Product available Ships today (order by 14:00)

MW 25x12 / 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 010502

GTIN/EAN: 5906301814986

5.00

Diameter Ø

25 mm [±0,1 mm]

Height

12 mm [±0,1 mm]

Weight

44.18 g

Magnetization Direction

↑ axial

Load capacity

19.60 kg / 192.25 N

Magnetic Induction

429.18 mT / 4292 Gs

Coating

[NiCuNi] Nickel

view specifications »

16.64 ZŁ with VAT / pcs + price for transport

13.53 ZŁ net + 23% VAT / pcs

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Technical details - MW 25x12 / N38 - cylindrical magnet

Specification / characteristics - MW 25x12 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010502
GTIN/EAN	5906301814986
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	25 mm [±0,1 mm]
Height	12 mm [±0,1 mm]
Weight	44.18 g
Magnetization Direction	↑ axial
Load capacity ~ ?	19.60 kg / 192.25 N
Magnetic Induction ~ ?	429.18 mT / 4292 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 25x12 / 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 simulation of the assembly - data

Presented values are the result of a physical simulation. Results rely on models for the class Nd₂Fe₁₄B. Actual parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide for designers.

Table 1: Static force (force vs gap) - interaction chart
MW 25x12 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4291 Gs 429.1 mT	19.60 kg / 19600.0 g 192.3 N	dangerous!
1 mm	3975 Gs 397.5 mT	16.82 kg / 16820.5 g 165.0 N	dangerous!
2 mm	3645 Gs 364.5 mT	14.15 kg / 14147.5 g 138.8 N	dangerous!
3 mm	3316 Gs 331.6 mT	11.71 kg / 11707.5 g 114.9 N	dangerous!
5 mm	2692 Gs 269.2 mT	7.72 kg / 7718.0 g 75.7 N	strong
10 mm	1518 Gs 151.8 mT	2.45 kg / 2451.8 g 24.1 N	strong
15 mm	863 Gs 86.3 mT	0.79 kg / 793.5 g 7.8 N	safe
20 mm	517 Gs 51.7 mT	0.29 kg / 285.1 g 2.8 N	safe
30 mm	219 Gs 21.9 mT	0.05 kg / 51.2 g 0.5 N	safe
50 mm	63 Gs 6.3 mT	0.00 kg / 4.2 g 0.0 N	safe

Magnetic force weakens sharply with every subsequent millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, dust) strongly diminishes the holding power. Magnetic products hold optimally at the point of direct contact; gap weakens the power. Analyze how flashily the load capacity drop, when the magnet does not touch tightly to the steel surface. When planning the mounting, avoid unnecessary gaps.

Table 2: Slippage capacity (vertical surface)
MW 25x12 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	3.92 kg / 3920.0 g 38.5 N
1 mm	Stal (~0.2)	3.36 kg / 3364.0 g 33.0 N
2 mm	Stal (~0.2)	2.83 kg / 2830.0 g 27.8 N
3 mm	Stal (~0.2)	2.34 kg / 2342.0 g 23.0 N
5 mm	Stal (~0.2)	1.54 kg / 1544.0 g 15.1 N
10 mm	Stal (~0.2)	0.49 kg / 490.0 g 4.8 N
15 mm	Stal (~0.2)	0.16 kg / 158.0 g 1.5 N
20 mm	Stal (~0.2)	0.06 kg / 58.0 g 0.6 N
30 mm	Stal (~0.2)	0.01 kg / 10.0 g 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below calculates the theoretical holding capacity sufficient to initiate the shifting of the magnet vertically along a upright metal surface (assuming typical friction coefficient). The holding force varies with the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MW 25x12 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	5.88 kg / 5880.0 g 57.7 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.92 kg / 3920.0 g 38.5 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.96 kg / 1960.0 g 19.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	9.80 kg / 9800.0 g 96.1 N

When placing a magnet on a vertical surface (e.g., a board), it you can count on only about 1/5 of its maximum pull force. Gravity and a weak degree of grip cause that products slip faster than they pull off. Designing a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the element will give way down under a noticeably lighter weight. Using a rubber pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - power losses
MW 25x12 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.98 kg / 980.0 g 9.6 N
1 mm	13%	2.45 kg / 2450.0 g 24.0 N
2 mm	25%	4.90 kg / 4900.0 g 48.1 N
5 mm	63%	12.25 kg / 12250.0 g 120.2 N
10 mm	100%	19.60 kg / 19600.0 g 192.3 N

A thin metal plate is incapable of conduct the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (stability) - resistance threshold
MW 25x12 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	19.60 kg / 19600.0 g 192.3 N	OK
40 °C	-2.2%	19.17 kg / 19168.8 g 188.0 N	OK
60 °C	-4.4%	18.74 kg / 18737.6 g 183.8 N
80 °C	-6.6%	18.31 kg / 18306.4 g 179.6 N
100 °C	-28.8%	13.96 kg / 13955.2 g 136.9 N

Ordinary NdFeB products lose strength after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly damage this magnet. As the temperature rises, the magnet's capacity momentarily decreases. Do not use this magnet near heat sources higher than its safe range. Exceeding the critical threshold will result in permanent loss of magnetic properties.

*Important note: Temperature resistance is determined by both grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MW 25x12 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	55.71 kg / 55711 g 546.5 N 5 494 Gs	N/A
1 mm	51.78 kg / 51775 g 507.9 N 8 273 Gs	46.60 kg / 46598 g 457.1 N ~0 Gs
2 mm	47.81 kg / 47810 g 469.0 N 7 949 Gs	43.03 kg / 43029 g 422.1 N ~0 Gs
3 mm	43.94 kg / 43944 g 431.1 N 7 621 Gs	39.55 kg / 39549 g 388.0 N ~0 Gs
5 mm	36.65 kg / 36650 g 359.5 N 6 960 Gs	32.98 kg / 32985 g 323.6 N ~0 Gs
10 mm	21.94 kg / 21938 g 215.2 N 5 385 Gs	19.74 kg / 19744 g 193.7 N ~0 Gs
20 mm	6.97 kg / 6969 g 68.4 N 3 035 Gs	6.27 kg / 6272 g 61.5 N ~0 Gs
50 mm	0.33 kg / 326 g 3.2 N 657 Gs	0.29 kg / 294 g 2.9 N ~0 Gs

Two magnets attract each other from a much further distance than a neodymium and metal combination. The setup of two magnets produces a massive flux and a further horizon of action. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The repulsion force is a bit weaker than the attraction, but still impressive.
*The magnetic induction for N-N configuration reaches ~0 Gs in the exact middle of the gap (due to field cancellation).

Table 7: Hazards (electronics) - warnings
MW 25x12 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	13.0 cm
Hearing aid	10 Gs (1.0 mT)	10.0 cm
Mechanical watch	20 Gs (2.0 mT)	8.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	6.0 cm
Remote	50 Gs (5.0 mT)	5.5 cm
Payment card	400 Gs (40.0 mT)	2.5 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

Powerful magnet radiation poses a real danger to electronics and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 25x12 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.84 km/h (6.35 m/s)	0.89 J
30 mm	36.85 km/h (10.24 m/s)	2.31 J
50 mm	47.51 km/h (13.20 m/s)	3.85 J
100 mm	67.17 km/h (18.66 m/s)	7.69 J

Magnetic elements are delicate – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Corrosion resistance
MW 25x12 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (P_c)
MW 25x12 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	21 413 Mx	214.1 µWb
P_c Coefficient	0.57	Low (Flat)

Flux value emitted by the pole surface. Essential parameter for generator designers as well as sensors. The P_c coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
MW 25x12 / N38

Environment	Effective steel pull	Effect
Air (land)	19.60 kg	Standard
Water (riverbed)	22.44 kg (+2.84 kg Buoyancy gain)	+14.5%

Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

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. Shear force

*Caution: On a vertical surface, the magnet holds merely ~20% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Heat tolerance

*For N38 material, 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) = 0.57

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

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%

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: 010502-2025

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The offered product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø25x12 mm, guarantees optimal power. The MW 25x12 / N38 model features a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 19.60 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is created for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 192.25 N with a weight of only 44.18 g, this rod is indispensable in electronics and wherever every gram matters.

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., 25.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Magnets N38 are strong enough for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø25x12), 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 25 mm and height 12 mm. The value of 192.25 N means that the magnet is capable of holding a weight many times exceeding its own mass of 44.18 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.

This rod magnet is magnetized axially (along the height of 12 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard 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.

Advantages and disadvantages of neodymium magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:

They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
By using a shiny coating of gold, the element has an elegant look,
Magnets possess excellent magnetic induction on the working surface,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
In view of the ability of accurate molding and customization to unique requirements, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which makes them more universal,
Key role in future technologies – they are commonly used in magnetic memories, electric drive systems, medical devices, as well as industrial machines.
Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of NdFeB magnets:

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
Neodymium magnets decrease 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 durability even at temperatures up to 230°C
They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
Health risk resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Highest magnetic holding force – what contributes to it?

Holding force of 19.60 kg is a measurement result conducted under specific, ideal conditions:

with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
whose thickness is min. 10 mm
characterized by even structure
without the slightest air gap between the magnet and steel
under perpendicular force direction (90-degree angle)
at conditions approx. 20°C

Determinants of practical lifting force of a magnet

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

Air gap (betwixt the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets

Finger safety

Pinching hazard: The pulling power is so immense that it can cause hematomas, crushing, and broken bones. Use thick gloves.

Choking Hazard

NdFeB magnets are not intended for children. Accidental ingestion of a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires immediate surgery.

Shattering risk

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Warning for heart patients

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.

Data carriers

Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Impact on smartphones

Be aware: rare earth magnets generate a field that disrupts precision electronics. Keep a safe distance from your mobile, device, and GPS.

Demagnetization risk

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Combustion hazard

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Allergy Warning

Medical facts indicate that nickel (the usual finish) is a strong allergen. For allergy sufferers, refrain from touching magnets with bare hands and select coated magnets.

Safe operation

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

Attention! Learn more about hazards in the article: Safety of working with magnets.

MW 25x12 / N38 - cylindrical magnet

Technical details - MW 25x12 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the assembly - data

Table 1: Static force (force vs gap) - interaction chart MW 25x12 / N38

Table 2: Slippage capacity (vertical surface) MW 25x12 / N38

Table 3: Wall mounting (sliding) - vertical pull MW 25x12 / N38

Table 4: Material efficiency (saturation) - power losses MW 25x12 / N38

Table 5: Working in heat (stability) - resistance threshold MW 25x12 / N38

Table 6: Two magnets (repulsion) - forces in the system MW 25x12 / N38

Table 7: Hazards (electronics) - warnings MW 25x12 / N38

Table 8: Collisions (cracking risk) - collision effects MW 25x12 / N38

Table 9: Corrosion resistance MW 25x12 / N38

Table 10: Electrical data (Pc) MW 25x12 / N38

Table 11: Physics of underwater searching MW 25x12 / N38

1. Shear force

2. Steel saturation

3. Heat tolerance

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

Elemental analysis

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Field

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Advantages and disadvantages of neodymium magnets.

Advantages

Disadvantages

Pull force analysis

Highest magnetic holding force – what contributes to it?

Determinants of practical lifting force of a magnet

Safety rules for work with NdFeB magnets

Finger safety

Choking Hazard

Shattering risk

Warning for heart patients

Data carriers

Impact on smartphones

Demagnetization risk

Combustion hazard

Allergy Warning

Safe operation

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - interaction chart
MW 25x12 / N38

Table 2: Slippage capacity (vertical surface)
MW 25x12 / N38

Table 3: Wall mounting (sliding) - vertical pull
MW 25x12 / N38

Table 4: Material efficiency (saturation) - power losses
MW 25x12 / N38

Table 5: Working in heat (stability) - resistance threshold
MW 25x12 / N38

Table 6: Two magnets (repulsion) - forces in the system
MW 25x12 / N38

Table 7: Hazards (electronics) - warnings
MW 25x12 / N38

Table 8: Collisions (cracking risk) - collision effects
MW 25x12 / N38

Table 9: Corrosion resistance
MW 25x12 / N38

Table 10: Electrical data (P_c)
MW 25x12 / N38

Table 11: Physics of underwater searching
MW 25x12 / N38