Century 1/2 HP Round Flange 56J Full Rate Motor - ST1052



Part # ST1052

By Century Motors

  5 Average  



Part # ST1052

Warranty 1 Year

Dimensions 11" L x 9" W x 6.5" D

Alternate Part #'s 110281, 14290, 15093, 164563, 177481, 18330, 184947, 1K045, 5KC33JN2513X, 82537, 90118563, 91721, B126, B136, B526, C1098, C48H2N109A2, C48H2N109A3, C48J2DA154, C48J2DB154, C48J2DB160A1, C48J2N102, C48J2N104, C48J2N105, C48J2N112, C48J2N116A1, C48J2N116A3, C48J2N116A7, C48J2N119, C48J2N121, C48J2N121A2, C48J2N122, C48J2N123, C48J2N125, C48J2N126, C48J2N130, C48J2N131B1, C48J2N131B3, C48J2N131C2, CT105C, EB126, JD50FL1, M542, S48H2N10, S48H2N102, S48H2N104, S48H2N113, S48H2N114, S48H2N120, S48H2N122, S48H2N122A3, S48H2N122A4, S48H2N122A5, ST1052, SW2556, V18330, 35-126-3020, AOS-60-5062, AOSST1052

Product Description

Voltage 115/230, Max Amps 115V = 11.0 230V = 5.5, Single Speed, Round Flange, RPM = 3450, Threaded Shaft, Frame = 56J Used on the following models: Hayward Max Flow, Hayward Super Pump, Hayward Super II, Hayward Northstar and Jacuzzi Magnum pumps.

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
0.5 HP ST1052 Replacement Pool Motor
0.5 HP
3450 RPM
115/230 V
11./5.5 amp
Service Factor:
Total HP:
0.8 HP
Stock #:
Overload Protector:
Dimension Letter:
10 - 5/8 in.
Commonly Used On:
Hayward Max Flow, Hayward Super Pump, Hayward Super II, Hayward Northstar and Jacuzzi Magnum
California Title 20 Compliant

?     Asked on 1/2/2022 by Grant

I am currently running B127, but bearings are going. Can I replace with this to reduce power consumption?

A  Answered on 1/3/2022 by InyoPools Product Specialist Craig C.

Hello Grant.  Technically the B127 can be replaced with the ST1052.  However, the B127 current draw is 6amp @ 230VAC, the ST1052 current draw is 5.5amp @230VAC, minimal savings would result.  Additionally, the pump would be dropping from 1.125 THP to 0.8THP with the change which could result in a shorter motor (ST1052) life span - the pump impeller is mated to the higher THP.  For a significant reduction in energy consumption, the Century Motor V-Green Variable Speed Motor model  ECM16CU would be the preferred selection.  Century V-Green ECM16CU   

?     Asked on 5/10/2021 by RICHARD MATASON

I need a replacement motor for a Hayward Superpump 1/2 HP motor, model 04812N184B1 (i think this is correct but it is very well worn so I cant be 100% sure) . There also is this number: SP1610Z1M on the faceplate. 115/230 volts, 1.10 kw, 18.6/9.3 amps,


A  Answered on 5/10/2021 by InyoPools Product Specialist Patrick P.

Hi Richard, Thanks for the photo! We are actually showing that your motor is 1-1/2 HP and NOT 1/2 HP you will require this UST1152 1.5 HP Replacement Motor and this Hayward Super Pump Tune Up Kit. We put together this Video on How to Replace a Pool Pump Motor which you may find helpful when you tackle this project. All of these items are in Stock Ready to Ship!

?     Asked on 8/15/2020 by

I need to replace the motor on a Hayward inground pool pump. Model Number C48l2n134b1

A  Answered on 10/29/2020 by InyoPools Product Specialist Hector F.

Hello, the correct single speed replacement motor for your motor model C48l2n134b1 is the UST1152, When replacing a pool motor we do suggest a Seal Kit. Could you send us a few photos of your pump so we can suggest the proper seal kit? If so then please take a wide shot of the complete pump to include the pipes going in and out of the pump. To supply photos simply click the reply link below and upload your photos. Once we get those photos we can make the proper recommendation for your seal kit.

?     Asked on 5/11/2020 by

We need a motor for a pump. We have a model #c48k2n143b3 motor # sp1600-z-1m Will this motor fit?

A  Answered on 5/11/2020 by InyoPools Product Specialist Patrick P.

This is NOT the correct motor. You will require this motor here UST1102 Replacement Pool Motor when replacing your motor you will need a seal kit. For us to suggest the proper seal kit could you send a photo of a wide shot of your complete pool pump to show the pipes going in and out of the pump? To supply this photo simply click the reply link below and upload your photo. Once we get this photo we can make the proper recommendation for the seal kit.

?     Asked on 3/21/2020 by bob

Hi i have a Jacuzzi pool pump motor A.O. SMITH Part 7-184949-22 (1.65) amps 8.0/16.0 Rpm 3450 serial BX10-14. it keeps kicking the breaker off. Do i need a new motor or a breaker.

A  Answered on 3/21/2020 by InyoPools Product Specialist Patrick P.

Hi Bob, Yes this is a sign that you do need a new motor. We show that this B129 Pool Motor would be the correct replacement motor.

?     Asked on 5/22/2018 by J

I have a Hayward super pump 3/4 hp need motor replaced l run pump 24-7 230 v which one do u recommend ?

A  Answered on 5/22/2018 by InyoPools Product Specialist Lennox H.

Hi, J. You can use this ST1052 or the UST1072 as a replacement for the Hayward Super Pump 3/4 HP. 

?     Asked on 7/16/2017 by gary

i have a century 2 speed 2 hp 1081 pool and spa motor now, sp1615z2msc I know 1 1/2 hp pump is enough for my pool will this motor replace mine size wise

A  Answered on 7/22/2017 by InyoPools Product Specialist Lennox H.

Hi, Gary. The correct replacement motor is the Century B977 Motor. This 1/2 hp motor may not provide enough water flow to turn over the water depending on your pools feet of head. 

?     Asked on 6/12/2017 by Don

I need a 1hp motor for a jacuzzi magnum 1000 . My pump has a lock ring on it.

A  Answered on 6/16/2017 by InyoPools Product Specialist Lennox H.

Hi, Dom. Based on the info I've gathered the Magnum 1000 uses a 50Hz motor which we do not sell. If that's not the case and it uses a 60Hz motor the UST1102 Motor would be the correct replacement. In order to confirm we'll need the motor info.

?     Asked on 4/13/2017 by Keenan

Is there a VFD you can recommend that can be wired to this 0.5hp motor?

A  Answered on 4/13/2017 by InyoPools Product Specialist Scott W.

Unfortunately, I am not aware of one for that low of horsepower. Not saying that they do not go lower, but the lowest I have seen them go is 1HP.

?     Asked on 6/11/2016 by rod

my timer got stuck on the clip and the motor kept trying to go off but couldn't so, did I burn out the motor or the bearing. It still hums when I turn the power on after I let it cool off but want pump water to the filter.

A  Answered on 6/11/2016 by InyoPools Product Specialist Alan M.

It is possible that the motor has burned out. You will need to remove the motor from the pump housing and test to see if the motor is still turning the impeller. If yes, try is out when connected to the pump to see if it will primp and circulate water. If it is not turning, it is time to get a new motor.

?     Asked on 1/19/2012 by Guest

I'm trying to replace the motor on my pool pump but all these numbers and abbreviations on the motor label are really confusing me. What do they mean?

A  Answered on 1/19/2012 by InyoPools Product Specialist Patrick P.

Replacing a pool pump motor is not as difficult as it seems. You can try looking here. If you need help figuring out what the information on your label means. If you are still having difficulty figuring it out you can call us at our toll free number or you can send us a photo of your motor label here.

?     Asked on 1/18/2012 by Guest

I'm trying to find a replacement motor for my pool pump but my model number doesn't match what you have listed as the model number. My model number begins with a C48 and yours begins with an SP. Please help.

A  Answered on 1/18/2012 by InyoPools Product Specialist Patrick P.

What we have listed on our chart pages is the pump model number. The model number you have will just identify the motor. If you look on the plastic housing on the pump there should be a sticker which will have the pump model number. You can usually find this by the discharge port on the pump. Once you locate it you can choose the correct replacement motor. Be certain to change the shaft seal and gaskets as needed. You can use our >How to guide if you need help. 

?     Asked on 1/12/2012 by Guest

Why should I purchase a Tune Up Kit?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

A Tune Up Kit includes all of the essential replacement seals and gaskets for the pump. The seals and gaskets should be replaced when installing a new motor on your pump. New seals will prevent the pump from leaking water or losing the prime. A Tune Up Kit will protect your motor and ensure that the pump is working efficiently.

?     Asked on 1/12/2012 by Guest

Why do I need to purchase a new shaft seal?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

We strongly recommend replacing the shaft seal. The purpose of a shaft seal is to prevent water from running down the shaft of the motor and into the motor housing. Water will damage the bearings and cause the motor to fail. A new shaft seal should be installed whenever a motor is replaced. The motor manufacturer can deny the warranty if the motor fails to due to water damage from a faulty shaft seal. To find your shaft seal you will need to visit our Pool Pump Parts Page or the Spa Pump Parts Page and select your make and model.

?     Asked on 1/11/2012 by Guest

What is Service Factor?

A  Answered on 1/11/2012 by InyoPools Product Specialist Patrick P.

Service Factor(SF) is a multiplier that when multiplied by the horsepower of the motor indicates the total permissible horsepower loading that may be carried when the motor is operating at rated voltage and frequency. The most important thing to remember when replacing a motor is that the replacement motor's horsepower times its service factor must be equal to or greater than the original motor's horsepower times its service factor. The Service Factor rating can be found on the motor label. See Step 4 of our How to Read a Pool Motor Label guide.


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