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MP 30x6x10 / N38 - ring magnet

ring magnet

Catalog no 030197

GTIN: 5906301812142

5.00

Diameter

30 mm [±0,1 mm]

internal diameter Ø

6 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

50.89 g

Magnetization Direction

↑ axial

Load capacity

20.71 kg / 203.16 N

Magnetic Induction

343.81 mT / 3438 Gs

Coating

[NiCuNi] Nickel

16.00 ZŁ with VAT / pcs + price for transport

13.01 ZŁ net + 23% VAT / pcs

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MP 30x6x10 / N38 - ring magnet

Specification / characteristics MP 30x6x10 / N38 - ring magnet

properties

properties	values
Cat. no.	030197
GTIN	5906301812142
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	30 mm [±0,1 mm]
internal diameter Ø	6 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	50.89 g
Magnetization Direction	↑ axial
Load capacity ~ ?	20.71 kg / 203.16 N
Magnetic Induction ~ ?	343.81 mT / 3438 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 30x6x10 / N38 - ring magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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 106	°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 modeling of the assembly - technical parameters

These information constitute the outcome of a physical simulation. Results are based on algorithms for the material NdFeB. Real-world conditions might slightly differ from theoretical values. Use these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - power drop
MP 30x6x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5619 Gs 561.9 mT	20.71 kg / 20710.0 g 203.2 N	critical level
1 mm	5241 Gs 524.1 mT	18.01 kg / 18011.7 g 176.7 N	critical level
2 mm	4861 Gs 486.1 mT	15.50 kg / 15498.1 g 152.0 N	critical level
3 mm	4490 Gs 449.0 mT	13.22 kg / 13223.5 g 129.7 N	critical level
5 mm	3792 Gs 379.2 mT	9.43 kg / 9429.0 g 92.5 N	warning
10 mm	2404 Gs 240.4 mT	3.79 kg / 3791.3 g 37.2 N	warning
15 mm	1526 Gs 152.6 mT	1.53 kg / 1527.0 g 15.0 N	weak grip
20 mm	1000 Gs 100.0 mT	0.66 kg / 655.5 g 6.4 N	weak grip
30 mm	482 Gs 48.2 mT	0.15 kg / 152.6 g 1.5 N	weak grip
50 mm	161 Gs 16.1 mT	0.02 kg / 17.0 g 0.2 N	weak grip

Grip strength weakens significantly per each millimeter of spacing. Remember that even the smallest gap (e.g., dirt, paint, dust) noticeably reduces the pull force. Neodymiums operate most effectively in perfect adhesion; distance drastically cuts the power. Notice how flashily the parameters plummet, when the product does not touch tightly to the steel surface. When designing the assembly, discard redundant distances.

Table 2: Slippage Hold (Vertical Surface)
MP 30x6x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	4.14 kg / 4142.0 g 40.6 N
1 mm	Stal (~0.2)	3.60 kg / 3602.0 g 35.3 N
2 mm	Stal (~0.2)	3.10 kg / 3100.0 g 30.4 N
3 mm	Stal (~0.2)	2.64 kg / 2644.0 g 25.9 N
5 mm	Stal (~0.2)	1.89 kg / 1886.0 g 18.5 N
10 mm	Stal (~0.2)	0.76 kg / 758.0 g 7.4 N
15 mm	Stal (~0.2)	0.31 kg / 306.0 g 3.0 N
20 mm	Stal (~0.2)	0.13 kg / 132.0 g 1.3 N
30 mm	Stal (~0.2)	0.03 kg / 30.0 g 0.3 N
50 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N

The following data indicates the estimated weight limit required to cause the downward movement of the magnet vertically along a vertical metal surface (considering standard friction coefficient). The holding force varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MP 30x6x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	6.21 kg / 6213.0 g 60.9 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	4.14 kg / 4142.0 g 40.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	2.07 kg / 2071.0 g 20.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	10.36 kg / 10355.0 g 101.6 N

When hanging a magnet on a upright surface (e.g., a fridge), it will only hold only approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that magnets move down easier than they pop off the substrate. Want to create a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slip down under a much lighter load. Utilizing a rubberized pad can effectively improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MP 30x6x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.04 kg / 1035.5 g 10.2 N
1 mm	13%	2.59 kg / 2588.8 g 25.4 N
2 mm	25%	5.18 kg / 5177.5 g 50.8 N
5 mm	63%	12.94 kg / 12943.8 g 127.0 N
10 mm	100%	20.71 kg / 20710.0 g 203.2 N

A thin sheet is not enough to absorb the full magnetic flux, which wastes potential of the holder. If you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this magnet's potential, you need a suitably thick piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - thermal limit
MP 30x6x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	20.71 kg / 20710.0 g 203.2 N	OK
40 °C	-2.2%	20.25 kg / 20254.4 g 198.7 N	OK
60 °C	-4.4%	19.80 kg / 19798.8 g 194.2 N	OK
80 °C	-6.6%	19.34 kg / 19343.1 g 189.8 N
100 °C	-28.8%	14.75 kg / 14745.5 g 144.7 N

Classic neodymiums irreversibly lose strength above the temperature limit. Protect against heat – high temperature can permanently demagnetize this product. With every degree above norm, the neodymium's power briefly decreases. Do not use this magnet in hot environments exceeding its safe range. Exceeding the critical threshold will cause destruction of magnetic properties.

*Technical advisory: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress compared to rod magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 30x6x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	103.97 kg / 103971 g 1020.0 N 6 035 Gs	N/A
1 mm	97.15 kg / 97146 g 953.0 N 10 864 Gs	87.43 kg / 87431 g 857.7 N ~0 Gs
2 mm	90.42 kg / 90424 g 887.1 N 10 481 Gs	81.38 kg / 81382 g 798.4 N ~0 Gs
3 mm	83.97 kg / 83971 g 823.8 N 10 100 Gs	75.57 kg / 75574 g 741.4 N ~0 Gs
5 mm	71.94 kg / 71940 g 705.7 N 9 349 Gs	64.75 kg / 64746 g 635.2 N ~0 Gs
10 mm	47.34 kg / 47337 g 464.4 N 7 583 Gs	42.60 kg / 42603 g 417.9 N ~0 Gs
20 mm	19.03 kg / 19034 g 186.7 N 4 809 Gs	17.13 kg / 17130 g 168.0 N ~0 Gs
50 mm	1.53 kg / 1529 g 15.0 N 1 363 Gs	1.38 kg / 1376 g 13.5 N ~0 Gs

Two strong neodymiums interact from a significantly greater distance than a magnet and steel combination. Such a system of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The levitation is slightly lower than the attraction, but still large.
*Flux density in repulsion mode is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).

Table 7: Safety (HSE) (electronics) - warnings
MP 30x6x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	19.5 cm
Hearing aid	10 Gs (1.0 mT)	15.0 cm
Timepiece	20 Gs (2.0 mT)	12.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	9.0 cm
Car key	50 Gs (5.0 mT)	8.5 cm
Payment card	400 Gs (40.0 mT)	3.5 cm
HDD hard drive	600 Gs (60.0 mT)	3.0 cm

A strong magnetic field is a large risk to IT equipment as well as pacemakers. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation penetrates the body and housings. Special caution must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MP 30x6x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.55 km/h (6.26 m/s)	1.00 J
30 mm	35.40 km/h (9.83 m/s)	2.46 J
50 mm	45.52 km/h (12.64 m/s)	4.07 J
100 mm	64.34 km/h (17.87 m/s)	8.13 J

Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or painful pinches to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Surface protection spec
MP 30x6x10 / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Design data (Flux)
MP 30x6x10 / N38

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	31 585 Mx	315.8 µWb
Współczynnik Pc	0.96	Wysoki (Stabilny)

Total magnetic flux flowing through the pole face. Essential parameter for motor design and Hall effect devices. Permeance Coefficient determines the magnet operating point.

Table 11: Underwater work (magnet fishing)
MP 30x6x10 / N38

Environment	Effective steel pull	Effect
Air (land)	20.71 kg	Standard
Water (riverbed)	23.71 kg (+3.00 kg Buoyancy gain)	+14.5%

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

The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Montaż na Ścianie (Ześlizg)

*Uwaga: Na pionowej ścianie magnes utrzyma tylko ok. 20-30% tego co na suficie.

2. Wpływ Grubości Blachy

*Cienka blacha (np. obudowa PC 0.5mm) drastycznie osłabia magnes.

3. Wytrzymałość Temperaturowa

*Dla materiału N38 granica bezpieczeństwa to 80°C.

Quick Unit Converter

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Jak rozdzielać?

Nie próbuj odrywać magnesów siłą!
Zawsze zsuwaj je na bok krawędzi stołu.

STAY

MOVE

Zasady Bezpieczeństwa

Elektronika

Trzymaj z dala od dysków HDD, kart płatniczych i telefonów.

Rozruszniki Serca

Osoby z rozrusznikiem muszą zachować dystans min. 10 cm.

Nie dla dzieci

Ryzyko połknięcia. Połknięcie dwóch magnesów grozi śmiercią.

Kruchy materiał

Magnes to ceramika! Uderzenie o inny magnes spowoduje odpryski.

Do czego użyć tego magnesu?

Sprawdzone zastosowania dla wymiaru 15x10x2 mm

Elektronika i Czujniki

Idealny jako element wyzwalający dla czujników Halla oraz kontaktronów w systemach alarmowych. Płaski kształt (2mm) pozwala na ukrycie go w wąskich szczelinach obudowy.

Modelarstwo i Druk 3D

Stosowany do tworzenia niewidocznych zamknięć w modelach drukowanych 3D. Można go wprasować w wydruk lub wkleić w kieszeń zaprojektowaną w modelu CAD.

Meble i Fronty

Używany jako "domykacz" lekkich drzwiczek szafkowych, gdzie standardowe magnesy meblowe są za grube. Wymaga wklejenia w płytkie podfrezowanie.

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The ring magnet with a hole MP 30x6x10 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 20.71 kg works great as a door latch, speaker holder, or mounting element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.

Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.

A screw or bolt with a thread diameter smaller than 6 mm fits this model. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Aesthetic mounting requires selecting the appropriate head size.

The presented product is a ring magnet with dimensions Ø30 mm (outer diameter) and height 10 mm. The key parameter here is the lifting capacity amounting to approximately 20.71 kg (force ~203.16 N). The mounting hole diameter is precisely 6 mm.

The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of rare earth magnets.

Besides their tremendous field intensity, 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),
Magnets perfectly defend themselves against demagnetization caused by foreign field sources,
In other words, due to the aesthetic surface of silver, the element gains visual value,
Magnets are characterized by exceptionally strong magnetic induction on the outer side,
Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
Considering the option of accurate shaping and adaptation to unique needs, magnetic components can be manufactured in a wide range of geometric configurations, which increases their versatility,
Versatile presence in future technologies – they are commonly used in computer drives, motor assemblies, precision medical tools, also multitasking production systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. 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 recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in producing threads and complicated shapes in magnets, we recommend using a housing - magnetic mount.
Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
With budget limitations the cost of neodymium magnets can be a barrier,

Highest magnetic holding force – what it depends on?

Breakaway force was determined for the most favorable conditions, assuming:

with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
possessing a thickness of at least 10 mm to avoid saturation
characterized by even structure
with direct contact (no impurities)
for force acting at a right angle (pull-off, not shear)
in temp. approx. 20°C

Key elements affecting lifting force

Please note that the working load may be lower subject to elements below, in order of importance:

Clearance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
Steel thickness – too thin plate does not close the flux, causing part of the power to be lost into the air.
Material type – ideal substrate is high-permeability steel. Cast iron may have worse magnetic properties.
Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. In addition, even a slight gap {between} the magnet and the plate reduces the lifting capacity.

Warnings

Precision electronics

Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your mobile, device, and navigation systems.

Magnets are brittle

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Medical implants

Patients with a heart stimulator have to keep an large gap from magnets. The magnetism can interfere with the operation of the life-saving device.

Choking Hazard

Product intended for adults. Small elements can be swallowed, causing serious injuries. Keep out of reach of kids and pets.

Respect the power

Exercise caution. Neodymium magnets act from a distance and connect with huge force, often quicker than you can react.

Fire risk

Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Safe distance

Avoid bringing magnets near a purse, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Hand protection

Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Permanent damage

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Sensitization to coating

Some people have a sensitization to Ni, which is the common plating for NdFeB magnets. Prolonged contact may cause dermatitis. We suggest wear safety gloves.

Important!

Details about risks in the article: Magnet Safety Guide.

MP 30x6x10 / N38 - ring magnet

MP 30x6x10 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - technical parameters

1. Montaż na Ścianie (Ześlizg)

2. Wpływ Grubości Blachy

3. Wytrzymałość Temperaturowa

Magnet Pull Force

Magnetic Field

Jak rozdzielać?

Elektronika

Rozruszniki Serca

Nie dla dzieci

Kruchy materiał

Do czego użyć tego magnesu?

Elektronika i Czujniki

Modelarstwo i Druk 3D

Meble i Fronty

View more offers

SM 32x275 [2xM8] / N52 - magnetic separator

UMGW 32x18x8 [M6] GW / N38 - magnetic holder internal thread

SM 18x175 [2xM5] / N42 - magnetic separator

MW 14.9x10 / N38 - cylindrical magnet

Pros and cons of rare earth magnets.

Highest magnetic holding force – what it depends on?

Key elements affecting lifting force

Warnings

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C