The Genie 18503GT is a genuine OEM Large Flange Locking Nut, 5/16-18, built for an exceptionally wide range of Genie aerial equipment. This hardware component delivers the exact thread engagement and flange geometry specified for the original assembly, covering Genie GS scissor lifts, S and Z series boom lifts, GTH telehandlers, light towers, and vertical mast and push-around lifts. As a genuine OEM part, the Large Flange Locking Nut, 5/16-18 meets the same material and dimensional standards as the hardware installed at the factory. Cross-reference part number 18503GT against your machine's parts manual to confirm the correct application before ordering.
Key Features
- Genuine OEM Hardware Grade — Manufactured to Genie's specified thread class and flange dimensions for the 5/16-18 fastener position, ensuring correct clamping load and locking retention where it counts.
- Integrated Locking Flange — The large bearing flange distributes load across a wider surface area while the locking element resists vibration-induced loosening, keeping fastened joints secure under dynamic operating conditions.
- Drop-In Replacement — Matches the original 5/16-18 thread specification exactly, so this nut installs directly into any existing 5/16-18 threaded position without reworking mating components.
- Broad Fleet Coverage — A single part number covers Genie GS scissor lifts, S and Z series boom lifts, QS and IWP mast lifts, AWP push-around lifts, GTH telehandlers, GR and GRC runabouts, and TML light towers — simplifying parts inventory across a mixed fleet.
- Structural Integrity Where It Matters — On aerial lifts and elevated work platforms, a properly torqued and locked fastener is critical to maintaining structural connections. A worn, stripped, or missing locking nut can compromise joint integrity and create unsafe operating conditions.
A large flange locking nut combines two functions in a single fastener: the oversized flange acts like a built-in washer, spreading clamping force over a larger contact area to prevent pull-through and surface damage, while the locking element — typically a nylon insert or deformed thread — resists loosening caused by vibration, shock loads, and repeated cycling. On mobile aerial equipment, where structural joints, platform components, and chassis hardware are subject to constant movement and vibration, maintaining the specified torque and locking integrity of each fastener is essential to safe operation. When a locking nut is stripped, corroded, or missing, the joint can work loose over time, potentially affecting the structural or mechanical connection it was designed to secure.
Part Details
| Part Number | 18503GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Large Flange Locking Nut, 5/16-18 |
Compatibility & Fitment
| Name | Model |
|---|---|
| TML-4000 | TML-4000 |
| TML-4000N | TML-4000N |
| AWP Super Series | AWP Super Series |
| GRC-12 | GRC-12 |
| QS-12R | QS-12R |
| QS-15R | QS-15R |
| QS-20R | QS-20R |
| QS-12W | QS-12W |
| QS-15W | QS-15W |
| QS-20W | QS-20W |
| IWP Super Series | IWP Super Series |
| GR-12 | GR-12 |
| GR-15 | GR-15 |
| GR-20 | GR-20 |
| S-80X | S-80X |
| S-80 | S-80 |
| S-85 | S-85 |
| S-60 | S-60 |
| S-65 | S-65 |
| S-60X | S-60X |
| S-60 XC | S-60 XC |
| S-60 HC | S-60 HC |
| S-60 TRAX | S-60 TRAX |
| S-65 TRAX | S-65 TRAX |
| S-40 | S-40 |
| S-45 | S-45 |
| S-60 FE Hybrid | S-60 FE Hybrid |
| S-60 DC | S-60 DC |
| S-60 FE | S-60 FE |
| S-85 XC FE | S-85 XC FE |
| S-85 XC E | S-85 XC E |
| GS-2669BE | GS-2669BE |
| GS-3369BE | GS-3369BE |
| GS-4069BE | GS-4069BE |
| GS-3384 | GS-3384 |
| GS-3390 | GS-3390 |
| GS-4390 | GS-4390 |
| GS-5390 | GS-5390 |
| GS-1530 | GS-1530 |
| GS-1532 | GS-1532 |
| GS-1930 | GS-1930 |
| GS-1932 | GS-1932 |
| GS-2046 | GS-2046 |
| GS-2646 | GS-2646 |
| GS-3246 | GS-3246 |
| GS-2669DC | GS-2669DC |
| GS-3369DC | GS-3369DC |
| GS-4069DC | GS-4069DC |
| GS-2032 | GS-2032 |
| GS-2632 | GS-2632 |
| GS-3232 | GS-3232 |
| GS-2669RT | GS-2669RT |
| GS-3369RT | GS-3369RT |
| GS-4069RT | GS-4069RT |
| GS-4046 | GS-4046 |
| GS-2646 AV | GS-2646 AV |
| GS-2646 AV35 | GS-2646 AV35 |
| GS-2668 RT | GS-2668 RT |
| GS-3268 RT | GS-3268 RT |
| GS-2668 DC | GS-2668 DC |
| GS-3268 DC | GS-3268 DC |
| GS-30 | GS-30 |
| GS-32 | GS-32 |
| GS-46 | GS-46 |
| GTH-844 | GTH-844 |
| TZ-34/20 | TZ-34/20 |
| Z-60/34 | Z-60/34 |
| Z-34/22 N | Z-34/22 N |
| Z-34/22 DC | Z-34/22 DC |
| Z-34/22 Bi-Energy | Z-34/22 Bi-Energy |
| Z-51/30J | Z-51/30J |
| Z-45/25 | Z-45/25 |
| Z-45/25J IC Power | Z-45/25J IC Power |
| Z-45/25J DC | Z-45/25J DC |
| Z-45/25J Bi-Energy | Z-45/25J Bi-Energy |
| Z-40/23N | Z-40/23N |
| Z-40/23N RJ | Z-40/23N RJ |
| Z33/18 | Z33/18 |
| Z-30/20 N | Z-30/20 N |
| Z-30/20N RJ | Z-30/20N RJ |
| Z-60/37 DC | Z-60/37 DC |
| Z-60/37 FE Hybrid | Z-60/37 FE Hybrid |
| Z-45/25 IC | Z-45/25 IC |
| Z-60 DC | Z-60 DC |
| Z-60 FE Hybrid | Z-60 FE Hybrid |
| Z-33 DC Power | Z-33 DC Power |
| Z-45 FE Hybrid | Z-45 FE Hybrid |
| Z-45 DC | Z-45 DC |
| Z-60 FE | Z-60 FE |
| Z-45/25J IC | Z-45/25J IC |
| Z-34/22 IC | Z-34/22 IC |
| Z-45/22 | Z-45/22 |
| Z-34 IC | Z-34 IC |
| Z-80/60 | Z-80/60 |
| Z-25/8 | Z-25/8 |
| Z-20/8 | Z-20/8 |
| Z-20/8N | Z-20/8N |
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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