The Honda 90231-KCS-651 Lock Nut (16MM) is a genuine OEM fastener designed for Honda H3011 riding mowers, H4013, H5013, H5518, and RT5000 multi-purpose and lawn tractors. As a direct Honda OEM component, this lock nut is manufactured to the exact specifications required for these machines, ensuring a proper, secure fit with no guesswork. Honda supersedes fasteners at serial breaks, so confirm your machine's serial number against the fitment table before ordering.
Key Features
- Genuine Honda OEM Fastener — sourced directly from Honda, this lock nut meets the exact dimensional and holding specifications Honda engineers specified for these tractors and mowers.
- 16MM Locking Design — the locking feature resists loosening under vibration and load, maintaining joint integrity during operation across varied terrain.
- Broad Tractor and Mower Fitment — listed for Honda H3011, H4013, H5013, H5518, and RT5000 machines; verify your serial number against the compatibility table to confirm the correct application for your unit.
A lock nut differs from a standard hex nut in that it incorporates a mechanism — typically a distorted thread or nylon insert — that resists self-loosening caused by vibration and dynamic loads during machine operation. On riding mowers and multi-purpose tractors like these Honda models, fasteners are subjected to constant vibration from the engine and drivetrain, as well as the shock loads of uneven terrain. When a lock nut backs off or fails, the joint it secures can shift or separate, affecting the reliability of the assembly it holds. Replacing a worn or missing lock nut with the correct Honda OEM part number 90231-KCS-651 restores the holding force the connection was designed to carry.
Part Details
| Part Number | 90231-KCS-651 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Lock Nut (16MM) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Lawn Tractor | H4013 | All |
| Multi-Purpose Tractor | H5013, H5518, RT5000 | All |
| Riding Mower | H3011 | 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.
