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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

check specifications »

16.00 ZŁ with VAT / pcs + price for transport

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Lifting power along with form of a neodymium magnet can be checked on our modular calculator.

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Detailed specification - 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

Engineering modeling of the assembly - technical parameters

These information constitute the result of a physical calculation. Values rely on algorithms for the material Nd₂Fe₁₄B. Actual parameters may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

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	medium risk
10 mm	2404 Gs 240.4 mT	3.79 kg / 3791.3 g 37.2 N	medium risk
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

Pulling power decreases significantly with every mm of gap. Keep in mind that every additional insulation layer (e.g., contamination, paint, rust) strongly weakens the grip. Magnetic products hold most effectively during direct contact; gap nullifies the power. Observe how quickly the load capacity drop, when the product does not touch directly to the metal substrate. When planning the mounting, eliminate additional spacers.

Table 2: Slippage load (wall)
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 defines the approximate force sufficient to start the shifting of the magnet vertically along a vertical steel wall (considering standard friction coefficient). This value varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 placing a magnet on a upright plane (e.g., a board), it will maintain just about 1/5 of its nominal power. Gravity and a weak degree of grip influence the fact that products move down faster than they pull off. Designing a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slide down under a much lighter weight. Application of an anti-slip layer can drastically raise the stability.

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 metal plate cannot take in the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you need a suitably thick element of steel. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the product works worse. We advise picking the steel cross-section based on the following data.

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

Standard neodymium magnets irreversibly lose parameters past the thermal threshold. Watch out for overheating – heat can permanently destroy this product. As the temperature rises, the neodymium's capacity briefly lowers. Avoid using this product in hot environments higher than its safe range. Ignoring the limit will result in irreversible degradation of magnetism.

*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
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 interact from a wider radius than a magnet and sheet combination. Such a system of magnet-to-magnet produces a massive flux and a larger range of operation. Designing a strong closure? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the impact force is huge. The levitation is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Protective zones (implants) - 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
Mobile device	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

Powerful magnet radiation is a large risk to IT equipment as well as medical implants. These neodymiums generate a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Also at risk are: 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 very brittle – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (durability)
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)

Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical 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 in coil applications and motors. The P_c coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: 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. Buoyancy helps in lifting finds.

1. Vertical hold

*Note: On a vertical surface, the magnet holds merely ~20% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

*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) = 0.96

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 magnet with a hole MP 30x6x10 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.

This is a crucial issue when working with model MP 30x6x10 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. 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. Damage to the protective layer during assembly is the most common cause of rusting. 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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 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. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths as well as weaknesses of rare earth magnets.

Pros

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

They do not lose magnetism, even during nearly 10 years – the drop in strength is only ~1% (according to tests),
They retain their magnetic properties even under strong external field,
Thanks to the reflective finish, the plating of nickel, gold-plated, or silver gives an visually attractive appearance,
Magnetic induction on the working layer of the magnet turns out to be impressive,
Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
In view of the option of free forming and customization to specialized projects, NdFeB magnets can be modeled in a broad palette of forms and dimensions, which makes them more universal,
Significant place in future technologies – they are commonly used in mass storage devices, electric drive systems, diagnostic systems, as well as complex engineering applications.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: application proposals

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We recommend casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these products can complicate diagnosis medical in case of swallowing.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

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

The load parameter shown represents the maximum value, measured under laboratory conditions, meaning:

on a base made of structural steel, perfectly concentrating the magnetic flux
with a cross-section of at least 10 mm
with a surface perfectly flat
under conditions of gap-free contact (metal-to-metal)
under vertical application of breakaway force (90-degree angle)
at ambient temperature room level

Magnet lifting force in use – key factors

Please note that the application force may be lower influenced by elements below, starting with the most relevant:

Distance – the presence of any layer (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets

GPS Danger

An intense magnetic field negatively affects the operation of magnetometers in phones and navigation systems. Do not bring magnets near a device to avoid damaging the sensors.

Finger safety

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Immense force

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Mechanical processing

Powder produced during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Adults only

Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Keep out of reach of kids and pets.

Operating temperature

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Medical implants

People with a pacemaker should maintain an absolute distance from magnets. The magnetism can disrupt the operation of the implant.

Material brittleness

Neodymium magnets are sintered ceramics, which means they are very brittle. Collision of two magnets will cause them breaking into small pieces.

Electronic devices

Very strong magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Warning for allergy sufferers

Certain individuals have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling might lead to an allergic reaction. It is best to wear safety gloves.

Caution! Learn more about hazards in the article: Magnet Safety Guide.

MP 30x6x10 / N38 - ring magnet

Detailed specification - 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

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

Table 2: Slippage load (wall) MP 30x6x10 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces MP 30x6x10 / N38

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

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

Table 6: Two magnets (repulsion) - forces in the system MP 30x6x10 / N38

Table 7: Protective zones (implants) - warnings MP 30x6x10 / N38

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

Table 9: Coating parameters (durability) MP 30x6x10 / N38

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

Table 11: Hydrostatics and buoyancy MP 30x6x10 / N38

1. Vertical hold

2. Efficiency vs thickness

3. Heat tolerance

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

Chemical composition

Sustainability

Magnet pull force

Magnetic Induction

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MP 10x7/3.5x3 / N38 - ring magnet

Strengths as well as weaknesses of rare earth magnets.

Pros

Weaknesses

Lifting parameters

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

Magnet lifting force in use – key factors

Safety rules for work with neodymium magnets

GPS Danger

Finger safety

Immense force

Mechanical processing

Adults only

Operating temperature

Medical implants

Material brittleness

Electronic devices

Warning for allergy sufferers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Slippage load (wall)
MP 30x6x10 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 30x6x10 / N38

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

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

Table 6: Two magnets (repulsion) - forces in the system
MP 30x6x10 / N38

Table 7: Protective zones (implants) - warnings
MP 30x6x10 / N38

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

Table 9: Coating parameters (durability)
MP 30x6x10 / N38

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

Table 11: Hydrostatics and buoyancy
MP 30x6x10 / N38