Core/Plunger: Diameter 5-50 mm, Stroke Length 2-100 mm

Q: What is the primary function of a core plunger in industrial actuators?

The core plunger converts electromagnetic energy from the drive coil into precise linear mechanical motion, enabling actuation in valves, switches, and automation systems.

Q: How do material choices affect core plunger performance?

Materials like silicon steel reduce eddy current losses, while coatings enhance durability. Magnetic permeability directly impacts force output and response efficiency.

Component Specifications

Definition

The core plunger is a cylindrical ferromagnetic component that moves axially within a drive coil assembly when energized by electrical current. It serves as the moving element in solenoid actuators, electromagnetic valves, and linear motion systems, translating electromagnetic force into precise mechanical displacement. Its design ensures minimal friction, consistent magnetic coupling, and reliable operation in industrial automation applications.

Working Principle

When electrical current flows through the drive coil, it generates a magnetic field that attracts or repels the ferromagnetic core plunger, causing linear motion. The plunger's movement is proportional to the current magnitude and coil design, enabling controlled actuation in mechanical systems.

Materials

Typically made from low-carbon steel (AISI 1010/1018), silicon steel, or soft magnetic alloys like Permendur for enhanced magnetic permeability and reduced hysteresis. Surface treatments include zinc plating, nickel coating, or passivation for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	5-50 mm
Coil Voltage	12-240 V DC/AC
Response Time	<50 ms
Stroke Length	2-100 mm
Operating Force	10-500 N
Operating Temperature	-20°C to 120°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 4401, DIN 24342, ISO 5599-1

Parent Products

This component is used in the following industrial products

Drive Coil / Actuator

Electromechanical component that converts electrical energy into mechanical motion within a drive system

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Engineering Analysis

Risks & Mitigation

Magnetic saturation reducing force
Mechanical wear from cyclic motion
Corrosion in humid environments
Coil overheating affecting performance

FMEA Triads

Trigger: Inadequate lubrication
Failure: Increased friction leading to stuck plunger
Mitigation: Implement regular maintenance schedules and use compatible lubricants

Trigger: Material fatigue from high-cycle operation
Failure: Fracture or deformation of plunger
Mitigation: Use fatigue-resistant alloys and design within stress limits

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm diameter, ±0.1 mm length

Test Method

Magnetic flux testing, dimensional verification, cycle life testing per ISO 19973

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Supplier transparency

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Manufacturers of Core/Plunger

Manufacturer profiles associated with Core/Plunger.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a core plunger in industrial actuators?