Honda 90355-427-770 Flange Nut (7MM)

The Honda 90355-427-770 Flange Nut (7MM) is a genuine OEM fastener designed for GX25 horizontal shaft engines, FG110 tillers, WX10 water pumps, HHT25 trimmers, and UMC425 trimmers. As a Honda OEM component, this flange nut is manufactured to the exact dimensions Honda specifies, ensuring a correct, rattle-free fit wherever it is used across these machines. Verify the part number 90355-427-770 against your machine's serial number and parts diagram before ordering, as Honda periodically updates fastener specifications at production breaks.

Key Features

• Genuine OEM Fastener — sourced directly from Honda, this flange nut meets the exact dimensional and torque specifications called out in Honda's service documentation for these applications.
• Integrated Flange Design — the built-in flange distributes clamping load evenly across the mating surface, eliminating the need for a separate washer and helping maintain consistent thread engagement.
• Broad Fitment — listed for the GX25 horizontal shaft engine, FG110 tiller, WX10 water pump, HHT25 trimmer, and UMC425 trimmer; confirm the application against your parts diagram to ensure this is the correct nut for your assembly.
• Serial Number Verification Recommended — Honda supersedes hardware at production breaks, so checking your machine's serial number against the fitment table is the surest way to confirm part number 90355-427-770 is correct for your unit.

A flange nut combines a standard hex nut with a wide, integrated washer-like flange at its base. When tightened, the flange spreads the clamping force over a larger area than a plain nut, reducing the chance of the fastener working loose under vibration — a common condition on small-engine equipment like tillers, trimmers, and pumps. When a flange nut is missing, stripped, or replaced with an incorrect fastener, the assembly it secures can loosen progressively, leading to misalignment or component 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.