In-stock parts
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In-stock parts
Order by 2PM MST
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2045 West Buckeye Road
Phoenix AZ 85009
United States
Coupling only — not a hydraulic adapter kit or motor.
The Franklin XS439 SAE B hydraulic shaft coupling, part 305462041, is a service component for XS3x4-9 water truck pumps. It connects the pump shaft in the SAE B hydraulic-fit arrangement; it is not the SAE C coupling.
The B-fit configuration uses a 13-tooth involute SAE B spline with 16/32-inch spline pitch and a 30-degree pressure angle. Match the hydraulic motor interface before ordering. This listing is for the coupling only, not a complete adapter assembly; the motor mount, coupling set-screw pack and adapter plate are separate service components.
| Feature | Benefit |
|---|---|
| SAE B hydraulic fit | Match the coupling to the B-fit drive arrangement rather than the C-fit version. |
| Coupling-only service part | Replace the coupling without ordering a complete hydraulic adapter assembly. |
| Specification | Detail |
|---|---|
| Manufacturer | Franklin Electric |
| Manufacturer part number | 305462041 |
| Pump family | XS439 / XS3x4-9 |
| Component | SAE B hydraulic shaft coupling |
| Hydraulic fit | SAE B |
| Spline form | Involute, 13 teeth, 16/32-inch pitch, 30-degree pressure angle |
| Material | Cast iron, ASTM-48 Class 30 |
| Check | What to confirm |
|---|---|
| Pump identity | Match the pump model and existing part number; do not select by appearance alone. |
| Motor interface | Verify SAE B fit; do not substitute for an SAE C coupling. |
| Package scope | Coupling only. Confirm any motor mount, set screws or adapter plate needed as separate items. |
| Existing assembly | Provide the pump model and hydraulic motor interface details when confirming fit. |
Need help confirming the correct SAE B hydraulic shaft coupling? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your pump model, existing part number or photos.
| Material | Cast Iron |
|---|---|
| Weight | 3.17 lb |