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MW 40x30 / 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 010068

GTIN/EAN: 5906301810674

5.00

Diameter Ø

40 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

282.74 g

Magnetization Direction

→ diametrical

Load capacity

54.73 kg / 536.88 N

Magnetic Induction

515.71 mT / 5157 Gs

Coating

[NiCuNi] Nickel

view parameters »

104.80 ZŁ with VAT / pcs + price for transport

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Technical parameters - MW 40x30 / N38 - cylindrical magnet

Specification / characteristics - MW 40x30 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010068
GTIN/EAN	5906301810674
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	40 mm [±0,1 mm]
Height	30 mm [±0,1 mm]
Weight	282.74 g
Magnetization Direction	→ diametrical
Load capacity ~ ?	54.73 kg / 536.88 N
Magnetic Induction ~ ?	515.71 mT / 5157 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x30 / 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 assembly - data

The following values are the result of a physical simulation. Results are based on algorithms for the class Nd₂Fe₁₄B. Real-world parameters may deviate from the simulation results. Treat these data as a reference point for designers.

Table 1: Static force (pull vs gap) - interaction chart
MW 40x30 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5156 Gs 515.6 mT	54.73 kg / 54730.0 g 536.9 N	dangerous!
1 mm	4900 Gs 490.0 mT	49.43 kg / 49432.0 g 484.9 N	dangerous!
2 mm	4641 Gs 464.1 mT	44.33 kg / 44334.0 g 434.9 N	dangerous!
3 mm	4383 Gs 438.3 mT	39.54 kg / 39538.7 g 387.9 N	dangerous!
5 mm	3879 Gs 387.9 mT	30.98 kg / 30981.5 g 303.9 N	dangerous!
10 mm	2773 Gs 277.3 mT	15.83 kg / 15826.7 g 155.3 N	dangerous!
15 mm	1946 Gs 194.6 mT	7.79 kg / 7792.9 g 76.4 N	strong
20 mm	1372 Gs 137.2 mT	3.88 kg / 3877.9 g 38.0 N	strong
30 mm	723 Gs 72.3 mT	1.08 kg / 1076.5 g 10.6 N	safe
50 mm	258 Gs 25.8 mT	0.14 kg / 137.4 g 1.3 N	safe

Magnetic force decreases significantly with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., contamination, paint, rust) strongly weakens the grip. Neodymiums operate most effectively during direct contact; air break nullifies the force. Analyze how rapidly the pull force drop, when the magnet does not touch directly to the steel surface. When designing the assembly, avoid unnecessary gaps.

Table 2: Vertical hold (wall)
MW 40x30 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	10.95 kg / 10946.0 g 107.4 N
1 mm	Stal (~0.2)	9.89 kg / 9886.0 g 97.0 N
2 mm	Stal (~0.2)	8.87 kg / 8866.0 g 87.0 N
3 mm	Stal (~0.2)	7.91 kg / 7908.0 g 77.6 N
5 mm	Stal (~0.2)	6.20 kg / 6196.0 g 60.8 N
10 mm	Stal (~0.2)	3.17 kg / 3166.0 g 31.1 N
15 mm	Stal (~0.2)	1.56 kg / 1558.0 g 15.3 N
20 mm	Stal (~0.2)	0.78 kg / 776.0 g 7.6 N
30 mm	Stal (~0.2)	0.22 kg / 216.0 g 2.1 N
50 mm	Stal (~0.2)	0.03 kg / 28.0 g 0.3 N

The following data defines the theoretical weight limit needed to initiate the sliding of the magnet downwards on a upright metal surface (assuming standard friction). This value depends on the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MW 40x30 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	16.42 kg / 16419.0 g 161.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	10.95 kg / 10946.0 g 107.4 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	5.47 kg / 5473.0 g 53.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	27.37 kg / 27365.0 g 268.5 N

When placing a magnet on a upright surface (e.g., a fridge), it will maintain only about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient cause that products move down easier than they pop off the substrate. Planning a vertical fastening? Consider that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will slide down under a much lighter weight. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Material efficiency (saturation) - power losses
MW 40x30 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	1.82 kg / 1824.3 g 17.9 N
1 mm	8%	4.56 kg / 4560.8 g 44.7 N
2 mm	17%	9.12 kg / 9121.7 g 89.5 N
5 mm	42%	22.80 kg / 22804.2 g 223.7 N
10 mm	83%	45.61 kg / 45608.3 g 447.4 N

A too thin steel cannot focus the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the magnetism will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick element of steel. The saturation phenomenon causes that on thin elements (e.g., car bodies), the holder shows lower pull force. We advise picking the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MW 40x30 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	54.73 kg / 54730.0 g 536.9 N	OK
40 °C	-2.2%	53.53 kg / 53525.9 g 525.1 N	OK
60 °C	-4.4%	52.32 kg / 52321.9 g 513.3 N	OK
80 °C	-6.6%	51.12 kg / 51117.8 g 501.5 N
100 °C	-28.8%	38.97 kg / 38967.8 g 382.3 N

Standard neodymium magnets change their properties power above the temperature limit. Protect against heat – heat can permanently destroy this magnet. As the temperature rises, the neodymium's capacity temporarily drops. Avoid using this product near heat sources higher than its operating temperature limit. Ignoring the limit will result in irreversible degradation of magnetism.

*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MW 40x30 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	205.97 kg / 205965 g 2020.5 N 5 879 Gs	N/A
1 mm	195.99 kg / 195993 g 1922.7 N 10 060 Gs	176.39 kg / 176393 g 1730.4 N ~0 Gs
2 mm	186.03 kg / 186027 g 1824.9 N 9 800 Gs	167.42 kg / 167425 g 1642.4 N ~0 Gs
3 mm	176.30 kg / 176302 g 1729.5 N 9 541 Gs	158.67 kg / 158672 g 1556.6 N ~0 Gs
5 mm	157.67 kg / 157667 g 1546.7 N 9 023 Gs	141.90 kg / 141901 g 1392.0 N ~0 Gs
10 mm	116.59 kg / 116593 g 1143.8 N 7 759 Gs	104.93 kg / 104933 g 1029.4 N ~0 Gs
20 mm	59.56 kg / 59560 g 584.3 N 5 545 Gs	53.60 kg / 53604 g 525.9 N ~0 Gs
50 mm	7.52 kg / 7522 g 73.8 N 1 971 Gs	6.77 kg / 6769 g 66.4 N ~0 Gs

Two strong neodymiums interact from a much further distance than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a larger range of action. Planning to create a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is extreme. The levitation is marginally weaker than the connection force, but still large.
*Flux density between like poles drops to ~0 Gs in the exact middle of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - warnings
MW 40x30 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	23.5 cm
Hearing aid	10 Gs (1.0 mT)	18.0 cm
Mechanical watch	20 Gs (2.0 mT)	14.0 cm
Mobile device	40 Gs (4.0 mT)	11.0 cm
Car key	50 Gs (5.0 mT)	10.0 cm
Payment card	400 Gs (40.0 mT)	4.5 cm
HDD hard drive	600 Gs (60.0 mT)	3.5 cm

A strong magnetic field poses a large risk to electronics and pacemakers. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MW 40x30 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	16.37 km/h (4.55 m/s)	2.92 J
30 mm	24.60 km/h (6.83 m/s)	6.60 J
50 mm	31.42 km/h (8.73 m/s)	10.77 J
100 mm	44.37 km/h (12.33 m/s)	21.48 J

Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to fingers. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MW 40x30 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 40x30 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	65 488 Mx	654.9 µWb
P_c Coefficient	0.76	High (Stable)

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

Table 11: Underwater work (magnet fishing)
MW 40x30 / N38

Environment	Effective steel pull	Effect
Air (land)	54.73 kg	Standard
Water (riverbed)	62.67 kg (+7.94 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!

Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Note: On a vertical wall, the magnet holds just ~20% of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.76

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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

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%

Environmental data

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: 010068-2025

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The offered product is an incredibly powerful cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø40x30 mm, guarantees maximum efficiency. The MW 40x30 / N38 component is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 54.73 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 536.88 N with a weight of only 282.74 g, this rod is indispensable in electronics and wherever low weight is crucial.

Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Magnets N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø40x30), 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 Ø40x30 mm, which, at a weight of 282.74 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 54.73 kg (force ~536.88 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 oxidation, 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 40 mm. 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 through the diameter if your project requires it.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Pros

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

They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
Magnets very well protect themselves against demagnetization caused by external fields,
A magnet with a metallic gold surface has better aesthetics,
They are known for high magnetic induction at the operating surface, which affects their effectiveness,
Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
Due to the ability of flexible molding and customization to custom needs, magnetic components can be created in a broad palette of geometric configurations, which expands the range of possible applications,
Huge importance in innovative solutions – they are utilized in magnetic memories, electric drive systems, diagnostic systems, as well as technologically advanced constructions.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of neodymium magnets:

They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
Neodymium magnets lose their force 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
They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited possibility of producing threads in the magnet and complicated shapes - preferred is cover - magnetic holder.
Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

The specified lifting capacity refers to the peak performance, measured under optimal environment, specifically:

with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
whose thickness is min. 10 mm
characterized by smoothness
under conditions of gap-free contact (surface-to-surface)
under axial force vector (90-degree angle)
at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

During everyday use, the real power results from a number of factors, listed from most significant:

Distance – existence of any layer (paint, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
Direction of force – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
Surface finish – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets

Mechanical processing

Powder produced during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Crushing risk

Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them cracking into small pieces.

Demagnetization risk

Do not overheat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Nickel coating and allergies

A percentage of the population suffer from a contact allergy to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause skin redness. We strongly advise wear protective gloves.

Implant safety

Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Keep away from children

These products are not suitable for play. Swallowing multiple magnets may result in them attracting across intestines, which poses a severe health hazard and requires immediate surgery.

Threat to navigation

Remember: rare earth magnets produce a field that confuses precision electronics. Maintain a separation from your phone, tablet, and GPS.

Handling guide

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

Safe distance

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Important! Details about risks in the article: Magnet Safety Guide.

MW 40x30 / N38 - cylindrical magnet

Technical parameters - MW 40x30 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the assembly - data

Table 1: Static force (pull vs gap) - interaction chart MW 40x30 / N38

Table 2: Vertical hold (wall) MW 40x30 / N38

Table 3: Vertical assembly (shearing) - vertical pull MW 40x30 / N38

Table 4: Material efficiency (saturation) - power losses MW 40x30 / N38

Table 5: Thermal stability (material behavior) - thermal limit MW 40x30 / N38

Table 6: Two magnets (attraction) - field collision MW 40x30 / N38

Table 7: Safety (HSE) (electronics) - warnings MW 40x30 / N38

Table 8: Impact energy (cracking risk) - collision effects MW 40x30 / N38

Table 9: Surface protection spec MW 40x30 / N38

Table 10: Electrical data (Flux) MW 40x30 / N38

Table 11: Underwater work (magnet fishing) MW 40x30 / N38

1. Sliding resistance

2. Steel thickness impact

3. Thermal stability

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

Elemental analysis

Environmental data

Pulling force

Magnetic Induction

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Pros as well as cons of Nd2Fe14B magnets.

Pros

Weaknesses

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

Practical aspects of lifting capacity – factors

H&S for magnets

Mechanical processing

Crushing risk

Magnets are brittle

Demagnetization risk

Nickel coating and allergies

Implant safety

Keep away from children

Threat to navigation

Handling guide

Safe distance

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs gap) - interaction chart
MW 40x30 / N38

Table 2: Vertical hold (wall)
MW 40x30 / N38

Table 3: Vertical assembly (shearing) - vertical pull
MW 40x30 / N38

Table 4: Material efficiency (saturation) - power losses
MW 40x30 / N38

Table 5: Thermal stability (material behavior) - thermal limit
MW 40x30 / N38

Table 6: Two magnets (attraction) - field collision
MW 40x30 / N38

Table 7: Safety (HSE) (electronics) - warnings
MW 40x30 / N38

Table 8: Impact energy (cracking risk) - collision effects
MW 40x30 / N38

Table 9: Surface protection spec
MW 40x30 / N38

Table 10: Electrical data (Flux)
MW 40x30 / N38

Table 11: Underwater work (magnet fishing)
MW 40x30 / N38

Pros as well as cons of Nd₂Fe₁₄B magnets.