The Multiquip 3051421 is a genuine OEM Screw 1/4-20 UNC x1 designed for MQ and STOW diaphragm pump models including MQ-D206H, MQ-D306HA, MQ-D305, D306, SDP-2, SDP-3, and CA90749. As a factory-sourced fastener, it meets the exact thread specification and dimensional tolerances required for a secure, rattle-free assembly on these pump units. Sourced directly from Multiquip, this screw ensures you are installing the correct hardware rather than a mismatched substitute that can back out or strip under vibration. Confirm your model code against the fitment list before ordering to ensure a direct match.
Key Features
- Exact Thread Specification — 1/4-20 UNC x1 threading matches the original tapped holes in MQ and STOW diaphragm pump housings, seating flush and holding torque under continuous pump vibration.
- Genuine OEM Sourcing — Factory-original hardware built to the same material grade and dimensional standard as the screw it replaces, so thread engagement and clamp load remain correct.
- Broad Diaphragm Pump Fitment — Confirmed for MQ-D206H, MQ-D306HA, MQ-D305, D306, SDP-2, SDP-3, and CA90749, covering a wide range of Multiquip and STOW diaphragm pump configurations.
- Vibration-Resistant Assembly — Correct fastener sizing prevents the loosening and housing movement that can lead to leaks or misaligned pump components during extended operation.
- Fast Service Turnaround — A single small fastener can hold up a full pump rebuild; having the correct OEM screw on hand keeps service time short and the pump back in service quickly.
Fasteners like the 3051421 Screw 1/4-20 UNC x1 are structural elements within diaphragm pump assemblies, securing covers, housings, and internal components that must stay firmly in position during operation. A diaphragm pump generates repetitive pressure pulses with every stroke, and an incorrectly sized or worn fastener can work loose over time, allowing housing panels to shift or air to enter the system. Using the correct OEM thread specification ensures proper clamp load is maintained, protecting the pump's internal components and keeping discharge performance consistent across the full duty cycle.
Part Details
| Part Number | 3051421 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Screw 1/4-20 UNC x1 |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Diaphragm Pumps | MQ-D206H |
| MQ Diaphragm Pumps | MQ-D306HA |
| STOW Diaphragm Pumps | SDP-2 |
| MQ Diaphragm Pumps | MQ-D305 |
| MQ Diaphragm Pumps | D306 |
| 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.
