UnitedBuilt U36-189SSMS 7/8-9 LH Impeller Lock Nut — UnitedBuilt Equipment Skip to content
Quality Water Truck Systems, Tanks & Parts Since 1947
Quality Water Truck Systems, Tanks & Parts Since 1947
Lock Nut 7/8 - 9 LH, Stainless Steel (PUMPBU36 - 189SS) - UnitedBuilt Equipment

Impeller Lock Nut, 7/8-9 LH, Stainless Steel, UnitedBuilt U36-189SSMS

SKU 0004379
Brand UnitedBuilt
Availability:
19 in stock | Available on backorder
$0.00 - $0.00
$0.00
$30.00
$30.00 - $30.00
$30.00

Product Images

Images are for representation only and may differ from the actual product.

Questions about this product?

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.

Technical specifications

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)

Matching pump and shaft assemblies

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.

Before ordering

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.