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Graco 112640 Compression Spring

The Graco 112640 Compression Spring provides consistent force for optimal spray performance in piston assemblies. Key highlights include:

  • High-tensile SS302 stainless steel for durability
  • Free length: 0.62 in (15.75 mm) with precise coil pitch
  • Spring rate: 5.2 lb/in for smooth operation
  • Fits Graco PRO 5500HC and PRO XP series spray guns

$14.79
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Graco 112640 Compression Spring Overview

The Graco 112640 Compression Spring is a precision-wound component designed for high-pressure airless sprayer piston assemblies. It maintains consistent force under cyclic loading, ensuring optimal pump efficiency and smooth spray operation.

Key Features

  • High-tensile stainless steel construction (SS302) for corrosion resistance
  • Wire diameter: 0.032 in (0.81 mm) with precise coil pitch
  • Free length: 0.62 in (15.75 mm) with ±0.005 in tolerance
  • Spring rate: 5.2 lb/in (0.92 N/mm) for consistent compression
  • Durable under 100,000+ reciprocating cycles

Compatible Machines

The Graco 112640 Compression Spring fits the following machines:

  • Graco PRO 5500HC Spray Gun (piston assembly)
  • Graco PRO XP Series (similar piston assemblies)
  • Industrial airless sprayer pump assemblies compatible with 112640 spring

Design Specifications

Specification Details
Material SS302 Stainless Steel, electropolished & passivated
Wire Diameter 0.032 in (0.81 mm)
Free Length 0.62 in (15.75 mm) ±0.005 in
Spring Rate 5.2 lb/in (0.92 N/mm)
Temperature Range -20 °C to 80 °C
Max Working Pressure 2,000–3,000 psi

Maintenance & Installation

  • Inspect free length and coil integrity periodically
  • Replace if deformation exceeds tolerance
  • Use with precision piston rod and dynamic O-ring seals
  • Follow recommended torque sequencing on retaining cap

Frequently Asked Questions

It is made from high-tensile SS302 stainless steel with electropolishing and passivation for corrosion resistance.

It fits Graco PRO 5500HC, PRO XP Series, and compatible industrial airless sprayer piston assemblies.

The spring performs optimally under pressures from 2,000 to 3,000 psi in professional coatings applications.

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