The Genie 6638GT is a genuine OEM Flat Washer, USS, 1/4 built for a wide range of Genie equipment, including GS scissor lifts, S and SX telescopic boom lifts, Z and ZX articulating boom lifts, GTH telehandlers, AL and RL light towers, and Genie material and personnel lifts. As a genuine OEM part, it is manufactured to the same specifications as the original hardware installed at the factory. Cross-reference part number 6638GT against your machine's parts manual to confirm it is the correct washer for your application before ordering.
Key Features
- Genuine OEM Hardware — Manufactured to Genie's original dimensional and material specifications, ensuring the correct bearing surface and load distribution for the fastener assembly it supports.
- USS Standard Sizing — The USS (United States Standard) series designation means a wider outer diameter relative to the bolt size, providing greater surface coverage and load spread compared to a SAE washer of the same nominal size.
- Direct Replacement Fit — Matches the original 1/4 hardware used on the machine, dropping in without modification and mating correctly with existing fasteners.
- Broad Equipment Compatibility — Fits across multiple Genie equipment families, including GS scissor lifts, S and Z boom lifts, GTH telehandlers, AL and RL light towers, and Genie personnel and material lifts.
- Corrosion and Wear Resistance — Flat washers in this class are built to resist the wear and surface damage that can loosen fastener assemblies and lead to structural play over time.
A flat washer distributes the clamping load of a bolt or nut across a wider surface area, protecting the material being fastened from damage and preventing the fastener from pulling through or deforming softer substrates. On Genie aerial lifts, telehandlers, and related equipment, flat washers appear throughout the machine in structural, panel, and component-mounting assemblies. A missing, deformed, or incorrect washer can allow fasteners to loosen under vibration, leading to unwanted movement or wear at critical connection points. Replacing worn or damaged hardware with the correct OEM washer keeps fastener assemblies properly loaded and secure.
Part Details
| Part Number | 6638GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Flat Washer, USS, 1/4 |
Compatibility & Fitment
| Name | Models |
|---|---|
| AL4 | AL4 |
| AL4L | AL4L |
| AL5 | AL5 |
| AL5HT | AL5HT |
| AL5L | AL5L |
| AL4000 | AL4000 |
| AL5000 | AL5000 |
| AWP | AWP |
| AWP Super | AWP Super |
| AWP Super Series | AWP Super Series |
| CWP Super Series | CWP Super Series |
| DPL | DPL |
| Genie Hoist | Genie Hoist |
| Genie Lift | Genie Lift |
| Genie Powered Superlift | Genie Powered Superlift |
| Genie Tower | Genie Tower |
| Genie Winches | Genie Winches |
| GR-12 | GR-12 |
| GR-15 | GR-15 |
| GR-20 | GR-20 |
| GRC-12 | GRC-12 |
| GS-30 | GS-30 |
| GS-32 | GS-32 |
| GS-46 | GS-46 |
| GS-1530 | GS-1530 |
| GS-1532 | GS-1532 |
| GS-1930 | GS-1930 |
| GS-1932 | GS-1932 |
| GS-2032 | GS-2032 |
| GS-2046 | GS-2046 |
| GS-2632 | GS-2632 |
| GS-2646 | GS-2646 |
| GS-2668 DC | GS-2668 DC |
| GS-2668 RT | GS-2668 RT |
| GS-2669RT | GS-2669RT |
| GS-3232 | GS-3232 |
| GS-3246 | GS-3246 |
| GS-3268 DC | GS-3268 DC |
| GS-3268 RT | GS-3268 RT |
| GS-3369RT | GS-3369RT |
| GS-3384 | GS-3384 |
| GS-3390 | GS-3390 |
| GS-4047 | GS-4047 |
| GS-4069RT | GS-4069RT |
| GS-4390 | GS-4390 |
| GS-4655 | GS-4655 |
| GS-5390 | GS-5390 |
| GTH-644 | GTH-644 |
| GTH-842 | GTH-842 |
| GTH-844 | GTH-844 |
| GTH-1048 | GTH-1048 |
| GTH-1056 | GTH-1056 |
| IWP | IWP |
| IWP Super Series | IWP Super Series |
| Load Lifter | Load Lifter |
| PLC PLI | PLC PLI |
| PLM | PLM |
| Powered Superlift Advantage | Powered Superlift Advantage |
| RL4 | RL4 |
| RL4000 | RL4000 |
| S-40 | S-40 |
| S-45 | S-45 |
| S-60 | S-60 |
| S-60 HC | S-60 HC |
| S-60 J | S-60 J |
| S-60 TRAX | S-60 TRAX |
| S-60 XC | S-60 XC |
| S-60X | S-60X |
| S-65 | S-65 |
| S-65 TRAX | S-65 TRAX |
| S-80 | S-80 |
| S-80X | S-80X |
| S-85 | S-85 |
| S-85 XC | S-85 XC |
| S-100 | S-100 |
| S-100HD | S-100HD |
| S-105 | S-105 |
| S-120 | S-120 |
| S-120HD | S-120HD |
| S-125 | S-125 |
| S-3200 | S-3200 |
| S-3800 | S-3800 |
| Super Hoist | Super Hoist |
| Super Tower | Super Tower |
| Super-Straddle | Super-Straddle |
| Superlift Advantage | Superlift Advantage |
| SX-125 XC | SX-125 XC |
| SX-135 XC | SX-135 XC |
| SX-150 | SX-150 |
| SX-180 | SX-180 |
| TML-4000N | TML-4000N |
| TMZ-50/30 | TMZ-50/30 |
| TZ-34/20 | TZ-34/20 |
| TZ-50 | TZ-50 |
| TZ-50/30 | TZ-50/30 |
| Z-20/8 | Z-20/8 |
| Z-20/8N | Z-20/8N |
| Z-25/8 | Z-25/8 |
| Z-30/20 | Z-30/20 |
| Z-30/20 N | Z-30/20 N |
| Z-30/20HD | Z-30/20HD |
| Z-33 DC Power | Z-33 DC Power |
| Z-34 IC | Z-34 IC |
| Z-34/22 Bi-Energy | Z-34/22 Bi-Energy |
| Z-34/22 DC | Z-34/22 DC |
| Z-34/22 IC | Z-34/22 IC |
| Z-34/22 N | Z-34/22 N |
| Z-45 XC | Z-45 XC |
| Z-45/22 | Z-45/22 |
| Z-45/22 MP | Z-45/22 MP |
| Z-45/25 | Z-45/25 |
| Z-45/25 IC | Z-45/25 IC |
| Z-45/25J Bi-Energy | Z-45/25J Bi-Energy |
| Z-45/25J DC | Z-45/25J DC |
| Z-45/25J IC | Z-45/25J IC |
| Z-45/25J IC Power | Z-45/25J IC Power |
| Z-51/30J | Z-51/30J |
| Z-60/34 | Z-60/34 |
| Z-62/40 | Z-62/40 |
| Z-80/60 | Z-80/60 |
| Z-135/70 | Z-135/70 |
| Z33/18 | Z33/18 |
| ZX-135/70 | ZX-135/70 |
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.
