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MW 29x10 / 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 010053

GTIN/EAN: 5906301810520

5.00

Diameter Ø

29 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

49.54 g

Magnetization Direction

↑ axial

Load capacity

20.82 kg / 204.22 N

Magnetic Induction

351.88 mT / 3519 Gs

Coating

[NiCuNi] Nickel

view parameters »

17.34 ZŁ with VAT / pcs + price for transport

14.10 ZŁ net + 23% VAT / pcs

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Physical properties - MW 29x10 / N38 - cylindrical magnet

Specification / characteristics - MW 29x10 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010053
GTIN/EAN	5906301810520
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 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	49.54 g
Magnetization Direction	↑ axial
Load capacity ~ ?	20.82 kg / 204.22 N
Magnetic Induction ~ ?	351.88 mT / 3519 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 29x10 / 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 magnet - report

Presented data represent the outcome of a engineering analysis. Results are based on models for the material Nd₂Fe₁₄B. Real-world conditions may differ. Use these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MW 29x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3518 Gs 351.8 mT	20.82 kg / 20820.0 g 204.2 N	critical level
1 mm	3321 Gs 332.1 mT	18.55 kg / 18548.8 g 182.0 N	critical level
2 mm	3106 Gs 310.6 mT	16.23 kg / 16226.1 g 159.2 N	critical level
3 mm	2883 Gs 288.3 mT	13.98 kg / 13978.2 g 137.1 N	critical level
5 mm	2437 Gs 243.7 mT	9.99 kg / 9987.1 g 98.0 N	medium risk
10 mm	1500 Gs 150.0 mT	3.78 kg / 3783.1 g 37.1 N	medium risk
15 mm	905 Gs 90.5 mT	1.38 kg / 1379.2 g 13.5 N	weak grip
20 mm	563 Gs 56.3 mT	0.53 kg / 532.4 g 5.2 N	weak grip
30 mm	247 Gs 24.7 mT	0.10 kg / 102.4 g 1.0 N	weak grip
50 mm	72 Gs 7.2 mT	0.01 kg / 8.7 g 0.1 N	weak grip

Pulling power decreases significantly with every mm of distance. Note that even a microscopic distance (e.g., dirt, paint, veneer) strongly diminishes the holding power. Magnetic products operate most effectively in perfect adhesion; distance drastically cuts the power. Notice how quickly the pull force plummet, when the magnet does not touch flatly to the steel surface. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Slippage load (wall)
MW 29x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	4.16 kg / 4164.0 g 40.8 N
1 mm	Stal (~0.2)	3.71 kg / 3710.0 g 36.4 N
2 mm	Stal (~0.2)	3.25 kg / 3246.0 g 31.8 N
3 mm	Stal (~0.2)	2.80 kg / 2796.0 g 27.4 N
5 mm	Stal (~0.2)	2.00 kg / 1998.0 g 19.6 N
10 mm	Stal (~0.2)	0.76 kg / 756.0 g 7.4 N
15 mm	Stal (~0.2)	0.28 kg / 276.0 g 2.7 N
20 mm	Stal (~0.2)	0.11 kg / 106.0 g 1.0 N
30 mm	Stal (~0.2)	0.02 kg / 20.0 g 0.2 N
50 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N

The following data calculates the theoretical weight limit sufficient to cause the shifting of the magnet vertically against a upright steel wall (considering standard friction coefficient). This value is relative to the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 29x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	6.25 kg / 6246.0 g 61.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	4.16 kg / 4164.0 g 40.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	2.08 kg / 2082.0 g 20.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	10.41 kg / 10410.0 g 102.1 N

When placing a holder on a upright surface (e.g., a car body), it will only hold barely about 1/5 of its nominal power. Gravity as well as a weak degree of grip influence the fact that holders slip easier than they pull off. Designing a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slip down under a much lighter load. Using a rubber pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 29x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.04 kg / 1041.0 g 10.2 N
1 mm	13%	2.60 kg / 2602.5 g 25.5 N
2 mm	25%	5.21 kg / 5205.0 g 51.1 N
5 mm	63%	13.01 kg / 13012.5 g 127.7 N
10 mm	100%	20.82 kg / 20820.0 g 204.2 N

A thin metal plate is not enough to absorb the full magnetic flux, which weakens actual performance of the holder. If you mount a strong magnet to a weak sheet, the field will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you require a sufficiently solid backing of metal. The material oversaturation causes that on thin elements (e.g., car bodies), the magnet works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MW 29x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	20.82 kg / 20820.0 g 204.2 N	OK
40 °C	-2.2%	20.36 kg / 20362.0 g 199.8 N	OK
60 °C	-4.4%	19.90 kg / 19903.9 g 195.3 N
80 °C	-6.6%	19.45 kg / 19445.9 g 190.8 N
100 °C	-28.8%	14.82 kg / 14823.8 g 145.4 N

Ordinary NdFeB products change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly damage this product. As the temperature rises, the neodymium's force temporarily lowers. Do not use this product close to heaters higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.

*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. The danger warning in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MW 29x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	50.40 kg / 50399 g 494.4 N 5 016 Gs	N/A
1 mm	47.70 kg / 47704 g 468.0 N 6 845 Gs	42.93 kg / 42934 g 421.2 N ~0 Gs
2 mm	44.90 kg / 44901 g 440.5 N 6 641 Gs	40.41 kg / 40411 g 396.4 N ~0 Gs
3 mm	42.08 kg / 42082 g 412.8 N 6 429 Gs	37.87 kg / 37874 g 371.5 N ~0 Gs
5 mm	36.52 kg / 36522 g 358.3 N 5 990 Gs	32.87 kg / 32870 g 322.5 N ~0 Gs
10 mm	24.18 kg / 24176 g 237.2 N 4 873 Gs	21.76 kg / 21758 g 213.4 N ~0 Gs
20 mm	9.16 kg / 9158 g 89.8 N 2 999 Gs	8.24 kg / 8242 g 80.9 N ~0 Gs
50 mm	0.54 kg / 542 g 5.3 N 729 Gs	0.49 kg / 487 g 4.8 N ~0 Gs

Two strong neodymiums interact from a significantly greater distance than a neodymium and metal combination. Such a system of two magnets produces a massive flux and a wider radius of action. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the collision energy is massive. The levitation is slightly lower than the attraction, but still large.
*Flux density for N-N configuration drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).

Table 7: Protective zones (implants) - warnings
MW 29x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	13.5 cm
Hearing aid	10 Gs (1.0 mT)	10.5 cm
Timepiece	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

Extremely neodym field is a serious hazard to electronics and pacemakers. These NdFeB products generate a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 29x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.90 km/h (6.36 m/s)	1.00 J
30 mm	35.92 km/h (9.98 m/s)	2.47 J
50 mm	46.24 km/h (12.85 m/s)	4.09 J
100 mm	65.38 km/h (18.16 m/s)	8.17 J

NdFeB products are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or painful pinches to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when handling with large magnets.

Table 9: Surface protection spec
MW 29x10 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (P_c)
MW 29x10 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	24 471 Mx	244.7 µWb
P_c Coefficient	0.45	Low (Flat)

Flux value emitted by the pole surface. Key data when building generators as well as sensors. P_c value defines the working geometry.

Table 11: Submerged application
MW 29x10 / N38

Environment	Effective steel pull	Effect
Air (land)	20.82 kg	Standard
Water (riverbed)	23.84 kg (+3.02 kg Buoyancy gain)	+14.5%

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

Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Sliding resistance

*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Thermal stability

*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) = 0.45

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.

Engineering data and GPSR

Chemical composition

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: 010053-2025

Measurement Calculator

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BM 850x180x70 [4x M8] - magnetic beam

7729.93 ZŁ brutto / pcs

This product is an exceptionally strong rod magnet, produced from advanced NdFeB material, which, at dimensions of Ø29x10 mm, guarantees the highest energy density. This specific item features a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 20.82 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 204.22 N with a weight of only 49.54 g, this rod is indispensable in electronics and wherever low weight is crucial.

Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking 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 an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø29x10), 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 29 mm and height 10 mm. The key parameter here is the holding force amounting to approximately 20.82 kg (force ~204.22 N), which, with such defined 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 29 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.

Strengths and weaknesses of rare earth magnets.

Advantages

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

They retain magnetic properties for almost ten years – the loss is just ~1% (based on simulations),
They maintain their magnetic properties even under close interference source,
The use of an refined layer of noble metals (nickel, gold, silver) causes the element to present itself better,
Magnets exhibit very high magnetic induction on the surface,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
Thanks to the possibility of precise molding and customization to custom requirements, neodymium magnets can be produced in a variety of geometric configurations, which increases their versatility,
Fundamental importance in innovative solutions – they are used in mass storage devices, electromotive mechanisms, medical equipment, as well as technologically advanced constructions.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

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

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
We suggest casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical in case of swallowing.
Due to neodymium price, their price is higher than average,

Pull force analysis

Maximum holding power of the magnet – what affects it?

The force parameter is a theoretical maximum value performed under specific, ideal conditions:

on a block made of structural steel, effectively closing the magnetic field
possessing a thickness of min. 10 mm to ensure full flux closure
with an polished touching surface
without any clearance between the magnet and steel
for force acting at a right angle (pull-off, not shear)
at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Please note that the magnet holding may be lower influenced by the following factors, in order of importance:

Distance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
Steel thickness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted to the other side.
Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets

Life threat

People with a heart stimulator have to keep an large gap from magnets. The magnetic field can interfere with the operation of the implant.

Eye protection

NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them shattering into small pieces.

Caution required

Handle magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their force.

Choking Hazard

These products are not toys. Swallowing several magnets may result in them attracting across intestines, which constitutes a direct threat to life and necessitates immediate surgery.

Protect data

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Impact on smartphones

Remember: rare earth magnets generate a field that confuses precision electronics. Keep a safe distance from your mobile, tablet, and navigation systems.

Machining danger

Fire hazard: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Crushing force

Big blocks can break fingers in a fraction of a second. Do not put your hand between two strong magnets.

Maximum temperature

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Allergy Warning

It is widely known that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, prevent direct skin contact or choose versions in plastic housing.

Security! Details about hazards in the article: Safety of working with magnets.

MW 29x10 / N38 - cylindrical magnet

Physical properties - MW 29x10 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the magnet - report

Table 1: Static force (pull vs distance) - interaction chart MW 29x10 / N38

Table 2: Slippage load (wall) MW 29x10 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MW 29x10 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 29x10 / N38

Table 5: Working in heat (stability) - resistance threshold MW 29x10 / N38

Table 6: Two magnets (attraction) - field collision MW 29x10 / N38

Table 7: Protective zones (implants) - warnings MW 29x10 / N38

Table 8: Impact energy (cracking risk) - warning MW 29x10 / N38

Table 9: Surface protection spec MW 29x10 / N38

Table 10: Electrical data (Pc) MW 29x10 / N38

Table 11: Submerged application MW 29x10 / N38

1. Sliding resistance

2. Efficiency vs thickness

3. Thermal stability

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

Chemical composition

Environmental data

Pulling force

Magnetic Induction

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UMH 20x7x35 [M4] / N38 - magnetic holder with hook

BM 850x180x70 [4x M8] - magnetic beam

Strengths and weaknesses of rare earth magnets.

Advantages

Disadvantages

Pull force analysis

Maximum holding power of the magnet – what affects it?

Practical aspects of lifting capacity – factors

Precautions when working with neodymium magnets

Life threat

Eye protection

Caution required

Choking Hazard

Protect data

Impact on smartphones

Machining danger

Crushing force

Maximum temperature

Allergy Warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs distance) - interaction chart
MW 29x10 / N38

Table 2: Slippage load (wall)
MW 29x10 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 29x10 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 29x10 / N38

Table 5: Working in heat (stability) - resistance threshold
MW 29x10 / N38

Table 6: Two magnets (attraction) - field collision
MW 29x10 / N38

Table 7: Protective zones (implants) - warnings
MW 29x10 / N38

Table 8: Impact energy (cracking risk) - warning
MW 29x10 / N38

Table 9: Surface protection spec
MW 29x10 / N38

Table 10: Electrical data (P_c)
MW 29x10 / N38

Table 11: Submerged application
MW 29x10 / N38