The Genie 991940GT is a genuine OEM Nylock Nut, 5/16-18 built for Genie and Terex portable light towers, including the AL5000, AL5, AL5HT, AL5 with Vertical Mast, and RL4. As a factory-sourced part, it meets the exact thread specification and locking performance of the original hardware. Cross-reference part number 991940GT against your machine's parts manual to confirm it is the correct fastener for your application before ordering.
Key Features
- Genuine OEM Fastener Grade — sourced directly from Genie, this nut meets the original thread form and nylon insert specification for the 5/16-18 size.
- Exact Thread Match — the 5/16-18 thread callout ensures correct engagement with the mating stud or bolt without rework or modification.
- Nylon Insert Locking — the nylock collar resists loosening under vibration and repeated thermal cycling, keeping fastened assemblies secure over time.
- Broad Light Tower Compatibility — fits multiple Genie and Terex light tower models, including the AL5000, AL5, AL5HT, AL5 with Vertical Mast, and RL4.
- Direct OEM Replacement — replaces the original hardware position-for-position with no alterations needed to surrounding components.
A nylock nut is a standard fastener fitted with a nylon insert at the top of the thread. When the nut is driven onto a bolt or stud, the nylon deforms around the thread and creates resistance that prevents the nut from backing off due to vibration or movement. On light tower equipment, where mast sections, generator frames, and lighting assemblies are exposed to road vibration during towing and engine vibration during operation, a loose fastener can compromise structural integrity. Replacing a worn or missing nylock nut with the correct OEM part restores the intended clamping force and locking performance at that joint.
Part Details
| Part Number | 991940GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Nylock Nut, 5/16-18 |
Compatibility & Fitment
| Name | Models |
|---|---|
| AL5 | AL5 |
| AL5 with Vertical Mast | AL5 with Vertical Mast |
| AL5HT | AL5HT |
| AL5000 | AL5000 |
| RL4 | RL4 |
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.
