Product available Ships tomorrow

MW 16x4 / 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: PLN 1-6500
Rating: 5

cylindrical magnet

Catalog no 010034

GTIN/EAN: 5906301810339

5.00

Diameter Ø

16 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

6.03 g

Magnetization Direction

↑ axial

Load capacity

4.43 kg / 43.46 N

Magnetic Induction

277.14 mT / 2771 Gs

Coating

[NiCuNi] Nickel

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3.39 ZŁ with VAT / pcs + price for transport

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Product card - MW 16x4 / N38 - cylindrical magnet

Specification / characteristics - MW 16x4 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010034
GTIN/EAN	5906301810339
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	16 mm [±0,1 mm]
Height	4 mm [±0,1 mm]
Weight	6.03 g
Magnetization Direction	↑ axial
Load capacity ~ ?	4.43 kg / 43.46 N
Magnetic Induction ~ ?	277.14 mT / 2771 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 16x4 / 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

Technical modeling of the magnet - report

These values are the direct effect of a physical simulation. Values were calculated on algorithms for the class Nd₂Fe₁₄B. Actual conditions may differ. Treat these data as a reference point for designers.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 16x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2771 Gs 277.1 mT	4.43 kg / 4430.0 g 43.5 N	medium risk
1 mm	2517 Gs 251.7 mT	3.66 kg / 3656.3 g 35.9 N	medium risk
2 mm	2216 Gs 221.6 mT	2.83 kg / 2834.9 g 27.8 N	medium risk
3 mm	1906 Gs 190.6 mT	2.10 kg / 2096.1 g 20.6 N	medium risk
5 mm	1348 Gs 134.8 mT	1.05 kg / 1048.6 g 10.3 N	weak grip
10 mm	542 Gs 54.2 mT	0.17 kg / 169.4 g 1.7 N	weak grip
15 mm	244 Gs 24.4 mT	0.03 kg / 34.2 g 0.3 N	weak grip
20 mm	125 Gs 12.5 mT	0.01 kg / 9.1 g 0.1 N	weak grip
30 mm	45 Gs 4.5 mT	0.00 kg / 1.1 g 0.0 N	weak grip
50 mm	11 Gs 1.1 mT	0.00 kg / 0.1 g 0.0 N	weak grip

Grip strength drops drastically with every subsequent millimeter of gap. Note that even the smallest gap (e.g., dirt, paint, rust) strongly weakens the grip. Neodymiums work strongest in perfect adhesion; air break kills the power. See how rapidly the load capacity fall, when the product does not touch directly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Vertical capacity (vertical surface)
MW 16x4 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.89 kg / 886.0 g 8.7 N
1 mm	Stal (~0.2)	0.73 kg / 732.0 g 7.2 N
2 mm	Stal (~0.2)	0.57 kg / 566.0 g 5.6 N
3 mm	Stal (~0.2)	0.42 kg / 420.0 g 4.1 N
5 mm	Stal (~0.2)	0.21 kg / 210.0 g 2.1 N
10 mm	Stal (~0.2)	0.03 kg / 34.0 g 0.3 N
15 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
20 mm	Stal (~0.2)	0.00 kg / 2.0 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 calculates the theoretical weight limit necessary to start the sliding of the magnet downwards against a vertical steel plate (considering standard friction coefficient). This value is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MW 16x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.33 kg / 1329.0 g 13.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.89 kg / 886.0 g 8.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.44 kg / 443.0 g 4.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.22 kg / 2215.0 g 21.7 N

When hanging a holder on a upright wall (e.g., a car body), it you can count on only approx. 1/5 of its nominal power. Gravitational force and a low friction coefficient cause that products slip faster than they pull off. Planning a hanger? Note that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will slide down under a significantly smaller weight. Application of an anti-slip layer can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 16x4 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.44 kg / 443.0 g 4.3 N
1 mm	25%	1.11 kg / 1107.5 g 10.9 N
2 mm	50%	2.22 kg / 2215.0 g 21.7 N
5 mm	100%	4.43 kg / 4430.0 g 43.5 N
10 mm	100%	4.43 kg / 4430.0 g 43.5 N

A thin sheet is incapable of absorb the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze the maximum of this magnet's power, you require a sufficiently solid backing of steel. The material oversaturation causes that on thin elements (e.g., appliance housings), the product holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Working in heat (stability) - power drop
MW 16x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	4.43 kg / 4430.0 g 43.5 N	OK
40 °C	-2.2%	4.33 kg / 4332.5 g 42.5 N	OK
60 °C	-4.4%	4.24 kg / 4235.1 g 41.5 N
80 °C	-6.6%	4.14 kg / 4137.6 g 40.6 N
100 °C	-28.8%	3.15 kg / 3154.2 g 30.9 N

Standard neodymium magnets irreversibly lose power past the thermal threshold. Watch out for overheating – excessive heat can permanently demagnetize this magnet. With every degree above norm, the neodymium's force momentarily decreases. Avoid using this magnet close to ovens higher than its working range. Too high temperature will result in irreversible degradation of magnetism.

*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MW 16x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	9.51 kg / 9514 g 93.3 N 4 379 Gs	N/A
1 mm	8.72 kg / 8724 g 85.6 N 5 306 Gs	7.85 kg / 7851 g 77.0 N ~0 Gs
2 mm	7.85 kg / 7853 g 77.0 N 5 034 Gs	7.07 kg / 7068 g 69.3 N ~0 Gs
3 mm	6.96 kg / 6962 g 68.3 N 4 740 Gs	6.27 kg / 6266 g 61.5 N ~0 Gs
5 mm	5.26 kg / 5262 g 51.6 N 4 121 Gs	4.74 kg / 4736 g 46.5 N ~0 Gs
10 mm	2.25 kg / 2252 g 22.1 N 2 696 Gs	2.03 kg / 2027 g 19.9 N ~0 Gs
20 mm	0.36 kg / 364 g 3.6 N 1 083 Gs	0.33 kg / 327 g 3.2 N ~0 Gs
50 mm	0.01 kg / 6 g 0.1 N 143 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets attract each other from a wider radius than a neodymium and metal combination. Such a system of magnet-to-magnet generates a stronger field and a wider radius of action. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is massive. The levitation is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).

Table 7: Safety (HSE) (electronics) - warnings
MW 16x4 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	7.0 cm
Hearing aid	10 Gs (1.0 mT)	5.5 cm
Mechanical watch	20 Gs (2.0 mT)	4.5 cm
Mobile device	40 Gs (4.0 mT)	3.5 cm
Remote	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation poses a large risk to electronics and pacemakers. These magnets generate a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MW 16x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	27.98 km/h (7.77 m/s)	0.18 J
30 mm	47.35 km/h (13.15 m/s)	0.52 J
50 mm	61.12 km/h (16.98 m/s)	0.87 J
100 mm	86.44 km/h (24.01 m/s)	1.74 J

Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MW 16x4 / 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)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (P_c)
MW 16x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	6 192 Mx	61.9 µWb
P_c Coefficient	0.35	Low (Flat)

Total magnetic flux emitted by the magnet pole. Key data in coil applications and motors. P_c value defines the working geometry.

Table 11: Physics of underwater searching
MW 16x4 / N38

Environment	Effective steel pull	Effect
Air (land)	4.43 kg	Standard
Water (riverbed)	5.07 kg (+0.64 kg Buoyancy gain)	+14.5%

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

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Note: On a vertical surface, the magnet retains just a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.35

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.

Engineering data and GPSR

Elemental analysis

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%

Sustainability

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: 010034-2025

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The presented product is a very strong cylinder magnet, produced from modern NdFeB material, which, with dimensions of Ø16x4 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 4.43 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is created for building generators, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 43.46 N with a weight of only 6.03 g, this cylindrical magnet is indispensable in electronics 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 stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Magnets NdFeB grade N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø16x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.

This model is characterized by dimensions Ø16x4 mm, which, at a weight of 6.03 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 4.43 kg (force ~43.46 N), which, with such compact dimensions, proves the high power 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 16 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths and weaknesses of neodymium magnets.

Strengths

Apart from their superior magnetism, neodymium magnets have these key benefits:

Their strength remains stable, and after around ten years it drops only by ~1% (according to research),
They possess excellent resistance to magnetism drop when exposed to external magnetic sources,
A magnet with a smooth nickel surface has an effective appearance,
Magnetic induction on the surface of the magnet is strong,
Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
Thanks to flexibility in designing and the capacity to adapt to individual projects,
Versatile presence in modern industrial fields – they are utilized in hard drives, electric drive systems, medical devices, as well as other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Weaknesses

What to avoid - cons of neodymium magnets and ways of using them

They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
Limited possibility of producing nuts in the magnet and complicated forms - recommended is casing - magnetic holder.
Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can complicate diagnosis medical in case of swallowing.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result conducted under standard conditions:

with the use of a sheet made of special test steel, guaranteeing maximum field concentration
whose transverse dimension reaches at least 10 mm
with an ground contact surface
with direct contact (without coatings)
during detachment in a direction vertical to the mounting surface
at standard ambient temperature

Lifting capacity in real conditions – factors

Please note that the working load will differ influenced by the following factors, in order of importance:

Distance – the presence of foreign body (paint, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
Base smoothness – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
Thermal conditions – 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 testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Warnings

Magnetic interference

An intense magnetic field disrupts the functioning of compasses in smartphones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.

Choking Hazard

These products are not toys. Eating a few magnets can lead to them connecting inside the digestive tract, which poses a critical condition and requires immediate surgery.

Handling rules

Exercise caution. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can move away.

Electronic devices

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Dust explosion hazard

Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Maximum temperature

Keep cool. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Medical implants

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Crushing force

Danger of trauma: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Sensitization to coating

Studies show that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and select coated magnets.

Magnet fragility

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

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

MW 16x4 / N38 - cylindrical magnet

Product card - MW 16x4 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - report

Table 1: Static pull force (pull vs gap) - interaction chart MW 16x4 / N38

Table 2: Vertical capacity (vertical surface) MW 16x4 / N38

Table 3: Vertical assembly (sliding) - vertical pull MW 16x4 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 16x4 / N38

Table 5: Working in heat (stability) - power drop MW 16x4 / N38

Table 6: Two magnets (attraction) - forces in the system MW 16x4 / N38

Table 7: Safety (HSE) (electronics) - warnings MW 16x4 / N38

Table 8: Dynamics (kinetic energy) - warning MW 16x4 / N38

Table 9: Surface protection spec MW 16x4 / N38

Table 10: Electrical data (Pc) MW 16x4 / N38

Table 11: Physics of underwater searching MW 16x4 / N38

1. Wall mount (shear)

2. Efficiency vs thickness

3. Heat tolerance

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

Elemental analysis

Sustainability

Pulling force

Magnetic Field

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Strengths and weaknesses of neodymium magnets.

Strengths

Weaknesses

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Lifting capacity in real conditions – factors

Warnings

Magnetic interference

Choking Hazard

Handling rules

Electronic devices

Dust explosion hazard

Maximum temperature

Medical implants

Crushing force

Sensitization to coating

Magnet fragility

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - interaction chart
MW 16x4 / N38

Table 2: Vertical capacity (vertical surface)
MW 16x4 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MW 16x4 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 16x4 / N38

Table 5: Working in heat (stability) - power drop
MW 16x4 / N38

Table 6: Two magnets (attraction) - forces in the system
MW 16x4 / N38

Table 7: Safety (HSE) (electronics) - warnings
MW 16x4 / N38

Table 8: Dynamics (kinetic energy) - warning
MW 16x4 / N38

Table 9: Surface protection spec
MW 16x4 / N38

Table 10: Electrical data (P_c)
MW 16x4 / N38

Table 11: Physics of underwater searching
MW 16x4 / N38