The Genie 1257899GT is a genuine OEM Flat Washer, 1.5, F436, HRD, ZAG designed for Genie GTH telehandlers and Z-45/25 articulating boom lifts. As a direct-from-Genie component, this washer is manufactured to the same specifications as the original hardware installed at the factory, ensuring a correct, confidence-inspiring fit every time. Cross-reference part number 1257899GT against your Genie parts manual to confirm application before ordering. Compatible models include the GTH-636, GTH-844, GTH-1056, GTH-1256, GTH-1044, GTH-1244, GTH-1544, Z-45/25, Z-45/25J DC, and Z-45/25J Bi-Energy.
Key Features
- Genuine OEM Grade Hardware — F436 structural-grade specification with a hard (HRD) zinc-alloy galvanized (ZAG) coating, matching the corrosion resistance and load-bearing rating of the original Genie hardware.
- Direct-Replacement Fit — Dimensioned to the same 1.5 series bearing surface as the factory-installed washer, seating flush against fastened joints with no rework or shimming.
- Broad Genie Fleet Coverage — A single part number covers multiple GTH telehandler configurations and Z-45/25 articulating boom variants, making it a practical stock item for mixed Genie fleets.
- Load Distribution Where It Counts — The enlarged bearing surface spreads clamp load across structural connections, protecting mating surfaces from fastener pull-through and maintaining joint integrity under working loads.
- Structural Joint Safety — On aerial lifts and telehandlers, fastener hardware at structural connections is load-bearing and safety-critical; using the correct F436-rated washer preserves the designed clamping force and joint integrity at elevated positions and rated capacities.
A flat washer serves as a bearing plate between a fastener head or nut and the surface being clamped. By spreading the clamping force over a wider area, it prevents the fastener from pulling through or damaging the material beneath it and helps maintain consistent bolt tension in structural and mechanical joints. On heavy equipment like telehandlers and articulating boom lifts — where joints are subject to vibration, dynamic loads, and repeated stress cycles — using a washer with the correct grade rating and surface finish is essential. A missing, undersized, or incorrect washer can allow a fastener to loosen prematurely or concentrate stress in ways that compromise the integrity of the assembly over time.
Part Details
| Part Number | 1257899GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Flat Washer, 1.5, F436, HRD, ZAG |
Compatibility & Fitment
| Name | Model |
|---|---|
| GTH-636 | GTH-636 |
| GTH-844 | GTH-844 |
| GTH-1056 | GTH-1056 |
| GTH-1256 | GTH-1256 |
| GTH-1044 | GTH-1044 |
| GTH-1244 | GTH-1244 |
| GTH-1544 | GTH-1544 |
| Z-45/25 | Z-45/25 |
| Z-45/25J DC | Z-45/25J DC |
| Z-45/25J Bi-Energy | Z-45/25J Bi-Energy |
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.
