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MW 38x3.5 / 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 010062

GTIN/EAN: 5906301810612

5.00

Diameter Ø

38 mm [±0,1 mm]

Height

3.5 mm [±0,1 mm]

Weight

29.77 g

Magnetization Direction

↑ axial

Load capacity

5.09 kg / 49.91 N

Magnetic Induction

112.31 mT / 1123 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

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Product card - MW 38x3.5 / N38 - cylindrical magnet

Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010062
GTIN/EAN	5906301810612
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	38 mm [±0,1 mm]
Height	3.5 mm [±0,1 mm]
Weight	29.77 g
Magnetization Direction	↑ axial
Load capacity ~ ?	5.09 kg / 49.91 N
Magnetic Induction ~ ?	112.31 mT / 1123 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 38x3.5 / 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

Physical analysis of the product - technical parameters

The following data are the outcome of a physical simulation. Values were calculated on algorithms for the material Nd₂Fe₁₄B. Actual parameters might slightly differ from theoretical values. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MW 38x3.5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	1123 Gs 112.3 mT	5.09 kg / 5090.0 g 49.9 N	strong
1 mm	1103 Gs 110.3 mT	4.91 kg / 4910.1 g 48.2 N	strong
2 mm	1075 Gs 107.5 mT	4.66 kg / 4663.0 g 45.7 N	strong
3 mm	1040 Gs 104.0 mT	4.36 kg / 4364.2 g 42.8 N	strong
5 mm	954 Gs 95.4 mT	3.67 kg / 3673.1 g 36.0 N	strong
10 mm	703 Gs 70.3 mT	2.00 kg / 1997.1 g 19.6 N	safe
15 mm	483 Gs 48.3 mT	0.94 kg / 943.2 g 9.3 N	safe
20 mm	326 Gs 32.6 mT	0.43 kg / 429.7 g 4.2 N	safe
30 mm	155 Gs 15.5 mT	0.10 kg / 97.1 g 1.0 N	safe
50 mm	47 Gs 4.7 mT	0.01 kg / 8.9 g 0.1 N	safe

Pulling power drops drastically with every mm of spacing. Note that every additional insulation layer (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Magnetic products hold strongest during direct contact; gap nullifies the power. Observe how flashily the parameters drop, when the magnet does not adhere flatly to the metal substrate. When planning the arrangement, eliminate additional spacers.

Table 2: Slippage hold (wall)
MW 38x3.5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.02 kg / 1018.0 g 10.0 N
1 mm	Stal (~0.2)	0.98 kg / 982.0 g 9.6 N
2 mm	Stal (~0.2)	0.93 kg / 932.0 g 9.1 N
3 mm	Stal (~0.2)	0.87 kg / 872.0 g 8.6 N
5 mm	Stal (~0.2)	0.73 kg / 734.0 g 7.2 N
10 mm	Stal (~0.2)	0.40 kg / 400.0 g 3.9 N
15 mm	Stal (~0.2)	0.19 kg / 188.0 g 1.8 N
20 mm	Stal (~0.2)	0.09 kg / 86.0 g 0.8 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 table below presents the estimated weight limit sufficient to cause the slippage of the magnet vertically along a upright metal surface (considering standard friction). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 38x3.5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.53 kg / 1527.0 g 15.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.02 kg / 1018.0 g 10.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.51 kg / 509.0 g 5.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.55 kg / 2545.0 g 25.0 N

When placing a magnet on a upright surface (e.g., a fridge), it you can count on only approx. 20%-30% of its maximum pull force. Gravity and a weak degree of grip influence the fact that holders slide down faster than they detach. Designing a hanger? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a noticeably lighter load. Using a rubber layer can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 38x3.5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.51 kg / 509.0 g 5.0 N
1 mm	25%	1.27 kg / 1272.5 g 12.5 N
2 mm	50%	2.55 kg / 2545.0 g 25.0 N
5 mm	100%	5.09 kg / 5090.0 g 49.9 N
10 mm	100%	5.09 kg / 5090.0 g 49.9 N

A too thin steel is unable to focus the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's potential, you require a sufficiently solid element of steel. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - thermal limit
MW 38x3.5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	5.09 kg / 5090.0 g 49.9 N	OK
40 °C	-2.2%	4.98 kg / 4978.0 g 48.8 N	OK
60 °C	-4.4%	4.87 kg / 4866.0 g 47.7 N
80 °C	-6.6%	4.75 kg / 4754.1 g 46.6 N
100 °C	-28.8%	3.62 kg / 3624.1 g 35.6 N

Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently damage this magnet. As the temperature rises, the magnet's capacity temporarily decreases. Avoid using this magnet close to heaters exceeding its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.

*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 38x3.5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	8.82 kg / 8818 g 86.5 N 2 143 Gs	N/A
1 mm	8.68 kg / 8679 g 85.1 N 2 228 Gs	7.81 kg / 7811 g 76.6 N ~0 Gs
2 mm	8.51 kg / 8507 g 83.5 N 2 206 Gs	7.66 kg / 7656 g 75.1 N ~0 Gs
3 mm	8.31 kg / 8306 g 81.5 N 2 180 Gs	7.47 kg / 7475 g 73.3 N ~0 Gs
5 mm	7.83 kg / 7829 g 76.8 N 2 116 Gs	7.05 kg / 7046 g 69.1 N ~0 Gs
10 mm	6.36 kg / 6364 g 62.4 N 1 908 Gs	5.73 kg / 5727 g 56.2 N ~0 Gs
20 mm	3.46 kg / 3460 g 33.9 N 1 407 Gs	3.11 kg / 3114 g 30.5 N ~0 Gs
50 mm	0.35 kg / 346 g 3.4 N 445 Gs	0.31 kg / 312 g 3.1 N ~0 Gs

Two magnets interact from a wider radius than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a further horizon of performance. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the impact force is huge. The levitation is a bit weaker than the connection force, but still impressive.
*Flux density between like poles is approximately ~0 Gs at the midpoint between the magnets (due to field cancellation).

Table 7: Hazards (implants) - warnings
MW 38x3.5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	11.5 cm
Hearing aid	10 Gs (1.0 mT)	9.0 cm
Timepiece	20 Gs (2.0 mT)	7.0 cm
Mobile device	40 Gs (4.0 mT)	5.5 cm
Remote	50 Gs (5.0 mT)	5.0 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Extremely neodym field is a real danger to electronics and medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 38x3.5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	16.10 km/h (4.47 m/s)	0.30 J
30 mm	23.11 km/h (6.42 m/s)	0.61 J
50 mm	29.52 km/h (8.20 m/s)	1.00 J
100 mm	41.70 km/h (11.58 m/s)	2.00 J

Magnetic elements are delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can cause material chips or injury to fingers. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Coating parameters (durability)
MW 38x3.5 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 38x3.5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	17 022 Mx	170.2 µWb
P_c Coefficient	0.14	Low (Flat)

Flux value emitted by the pole surface. Essential parameter for generator designers and motors. The P_c coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 38x3.5 / N38

Environment	Effective steel pull	Effect
Air (land)	5.09 kg	Standard
Water (riverbed)	5.83 kg (+0.74 kg Buoyancy gain)	+14.5%

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

Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Shear force

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

2. Plate thickness effect

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.14

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

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%

Sustainability

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: 010062-2025

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The offered product is an extremely powerful cylinder magnet, produced from durable NdFeB material, which, with dimensions of Ø38x3.5 mm, guarantees the highest energy density. The MW 38x3.5 / N38 component features high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 5.09 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is created for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 49.91 N with a weight of only 29.77 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.

Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 38.1 mm) using epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating 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 operational stability. If you need even stronger magnets in the same volume (Ø38x3.5), 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 38 mm and height 3.5 mm. The value of 49.91 N means that the magnet is capable of holding a weight many times exceeding its own mass of 29.77 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 3.5 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths and weaknesses of rare earth magnets.

Strengths

Besides their immense strength, neodymium magnets offer the following advantages:

They do not lose magnetism, even during approximately ten years – the decrease in lifting capacity is only ~1% (based on measurements),
They possess excellent resistance to magnetism drop when exposed to external magnetic sources,
The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to present itself better,
Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
Thanks to freedom in shaping and the capacity to customize to unusual requirements,
Huge importance in advanced technology sectors – they serve a role in magnetic memories, brushless drives, precision medical tools, also industrial machines.
Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of NdFeB magnets:

To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
We recommend a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated shapes.
Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Highest magnetic holding force – what affects it?

Magnet power is the result of a measurement for ideal contact conditions, including:

with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
with a cross-section no less than 10 mm
characterized by smoothness
under conditions of no distance (surface-to-surface)
during pulling in a direction vertical to the mounting surface
in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Real force is affected by working environment parameters, such as (from priority):

Air gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
Material type – the best choice is high-permeability steel. Cast iron may attract less.
Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets

Physical harm

Big blocks can crush fingers instantly. Do not put your hand betwixt two strong magnets.

Magnets are brittle

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Fire risk

Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Phone sensors

Remember: neodymium magnets generate a field that disrupts precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

Data carriers

Do not bring magnets near a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Heat sensitivity

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Metal Allergy

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop handling magnets and wear gloves.

Life threat

Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Product not for children

Product intended for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Store out of reach of children and animals.

Conscious usage

Handle magnets consciously. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their force.

Caution! Want to know more? Read our article: Why are neodymium magnets dangerous?

MW 38x3.5 / N38 - cylindrical magnet

Product card - MW 38x3.5 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - technical parameters

Table 1: Static pull force (pull vs gap) - characteristics MW 38x3.5 / N38

Table 2: Slippage hold (wall) MW 38x3.5 / N38

Table 3: Vertical assembly (shearing) - vertical pull MW 38x3.5 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 38x3.5 / N38

Table 5: Thermal resistance (stability) - thermal limit MW 38x3.5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MW 38x3.5 / N38

Table 7: Hazards (implants) - warnings MW 38x3.5 / N38

Table 8: Collisions (kinetic energy) - collision effects MW 38x3.5 / N38

Table 9: Coating parameters (durability) MW 38x3.5 / N38

Table 10: Construction data (Flux) MW 38x3.5 / N38

Table 11: Hydrostatics and buoyancy MW 38x3.5 / N38

1. Shear force

2. Plate thickness effect

3. Power loss vs temp

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

Elemental analysis

Sustainability

Pulling force

Field Strength

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MW 14x10 / N38 - cylindrical magnet

SMZR 32x225 / N52 - magnetic separator with handle

UMT 29x38 white / N38 - board holder

UMT 12x20 black / N38 - board holder

Strengths and weaknesses of rare earth magnets.

Strengths

Disadvantages

Lifting parameters

Highest magnetic holding force – what affects it?

Determinants of practical lifting force of a magnet

H&S for magnets

Physical harm

Magnets are brittle

Fire risk

Phone sensors

Data carriers

Heat sensitivity

Metal Allergy

Life threat

Product not for children

Conscious usage

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - characteristics
MW 38x3.5 / N38

Table 2: Slippage hold (wall)
MW 38x3.5 / N38

Table 3: Vertical assembly (shearing) - vertical pull
MW 38x3.5 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 38x3.5 / N38

Table 5: Thermal resistance (stability) - thermal limit
MW 38x3.5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 38x3.5 / N38

Table 7: Hazards (implants) - warnings
MW 38x3.5 / N38

Table 8: Collisions (kinetic energy) - collision effects
MW 38x3.5 / N38

Table 9: Coating parameters (durability)
MW 38x3.5 / N38

Table 10: Construction data (Flux)
MW 38x3.5 / N38

Table 11: Hydrostatics and buoyancy
MW 38x3.5 / N38