In-stock parts
Order by 2PM MST
In-stock parts
Order by 2PM MST
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2045 West Buckeye Road
Phoenix AZ 85009
United States
The UnitedBuilt U36-189SSMS impeller lock nut is a 7/8-9 left-hand-thread stainless steel replacement for the counterclockwise (CCW) M3Z pump configuration. It secures the impeller at the threaded end of the matching shaft assembly.
Thread direction is a critical ordering detail. Select this LH nut for the matching CCW assembly; a nut with the same nominal diameter but the opposite thread direction is not interchangeable. Confirm both the shaft thread and pump rotation before ordering.
| Specification | Detail |
|---|---|
| Manufacturer | UnitedBuilt |
| Current part number | U36-189SSMS |
| Catalog reference | U36-189SS |
| Thread | 7/8-9 LH |
| Material | Stainless steel |
| Pump rotation | Counterclockwise (CCW) |
| Application | Selection |
|---|---|
| M3ZRM rope-packing shaft kit | B80696MS; pump B66895MS |
| M3ZRMS mechanical-seal shaft kit | B80697MS; pump B68416MS |
This is the individual impeller nut, not a complete shaft kit. The impeller, shaft, sleeve, bearings, and retaining rings are separate components. If you are replacing more than the nut, check the existing assembly before deciding between individual service parts and a shaft kit.
| Check | What to confirm |
|---|---|
| Thread hand | 7/8-9 LH; do not select solely by outside appearance. |
| Pump configuration | Confirm the exact CCW pump and shaft-kit model. |
| Installation | Follow the pump service procedure; do not substitute an assumed tightening torque. |
Need help confirming the correct impeller nut? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your pump model, existing nut number, or photos of the shaft threads.
| Material | Stainless Steel |
|---|---|
| Weight | 0.2 lb |
| Rotation | Counter Clockwise (CCW) |