INDUSTRY COMPONENT

Plunger/core

Plunger/core is the moving component in solenoid or pneumatic actuators that converts electromagnetic or pneumatic energy into linear mechanical motion.

Component Specifications

Definition
The plunger/core is a critical component in solenoid and pneumatic actuators, consisting of a cylindrical rod or shaft that moves linearly within a coil or cylinder. In solenoid actuators, it's typically made of ferromagnetic material and moves when electromagnetic force is applied. In pneumatic actuators, it's driven by compressed air pressure. This component directly transfers force to perform work such as opening valves, engaging clutches, or actuating mechanisms in industrial automation systems.
Working Principle
In solenoid actuators: When electrical current flows through the coil, it creates a magnetic field that attracts the ferromagnetic plunger, causing linear movement. In pneumatic actuators: Compressed air pressure acts on the plunger surface area, creating force that moves the plunger linearly. The plunger converts electromagnetic or pneumatic energy into mechanical motion through controlled linear displacement.
Materials
Common materials include: 1. Low-carbon steel (AISI 1018, 1020) for general applications; 2. Stainless steel (304, 316) for corrosive environments; 3. Aluminum alloys (6061-T6) for lightweight applications; 4. Brass for non-magnetic applications; 5. Plated steel (zinc, nickel, chrome) for wear resistance and corrosion protection; 6. Hardened steel (AISI 4140, 4340) for high-wear applications.
Technical Parameters
  • Diameter 3-50 mm
  • Hardness HRC 30-60
  • Stroke Length 5-200 mm
  • Surface Finish Ra 0.4-1.6 μm
  • Operating Force 5-5000 N
  • Roundness Tolerance 0.005-0.02 mm
  • Operating Temperature -20°C to +120°C
  • Straightness Tolerance 0.01-0.1 mm/100 mm
Standards
ISO 6431, ISO 15552, DIN ISO 6431, DIN 24554, ISO 21287

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Plunger/core.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Wear and tear leading to increased clearance
  • Corrosion in harsh environments
  • Magnetic degradation in solenoid cores
  • Fatigue failure from cyclic loading
  • Seal damage causing leakage
  • Misalignment causing binding
FMEA Triads
Trigger: Insufficient lubrication
Failure: Increased friction and wear
Mitigation: Implement regular lubrication schedule; use self-lubricating materials; install automatic lubrication systems
Trigger: Corrosive environment exposure
Failure: Material degradation and pitting
Mitigation: Use corrosion-resistant materials; apply protective coatings; implement environmental controls
Trigger: Excessive side loading
Failure: Bending and binding
Mitigation: Install proper guides and supports; ensure proper alignment; use reinforced plunger designs

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter: ±0.01 mm to ±0.05 mm; Length: ±0.1 mm to ±0.5 mm; Straightness: 0.01 mm/100 mm max; Surface finish: Ra 0.4-1.6 μm
Test Method
Dimensional verification with CMM; Hardness testing (Rockwell or Brinell); Surface roughness measurement; Magnetic property testing (for solenoid cores); Pressure testing (for pneumatic applications); Fatigue testing for cyclic applications

Buyer Feedback

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"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Plunger/core meets all ISO standards."

"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Plunger/core arrived with full certification."

"Great transparency on the Plunger/core components. Essential for our Machinery and Equipment Manufacturing supply chain."

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Frequently Asked Questions

What is the difference between plunger and core in actuator terminology?

In solenoid actuators, 'core' typically refers to the ferromagnetic moving part, while 'plunger' is more commonly used in pneumatic actuators. However, the terms are often used interchangeably in industrial contexts.

How do I select the right plunger material for my application?

Consider: 1. Magnetic properties for solenoid applications; 2. Corrosion resistance for the operating environment; 3. Wear resistance for high-cycle applications; 4. Strength requirements for the applied forces; 5. Temperature range of operation.

What maintenance is required for plunger components?

Regular inspection for wear, corrosion, and straightness; lubrication according to manufacturer specifications; cleaning to prevent contamination; and periodic replacement based on cycle count or wear measurements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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