Product Description
Atlas AT Z-1130 tab washer for Zenith (Type 9) manual pallet jack hydraulic units. Carbon steel construction, 1.12 inch OD, 0.75 inch ID, case hardened, with two opposing locking tabs for securing round nuts. Used in critical fastener assemblies to prevent unintentional loosening.
Compatibility: Fits pallet jacks made by Atlas, model Zenith (Type 9). Alternate model: Zenith(Type9). SKU: AT Z-1130
Specifications
Dimensional Specifications
| Outer Diameter | 1.12 inch |
| Inner Diameter | 0.75 inch |
| Overall Thickness | 0.085 inch ±0.005 inch |
Material & Construction
| Material | Carbon steel |
| Case Hardened | Yes |
| Locking Tabs | Two opposing locking tabs |
| Finish/Coating | Industrial phosphate finish |
Application
| Application | Used in critical fastener assemblies to prevent unintentional loosening in hydraulic pump assemblies |
Part Numbers
| Manufacturer Part Number | AT Z-1130 |
| Original Equipment Compatible Part Number | Z-1130 |
| Compatible Equipment | Atlas Zenith Type 9 |
Frequently Asked Questions
Q: What is the purpose of the AT Z-1130 tab washer?
A: The AT Z-1130 is a locking tab washer that prevents round nuts from unintentionally loosening due to vibration and repeated pressure cycles in the hydraulic pump assembly. The two opposing locking tabs bend against the nut flats to secure critical hydraulic connections on Atlas Zenith Type 9 manual pallet jacks.
Q: What are the exact dimensions of the AT Z-1130?
A: The AT Z-1130 has an outer diameter of 1.12 inches, inner diameter of 0.75 inches, and an overall thickness of 0.085 inches ±0.005 inches. These precise dimensions ensure proper seating under the nut and tab engagement with the nut flats.
Q: What material and finish does the AT Z-1130 use and why?
A: The AT Z-1130 is manufactured from carbon steel with case hardening and an industrial phosphate finish. Case hardening provides hardness for the locking tabs to resist deformation when bent, while the phosphate finish offers corrosion resistance in hydraulic fluid environments and humidity.
Q: How do I identify if an AT Z-1130 needs replacement?
A: Inspect the washer for flattened or bent tabs, cracks, or permanent deformation. If the hydraulic fitting shows signs of weeping or if the round nut was found loose during maintenance, the tab washer has likely failed and must be replaced immediately to prevent hydraulic leakage.
Q: Is the AT Z-1130 a single-use or reusable component?
A: Tab washers are single-use components. Once the locking tabs are bent against the nut, they lose their locking ability if removed and reused. Always replace with a new AT Z-1130 tab washer during any hydraulic disassembly on Atlas Zenith Type 9 equipment.
Q: What equipment is the AT Z-1130 compatible with?
A: The AT Z-1130 is designed specifically for Atlas Zenith Type 9 manual pallet jacks and their hydraulic pump assemblies.