The Genie 18503GT is a genuine OEM Large Flange Locking Nut, 5/16-18 built for a wide range of Genie aerial lifts and access equipment. As an OEM part sourced directly through Genie's supply chain, it meets the original dimensional and material specifications for the machines it was designed to serve. This nut fits GS scissor lifts, S and Z series boom lifts, GR and GRC vertical mast lifts, AWP and IWP personnel lifts, GTH telehandlers, and TZ trailer-mounted booms, among other Genie equipment families. Cross-reference part number 18503GT against your machine's parts manual to confirm it is the correct fastener for your specific application before ordering.
Key Features
- Genuine OEM Construction — Manufactured to Genie's original material grade and dimensional spec, ensuring the flange bearing surface.
- Locking Thread Design — The locking feature resists loosening under vibration and load cycling, keeping fastened joints secure through demanding daily operation.
- Large Flange Profile — The integrated flange distributes clamping load across a wider bearing area, reducing the risk of surface deformation on the mating component.
- 5/16-18 Thread Specification — A precise thread callout means this nut installs directly onto matching 5/16-18 fasteners with no rework or modification to the joint.
- Broad Fitment Coverage — A single part number spans GS scissor lifts, S and Z boom lifts, GR and GRC vertical mast lifts, AWP and IWP personnel lifts, GTH telehandlers, and TZ articulating trailer booms.
A locking flange nut combines a standard hex nut with a wide integrated flange and a locking element — either a nylon insert or a prevailing-torque profile — in a single fastener. The flange acts like a built-in washer, spreading the clamp load and eliminating the need for a separate flat washer in most installations. The locking feature prevents the nut from backing off under the vibration and dynamic loading common on aerial lifts and telehandlers during travel, lifting, and positioning cycles. A loose or missing nut at a structural or mechanical joint can allow components to shift, wear prematurely, or separate — making correct fastener replacement an important part of any inspection or repair.
Part Details
| Part Number | 18503GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Large Flange Locking Nut, 5/16-18 |
Compatibility & Fitment
| Name | Models |
|---|---|
| AWP Super Series | AWP Super Series |
| GR-12 | GR-12 |
| GR-15 | GR-15 |
| GR-20 | GR-20 |
| GRC-12 | GRC-12 |
| GS-2032 | GS-2032 |
| GS-2668 DC | GS-2668 DC |
| GS-2668 RT | GS-2668 RT |
| GS-3268 DC | GS-3268 DC |
| GS-3268 RT | GS-3268 RT |
| GS-3384 | GS-3384 |
| GS-4046 | GS-4046 |
| GTH-844 | GTH-844 |
| IWP Super Series | IWP Super Series |
| S-60 | S-60 |
| S-60 DC | S-60 DC |
| S-65 | S-65 |
| TZ-34/20 | TZ-34/20 |
| Z-30/20 N | Z-30/20 N |
| Z-33 DC Power | Z-33 DC Power |
| Z-34 IC | Z-34 IC |
| Z-34/22 IC | Z-34/22 IC |
| Z-45 DC | Z-45 DC |
| Z-45/22 | Z-45/22 |
| Z-45/25 IC | Z-45/25 IC |
| Z-51/30J | Z-51/30J |
| Z-60 DC | Z-60 DC |
| Z-60/34 | Z-60/34 |
| Z-60/37 DC | Z-60/37 DC |
| Z-80/60 | Z-80/60 |
| Z33/18 | Z33/18 |
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.
