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Replacement piston for the JET JAT-800A and JAT-821A air hammers (JSG-9121 / JSG-9121NS). The piston is the impact element that takes air pulse and delivers it to the chisel retainer — the part that transfers compressed air into hammer blows. OEM replacement; lubricate per the manual at reassembly so seal life and impact energy come back at spec.
Features
- JET OEM piston for the JAT-800A and JAT-821A air hammer (JSG-9121 / 9121NS)
- Hardened striking face — direct OEM replacement for the original impact element
- Restores BPM and impact energy to the JAT-800A / JAT-821A's factory specification
Where it fits
Shown as item 33 (Piston) in the parts diagram of the JAT-821A Manual, page 10. The photo is the boxed area of that diagram — match the item number to your machine's parts list before ordering, or call us at (888) 714-1410 with your model and serial number.
| Specifications | |
|---|---|
| Country of Origin | China |
| Fits Model | JAT-800A, JAT-821A |
| Warranty | Ninety Days |