The Honda 90107-959-003 Flange Bolt (8X25) is a genuine OEM fastener designed for GX340 and GX390 horizontal shaft engines and HR17 lawn mowers. As a direct Honda OEM part, this bolt carries the exact dimensions and thread specification Honda engineers called out for these applications. Verify your machine's serial number against the fitment table to confirm part number 90107-959-003 is correct for your specific unit before ordering.
Key Features
- Genuine Honda OEM — sourced directly from Honda, this fastener meets the same specification as the original bolt installed at the factory, so you are not guessing on thread pitch or head geometry
- Exact Dimensional Match — the 8 mm diameter and 25 mm length are fixed parameters; using an undersized or oversized substitute risks stripped threads or inadequate clamping
- Broad Application Coverage — listed for GX340 and GX390 horizontal shaft engines as well as HR17 lawn mowers, covering a range of Honda commercial and residential equipment
- Check Your Serial Number — Honda updates fastener specifications across production runs, so confirm your machine's serial number matches the fitment table before ordering
A flange bolt combines a standard hex bolt with an integrated flanged washer beneath the head, distributing clamping load over a wider area than a plain bolt alone. This design reduces the risk of fastener loosening under vibration — a common operating condition in small engines and walk-behind mowers. A missing or damaged bolt of the correct specification can allow the clamped components to shift or work loose during operation, so replacing it with the correct OEM part maintains the integrity of the assembly.
Part Details
| Part Number | 90107-959-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Flange Bolt (8X25) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX340, GX390 | All |
| Lawn Mower | HR17 | 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.
