The Honda 90351-750-881 Hexagon Lock Nut (5/16-18) is a genuine OEM replacement designed for the HT3810 lawn tractor. Sourced directly from Honda, this lock nut matches the original specification installed at the factory, ensuring a secure, rattle-free connection wherever it is used on the tractor. Honda supersedes hardware at serial number breaks, so confirm your machine's serial number against the fitment table before ordering.
Key Features
- Genuine OEM Hardware — Honda part number 90351-750-881 is sourced directly from Honda, matching the original nut in thread pitch, across-flat dimensions, and locking action.
- 5/16-18 Thread — the UNC thread specification is the exact size used on the HT3810, so this nut threads on without modification or chasing.
- Lock Nut Design — the locking feature resists loosening under vibration, maintaining clamping force during operation of the HT3810 lawn tractor.
- Serial Number Awareness — Honda updates hardware specifications at production breaks; check your HT3810's serial number against the compatibility table to confirm this is the correct revision for your unit.
A hexagon lock nut is a standard fastener with an integrated locking element — typically a nylon insert or a prevailing-torque thread form — that prevents the nut from backing off under the vibration a lawn tractor generates during normal mowing. On equipment like the HT3810, fasteners at various mounting points are subject to constant low-frequency vibration that can gradually work a standard nut loose. A lock nut retains its clamping load even under those conditions, keeping the joint secure over extended service. When a lock nut wears, strips, or loses its locking properties, the joint it holds can work loose, leading to play, noise, or component separation.
Part Details
| Part Number | 90351-750-881 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Hexagon Lock Nut (5/16-18) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Lawn Tractor | HT3810 | 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.
