Graco 15G204 Retaining Nut

Compatible Machines for the 15G204 Nut, Retaining

• Graco GH-833 Displacement Pump (4 GPM flow band)
• Graco 287834 Displacement Pump (4 GPM flow band)
• Graco ProContractor Series Pump Kits – 4 GPM models

Product Overview

The 15G204 Nut, Retaining is a critical fastening component engineered for demanding airless spray systems. It secures the internal assemblies of high-performance pump modules, maintaining alignment and preload of sealing stacks in 4 GPM equipment.

Key Features

Materials & Performance

Manufactured from high-grade stainless steel or a hardened alloy, this retaining nut is built for robust service in aggressive spraying environments. The precision-turned threads ensure even load distribution, reduce risk of loosening under vibration, and help protect adjacent seal components from premature wear.

Installation & Maintenance

• Use a calibrated torque wrench to install—proper preload prevents thread galling and ensures long service life.
• Inspect the nut and mating housing threads periodically, especially after exposure to abrasive or chemically aggressive coatings.
• Replace the nut if you observe radial play, thread deformation, loosening under load, or leakage at the interface.
• Maintain upstream filtration and keep fluid systems clean to optimize overall component lifespan.

Applications

This component is suitable for industrial airless spray systems, plural-component equipment, fluid dispensing modules and high-volume finishing lines. Wherever consistent rod alignment, seal integrity and minimal downtime are priorities, the 15G204 retaining nut supports professional performance.

Frequently Asked Questions