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MW 2x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010055

GTIN: 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

0.209 ZŁ with VAT / pcs + price for transport

0.1700 ZŁ net + 23% VAT / pcs

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MW 2x4 / N38 - cylindrical magnet

Specification / characteristics MW 2x4 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010055
GTIN	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	T
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 106	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10-6	°C^-1
Young's modulus	1.7 x 104	kg/mm²

Technical analysis of the product - data

These values are the direct effect of a mathematical analysis. Results are based on models for the class NdFeB. Operational parameters might slightly differ. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
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

Grip strength drops drastically per each millimeter of gap. Keep in mind that even the smallest gap (e.g., dirt, varnish, veneer) strongly reduces the pull force. Magnets hold strongest at the point of direct contact; gap weakens the force. See how flashily the load capacity plummet, when the magnet does not touch directly to the steel surface. When designing the arrangement, avoid unnecessary gaps.

Table 2: Shear Hold (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 table below defines the theoretical holding capacity required to initiate the sliding of the magnet down against a upright steel plate (assuming typical friction). This value 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 hanging a holder on a upright wall (e.g., a car body), it will maintain barely approx. 1/5 of its nominal power. Gravitational force and a weak degree of grip influence the fact that holders slide down faster than they pop off the substrate. Want to create a vertical fastening? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will slip down under a noticeably lighter cargo. Application of an anti-slip pad can significantly increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
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 attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To achieve the maximum of this magnet's power, you require a sufficiently solid element of metal. The material oversaturation causes that on thin elements (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal stability (stability) - power drop
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

Classic neodymiums lose strength after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly demagnetize this product. With increasing heat, the magnet's capacity momentarily drops. Avoid using this magnet in hot environments higher than its safe range. Too high temperature will result in irreversible degradation of magnetic properties.

*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 2x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	0.09 kg / 92 g 0.9 N 12 030 Gs	N/A
1 mm	0.01 kg / 7 g 0.1 N 6 559 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
2 mm	0.00 kg / 1 g 0.0 N 3 391 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
3 mm	0.00 kg / 0 g 0.0 N 1 883 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
5 mm	0.00 kg / 0 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 interact from a wider radius than a neodymium and metal combination. The connection of magnet-to-magnet produces a massive flux and a larger range of performance. Planning to create a solid fastener? Apply two magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the pinch force is extreme. The levitation is marginally weaker than the attraction, but still large.
*Flux density between like poles drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).

Table 7: Hazards (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
Car key	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

Powerful magnet radiation is a real danger to electronics and medical implants. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
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

Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or painful pinches to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MW 2x4 / N38

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	209 Mx	2.1 µWb
Współczynnik Pc	1.21	Wysoki (Stabilny)

Total magnetic flux emitted by the magnet pole. Essential parameter for motor design and sensors. Permeance Coefficient defines the magnet operating point.

Table 11: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

Quick Unit Converter

Pulling Force

Kilograms (kg)

Force in lbs

Field Strength

Tesla (T)

Type your figure into a field, to see the remaining units convert in real-time.

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UMH 48x11x65 [M6] / N38 - magnetic holder with hook

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This product is an extremely powerful rod magnet, manufactured from modern NdFeB material, which, at dimensions of Ø2x4 mm, guarantees the highest energy density. The MW 2x4 / N38 model features high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.09 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 0.86 N with a weight of only 0.09 g, this rod is indispensable in miniature devices and wherever low weight is crucial.

Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 2.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø2x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

This model is characterized by dimensions Ø2x4 mm, which, at a weight of 0.09 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 0.09 kg (force ~0.86 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.

Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 2 mm. 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 diametrically if your project requires it.

Pros and cons of NdFeB magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
They retain their magnetic properties even under external field action,
A magnet with a metallic gold surface has better aesthetics,
Magnets have very high magnetic induction on the outer layer,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
Due to the ability of flexible molding and customization to custom projects, magnetic components can be manufactured in a wide range of shapes and sizes, which expands the range of possible applications,
Significant place in innovative solutions – they are used in computer drives, electric motors, medical equipment, also complex engineering applications.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Problematic aspects of neodymium magnets and ways of using them

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 immune to moisture, in case of application outdoors
Due to limitations in producing threads and complicated forms in magnets, we recommend using cover - magnetic holder.
Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
With budget limitations the cost of neodymium magnets is a challenge,

Maximum lifting force for a neodymium magnet – what it depends on?

The declared magnet strength refers to the maximum value, recorded under ideal test conditions, specifically:

on a base made of mild steel, perfectly concentrating the magnetic field
possessing a massiveness of min. 10 mm to avoid saturation
with a plane cleaned and smooth
with zero gap (no coatings)
for force acting at a right angle (in the magnet axis)
in neutral thermal conditions

Key elements affecting lifting force

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

Air gap (betwixt the magnet and the metal), as even a very small distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Material composition – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. In addition, even a slight gap {between} the magnet and the plate decreases the lifting capacity.

H&S for magnets

Electronic devices

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

ICD Warning

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Physical harm

Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Caution required

Use magnets consciously. Their immense force can surprise even experienced users. Plan your moves and respect their power.

Impact on smartphones

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.

Adults only

Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are tragic.

Nickel coating and allergies

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, immediately stop handling magnets and wear gloves.

Fragile material

NdFeB magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them cracking into small pieces.

Maximum temperature

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Dust explosion hazard

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Danger!

Looking for details? Check our post: Are neodymium magnets dangerous?

MW 2x4 / N38 - cylindrical magnet

MW 2x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the product - data

Pulling Force

Field Strength

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UMH 48x11x65 [M6] / N38 - magnetic holder with hook

Pros and cons of NdFeB magnets.

Maximum lifting force for a neodymium magnet – what it depends on?

Key elements affecting lifting force

H&S for magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C