AT Z-1131

Frequently Asked Questions

Q: What is the AT Z-1131 round nut used for on Atlas Zenith pallet jacks?
A: The AT Z-1131 is a round nut used in the hydraulic pump assembly and wheel hub retention systems of Atlas Zenith manual pallet jacks. It threads onto pump discharge connections and wheel hub studs to secure critical hydraulic and mechanical subassemblies.

Q: What thread size and pitch is the AT Z-1131 round nut?
A: Verify the thread specification in your Atlas Zenith technical documentation or by direct measurement of the threaded connection. Common hydraulic nut threads on Zenith pumps include SAE or metric standard pitches. Cross-check the thread size before ordering to ensure proper fitment.

Q: Should the AT Z-1131 be used with a tab washer?
A: Yes. The AT Z-1131 round nut should be paired with the AT Z-1130 tab washer on Atlas Zenith Type 9 hydraulic pump connections. The tab washer prevents the nut from loosening under vibration and pressure cycling. Always install both components together during assembly.

Q: What material is the AT Z-1131 round nut made from?
A: Atlas Zenith round nuts are typically manufactured from carbon steel or alloy steel with protective plating or phosphate finish to resist corrosion in hydraulic fluid and humid environments. Verify the specific material grade and coating in your OEM parts documentation.

Q: How do you remove a seized or corroded AT Z-1131 round nut?
A: Do not force removal. Apply penetrating oil and allow time for penetration. Use a properly-sized round nut socket or wrench to avoid stripping the drive lugs. If the nut does not turn freely, consult technical support rather than risk damaging the threaded connection or pump casting.