

Precision piston retaining nut that secures the piston within Graco pump assemblies, ensuring stable, high-pressure operation and preventing loosening during continuous use.
| Compatible Machines | Application Role |
|---|---|
| Graco Airless Pump Assemblies (select models) | Secures piston assembly within pump system for stable operation |
| Graco Contractor Sprayers | Retains piston components under high-pressure cycling |
| Graco Reciprocating Pump Systems | Maintains mechanical integrity of piston-to-rod connection |
| Graco OEM Pump Rebuild Kits | Used during piston assembly installation and servicing |
The Graco 17N040 Piston, Nut is a precision fastening component used within Graco airless pump assemblies to securely retain the piston in place during high-pressure operation. It ensures proper alignment and mechanical stability within the reciprocating pump system.
Designed for demanding contractor and industrial environments, this piston nut plays a critical role in maintaining pump integrity, preventing loosening under vibration, pressure cycling, and continuous operation.
The 17N040 piston nut is used in select Graco pump systems where secure piston fastening is required. It is commonly found in:
Compatibility varies depending on pump model and piston configuration.