Multiquip 2021214 Screw 1/2" x 2-1/4" Hex HN

The Multiquip 2021214 Screw 1/2" x 2-1/4" Hex HN is a genuine OEM fastener designed for Multiquip and STOW diaphragm pump models including MQ Diaphragm Pumps, SDP-3, SDP-2, and CA90749. As a direct OEM replacement, this hex head screw is manufactured to the exact dimensions and thread specification required by these pump assemblies, ensuring a proper, secure fit with no guesswork. Sourced directly through Multiquip's authorized parts network, the part is the correct part for scheduled maintenance or component repair on supported diaphragm pump models. Keep critical fastener positions secured with the same hardware your pump was built with.

Key Features

• OEM-Spec Thread and Dimensional Accuracy — Manufactured to the exact 1/2" x 2-1/4" hex head specification, ensuring correct torque engagement and thread engagement depth for diaphragm pump assemblies.
• Drop-In Replacement Hardware — Matches the original fastener profile and hex nut (HN) configuration, so it installs directly into existing bolt positions without reworking surrounding components.
• Confirmed Fitment for Key Models — Verified for use on MQ Diaphragm Pumps, SDP-3, SDP-2, and CA90749 STOW Diaphragm Pumps.
• Structural Integrity at Critical Joints — A correctly spec'd fastener at pump housing and cover joints keeps fluid paths sealed under operating pressure; an incorrect or worn fastener risks loosening, leaks, or housing damage.
• Genuine OEM Traceability — Supplied as an authentic Multiquip OEM part under part number 2021214, ensuring you receive the same hardware used in original pump assembly.

Fasteners on a diaphragm pump do far more than hold panels together — they clamp pump housings, valve covers, and diaphragm retaining plates under repeated cyclic pressure. A hex head screw at these joints must maintain consistent clamping force to keep internal sealing surfaces properly compressed and fluid contained. When a fastener stretches, corrodes, or is replaced with an off-spec substitute, it can allow micro-movement between mating surfaces, leading to leaks, premature diaphragm wear, or housing damage that turns a simple hardware swap into a costly repair.

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.