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MW 2x4 / N38 - cylindrical magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

cylindrical magnet

Catalog no 010055

GTIN/EAN: 5906301810544

5.00

Diameter Ø

2 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

0.09 g

Magnetization Direction

↑ axial

Load capacity

0.09 kg / 0.86 N

Magnetic Induction

597.70 mT / 5977 Gs

Coating

[NiCuNi] Nickel

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0.209 ZŁ with VAT / pcs + price for transport

0.1700 ZŁ net + 23% VAT / pcs

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Product card - MW 2x4 / N38 - cylindrical magnet

Specification / characteristics - MW 2x4 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010055
GTIN/EAN	5906301810544
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
Diameter Ø	2 mm [±0,1 mm]
Height	4 mm [±0,1 mm]
Weight	0.09 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.09 kg / 0.86 N
Magnetic Induction ~ ?	597.70 mT / 5977 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 2x4 / N38 - cylindrical magnet

properties	values	units
remenance Br [min. - max.] ?	12.2-12.6	kGs
remenance Br [min. - max.] ?	1220-1260	mT
coercivity bHc ?	10.8-11.5	kOe
coercivity bHc ?	860-915	kA/m
actual internal force iHc	≥ 12	kOe
actual internal force iHc	≥ 955	kA/m
energy density [min. - max.] ?	36-38	BH max MGOe
energy density [min. - max.] ?	287-303	BH max KJ/m
max. temperature ?	≤ 80	°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

properties	values	units
Vickers hardness	≥550	Hv
Density	≥7.4	g/cm³
Curie Temperature TC	312 - 380	°C
Curie Temperature TF	593 - 716	°F
Specific resistance	150	μΩ⋅cm
Bending strength	250	MPa
Compressive strength	1000~1100	MPa
Thermal expansion parallel (∥) to orientation (M)	(3-4) x 10^-6	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10^-6	°C^-1
Young's modulus	1.7 x 10⁴	kg/mm²

Physical analysis of the magnet - report

The following data represent the direct effect of a physical calculation. Results were calculated on models for the class Nd₂Fe₁₄B. Operational performance may differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 2x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5954 Gs 595.4 mT	0.09 kg / 90.0 g 0.9 N	low risk
1 mm	1696 Gs 169.6 mT	0.01 kg / 7.3 g 0.1 N	low risk
2 mm	570 Gs 57.0 mT	0.00 kg / 0.8 g 0.0 N	low risk
3 mm	256 Gs 25.6 mT	0.00 kg / 0.2 g 0.0 N	low risk
5 mm	82 Gs 8.2 mT	0.00 kg / 0.0 g 0.0 N	low risk
10 mm	15 Gs 1.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
15 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
20 mm	2 Gs 0.2 mT	0.00 kg / 0.0 g 0.0 N	low risk
30 mm	1 Gs 0.1 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	0 Gs 0.0 mT	0.00 kg / 0.0 g 0.0 N	low risk

Magnetic force decreases drastically with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., dirt, paint, rust) noticeably weakens the grip. Magnetic products work most effectively during direct contact; gap weakens the power. Analyze how flashily the pull force drop, when the magnet does not adhere flatly to the metal substrate. When calculating the mounting, avoid redundant distances.

Table 2: Sliding force (wall)
MW 2x4 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.02 kg / 18.0 g 0.2 N
1 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
2 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
3 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
5 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
10 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data indicates the theoretical weight limit sufficient to start the downward movement of the magnet down along a vertical steel wall (considering typical friction coefficient). The holding force is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 2x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.03 kg / 27.0 g 0.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.02 kg / 18.0 g 0.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.01 kg / 9.0 g 0.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.05 kg / 45.0 g 0.4 N

When mounting a holder on a upright surface (e.g., a fridge), it will maintain just approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient cause that products move down easier than they pop off the substrate. Want to create a hanger? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a much lighter load. Using a rubber layer can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MW 2x4 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.01 kg / 9.0 g 0.1 N
1 mm	25%	0.02 kg / 22.5 g 0.2 N
2 mm	50%	0.05 kg / 45.0 g 0.4 N
5 mm	100%	0.09 kg / 90.0 g 0.9 N
10 mm	100%	0.09 kg / 90.0 g 0.9 N

A thin metal plate is not enough to focus the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize full efficiency of this magnet's potential, you require a sufficiently solid element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
MW 2x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.09 kg / 90.0 g 0.9 N	OK
40 °C	-2.2%	0.09 kg / 88.0 g 0.9 N	OK
60 °C	-4.4%	0.09 kg / 86.0 g 0.8 N	OK
80 °C	-6.6%	0.08 kg / 84.1 g 0.8 N
100 °C	-28.8%	0.06 kg / 64.1 g 0.6 N

Ordinary NdFeB products irreversibly lose strength past the thermal threshold. Watch out for overheating – heat can permanently destroy this magnet. As the temperature rises, the neodymium's capacity briefly drops. Avoid using this magnet close to ovens exceeding its working range. Too high temperature will cause destruction of magnetic properties.

*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 2x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	0.69 kg / 687 g 6.7 N 6 090 Gs	N/A
1 mm	0.21 kg / 208 g 2.0 N 6 559 Gs	0.19 kg / 187 g 1.8 N ~0 Gs
2 mm	0.06 kg / 56 g 0.5 N 3 391 Gs	0.05 kg / 50 g 0.5 N ~0 Gs
3 mm	0.02 kg / 17 g 0.2 N 1 883 Gs	0.02 kg / 15 g 0.2 N ~0 Gs
5 mm	0.00 kg / 3 g 0.0 N 743 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
10 mm	0.00 kg / 0 g 0.0 N 165 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
20 mm	0.00 kg / 0 g 0.0 N 30 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 3 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets attract each other from a significantly greater distance than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of action. Designing a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when attracting two neodymiums, the collision energy is extreme. The levitation is a bit weaker than the attraction, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 2x4 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	2.0 cm
Hearing aid	10 Gs (1.0 mT)	1.5 cm
Timepiece	20 Gs (2.0 mT)	1.0 cm
Mobile device	40 Gs (4.0 mT)	1.0 cm
Remote	50 Gs (5.0 mT)	1.0 cm
Payment card	400 Gs (40.0 mT)	0.5 cm
HDD hard drive	600 Gs (60.0 mT)	0.5 cm

A strong magnetic field is a real danger to IT equipment as well as medical implants. These NdFeB products generate a field that destroys function of digital equipment. Notice: the unseen radiation penetrates the body and glass. Special caution must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 2x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	31.89 km/h (8.86 m/s)	0.00 J
30 mm	55.24 km/h (15.34 m/s)	0.01 J
50 mm	71.31 km/h (19.81 m/s)	0.02 J
100 mm	100.85 km/h (28.01 m/s)	0.04 J

NdFeB products are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or injury to skin. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Corrosion resistance
MW 2x4 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (P_c)
MW 2x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	209 Mx	2.1 µWb
P_c Coefficient	1.21	High (Stable)

Total magnetic flux emitted by the pole surface. Essential parameter in coil applications as well as sensors. The P_c coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 2x4 / N38

Environment	Effective steel pull	Effect
Air (land)	0.09 kg	Standard
Water (riverbed)	0.10 kg (+0.01 kg Buoyancy gain)	+14.5%

Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds merely a fraction of its nominal pull.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.21

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology

Material specification

iron (Fe)	64% – 68%
neodymium (Nd)	29% – 32%
boron (B)	1.1% – 1.2%
dysprosium (Dy)	0.5% – 2.0%
coating (Ni-Cu-Ni)	< 0.05%

Ecology and recycling (GPSR)

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 010055-2025

Measurement Calculator

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ZM XMAG2 210 elementów - magnetic toy

86.10 ZŁ brutto / pcs

This product is an extremely powerful rod magnet, produced from modern NdFeB material, which, with dimensions of Ø2x4 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.09 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 0.86 N with a weight of only 0.09 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.

Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Magnets N38 are suitable for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø2x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 2 mm and height 4 mm. The value of 0.86 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.09 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Benefits

Besides their immense strength, neodymium magnets offer the following advantages:

Their strength is maintained, and after approximately ten years it drops only by ~1% (according to research),
They feature excellent resistance to magnetic field loss as a result of opposing magnetic fields,
A magnet with a metallic gold surface is more attractive,
Neodymium magnets achieve maximum magnetic induction on a small area, which allows for strong attraction,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Possibility of accurate creating and optimizing to atypical conditions,
Versatile presence in modern industrial fields – they are commonly used in magnetic memories, brushless drives, advanced medical instruments, and industrial machines.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Limitations

Disadvantages of neodymium magnets:

To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
Due to limitations in producing threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Highest magnetic holding force – what affects it?

Magnet power was determined for the most favorable conditions, assuming:

on a base made of mild steel, perfectly concentrating the magnetic field
with a thickness no less than 10 mm
with an polished touching surface
without any clearance between the magnet and steel
during detachment in a direction vertical to the mounting surface
at standard ambient temperature

What influences lifting capacity in practice

Real force impacted by specific conditions, including (from most important):

Distance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet and the plate decreases the holding force.

Safe handling of neodymium magnets

Pacemakers

Individuals with a heart stimulator must keep an large gap from magnets. The magnetism can interfere with the operation of the implant.

Power loss in heat

Watch the temperature. Exposing the magnet to high heat will destroy its properties and strength.

Adults only

Adult use only. Tiny parts pose a choking risk, causing severe trauma. Store out of reach of children and animals.

Magnets are brittle

Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Fire warning

Dust created during grinding of magnets is combustible. Do not drill into magnets unless you are an expert.

Compass and GPS

GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Sensitization to coating

A percentage of the population suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause skin redness. It is best to use safety gloves.

Pinching danger

Big blocks can crush fingers instantly. Never put your hand between two strong magnets.

Respect the power

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Data carriers

Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

Security! Want to know more? Read our article: Why are neodymium magnets dangerous?

MW 2x4 / N38 - cylindrical magnet

Product card - MW 2x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the magnet - report

Table 1: Static pull force (pull vs gap) - interaction chart MW 2x4 / N38

Table 2: Sliding force (wall) MW 2x4 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MW 2x4 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 2x4 / N38

Table 5: Thermal resistance (stability) - thermal limit MW 2x4 / N38

Table 6: Two magnets (attraction) - field range MW 2x4 / N38

Table 7: Safety (HSE) (electronics) - precautionary measures MW 2x4 / N38

Table 8: Impact energy (cracking risk) - collision effects MW 2x4 / N38

Table 9: Corrosion resistance MW 2x4 / N38

Table 10: Construction data (Pc) MW 2x4 / N38

Table 11: Hydrostatics and buoyancy MW 2x4 / N38

1. Wall mount (shear)

2. Efficiency vs thickness

3. Power loss vs temp

4. Demagnetization curve and operating point (B-H)

Material specification

Ecology and recycling (GPSR)

Force (pull)

Field Strength

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ZM XMAG2 210 elementów - magnetic toy

Pros as well as cons of Nd2Fe14B magnets.

Benefits

Limitations

Lifting parameters

Highest magnetic holding force – what affects it?

What influences lifting capacity in practice

Safe handling of neodymium magnets

Pacemakers

Power loss in heat

Adults only

Magnets are brittle

Fire warning

Compass and GPS

Sensitization to coating

Pinching danger

Respect the power

Data carriers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - interaction chart
MW 2x4 / N38

Table 2: Sliding force (wall)
MW 2x4 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 2x4 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 2x4 / N38

Table 5: Thermal resistance (stability) - thermal limit
MW 2x4 / N38

Table 6: Two magnets (attraction) - field range
MW 2x4 / N38

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 2x4 / N38

Table 8: Impact energy (cracking risk) - collision effects
MW 2x4 / N38

Table 9: Corrosion resistance
MW 2x4 / N38

Table 10: Construction data (P_c)
MW 2x4 / N38

Table 11: Hydrostatics and buoyancy
MW 2x4 / N38

Pros as well as cons of Nd₂Fe₁₄B magnets.