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MW 8x15 / 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 010102

GTIN/EAN: 5906301811015

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

5.65 g

Magnetization Direction

↑ axial

Load capacity

1.47 kg / 14.45 N

Magnetic Induction

598.12 mT / 5981 Gs

Coating

[NiCuNi] Nickel

technical details »

3.44 ZŁ with VAT / pcs + price for transport

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Technical data of the product - MW 8x15 / N38 - cylindrical magnet

Specification / characteristics - MW 8x15 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010102
GTIN/EAN	5906301811015
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	8 mm [±0,1 mm]
Height	15 mm [±0,1 mm]
Weight	5.65 g
Magnetization Direction	↑ axial
Load capacity ~ ?	1.47 kg / 14.45 N
Magnetic Induction ~ ?	598.12 mT / 5981 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x15 / 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 analysis of the assembly - report

Presented data constitute the direct effect of a mathematical simulation. Values were calculated on algorithms for the class Nd₂Fe₁₄B. Actual parameters may differ. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - characteristics
MW 8x15 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5975 Gs 597.5 mT	1.47 kg / 1470.0 g 14.4 N	safe
1 mm	4511 Gs 451.1 mT	0.84 kg / 837.8 g 8.2 N	safe
2 mm	3262 Gs 326.2 mT	0.44 kg / 438.2 g 4.3 N	safe
3 mm	2332 Gs 233.2 mT	0.22 kg / 224.0 g 2.2 N	safe
5 mm	1238 Gs 123.8 mT	0.06 kg / 63.1 g 0.6 N	safe
10 mm	366 Gs 36.6 mT	0.01 kg / 5.5 g 0.1 N	safe
15 mm	155 Gs 15.5 mT	0.00 kg / 1.0 g 0.0 N	safe
20 mm	80 Gs 8.0 mT	0.00 kg / 0.3 g 0.0 N	safe
30 mm	30 Gs 3.0 mT	0.00 kg / 0.0 g 0.0 N	safe
50 mm	8 Gs 0.8 mT	0.00 kg / 0.0 g 0.0 N	safe

Grip strength decreases drastically per each millimeter of distance. Remember that every additional insulation layer (e.g., dirt, paint, rust) significantly reduces the pull force. Neodymiums work optimally during direct contact; gap nullifies the force. Notice how flashily the parameters drop, when the magnet does not touch tightly to the steel surface. When designing the mounting, eliminate redundant distances.

Table 2: Sliding force (vertical surface)
MW 8x15 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.29 kg / 294.0 g 2.9 N
1 mm	Stal (~0.2)	0.17 kg / 168.0 g 1.6 N
2 mm	Stal (~0.2)	0.09 kg / 88.0 g 0.9 N
3 mm	Stal (~0.2)	0.04 kg / 44.0 g 0.4 N
5 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
10 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section shows the theoretical weight limit necessary to start the shifting of the magnet down against a vertical steel wall (considering typical friction). This parameter is relative to the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x15 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.44 kg / 441.0 g 4.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.29 kg / 294.0 g 2.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.15 kg / 147.0 g 1.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.74 kg / 735.0 g 7.2 N

When hanging a holder on a upright surface (e.g., a fridge), it will maintain only about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that holders slip easier than they pop off the substrate. Planning a wall mount? Consider that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a significantly smaller cargo. Using a rubber pad can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 8x15 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.15 kg / 147.0 g 1.4 N
1 mm	25%	0.37 kg / 367.5 g 3.6 N
2 mm	50%	0.74 kg / 735.0 g 7.2 N
5 mm	100%	1.47 kg / 1470.0 g 14.4 N
10 mm	100%	1.47 kg / 1470.0 g 14.4 N

A thin metal plate is incapable of conduct the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a thin surface, the magnetism will pass right through and the attraction force will be weaker. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid element of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the product shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
MW 8x15 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.47 kg / 1470.0 g 14.4 N	OK
40 °C	-2.2%	1.44 kg / 1437.7 g 14.1 N	OK
60 °C	-4.4%	1.41 kg / 1405.3 g 13.8 N	OK
80 °C	-6.6%	1.37 kg / 1373.0 g 13.5 N
100 °C	-28.8%	1.05 kg / 1046.6 g 10.3 N

Classic neodymiums change their properties strength above the temperature limit. Protect against heat – high temperature can permanently demagnetize this magnet. With increasing heat, the magnet's capacity temporarily decreases. Refrain from using this product in hot environments exceeding its working range. Exceeding the critical threshold will cause permanent loss of magnetic properties.

*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress than long magnets. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 8x15 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	11.06 kg / 11065 g 108.5 N 6 130 Gs	N/A
1 mm	8.49 kg / 8490 g 83.3 N 10 469 Gs	7.64 kg / 7641 g 75.0 N ~0 Gs
2 mm	6.31 kg / 6306 g 61.9 N 9 022 Gs	5.68 kg / 5676 g 55.7 N ~0 Gs
3 mm	4.59 kg / 4590 g 45.0 N 7 697 Gs	4.13 kg / 4131 g 40.5 N ~0 Gs
5 mm	2.36 kg / 2357 g 23.1 N 5 516 Gs	2.12 kg / 2122 g 20.8 N ~0 Gs
10 mm	0.48 kg / 475 g 4.7 N 2 476 Gs	0.43 kg / 428 g 4.2 N ~0 Gs
20 mm	0.04 kg / 41 g 0.4 N 731 Gs	0.04 kg / 37 g 0.4 N ~0 Gs
50 mm	0.00 kg / 1 g 0.0 N 94 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets interact from a significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet generates a stronger field and a wider radius of performance. Want to build a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is massive. The repulsion force is a bit weaker than the attraction, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).

Table 7: Protective zones (implants) - warnings
MW 8x15 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.0 cm
Hearing aid	10 Gs (1.0 mT)	5.0 cm
Mechanical watch	20 Gs (2.0 mT)	4.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.0 cm
Car key	50 Gs (5.0 mT)	2.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

A strong magnetic field is a serious hazard to electronics as well as pacemakers. These neodymiums generate a flux that disrupts operation of digital equipment. Be aware: the unseen radiation penetrates the body and housings. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 8x15 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	16.31 km/h (4.53 m/s)	0.06 J
30 mm	28.18 km/h (7.83 m/s)	0.17 J
50 mm	36.37 km/h (10.10 m/s)	0.29 J
100 mm	51.44 km/h (14.29 m/s)	0.58 J

NdFeB products are prone to chipping – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or painful pinches to skin. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Surface protection spec
MW 8x15 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 8x15 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	3 306 Mx	33.1 µWb
P_c Coefficient	1.19	High (Stable)

Flux value emitted by the pole surface. Essential parameter for generator designers and motors. P_c value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 8x15 / N38

Environment	Effective steel pull	Effect
Air (land)	1.47 kg	Standard
Water (riverbed)	1.68 kg (+0.21 kg Buoyancy gain)	+14.5%

Corrosion 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. Sliding resistance

*Warning: On a vertical surface, the magnet retains only a fraction of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely limits the holding force.

3. Temperature resistance

*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) = 1.19

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

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: 010102-2025

Magnet Unit Converter

Force (pull)

Kilograms (kg)

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Enter a value into a field, and the remaining units change on the fly.

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MPL 40x15x5 / N38 - lamellar magnet

7.63 ZŁ brutto / pcs

This product is an exceptionally strong rod magnet, made from advanced NdFeB material, which, with dimensions of Ø8x15 mm, guarantees the highest energy density. The MW 8x15 / N38 model features high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 1.47 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.

This model is ideal for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 14.45 N with a weight of only 5.65 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.

Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure long-term durability in automation, 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 industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø8x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

This model is characterized by dimensions Ø8x15 mm, which, at a weight of 5.65 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 1.47 kg (force ~14.45 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 15 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.

Advantages as well as disadvantages of rare earth magnets.

Pros

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

They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
They retain their magnetic properties even under external field action,
A magnet with a metallic nickel surface has an effective appearance,
They feature high magnetic induction at the operating surface, making them more effective,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
Considering the ability of accurate forming and customization to unique needs, neodymium magnets can be created in a variety of shapes and sizes, which amplifies use scope,
Wide application in high-tech industry – they are commonly used in mass storage devices, drive modules, medical equipment, as well as other advanced devices.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The specified lifting capacity represents the peak performance, measured under ideal test conditions, specifically:

on a base made of mild steel, optimally conducting the magnetic flux
whose transverse dimension reaches at least 10 mm
characterized by smoothness
with direct contact (without paint)
under axial force direction (90-degree angle)
at temperature room level

Lifting capacity in practice – influencing factors

Holding efficiency is affected by working environment parameters, mainly (from priority):

Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
Direction of force – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
Steel thickness – insufficiently thick steel does not close the flux, causing part of the power to be lost into the air.
Plate material – mild steel attracts best. Higher carbon content lower magnetic properties and holding force.
Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets

Do not underestimate power

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Maximum temperature

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Fragile material

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets leads to them cracking into shards.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease handling magnets and wear gloves.

Data carriers

Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Precision electronics

Navigation devices and smartphones are highly susceptible to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Warning for heart patients

Patients with a pacemaker should maintain an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

Physical harm

Risk of injury: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

Choking Hazard

Adult use only. Small elements can be swallowed, causing serious injuries. Store away from kids and pets.

Dust explosion hazard

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Caution! Looking for details? Read our article: Why are neodymium magnets dangerous?

MW 8x15 / N38 - cylindrical magnet

Technical data of the product - MW 8x15 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the assembly - report

Table 1: Static pull force (pull vs gap) - characteristics MW 8x15 / N38

Table 2: Sliding force (vertical surface) MW 8x15 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MW 8x15 / N38

Table 4: Material efficiency (saturation) - power losses MW 8x15 / N38

Table 5: Working in heat (material behavior) - thermal limit MW 8x15 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field collision MW 8x15 / N38

Table 7: Protective zones (implants) - warnings MW 8x15 / N38

Table 8: Collisions (kinetic energy) - warning MW 8x15 / N38

Table 9: Surface protection spec MW 8x15 / N38

Table 10: Electrical data (Flux) MW 8x15 / N38

Table 11: Hydrostatics and buoyancy MW 8x15 / N38

1. Sliding resistance

2. Steel thickness impact

3. Temperature resistance

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

Elemental analysis

Sustainability

Force (pull)

Magnetic Field

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MPL 40x15x5 / N38 - lamellar magnet

Advantages as well as disadvantages of rare earth magnets.

Pros

Weaknesses

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

Lifting capacity in practice – influencing factors

Safety rules for work with NdFeB magnets

Do not underestimate power

Maximum temperature

Fragile material

Warning for allergy sufferers

Data carriers

Precision electronics

Warning for heart patients

Physical harm

Choking Hazard

Dust explosion hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - characteristics
MW 8x15 / N38

Table 2: Sliding force (vertical surface)
MW 8x15 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x15 / N38

Table 4: Material efficiency (saturation) - power losses
MW 8x15 / N38

Table 5: Working in heat (material behavior) - thermal limit
MW 8x15 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 8x15 / N38

Table 7: Protective zones (implants) - warnings
MW 8x15 / N38

Table 8: Collisions (kinetic energy) - warning
MW 8x15 / N38

Table 9: Surface protection spec
MW 8x15 / N38

Table 10: Electrical data (Flux)
MW 8x15 / N38

Table 11: Hydrostatics and buoyancy
MW 8x15 / N38