Multiquip EM23802 Hex Flange Nut M8-1.25 Serrated

The Multiquip EM23802 is a genuine OEM Hex Flange Nut M8-1.25 Serrated designed for a wide range of Multiquip and Mayco concrete pumps and ride-on power trowels. This fastener is sourced directly from Multiquip, ensuring it meets the exact material and dimensional specifications of the original hardware used at the factory. Confirmed fitment spans C30HD, C30HDG, C30HDZ, C30HDN, C30HDNI, LS-40, LS40D, LS40TD, LS50TD, LS60TD, LS300, LS400, LS500, LS600, ST-45HRM, MD80, MD82, MD105, LD6, LD6SL, LD60, STX6H, STXDF, HTX6H, PRX, EHHNK5, HHXDF4, and HHXDF5 equipment. Keeping the correct OEM fastener on hand prevents fitment issues and ensures structural connections stay tight through heavy operational loads.

Key Features

• Genuine OEM Fastener Grade — Manufactured to Multiquip's original torque and clamping specifications, so the serrated flange seats and locks exactly as the assembly requires.
• Serrated Flange Locking Design — The integrated serrated flange bites into the mating surface to resist vibration-induced loosening, a critical function on high-cycle pump and trowel equipment.
• Broad Cross-Equipment Fitment — Covers C30HD-series Mayco concrete pumps, LS-series hydraulic concrete pumps, and multiple ride-on trowel platforms including MD, LD, STX, HTX, PRX, and HHX models.
• Direct Drop-In Hardware — M8-1.25 thread pitch and flange diameter match the original fastener position — no chasing threads or shimming required for installation.
• Structural Connection Integrity — A worn, stripped, or incorrect nut on pump or trowel assemblies can allow component movement and accelerated wear; the correct OEM fastener maintains clamping load across service intervals.

A hex flange nut combines a standard hex nut with an integrated wide flange that acts as a built-in washer, distributing clamping load over a larger surface area and reducing the risk of pull-through on the mating material. The serrated underside of the flange digs into the fastened surface under torque, creating a mechanical lock that resists loosening caused by vibration and cyclical loading — both of which are constant factors on concrete pumps and ride-on trowels. When a flange nut becomes stripped, corroded, or is replaced with an incorrect substitute, clamping force drops, connections work loose, and surrounding components can shift or sustain damage during operation.

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.