The Honda 90031-ZG8-000 Flange Bolt (8X22) is a genuine OEM fastener designed for GX640 horizontal shaft engines, H4518 lawn tractors, and H5518 multi-purpose tractors. As a factory-original component, this bolt is manufactured to Honda's exact specifications, giving you the correct thread form, shank length, and flange diameter for a proper fit. Sourced directly through Honda's OEM parts program, it is the same fastener used in original assembly — not an approximation. Confirm your machine's serial number against the fitment table before ordering, as Honda updates part numbers at specific serial breaks.
Key Features
- Genuine OEM Hardware — factory-original bolt manufactured to the exact dimensions Honda specifies for this application, ensuring correct clamping load and thread engagement
- Correct 8X22 Specification — the (8X22) designation identifies the thread diameter and shank length; match this to your existing fastener before ordering to confirm you have the right variant
- Broad Fitment — listed for GX640 horizontal shaft engines, H4518 lawn tractors, and H5518 multi-purpose tractors; verify your serial number against the fitment table to confirm applicability
- Drop-In Replacement — identical to the original bolt in every dimension, so this part installs without modification or adaptation to existing hardware
A flange bolt combines a standard hex bolt with an integrated flange that distributes clamping load across a wider surface area than a plain bolt head. This wider bearing surface helps secure components firmly without requiring a separate washer, reducing the risk of loosening under vibration. When an original flange bolt is lost, stripped, or damaged, replacing it with the correct OEM part restores proper clamping force and keeps the assembly secure during operation.
Part Details
| Part Number | 90031-ZG8-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Flange Bolt (8X22) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX640 | All |
| Lawn Tractor | H4518 | All |
| Multi-Purpose Tractor | H5518 | All |
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.
