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Graco 158390 Stop Nut

The Graco 158390 Stop Nut is a genuine OEM part that ensures accurate valve adjustment and secure operation in Graco spray systems.

  • Fits: Graco President 10:1 Air Spray Systems (205-626, 205-627, 205-628)
  • Function: Maintains valve clearance and prevents over-travel
  • Material: High-strength, corrosion-resistant steel
  • Use: Industrial pumps and coating applications

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Graco 158390 Stop Nut – Reliable Component for Precision Adjustment

The Graco 158390 Stop Nut is a genuine OEM replacement part designed for securing and adjusting internal assemblies within Graco pump and spray systems. It ensures correct valve clearance and stable operation under continuous use.

Compatible Machines

  • Graco President 10:1 Ratio Air Spray System (Models 205-626, 205-627, 205-628)
  • Also used in various Graco industrial pump assemblies and airless systems utilizing adjustable stop components

Product Details

Specification Description
Part Number 158390
Part Type Stop Nut (Nut, Stop)
Function Provides clearance and locking for valve adjustment in Graco pump assemblies
Material High-strength steel, corrosion-resistant finish
Application Used in fluid handling systems, airless sprayers, and industrial coating pumps

Key Features

  • Durable Construction: Machined steel for maximum wear resistance
  • Precision Fit: Maintains correct mechanical clearance for stable operation
  • OEM Quality: Genuine Graco component ensures compatibility and reliability
  • Easy Maintenance: Designed for quick replacement and long service life

Frequently Asked Questions

The stop nut controls and secures the valve clearance in Graco pump assemblies, ensuring proper alignment and preventing over-travel or leakage during operation.

It fits the Graco President 10:1 Ratio Air Spray Systems (models 205-626, 205-627, 205-628) and other Graco pump assemblies that use adjustable stop mechanisms.

The 158390 Stop Nut is a genuine OEM Graco component, designed to meet the manufacturer’s original specifications for fit and performance.

Check your pump’s parts manual or service diagram for the term “Stop Nut” or part number 158390. If it matches, this part is compatible. When uncertain, contact a Graco dealer for cross-reference confirmation.

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