Product available Ships today (order by 14:00)

MW 55x25 / 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 010081

GTIN/EAN: 5906301810803

5.00

Diameter Ø

55 mm [±0,1 mm]

Height

25 mm [±0,1 mm]

Weight

445.47 g

Magnetization Direction

↑ axial

Load capacity

92.25 kg / 904.94 N

Magnetic Induction

416.97 mT / 4170 Gs

Coating

[NiCuNi] Nickel

154.21 ZŁ with VAT / pcs + price for transport

125.37 ZŁ net + 23% VAT / pcs

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MW 55x25 / N38 - cylindrical magnet

Specification / characteristics MW 55x25 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010081
GTIN/EAN	5906301810803
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	55 mm [±0,1 mm]
Height	25 mm [±0,1 mm]
Weight	445.47 g
Magnetization Direction	↑ axial
Load capacity ~ ?	92.25 kg / 904.94 N
Magnetic Induction ~ ?	416.97 mT / 4170 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 55x25 / 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

Engineering analysis of the assembly - data

These values constitute the result of a mathematical analysis. Values are based on algorithms for the class Nd₂Fe₁₄B. Operational conditions may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 55x25 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4169 Gs 416.9 mT	92.25 kg / 92250.0 g 905.0 N	dangerous!
1 mm	4034 Gs 403.4 mT	86.37 kg / 86369.8 g 847.3 N	dangerous!
2 mm	3894 Gs 389.4 mT	80.47 kg / 80469.7 g 789.4 N	dangerous!
3 mm	3751 Gs 375.1 mT	74.67 kg / 74670.6 g 732.5 N	dangerous!
5 mm	3461 Gs 346.1 mT	63.58 kg / 63580.6 g 623.7 N	dangerous!
10 mm	2756 Gs 275.6 mT	40.32 kg / 40320.8 g 395.5 N	dangerous!
15 mm	2140 Gs 214.0 mT	24.31 kg / 24308.3 g 238.5 N	dangerous!
20 mm	1644 Gs 164.4 mT	14.34 kg / 14338.1 g 140.7 N	dangerous!
30 mm	975 Gs 97.5 mT	5.05 kg / 5046.0 g 49.5 N	strong
50 mm	388 Gs 38.8 mT	0.80 kg / 801.0 g 7.9 N	safe

Grip strength drops significantly with every subsequent millimeter of gap. Note that every additional insulation layer (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Magnetic products hold most effectively at the point of direct contact; air break drastically cuts the power. Notice how flashily the pull force fall, when the magnet does not touch tightly to the metal substrate. When calculating the mounting, avoid redundant distances.

Table 2: Vertical load (vertical surface)
MW 55x25 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	18.45 kg / 18450.0 g 181.0 N
1 mm	Stal (~0.2)	17.27 kg / 17274.0 g 169.5 N
2 mm	Stal (~0.2)	16.09 kg / 16094.0 g 157.9 N
3 mm	Stal (~0.2)	14.93 kg / 14934.0 g 146.5 N
5 mm	Stal (~0.2)	12.72 kg / 12716.0 g 124.7 N
10 mm	Stal (~0.2)	8.06 kg / 8064.0 g 79.1 N
15 mm	Stal (~0.2)	4.86 kg / 4862.0 g 47.7 N
20 mm	Stal (~0.2)	2.87 kg / 2868.0 g 28.1 N
30 mm	Stal (~0.2)	1.01 kg / 1010.0 g 9.9 N
50 mm	Stal (~0.2)	0.16 kg / 160.0 g 1.6 N

This section indicates the estimated holding capacity necessary to initiate the slippage of the magnet downwards on a vertical steel wall (considering typical friction). This parameter is relative to the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 55x25 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	27.68 kg / 27675.0 g 271.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	18.45 kg / 18450.0 g 181.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	9.23 kg / 9225.0 g 90.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	46.13 kg / 46125.0 g 452.5 N

When hanging a holder on a vertical plane (e.g., a board), it you can count on just about 1/5 of its nominal power. Gravity as well as a low friction coefficient mean that products move down faster than they pull off. Planning a hanger? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will slide down under a noticeably lighter cargo. Application of an anti-slip coating can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 55x25 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	3.08 kg / 3075.0 g 30.2 N
1 mm	8%	7.69 kg / 7687.5 g 75.4 N
2 mm	17%	15.37 kg / 15375.0 g 150.8 N
5 mm	42%	38.44 kg / 38437.5 g 377.1 N
10 mm	83%	76.88 kg / 76875.0 g 754.1 N

A thin sheet is unable to focus the entire magnetic field, which weakens actual performance of the holder. If you install a neodymium to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the product shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MW 55x25 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	92.25 kg / 92250.0 g 905.0 N	OK
40 °C	-2.2%	90.22 kg / 90220.5 g 885.1 N	OK
60 °C	-4.4%	88.19 kg / 88191.0 g 865.2 N
80 °C	-6.6%	86.16 kg / 86161.5 g 845.2 N
100 °C	-28.8%	65.68 kg / 65682.0 g 644.3 N

Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Protect against heat – high temperature can permanently destroy this product. With increasing heat, the magnet's force temporarily decreases. Avoid using this magnet close to ovens exceeding its operating temperature limit. Too high temperature will lead to permanent loss of magnetic properties.

*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (pancake types) risk losing magnetic properties sooner compared to rod magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 55x25 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	254.60 kg / 254602 g 2497.6 N 5 431 Gs	N/A
1 mm	246.57 kg / 246567 g 2418.8 N 8 206 Gs	221.91 kg / 221911 g 2176.9 N ~0 Gs
2 mm	238.37 kg / 238373 g 2338.4 N 8 068 Gs	214.54 kg / 214536 g 2104.6 N ~0 Gs
3 mm	230.21 kg / 230207 g 2258.3 N 7 929 Gs	207.19 kg / 207186 g 2032.5 N ~0 Gs
5 mm	214.04 kg / 214042 g 2099.8 N 7 645 Gs	192.64 kg / 192638 g 1889.8 N ~0 Gs
10 mm	175.48 kg / 175477 g 1721.4 N 6 923 Gs	157.93 kg / 157929 g 1549.3 N ~0 Gs
20 mm	111.28 kg / 111282 g 1091.7 N 5 513 Gs	100.15 kg / 100154 g 982.5 N ~0 Gs
50 mm	23.33 kg / 23326 g 228.8 N 2 524 Gs	20.99 kg / 20994 g 205.9 N ~0 Gs

Two magnetic products attract each other from a significantly greater distance than a neodymium and metal combination. The connection of two magnets generates a stronger field and a further horizon of action. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The levitation is a bit weaker than the attraction, but still impressive.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).

Table 7: Protective zones (implants) - precautionary measures
MW 55x25 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	27.5 cm
Hearing aid	10 Gs (1.0 mT)	21.5 cm
Mechanical watch	20 Gs (2.0 mT)	17.0 cm
Mobile device	40 Gs (4.0 mT)	13.0 cm
Remote	50 Gs (5.0 mT)	12.0 cm
Payment card	400 Gs (40.0 mT)	5.0 cm
HDD hard drive	600 Gs (60.0 mT)	4.5 cm

Powerful magnet radiation poses a real danger to electronic devices and medical implants. These magnets produce a flux that destroys function of digital equipment. Remember: the unseen radiation passes through tissues and plastic. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MW 55x25 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	18.05 km/h (5.01 m/s)	5.60 J
30 mm	25.98 km/h (7.22 m/s)	11.60 J
50 mm	32.63 km/h (9.06 m/s)	18.30 J
100 mm	45.90 km/h (12.75 m/s)	36.21 J

NdFeB products are delicate – a strong collision with metal can result in shattering. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
MW 55x25 / 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (P_c)
MW 55x25 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	101 075 Mx	1010.7 µWb
P_c Coefficient	0.55	Low (Flat)

Total magnetic flux emitted by the pole surface. Key data when building generators and motors. The P_c coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MW 55x25 / N38

Environment	Effective steel pull	Effect
Air (land)	92.25 kg	Standard
Water (riverbed)	105.63 kg (+13.38 kg Buoyancy gain)	+14.5%

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. However, remember the water resistance when pulling the rope quickly.

1. Sliding resistance

*Note: On a vertical surface, the magnet retains just ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Temperature resistance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.55

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 and environmental data

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: 010081-2025

Measurement Calculator

Force (pull)

Kilograms (kg)

lbs

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Gauss (Gs)

Tesla (T)

Input a figure in just one field to see the conversion for the other fields immediately.

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The offered product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø55x25 mm, guarantees the highest energy density. The MW 55x25 / N38 component features high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 92.25 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 904.94 N with a weight of only 445.47 g, this rod is indispensable in electronics and wherever low weight is crucial.

Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.

Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø55x25), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

The presented product is a neodymium magnet with precisely defined parameters: diameter 55 mm and height 25 mm. The key parameter here is the lifting capacity amounting to approximately 92.25 kg (force ~904.94 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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 55 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 diametrically if your project requires it.

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.

Benefits

Besides their remarkable field intensity, neodymium magnets offer the following advantages:

They do not lose magnetism, even over nearly 10 years – the reduction in strength is only ~1% (based on measurements),
They possess excellent resistance to magnetism drop due to opposing magnetic fields,
By covering with a lustrous layer of gold, the element gains an elegant look,
Magnets have impressive magnetic induction on the active area,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
Possibility of individual forming as well as modifying to precise requirements,
Significant place in innovative solutions – they are commonly used in data components, motor assemblies, medical equipment, as well as other advanced devices.
Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Cons of neodymium magnets and proposals for their use:

Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
Due to limitations in realizing threads and complex forms in magnets, we propose using a housing - magnetic mount.
Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, tiny parts of these magnets can complicate diagnosis medical after entering the body.
Due to neodymium price, their price is higher than average,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what affects it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:

with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
possessing a thickness of minimum 10 mm to avoid saturation
with an ideally smooth contact surface
under conditions of ideal adhesion (surface-to-surface)
during pulling in a direction vertical to the plane
in neutral thermal conditions

What influences lifting capacity in practice

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

Distance (between the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
Angle of force application – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be escaped to the other side.
Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Warnings

Protect data

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Compass and GPS

Navigation devices and smartphones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Powerful field

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

Mechanical processing

Powder generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Warning for heart patients

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Finger safety

Pinching hazard: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Nickel coating and allergies

Some people suffer from a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause skin redness. We strongly advise wear protective gloves.

Do not overheat magnets

Do not overheat. NdFeB magnets are susceptible to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Shattering risk

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.

Product not for children

NdFeB magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them attracting across intestines, which constitutes a severe health hazard and requires immediate surgery.

Danger! Want to know more? Check our post: Are neodymium magnets dangerous?

MW 55x25 / N38 - cylindrical magnet

Not sure what to buy?

MW 55x25 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the assembly - data

1. Sliding resistance

2. Efficiency vs thickness

3. Temperature resistance

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

Material specification

Ecology and recycling (GPSR)

Force (pull)

Field Strength

Other products

MW 45x15 / N38 - cylindrical magnet

SM 18x125 [2xM5] / N42 - magnetic separator

MW 10x1.5 / N38 - cylindrical magnet

MT 50x1.5x50000 - magnetic tape

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Weaknesses

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what affects it?

What influences lifting capacity in practice

Protect data

Compass and GPS

Powerful field

Mechanical processing

Warning for heart patients

Finger safety

Nickel coating and allergies

Do not overheat magnets

Shattering risk

Product not for children

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.