Multiquip 3051213 Hex Screw 1/2"-13 UNC x 1-3/4"

The Multiquip 3051213 is a genuine OEM Hex Screw 1/2"-13 UNC x 1-3/4" designed for MQ and STOW diaphragm pump models including MQ-D206H, MQ-D306HA, MQ-D305, D306, SDP-2, and SDP-3. As a factory-sourced fastener, part 3051213 meets the exact thread specification and dimensional tolerance required for correct assembly and secure clamping on these pump platforms. Sourced directly through Multiquip's OEM supply chain, this screw ensures you are installing the correct hardware — not a generic substitute that may differ in thread class, grip length, or material grade. DHS Equipment stocks this part to keep your diaphragm pump back in service with the right component the first time.

Key Features

• Correct Thread Specification — Manufactured to 1/2"-13 UNC threading with a 1-3/4" grip length, matching the exact fastener class called out in Multiquip's assembly documentation.
• Genuine OEM Hardware — Factory-sourced fastener engineered to the same material grade and dimensional standard as the original screw, ensuring proper clamp load and sealing integrity on pump assemblies.
• Broad Diaphragm Pump Fitment — Confirmed fit across MQ-D206H, MQ-D306HA, MQ-D305, D306, SDP-2, and SDP-3 diaphragm pump models.
• Maintains Pump Integrity — A correctly torqued, properly sized fastener keeps pump housing joints sealed under operating pressure — an incorrect or worn fastener risks fluid leakage and pump failure.
• Direct Drop-In Replacement — Installs into existing threaded bores without modification, restoring the pump to its original assembled condition.

Hex screws like the 3051213 serve as structural fasteners that clamp pump housing sections, cover plates, and mating flanges together on diaphragm pumps. These fasteners must maintain consistent clamping force under vibration and fluid pressure — if a screw is the wrong thread pitch, grip length, or material grade, it can back out, strip, or fail to seat the mating surfaces correctly, leading to fluid leaks or housing damage. Using the correct OEM fastener ensures the assembly torques to specification and holds its integrity throughout the pump's service life.

Part Details

Compatibility & Fitment

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.