The Genie 62864GT is a genuine OEM External Tooth Lock Washer, 5/16 designed for Genie TZ and TMZ series trailer-mounted articulating boom lifts. As a factory-sourced component, this washer matches the exact geometry and hardness spec required by the original assembly, ensuring secure fastener engagement every time it is installed. This part is confirmed to fit the TZ-34/20, TZ-50, TZ-50/30, TMZ-17/10, TMZ-34/19, and TMZ-50/30.
Key Features
- Genuine OEM Hardness and Tooth Profile — Sourced directly from Genie, this washer delivers the tooth count, bite depth, and material temper required to resist loosening under the vibration loads typical of trailer boom operation.
- Direct-Fit 5/16 Sizing — The 5/16 bore drops straight onto the correct fastener without shimming or adjustment, maintaining proper clamp load across the joint.
- Broad TZ and TMZ Compatibility — A single part number covers the TZ-34/20, TZ-50, TZ-50/30, TMZ-17/10, TMZ-34/19, and TMZ-50/30, making it a practical stock item for fleets running multiple trailer boom models.
- Prevents Fastener Back-Out — The external serrations bite into both the fastener face and the mating surface, locking the assembly against vibration-induced loosening that can otherwise cause fastener loss over time.
- Critical to Structural and Mechanical Joint Integrity — On aerial equipment, fasteners in boom, chassis, and turntable assemblies are load-bearing. Using the correct lock washer maintains the clamping force these joints depend on for safe operation.
An external tooth lock washer works by pressing hardened serrations into the bearing face of a fastener and the clamped material simultaneously, creating a mechanical grip that resists rotation. This grip is essential on machines exposed to continuous vibration and dynamic loading — conditions common to trailer-mounted boom lifts that are towed between jobsites and cycled repeatedly in the field. When a lock washer is missing, worn flat, or the wrong size, the fastener can back out gradually, compromising joint clamping force and potentially leading to play or movement in assemblies where none is acceptable. Replacing a damaged or lost washer with the correct Genie 62864GT restores the joint to its original specification.
Part Details
| Part Number | 62864GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | External Tooth Lock Washer, 5/16 |
Compatibility & Fitment
| Name | Model |
|---|---|
| TZ-34/20 | TZ-34/20 |
| TZ-50/30 | TZ-50/30 |
| TZ-50 | TZ-50 |
| TMZ-34/19 | TMZ-34/19 |
| TMZ-50/30 | TMZ-50/30 |
| TMZ-17/10 | TMZ-17/10 |
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.
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Husqvarna 505686301 Countersunk External Tooth Lock Washer 5/16
