The Multiquip 757300004 is a genuine OEM Lock Washer M4 designed for ST4, ST6, ST41230, ST41460, ST61230, and ST61460 submersible pumps. As a direct Multiquip OEM component, it is manufactured to the exact specification required for proper fastener retention in these units. This washer is a straightforward service item — having the correct part on hand keeps pump maintenance on schedule and fasteners secured to spec.
Key Features
- Genuine OEM Material Grade — Produced to Multiquip's specified hardness and dimensional tolerancing for an M4 lock washer, ensuring consistent clamping load and bite under torque.
- Drop-In Installation — Seats directly onto M4 fastener positions as originally assembled, requiring no modification to the pump housing or hardware.
- Broad Submersible Pump Fitment — Confirmed fit for ST4, ST6, ST41230, ST41460, ST61230, and ST61460 Multiquip submersible pump models.
- Prevents Fastener Back-Off — The locking geometry bites into both the fastener face and the mating surface, resisting vibration-induced loosening during pump operation.
- Critical in Submerged Environments — A failed or missing lock washer in a submersible pump application can allow fasteners to work loose under continuous vibration, risking seal failure and water ingress into the motor housing.
A lock washer is a small but essential fastening component that sits between a bolt or nut and the surface it clamps. Its spring tension and serrated or split profile bite into the fastener and the mating surface, resisting the rotational loosening that vibration causes over time. In a submersible pump, where the motor and impeller assembly run continuously in a submerged environment, any fastener that works loose can compromise housing integrity, leading to water ingress, seal damage, or motor failure. Replacing worn or missing lock washers during routine pump service is a low-cost step that protects far more expensive components downstream.
Part Details
| Part Number | 757300004 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Lock Washer M4 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Submersible Pumps | ST6 |
| Submersible Pumps | ST4 |
| Submersible Pumps | ST41230/ST41460 |
| Submersible Pumps | ST61230/ST61460 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
