The Multiquip 2021420 is a genuine OEM Hex Screw 1/4"-20 UNC x 1-1/4" designed for STOW and MQ diaphragm pump models including SDP-2, SDP-3, CA90749, and MQ-D206H. As a direct OEM replacement, this fastener matches the original thread pitch, length, and head specification to ensure a secure, properly torqued connection in the exact mounting location it was engineered for. Sourced directly from Multiquip, the part is the correct part to specify when servicing or reassembling these diaphragm pump units. Keep one on hand as a service spare to avoid delays during routine pump maintenance or field repairs.
Key Features
- Exact Thread Specification — 1/4"-20 UNC x 1-1/4" thread form and length match the original fastener, ensuring proper clamp load and engagement depth on diaphragm pump housings and covers.
- Genuine OEM Quality — Manufactured to Multiquip's original fastener grade and material specification, delivering the correct hardness and tensile strength for pump assembly torque requirements.
- Confirmed Fitment — Verified for use on SDP-2, SDP-3, CA90749, and MQ-D206H diaphragm pump models across the STOW and MQ product lines.
- Pump Integrity Depends on It — A correctly specified fastener maintains housing alignment and gasket compression; an incorrect or worn screw can allow housing flex, fluid leaks, or premature seal failure.
- Smart Service Stock — Fasteners like this are commonly replaced during diaphragm or valve service intervals; having the correct OEM screw on hand keeps reassembly straightforward and prevents improvised substitutions.
The Hex Screw 1/4"-20 UNC x 1-1/4" is a structural fastener used to secure pump housing panels, valve covers, or access plates on diaphragm pump assemblies. Diaphragm pumps rely on consistent clamping force across mating surfaces to maintain a leak-free seal between the fluid chamber and the mechanical drive side of the pump. When a fastener is stripped, corroded, or torqued incorrectly, housing sections can shift under operating pressure, compromising the diaphragm seal and allowing fluid bypass or contamination ingress — both of which degrade pump output and accelerate internal wear.
Part Details
| Part Number | 2021420 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Hex Screw 1/4"-20 UNC x 1-1/4" |
Compatibility & Fitment
| Name | Model |
|---|---|
| STOW Diaphragm Pumps | SDP-2 |
| STOW Diaphragm Pumps | SDP-3 |
| STOW Diaphragm Pumps | CA90749 |
| MQ Diaphragm Pumps | MQ-D206H |
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.
