The Multiquip APRD27812 Lock Nut 9/16"-20 SAE is a genuine OEM fastener designed for AP6 and AP8 series water pumps. As a direct OEM replacement, this lock nut is sourced to the original specification, ensuring correct thread engagement and holding force right out of the box. Verified fitment on AP6 and AP8 models means no guesswork when ordering a service fastener for your Multiquip pump.
Key Features
- Genuine OEM Thread Integrity — Manufactured to the original 9/16"-20 SAE thread specification, delivering the correct clamping torque for this pump assembly.
- Direct OEM Replacement — Replaces the original lock nut without additional machining or rework; installs in the same position as the factory fastener.
- Confirmed Fitment — Verified for Multiquip AP6 and AP8 water pumps; cross-reference APRD27812 before ordering to confirm application.
- Locking Retention Under Vibration — The lock nut design resists loosening during pump operation, maintaining joint integrity even under sustained vibration loads.
- Fuel and Fluid System Safety — Proper fastener torque and locking retention are critical on pump assemblies to prevent leaks and maintain safe operation.
A lock nut is a fastener engineered to resist self-loosening when exposed to vibration and dynamic loads — conditions that are constant in pump operation. Unlike a standard hex nut, a lock nut incorporates a locking feature that maintains clamping force over time, preventing joint failure that could lead to leaks, misalignment, or component separation. When a lock nut wears, strips, or loses its locking capability, the integrity of the entire assembly is at risk, making timely replacement with the correct OEM part essential.
For fitment questions or ordering assistance, contact DHS Equipment.
Part Details
| Part Number | APRD27812 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Lock Nut 9/16"-20 SAE |
Compatibility & Fitment
| Name | Model |
|---|---|
| Water Pumps | AP6 |
| Water Pumps | AP8 |
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.
