Graco 111559 Retaining Ring – Precision Support for Pump Assemblies
Compatible Machines
- Graco High-Pressure Airless Sprayer Pump Heads
- Graco Commercial Airless Sprayers
- Graco Piston Pump Assemblies
- Graco Diaphragm Pump Assemblies
- Other Graco spray systems requiring internal retaining ring support
Product Overview
The Graco 111559 Retaining Ring is an essential component for securing internal components in high-pressure pump assemblies. Engineered from stainless steel, it ensures stable piston alignment, prevents axial displacement, and maintains consistent spray performance in professional coatings applications.
Key Features
- High-grade stainless steel construction with corrosion-resistant finish
- Precision CNC-machined with tight dimensional tolerances
- Maintains alignment of pump shafts and pistons under high pressure
- Supports consistent spray tip flow and uniform finish quality
- Quick-snap installation for easy replacement and maintenance
Technical Specifications
| Specification | Detail |
| Part Number | 111559 |
| Material | 17-4 PH Stainless Steel |
| Inner Diameter | 0.450 in ±0.002 in |
| Outer Diameter | 0.500 in ±0.002 in |
| Hardness | HRC 38–42 |
| Operating Pressure | Up to 5000 psi |
Installation & Maintenance
Install the 111559 Retaining Ring with a controlled-velocity press tool to avoid deformation. Keep the housing clean, lubricate lightly, and inspect shaft and wear sleeves. Routine service intervals align with pump rebuild schedules (500–1000 operating hours).
Frequently Asked Questions
It is made from high-grade 17-4 PH stainless steel with a corrosion-resistant plating for durability under high-pressure applications.
The ring fits Graco high-pressure pump heads, commercial airless sprayers, piston and diaphragm pump assemblies, and other systems requiring internal retaining support.
By securing the piston and housing interface, it prevents axial displacement, ensures seal preload, and maintains consistent orifice velocity, which translates to uniform spray patterns and reduced downtime.
Conclusion
The Graco 111559 Retaining Ring is a precision-engineered component essential for high-pressure pump stability, consistent spray performance, and extended service life in Graco airless sprayers.
