Product available Ships tomorrow

MP 30x6x10 / N38 - ring 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

ring magnet

Catalog no 030197

GTIN/EAN: 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

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16.00 ZŁ with VAT / pcs + price for transport

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Technical parameters of the product - MP 30x6x10 / N38 - ring magnet

Specification / characteristics - MP 30x6x10 / N38 - ring magnet

properties

properties	values
Cat. no.	030197
GTIN/EAN	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	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 simulation of the magnet - data

The following information represent the result of a engineering simulation. Values are based on models for the class Nd₂Fe₁₄B. Operational conditions might slightly deviate from the simulation results. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull 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	crushing
1 mm	5241 Gs 524.1 mT	18.01 kg / 18011.7 g 176.7 N	crushing
2 mm	4861 Gs 486.1 mT	15.50 kg / 15498.1 g 152.0 N	crushing
3 mm	4490 Gs 449.0 mT	13.22 kg / 13223.5 g 129.7 N	crushing
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	safe
20 mm	1000 Gs 100.0 mT	0.66 kg / 655.5 g 6.4 N	safe
30 mm	482 Gs 48.2 mT	0.15 kg / 152.6 g 1.5 N	safe
50 mm	161 Gs 16.1 mT	0.02 kg / 17.0 g 0.2 N	safe

Pulling power weakens drastically with every subsequent millimeter of distance. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) significantly diminishes the holding power. Neodymiums operate most effectively during direct contact; gap nullifies the force. See how rapidly the load capacity fall, when the product does not adhere tightly to the metal substrate. When planning the assembly, discard additional spacers.

Table 2: Slippage capacity (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 table below indicates the approximate shear load required to initiate the slippage of the magnet vertically along a upright steel wall (considering typical friction). This value is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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 element on a upright surface (e.g., a fridge), it will only hold barely about 1/5 of its nominal power. Gravitational force as well as a low friction coefficient mean that products move down easier than they pop off the substrate. Want to create a hanger? Remember that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a significantly smaller weight. Application of an anti-slip coating can effectively raise the stability.

Table 4: Steel thickness (saturation) - 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 too thin steel is incapable of focus the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you require a sufficiently solid element of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet works worse. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal stability (stability) - power drop
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

Ordinary NdFeB products irreversibly lose power past the thermal threshold. Protect against heat – heat can irreversibly destroy this magnet. As the temperature rises, the neodymium's force briefly decreases. Avoid using this magnet close to heaters higher than its working range. Too high temperature will lead to permanent loss of magnetism.

*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization sooner compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
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 magnets attract each other from a much further distance than a neodymium and metal combination. Such a system of two magnets produces a massive flux and a further horizon of operation. Designing a solid fastener? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the pinch force is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center of the gap (due to field cancellation).

Table 7: Hazards (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
Mechanical watch	20 Gs (2.0 mT)	12.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	9.0 cm
Remote	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 real danger to electronics and pacemakers. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
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

Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when playing with large magnets.

Table 9: Corrosion resistance
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. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter	Value	SI Unit / Description
Magnetic Flux	31 585 Mx	315.8 µWb
P_c Coefficient	0.96	High (Stable)

Flux value passing through the pole surface. Key data for generator designers and motors. The P_c coefficient determines the working geometry.

Table 11: Submerged application
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%

Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Warning: On a vertical surface, the magnet retains only ~20% of its max power.

2. Steel thickness impact

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.96

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

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%

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: 030197-2025

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The ring-shaped magnet MP 30x6x10 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables quick installation to wood, wall, plastic, or metal. This product with a force of 20.71 kg works great as a cabinet closure, 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.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. 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.

The inner hole diameter determines the maximum size of the mounting element. 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. Always check that the screw head is not larger than the outer diameter of the magnet (30 mm), so it doesn't protrude beyond the outline.

This model is characterized by dimensions Ø30x10 mm and a weight of 50.89 g. The key parameter here is the holding force 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 neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:

They do not lose power, even during approximately ten years – the reduction in lifting capacity is only ~1% (theoretically),
They are noted for resistance to demagnetization induced by external disturbances,
Thanks to the elegant finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
Magnetic induction on the surface of the magnet is strong,
Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
Possibility of exact forming as well as optimizing to precise applications,
Significant place in modern technologies – they are commonly used in HDD drives, brushless drives, medical equipment, also industrial machines.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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
They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
Limited possibility of producing threads in the magnet and complicated forms - recommended is casing - magnetic holder.
Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Magnet power was defined for ideal contact conditions, taking into account:

on a base made of structural steel, perfectly concentrating the magnetic field
possessing a thickness of min. 10 mm to ensure full flux closure
with a surface cleaned and smooth
with zero gap (without paint)
for force acting at a right angle (pull-off, not shear)
at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

During everyday use, the real power results from many variables, ranked from most significant:

Distance – existence of any layer (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
Metal type – not every steel attracts identically. High carbon content weaken the attraction effect.
Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets

Keep away from children

Strictly store magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.

Sensitization to coating

It is widely known that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from direct skin contact and choose versions in plastic housing.

Keep away from computers

Intense magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Risk of cracking

Neodymium magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets leads to them breaking into small pieces.

Precision electronics

Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Handling rules

Handle with care. Rare earth magnets act from a long distance and snap with huge force, often faster than you can react.

Pacemakers

People with a pacemaker should keep an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.

Finger safety

Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Do not overheat magnets

Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Fire risk

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Warning! Need more info? Check our post: Why are neodymium magnets dangerous?

MP 30x6x10 / N38 - ring magnet

Technical parameters of the product - MP 30x6x10 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the magnet - data

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

Table 2: Slippage capacity (vertical surface) MP 30x6x10 / N38

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

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

Table 5: Thermal stability (stability) - power drop MP 30x6x10 / N38

Table 6: Two magnets (repulsion) - field collision MP 30x6x10 / N38

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

Table 8: Impact energy (kinetic energy) - collision effects MP 30x6x10 / N38

Table 9: Corrosion resistance MP 30x6x10 / N38

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

Table 11: Submerged application MP 30x6x10 / N38

1. Shear force

2. Steel thickness impact

3. Temperature resistance

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

Chemical composition

Sustainability

Force (pull)

Magnetic Induction

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Pros and cons of neodymium magnets.

Pros

Weaknesses

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Magnet lifting force in use – key factors

Precautions when working with NdFeB magnets

Keep away from children

Sensitization to coating

Keep away from computers

Risk of cracking

Precision electronics

Handling rules

Pacemakers

Finger safety

Do not overheat magnets

Fire risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Slippage capacity (vertical surface)
MP 30x6x10 / N38

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

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

Table 5: Thermal stability (stability) - power drop
MP 30x6x10 / N38

Table 6: Two magnets (repulsion) - field collision
MP 30x6x10 / N38

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

Table 8: Impact energy (kinetic energy) - collision effects
MP 30x6x10 / N38

Table 9: Corrosion resistance
MP 30x6x10 / N38

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

Table 11: Submerged application
MP 30x6x10 / N38