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MW 29.9x10 / 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 010052

GTIN/EAN: 5906301810513

Diameter Ø

29.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

52.66 g

Magnetization Direction

→ diametrical

Load capacity

21.50 kg / 210.90 N

Magnetic Induction

344.60 mT / 3446 Gs

Coating

[NiCuNi] Nickel

24.60 ZŁ with VAT / pcs + price for transport

20.00 ZŁ net + 23% VAT / pcs

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MW 29.9x10 / N38 - cylindrical magnet

Specification / characteristics MW 29.9x10 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010052
GTIN/EAN	5906301810513
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	29.9 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	52.66 g
Magnetization Direction	→ diametrical
Load capacity ~ ?	21.50 kg / 210.90 N
Magnetic Induction ~ ?	344.60 mT / 3446 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 29.9x10 / 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 simulation of the assembly - data

Presented data constitute the result of a physical calculation. Results were calculated on models for the class Nd₂Fe₁₄B. Real-world parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MW 29.9x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3445 Gs 344.5 mT	21.50 kg / 21500.0 g 210.9 N	dangerous!
1 mm	3261 Gs 326.1 mT	19.26 kg / 19256.6 g 188.9 N	dangerous!
2 mm	3059 Gs 305.9 mT	16.95 kg / 16947.4 g 166.3 N	dangerous!
3 mm	2848 Gs 284.8 mT	14.70 kg / 14696.2 g 144.2 N	dangerous!
5 mm	2425 Gs 242.5 mT	10.65 kg / 10650.1 g 104.5 N	dangerous!
10 mm	1519 Gs 151.9 mT	4.18 kg / 4178.4 g 41.0 N	warning
15 mm	930 Gs 93.0 mT	1.57 kg / 1565.8 g 15.4 N	weak grip
20 mm	583 Gs 58.3 mT	0.62 kg / 616.0 g 6.0 N	weak grip
30 mm	258 Gs 25.8 mT	0.12 kg / 121.0 g 1.2 N	weak grip
50 mm	76 Gs 7.6 mT	0.01 kg / 10.4 g 0.1 N	weak grip

Pulling power weakens significantly with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, paint, veneer) noticeably reduces the pull force. Neodymiums work optimally at the point of direct contact; distance nullifies the power. Notice how rapidly the load capacity drop, when the magnet does not adhere directly to the steel surface. When designing the assembly, discard additional spacers.

Table 2: Slippage Hold (Vertical Surface)
MW 29.9x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	4.30 kg / 4300.0 g 42.2 N
1 mm	Stal (~0.2)	3.85 kg / 3852.0 g 37.8 N
2 mm	Stal (~0.2)	3.39 kg / 3390.0 g 33.3 N
3 mm	Stal (~0.2)	2.94 kg / 2940.0 g 28.8 N
5 mm	Stal (~0.2)	2.13 kg / 2130.0 g 20.9 N
10 mm	Stal (~0.2)	0.84 kg / 836.0 g 8.2 N
15 mm	Stal (~0.2)	0.31 kg / 314.0 g 3.1 N
20 mm	Stal (~0.2)	0.12 kg / 124.0 g 1.2 N
30 mm	Stal (~0.2)	0.02 kg / 24.0 g 0.2 N
50 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N

The table below indicates the estimated holding capacity required to start the shifting of the magnet vertically against a vertical steel wall (considering standard friction). The holding force varies with the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 29.9x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	6.45 kg / 6450.0 g 63.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	4.30 kg / 4300.0 g 42.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	2.15 kg / 2150.0 g 21.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	10.75 kg / 10750.0 g 105.5 N

When placing a holder on a upright plane (e.g., a fridge), it will maintain just approx. 20%-30% of nominal attraction strength. Gravity and a weak degree of grip influence the fact that holders slip easier than they pull off. Designing a wall mount? Remember that the shear force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter cargo. Utilizing a rubberized layer can effectively improve the result.

Table 4: Steel thickness (saturation) - power losses
MW 29.9x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.08 kg / 1075.0 g 10.5 N
1 mm	13%	2.69 kg / 2687.5 g 26.4 N
2 mm	25%	5.38 kg / 5375.0 g 52.7 N
5 mm	63%	13.44 kg / 13437.5 g 131.8 N
10 mm	100%	21.50 kg / 21500.0 g 210.9 N

A too thin steel is incapable of conduct the entire magnetic field, which squanders power of the holder. Should you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To squeeze full efficiency of this neodymium's potential, you need a suitably thick backing of steel. The saturation effect means that on thin elements (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 29.9x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	21.50 kg / 21500.0 g 210.9 N	OK
40 °C	-2.2%	21.03 kg / 21027.0 g 206.3 N	OK
60 °C	-4.4%	20.55 kg / 20554.0 g 201.6 N
80 °C	-6.6%	20.08 kg / 20081.0 g 197.0 N
100 °C	-28.8%	15.31 kg / 15308.0 g 150.2 N

Standard neodymium magnets irreversibly lose power past the thermal threshold. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. With increasing heat, the neodymium's power briefly decreases. Avoid using this product close to heaters higher than its operating temperature limit. Too high temperature will cause destruction of magnetism.

*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 29.9x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	51.38 kg / 51384 g 504.1 N 4 963 Gs	N/A
1 mm	48.76 kg / 48760 g 478.3 N 6 712 Gs	43.88 kg / 43884 g 430.5 N ~0 Gs
2 mm	46.02 kg / 46022 g 451.5 N 6 521 Gs	41.42 kg / 41420 g 406.3 N ~0 Gs
3 mm	43.26 kg / 43260 g 424.4 N 6 322 Gs	38.93 kg / 38934 g 381.9 N ~0 Gs
5 mm	37.78 kg / 37783 g 370.7 N 5 909 Gs	34.00 kg / 34005 g 333.6 N ~0 Gs
10 mm	25.45 kg / 25453 g 249.7 N 4 850 Gs	22.91 kg / 22908 g 224.7 N ~0 Gs
20 mm	9.99 kg / 9986 g 98.0 N 3 038 Gs	8.99 kg / 8988 g 88.2 N ~0 Gs
50 mm	0.63 kg / 627 g 6.1 N 761 Gs	0.56 kg / 564 g 5.5 N ~0 Gs

Two magnetic products interact from a wider radius than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a larger range of operation. Designing a powerful holder? Apply two magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).

Table 7: Safety (HSE) (implants) - warnings
MW 29.9x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	13.5 cm
Hearing aid	10 Gs (1.0 mT)	11.0 cm
Mechanical watch	20 Gs (2.0 mT)	8.5 cm
Mobile device	40 Gs (4.0 mT)	6.5 cm
Car key	50 Gs (5.0 mT)	6.0 cm
Payment card	400 Gs (40.0 mT)	2.5 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

A strong magnetic field is a real danger to electronics and medical implants. These neodymiums produce a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MW 29.9x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.72 km/h (6.31 m/s)	1.05 J
30 mm	35.42 km/h (9.84 m/s)	2.55 J
50 mm	45.58 km/h (12.66 m/s)	4.22 J
100 mm	64.44 km/h (17.90 m/s)	8.44 J

Magnetic elements are delicate – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or injury to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 29.9x10 / 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical Data (Flux)
MW 29.9x10 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	25 588 Mx	255.9 µWb
P_c Coefficient	0.44	Low (Flat)

Total magnetic flux passing through the magnet pole. Essential parameter in coil applications as well as sensors. The P_c coefficient determines the magnet's operating point.

Table 11: Submerged application
MW 29.9x10 / N38

Environment	Effective steel pull	Effect
Air (land)	21.50 kg	Standard
Water (riverbed)	24.62 kg (+3.12 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Shear force

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

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.44

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

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%

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: 010052-2025

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This product is a very strong cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø29.9x10 mm, guarantees optimal power. The MW 29.9x10 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 21.50 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 210.90 N with a weight of only 52.66 g, this rod is indispensable in miniature devices and wherever every gram matters.

Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 29.9.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø29.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.

This model is characterized by dimensions Ø29.9x10 mm, which, at a weight of 52.66 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 21.50 kg (force ~210.90 N), which, with such defined 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 29.9 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 and cons of rare earth magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:

They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
They have excellent resistance to magnetism drop due to external magnetic sources,
The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Thanks to versatility in forming and the capacity to adapt to unusual requirements,
Key role in high-tech industry – they are used in data components, electric drive systems, diagnostic systems, also modern systems.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Cons

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
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
Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complex forms.
Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
Due to complex production process, their price exceeds standard values,

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

Magnet power was determined for the most favorable conditions, including:

using a sheet made of mild steel, serving as a magnetic yoke
whose transverse dimension equals approx. 10 mm
characterized by lack of roughness
with direct contact (without impurities)
during pulling in a direction vertical to the plane
at ambient temperature room level

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity is determined by many variables, listed from most significant:

Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
Plate thickness – too thin plate does not accept the full field, causing part of the flux to be lost to the other side.
Steel grade – the best choice is high-permeability steel. Stainless steels may attract less.
Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. In addition, even a small distance between the magnet and the plate reduces the load capacity.

H&S for magnets

Magnetic media

Powerful magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Risk of cracking

Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Permanent damage

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

Combustion hazard

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Allergy Warning

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, refrain from direct skin contact and opt for coated magnets.

Hand protection

Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Health Danger

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

Choking Hazard

Absolutely store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.

Compass and GPS

Remember: neodymium magnets generate a field that confuses sensitive sensors. Maintain a separation from your mobile, device, and GPS.

Do not underestimate power

Use magnets consciously. Their immense force can surprise even experienced users. Be vigilant and respect their power.

Security! Learn more about risks in the article: Safety of working with magnets.

MW 29.9x10 / N38 - cylindrical magnet

Not sure what to buy?

MW 29.9x10 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the assembly - data

1. Shear force

2. Steel thickness impact

3. Thermal stability

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

Material specification

Environmental data

Force (Pull)

Magnetic Induction

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MPL 30x20x10 / N38 - lamellar magnet

MP 5x2.7/1.2x5 C / N38 - ring magnet

MPL 50x20x5 / N38 - lamellar magnet

MP 20x8x6 / N38 - ring magnet

Pros and cons of rare earth magnets.

Advantages

Cons

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

Determinants of practical lifting force of a magnet

Magnetic media

Risk of cracking

Permanent damage

Combustion hazard

Allergy Warning

Hand protection

Health Danger

Choking Hazard

Compass and GPS

Do not underestimate power

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C