The Multiquip EM757 Lock Washer M4 is a genuine OEM fastener component designed for ST4, ST41230, ST41460, ST6, ST61230, and ST61460 series submersible pumps. As a factory-sourced part, the EM757 is manufactured to the exact material and dimensional specification used in original assembly, ensuring a direct fit without guesswork. Multiquip's submersible pump lineup depends on properly tensioned hardware throughout, and the EM757 Lock Washer M4 plays a quiet but essential role in keeping critical fasteners secure under continuous vibration and submerged operating conditions. Verify your model code against the fitment list before ordering to confirm compatibility.
Key Features
- Genuine OEM Material Spec — Sourced directly from Multiquip, this lock washer meets the original hardness and spring-tension rating specified for M4 fastener applications on these pumps.
- Direct Assembly Fit — Sized precisely for M4 hardware positions used in original pump construction, seating flush without shimming or modification.
- Broad ST-Series Compatibility — Confirmed fitment across ST4, ST41230, ST41460, ST6, ST61230, and ST61460 submersible pump models.
- Vibration and Moisture Resistance — Lock washer geometry maintains clamping force on fasteners exposed to continuous motor vibration and submerged or wet environments where loosening is a real risk.
- Critical Hardware Integrity — A failed or missing lock washer allows fasteners to back out over time, potentially causing cover or component misalignment and accelerated wear on surrounding pump parts.
A lock washer is a thin, hardened ring placed under a fastener to prevent it from loosening due to vibration or dynamic loads. In a submersible pump, motors and impellers generate continuous vibration during operation, which can cause standard fasteners to back out over time. By biting into both the fastener and the mating surface, the lock washer maintains clamping force and keeps assemblies tight. When a lock washer is worn flat, cracked, or missing entirely, fasteners are left vulnerable to vibration-induced loosening, which can lead to component misalignment, fluid ingestion into sealed housings, or premature pump failure.
Fits: ST4 | ST41230 | ST41460 | ST6 | ST61230 | ST61460
DHS Equipment is an authorized Multiquip parts dealer. If you need help confirming fitment for part number EM757, contact our parts team for assistance.
Part Details
| Part Number | EM757 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Lock Washer M4 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Submersible Pumps | ST4 |
| Submersible Pumps | ST41230/ST41460 |
| Submersible Pumps | ST6 |
| 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.
