Industrial Round Holding Magnet Explained

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WL4025 Round Holding Magnet Guide

A round holding magnet is an electromagnet powered by DC voltage and safe to hold ferromagnetic objects once it is powered. This magnet only generates magnetic field forces once electricity flows through its copper wire inside. This differs from permanent magnets. The round shape of this magnet ensures that the magnetic field is evenly distributed and provides consistent interaction with flat metal surfaces.

Round holding magnets come with a lot of holding power given the small size. It is possible to use the magnet instantly with the ability to regulate the power using DC. The sealing also makes it strong enough for industrial use. It comes with a model that is always on. It also continues working even after a long duration. It saves on the amount of power required, hence the cost. It also saves on the amount of heat produced. It is possible to select the cable diameter, length, and voltage. It also comes with a nickel coating that makes it resistant to rusting. It is simple and does not need a lot of maintenance. It is also long-lasting. It is therefore appropriate for safety locking applications.

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How Round Holding Magnet Works ？

Overview of the Round Holding Magnet Product

Round holding magnets, which refer to DC-powered electromagnetic devices, are designed for controlled gripping of metal objects. This type of magnet is great for use in automation, as well as in locking systems, since it has a small circular body that is capable of delivering a strong magnetic output.

WL4025 Round Holding Magnet video

How to Choose the Round Holding Magnet

Holding Electromagnet Series Product.xlsx

WL4025 Round Holding Magnet Datasheet

Brand	Weilong Technology	Model Number	WL 4025
Rated Voltage (V)	DC 24V	Rated Power(W)	4.5 W
Work Model	Holding Suction	Attraction Force	3500 GF
Stroke(mm)	Customized	Reset Time(s)	1 S
Service Life	500 Thousand Times	Certification	CE,ROHS,ISO9001,
Material	Carbon Steel House with Zinc Coating	Lead Wire Length(mm)	200
Install Style	screw	Tolerance of Dimension	+/- 0.1 MM
Water-proof	yes	Insulation Class	F 155 Degree
Hi-Pot Test	AC 600V 50/60Hz 2s	Resistance	132 ohm
Working Temperature	-10°C-100°C	Duty Cycle	1-100%
Thread Depth(mm)	M5 * 6	Payment Term	TT, or LC At Sight
Sample Order	Yes	Warranty	1 Year
MOQ	1000 PCS	Supply Ability	5000 pcs per Week
Delivery Time	30 Days	Port of Loading	shenzhen

WL4025 Round Holding Magnet Application

Round holding magnets are generally utilized in industrial automation systems and safety systems. The holding magnet is utilized for holding metal parts during machining or assembly on industrial machines. The robotics industry utilizes the holding magnet for holding steel parts during the assembly process.

Round electromagnets hold metal panels or tools from moving during the usage of the tools. Round holding magnets also serve as electromagnetic locks on access control systems and industrial doors.

Holding magnets utilized in safety equipment ensure the working of the equipment during emergencies by detaching the magnet from the metal during a power outage. Round holding magnets are utilized in transportation equipment and vending machines.

Holding magnets utilized in medical and laboratory equipment include small holding magnets for holding metal parts during usage without any wear and tear on the equipment. Round holding magnets are utilized for applications where a steady holding power is required without any noise because they react quickly.

Round holding magnets serve as a controlled and energy-efficient solution for the industrial sector because they only work during the flow of electric current.

The Advantage and Disadvantage of WL4025 Round Holding Magnet

The Pros of WL4025 Round Holding Magnet

Round holding magnets enable you to control the magnetic power and disconnect the electric current easily. Round holding magnets allow you to engage and disconnect the electric current instantly without any friction. Round holding magnets come with a small and circular design that ensures the magnetic field is evenly distributed and the surface is in good touch. Round holding magnets come with a continuous duty option and can be utilized for a longer period. Round holding magnets do not require any maintenance and come with a longer lifespan.

The Disadvantages of WL4025 Round Holding Electromagnet

These require a constant source of power to retain their holding force. This requires more energy if used for a long time. Proper management of heat generation is also important. Material used and smoothness of the surface have a major effect on holding force. These operate on materials that are ferromagnetic in nature. For example, mild steel. If not designed properly, there is a chance for residual magnetism to occur. These are not good for holding objects without a power supply, unlike permanent magnets.

The FAQ of WL4025 Round Holding Magnet

1 Why is the actual holding force lower than the one listed in the catalog?

For ideal situations, the actual holding force of the catalog data is tested by:

A low-carbon steel plate, smooth and flat

Full touch with the surface

No room for air

However, the actual situations are usually accompanied by paint, rust, roughness, or thin steel plates, all of which reduce the magnetic force. It’s always a good idea to add a buffer zone of 30% to 50%.

2 Does a spherical round holding magnet always use electricity?

Yes, a DC Round Holding Magnet requires constant power supply for the holding force. The holding force disappears if the power supply is interrupted. For power conservation, duty cycle optimization can be considered.

3 Will the round holding magnet overheat if it’s running for a long time?

The increase of temperature depends on:

Stability of the voltage

Temperature of the environment

Duty cycle

Conditions of heat dissipation

For the ones designed for continuous duty (100% ED), running for a long time is not a problem, but ventilation is necessary.

4 Can it hold aluminum or stainless steel?

Round holding magnets can only hold ferromagnetic materials, such as:

Steel that is not too strong

Steel made of carbon

Iron

You can’t hold non-magnetic stainless steel, aluminum, and copper well.

5. Is there still magnetism once the power is turned off?

When the magnets are made properly, there is very little residual magnetism. However, depending on the kind of steel and the magnetic circuit, there may be some residual magnetism.

6. How do I know what voltage to use for the round holding magnet?

Common voltages used include

12V DC

24V DC

48V DC

Decide based on:

Available power supply

Safety standards

Present capacity

Industrial automation uses 24V DC extensively.

7 Is it possible to change the holding force?

Yes. You can customize it in the following ways:

Height and diameter

Level of holding force

Resistance of the coil

Length of the cable

Coating the surface

OEM and ODM designs are available.

8 How long will it last?

Length of service life depends on:

Temperature of operation

Duty cycle

Environment

In an industrial environment, a spherical holding magnet can last for a long time if well-designed and with a good source of power.

Tips For Choosing the Round Holding Magnet

The right choice of a round holding magnet, which is a type of DC electromagnet, is of critical importance in order to ensure that you have a product that is of high quality, one that is safe, and one that lasts for a long time. The following is a useful guide that you can use in order to make a good choice of an industrial product.

1️⃣ Set the Minimum Holding Force

Determine how much the load actually weighs (in kg or N).

Add a safety factor: 30 to 50%.

Include shock, vibration, or holding it vertically.

Assess the state of the real surface in contact (flat steel is the strongest).

📌 Important: The published holding force is tested under ideal conditions with a low-carbon steel surface.

2. Check the voltage and power supply

Standard voltages: 12V DC, 24V DC, 48V DC.

Verify the DC power supply is steady.

Verify the maximum current and power usage.

Verify the control method (driver board, relay, PLC).

The power supply must be on at all times for holding force.

3. Find out the duty cycle

Continuous duty (100% ED) is required for applications where power is needed 100% of the time.

Intermittent duty is for holding something for a short period.

If continuous duty is required:

Proper heat loss.

Within a safe temperature rise.

4. Check the installation and mounting

Room for installation (height and diameter).

How is it installed (through hole, threaded hole, or surface mount)?

How does the cable come out?

Flatness of the workpiece’s surface.

Full surface contact is the strongest grip.

5 Look at the environment where it will be used

Inside or outdoors?

How humid is the environment?

Were you around oil or dust?

What is the temperature range?

Think about the following for tough environments:

Nickel- or epoxy-coated

Sealing to keep water out

Class F or H for better insulating capabilities

6️ Think about how the materials will work together

Round holding magnets only work well with:

Steel which is not too hard

Steel which is made of carbon

Iron

They do not work well with:

Aluminum

Stainless steel, which is not magnetic

Copper

7️ Think about safety and compliance

For people who buy things in Europe:

Is there compliance to CE?

Is there RoHS compliance?

Reports on tests provided

Is there a process for quality control?

8️ Ask for Sample Testing

Before you make a lot of them:

Would you like to see test data on the holding force?

Would you like to see the report on the rise in temperature?

Would you like to see tests in real-world situations?

Checklist for Quick Selection

Required holding force (kg/N)

Voltage supply available

Continuous or intermittent duty

Is the mounting structure confirmed?

Environmental conditions assessed?

Is surface contact quality guaranteed?

Compliance requirements verified?

Tip for people who buy things for businesses

When picking a magnet, make sure to select one that has a holding force greater than you require. This is especially true if you’re going to use the magnet vertically. Conditions in the real world will lower the magnet’s effective holding power.