The Multiquip 2025111 Hex Nut 5/16"-18 UNC is a genuine OEM fastener designed for MQ and STOW diaphragm pump models including MQ-D206H, MQ-D305, D306, MQ-D306HA, SDP-2, and SDP-3. As a direct OEM replacement, this nut is manufactured to the exact thread specification and dimensional tolerances required for correct assembly and secure clamping on the pump. Sourced directly through Multiquip's authorized parts network, the part ensures you are installing the correct hardware every time. DHS Equipment stocks this genuine OEM component and is ready to ship to keep your diaphragm pumps back in service.
Key Features
- Correct Thread Specification — 5/16"-18 UNC thread form matches the original fastener spec, ensuring full thread engagement and proper torque retention on pump assemblies.
- Genuine OEM Hardware — Manufactured to Multiquip's original material and dimensional standards, delivering the same clamping integrity as the hardware your pump shipped with.
- Broad Diaphragm Pump Fitment — Confirmed fit for MQ-D206H, MQ-D305, D306, MQ-D306HA, SDP-2, and SDP-3 diaphragm pump models.
- Drop-In Installation — Matches the original fastener profile exactly, so it seats and torques correctly without any modification to existing hardware or mating components.
- Maintains Pump Integrity — Using the correct-spec nut prevents loosening under vibration and pressure cycles, protecting sealing surfaces and critical pump components from damage caused by improper fasteners.
A hex nut is a threaded fastener used to clamp and secure components together on a bolted joint. On diaphragm pumps, fasteners like the 5/16"-18 UNC hex nut are used throughout the pump housing, diaphragm plate, and valve assemblies to maintain proper sealing pressure and structural integrity. Using an incorrect or worn nut can result in loose joints, fluid leaks, or damaged mating surfaces — making it important to replace fasteners with the correct OEM-spec hardware whenever the pump is serviced or rebuilt.
Part Details
| Part Number | 2025111 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Hex Nut 5/16"-18 UNC |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Diaphragm Pumps | MQ-D206H |
| MQ Diaphragm Pumps | MQ-D305 |
| MQ Diaphragm Pumps | D306 |
| MQ Diaphragm Pumps | MQ-D306HA |
| STOW Diaphragm Pumps | SDP-2 |
| STOW Diaphragm Pumps | SDP-3 |
| STOW Diaphragm Pumps | CA90749 |
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.
