domestic wells and 4 in pump ends
View 4 in Motors
6 in Motors
Single- and Three-Phase
HP5–60
1Ph7 1/2–15 HP
3Ph230/460/575V
FlangeNEMA 6 in
AISI 304L stainless sleeves with painted cast iron brackets, a Duplex stainless shaft end and a removable cable connector. Suitable for a VFD at 60 Hz.
- Single-phase 3-wire, 230V, 7 1/2–15 HP, with the 6 in Deluxe control box
- Three-phase, 5–60 HP, with a starter kit
- Overload protection provided by the user
Best for irrigation and small municipal wells
View 6 in Three-Phase
7, 8 and 10 in Motors
Rewindable, 460V Three-Phase
HP30–250
Volts460V 3Ph
EndsCast iron or SS
Pressure425 PSI max
Rewindable motors with a copper, PVC-insulated stator in an AISI 304 shell, a Kingsbury-type thrust bearing with graphite pads, and a ceramic and carbon mechanical seal.
- 7 in: 30–75 HP; 8 in: 40–150 HP; cast iron or stainless steel ends
- 10 in: 125–250 HP
- Overload protection provided by the user
Best for municipal and industrial wells with big-bore pump ends
View 8 in Stainless Ends
4 in Submersible Motors
Two-pole asynchronous design: a squirrel-cage rotor on a self-centering thrust bearing cooled and lubricated by a water-and-glycol mix, with the stator sealed in an airtight stainless steel can. Two-wire motors use AISI 304 stainless on the parts in contact with water and carry the capacitor in a Noryl cartridge on the motor, so they need no control box. Three-wire and three-phase motors use AISI 316 stainless. NEMA 4 in flange, IP68, insulation class F, CSA certified, rated to 95°F water, up to 20 starts per hour.
| Design | Asynchronous, two-pole, squirrel-cage rotor |
| Parts in contact with water | AISI 304 (two-wire); AISI 316 (three-wire and three-phase) |
| Stator housing | Airtight stainless steel can |
| Thrust bearing | Self-centering Kingsbury-type; water and glycol cooled and lubricated |
| Two-wire starting | Capacitor in a Noryl cartridge on the motor; no control box |
| Ratings | Insulation class F; IP68; CSA certified |
| Cooling flow / temperature | 1.0 ft/sec past the motor at 95°F |
| Starts / depth / voltage tolerance | 20 per hour / 984 ft / +6% to -10% |
6, 7, 8 and 10 in Submersible Motors
Above the 4 in frame, horsepower climbs to 250 and three-phase becomes the rule, with one single-phase exception for 7 1/2 to 15 HP on single-phase service.
| Frame | Configuration | HP | Voltage | Notes |
|---|---|---|---|---|
| 6 in | Three-wire single-phase | 7 1/2–15 | 230V | Pairs with the 6 in Deluxe control box |
| 6 in | Three-phase | 5–60 | 230/460/575V | Starter kit required; 25 starts per hour |
| 7 in | Three-phase, cast iron ends | 30–75 | 460V | NEMA 6 in flange |
| 7 in | Three-phase, stainless ends | 30–75 | 460V | Corrosion-resistant option |
| 8 in | Three-phase, cast iron ends | 40–150 | 460V | NEMA 8 in flange |
| 8 in | Three-phase, stainless ends | 40–150 | 460V | Corrosion-resistant option |
| 10 in | Three-phase | 125–250 | 460V | Pairs with pump ends to 1100 GPM |
Cast iron vs stainless ends, chemistry decides: on the 7 and 8 in frames, cast iron ends suit neutral groundwater; stainless earns its premium where chlorides, low pH or other aggressive chemistry appear. On a motor set hundreds of feet down, the difference is small insurance against an early pull. Send a water analysis with the RFQ.
Every large motor is a matched-set quote: the frame must fit the casing, the horsepower must match the pump end, and the starter must suit the motor’s current and your voltage. We quote 6 to 10 in motors as engineered sets with the pump end and starter, with submittals for engineer-of-record review.
Motor Frame Comparison
| Feature | 4 in | 6 in | 7 in | 8 in | 10 in |
|---|---|---|---|---|---|
| HP range | 1/2–10 | 5–60 (3Ph); 7 1/2–15 (1Ph) | 30–75 | 40–150 | 125–250 |
| Single-phase | 2-wire and 3-wire | 3-wire, 7 1/2–15 HP | — | — | — |
| Three-phase voltages | 230/460/575V | 230/460/575V | 460V | 460V | 460V |
| Construction | Stainless (304 two-wire; 316 three-wire) | 304L sleeves, painted cast iron brackets | 304 shell; cast iron or stainless ends | 304 shell; cast iron or stainless ends | 304 shell, cast iron structure |
| Insulation class | F | F | Y (PVC rewindable) | Y (PVC rewindable) | Y (PVC rewindable) |
| Cooling flow | 1.0 ft/sec | 1.0 ft/sec | 0.66 ft/sec | 0.66–1.64 ft/sec | 1.64 ft/sec |
| Required control | None (2W); box (3W 1Ph); starter (3Ph) | Deluxe box (1Ph); starter (3Ph) | Starter kit | Starter kit | Starter kit |
Source: Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 121-128 and 185-197.
Quick rule: pump end horsepower sets the motor horsepower; the well casing sets the frame; the electrical service sets single- or three-phase and voltage. Then add the control from the table below.
Baker vs Other Submersible Motors We Supply
The closest equivalents on our site.
| Feature | Baker 4 in | DAB Tesla 4TW / 4GG | Baker 6 in | DAB Tesla 6GF |
|---|---|---|---|---|
| HP | 1/2–10 | 4TW 0.5–1.5; 4GG 0.5–5 (1Ph), 0.5–10 (3Ph) | 5–60 (3Ph); 7 1/2–15 (1Ph) | 5.5–60 (3Ph); 7.5–15 (1Ph) |
| Wetted stainless | 304 (2W); 316 (3W, 3Ph) | AISI 304 | 304L sleeves | AISI 304 and cast iron |
| Listings | CSA | NSF/ANSI 61 + 372, UL, CSA | — | — |
| Maximum depth | 984 ft | 984 ft | 984 ft | 984 ft |
Verdict: Baker’s 4 in three-wire and three-phase motors step up to AISI 316 wetted parts, and the Baker line runs to 250 HP across five frames, with matching Baker controls and pump ends. DAB Tesla wins where NSF/ANSI 61 and UL listings on the motor are required, and on a DAB S4 pump end.
Which Motor Does Your System Need?
| Your situation | Motor | Why |
|---|---|---|
| Standard residential well, simplest install | 4 in two-wire | 1/2–1 1/2 HP; capacitor on the motor, no control box |
| More horsepower, or starting parts you can service above ground | 4 in three-wire single-phase | 1/2–5 HP with a control box |
| Three-phase power at the site | 4 in three-phase | 230, 460 or 575V to 10 HP, with a starter kit |
| 6 in well, single-phase service, 7 1/2–15 HP | 6 in single-phase | 230V three-wire with the 6 in Deluxe control box |
| Irrigation or municipal duty | 6 in three-phase; 7, 8 or 10 in | 5 to 250 HP for the big-bore pump ends |
| Corrosive groundwater on a big motor | 7 or 8 in, stainless ends | Stainless end option; send a water analysis |
| Constant pressure on a 4 in motor | 4 in motor with AutoDRIVE | SD1 runs 2- or 3-wire motors to 2 HP; SD3 runs three-phase motors to 5 HP from single-phase power |
Every Motor Has a Required Control
| Motor | Control |
|---|---|
| Two-wire single-phase | None: the starting components are in the motor. A pressure switch and tank complete the system. |
| Three-wire single-phase | Control box matched to the motor: Standard capacitor-start to 1 HP; Standard capacitor start-run or Deluxe for 1 1/2–5 HP; 6 in Deluxe for 7 1/2–15 HP. |
| Three-phase | IEC starter kit with contactor and overload, coil voltage matched to your service (230, 460 or 575V). |
| Constant pressure | AutoDRIVE in place of the control box or starter, with a pressure switch or transducer: SD1 for 2- and 3-wire motors to 2 HP; SD3 for three-phase motors to 5 HP from a single-phase supply. |
The mismatch that kills motors: a control box with the wrong capacitors, or a starter with the wrong overload, protects nothing, and the failure shows up as a dead motor months later. Match nameplate to nameplate, or send us both and we confirm before shipping.
Key Terms Explained
2-Wire vs 3-Wire
Two-wire motors carry the starting capacitor on the motor and need no control box, to 1 1/2 HP. Three-wire motors keep the starting parts above ground in a control box, serviceable without pulling the pump, to 5 HP in the 4 in frame.
Phase and Voltage
Single-phase 115 or 230V is residential service; three-phase 230, 460 or 575V is commercial. 460V is the standard on the 7 to 10 in frames. Always match the nameplate to the service.
Sealed and Cooled
A water-and-glycol fill cools and lubricates the thrust bearing; well water flowing past the shell carries heat away. That is why the motor needs its minimum cooling flow, and why running dry destroys a submersible.
Insulation Class and IP68
Class F (4 and 6 in) is the winding temperature rating; the 7 to 10 in rewindable motors use PVC-insulated class Y windings. IP68 means sealed against dust and continuous submersion.
NEMA Flange
The industry-standard motor face and shaft coupling, so Baker motors mate with Baker and other NEMA-standard pump ends of matching horsepower. Send both nameplates to confirm.
Thrust
The thrust bearing carries the pump’s downward load. Each Baker listing gives the rated downward thrust per model, from 500 lbf on small 4 in motors to over 10,000 lbf on the 8 in.
Why Watermain Supply
Engineering-Led Matching
We confirm horsepower, voltage, frame and required control before anything ships.
Multi-Brand Honesty
We also supply DAB Tesla motors. If a Baker motor is not the right fit, we will say so.
Account Terms
Net terms for qualified drillers, pump contractors and municipalities.
Parts and Aftermarket
Control boxes, service parts, starter kits and pump ends for the same set.
Engineered Large-Motor Sets
6 to 10 in motors quoted with matched pump ends and starters, with submittals.
Houston and Gulf Coast Service
Based in Houston, serving drillers and pump contractors across the Gulf Coast and nationwide.
Common Questions
Two-wire or three-wire: which should I buy?
Through 1 1/2 HP you have the choice. Two-wire is the simplest install, with nothing above ground but the pressure switch, but a failed starting capacitor means pulling the motor. Three-wire puts the capacitors in a control box you can service at the surface. Above 1 1/2 HP, three-wire or three-phase is the only option.
How do I know what horsepower to order?
The pump end decides. Its stage count sets its horsepower, and the motor nameplate must match. Replacing a motor under an existing pump end, match the old motor’s horsepower, voltage and wiring exactly.
Will a Baker motor drive my existing non-Baker pump end?
In most cases, yes: Baker motors use the NEMA flange standard, so they mate with other NEMA-standard pump ends of matching horsepower. Send us both model numbers and we verify before it ships.
How does a sealed motor stay cool underwater?
Inside, a water-and-glycol fill cools and lubricates the thrust bearing. Outside, well water flowing past the shell to the pump intake carries heat away, which is why each motor has a minimum cooling flow (1.0 ft/sec on 4 and 6 in) and why running dry destroys it.
I need 10 HP but only have single-phase power. What are my options?
The 6 in single-phase motor covers 7 1/2 to 15 HP on 230V with the 6 in Deluxe control box. For three-phase motors to 5 HP, the AutoDRIVE SD3 runs them from a 230V single-phase supply, with constant pressure. Above 15 HP, three-phase utility service is the answer.
What do class F, IP68 and CSA mean?
Class F is the winding insulation temperature rating; IP68 means sealed against dust and continuous submersion; CSA is the third-party electrical safety certification on the 4 in motors.
When do stainless steel ends justify their cost?
When the water analysis shows chlorides, low pH, hydrogen sulfide or other aggressive chemistry. On a deep 7 or 8 in motor, the stainless premium is small against the cost of pulling a 40 to 150 HP string early. In neutral groundwater, cast iron is a rational choice.
My motor won’t start. Is it dead?
Often not. On three-wire systems, check the control box first: a failed starting capacitor gives the classic hum without a start. Then the relay and overloads. If the box checks out, megohm the windings and check lead-to-lead resistance before condemning the motor. We supply every Baker control box part.
Send Us the Nameplates
Pump end model, available voltage and phase, and casing size: we confirm the exact motor and its required control before anything ships.
Technical data on this page is taken from A.Y. McDonald product literature and is subject to change by the manufacturer. Confirm against the current installation manual before specifying.
A.Y. McDonald, Baker, Pumps by Baker, Baker Water Systems and AutoDRIVE are trademarks of A.Y. McDonald Mfg. Co.; Noryl, Kingsbury, DAB and Tesla are trademarks of their respective owners, used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.
A.Y. McDonald, Baker, Pumps by Baker, Baker Water Systems and AutoDRIVE are trademarks of A.Y. McDonald Mfg. Co.; Noryl, Kingsbury, DAB and Tesla are trademarks of their respective owners, used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.
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