Product available Ships today (order by 14:00)

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

product parameters »

16.00 ZŁ with VAT / pcs + price for transport

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Lifting power along with shape of neodymium magnets can be calculated with our online calculation tool.

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Technical details - 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 assembly - technical parameters

These values represent the outcome of a engineering analysis. Values rely on models for the class Nd₂Fe₁₄B. Operational conditions might slightly differ. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - interaction chart
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	strong
10 mm	2404 Gs 240.4 mT	3.79 kg / 3791.3 g 37.2 N	strong
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 drops sharply with every subsequent millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, paint, veneer) noticeably weakens the grip. Magnets operate most effectively in perfect adhesion; air break kills the force. Analyze how rapidly the parameters drop, when the magnet does not adhere flatly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Shear 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 following data defines the estimated weight limit necessary to initiate the shifting of the magnet vertically against a upright metal surface (assuming typical friction). This value is relative to the distance 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 mounting a magnet on a vertical surface (e.g., a board), it you can count on just approx. 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that holders slide 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 painted metal, the holder will slip down under a much lighter load. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Material efficiency (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 thin metal plate is unable to focus the entire magnetic field, which wastes potential of the holder. Should you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's power, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the magnet works worse. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (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

Ordinary NdFeB products lose parameters past the thermal threshold. Watch out for overheating – excessive heat can permanently damage this magnet. With every degree above norm, the magnet's force momentarily drops. Refrain from using this product in hot environments exceeding its safe range. Ignoring the limit will result in destruction of magnetism.

*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - 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 magnetic products attract each other from a wider radius than a magnet and sheet combination. The setup of two magnets generates a stronger field and a wider radius of action. Designing a strong closure? Apply two magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is massive. The levitation is slightly lower than the attraction, but still significant.
*Field value between like poles is approximately ~0 Gs in the exact middle 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
Mobile device	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

Extremely neodym field is a real danger to electronics and pacemakers. These NdFeB products generate a field that destroys function of digital equipment. Remember: the invisible magnetic field passes through tissues and glass. Increased vigilance must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (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. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear eye protection 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)

The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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 magnet pole. Essential parameter in coil applications as well as sensors. P_c value determines the working geometry.

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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*For standard magnets, the max working temp is 80°C.

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

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

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.

Technical specification and ecology

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%

Environmental data

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 very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. 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.

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.

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.

These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:

Their magnetic field remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
Magnets perfectly defend themselves against demagnetization caused by foreign field sources,
Thanks to the metallic finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
Magnetic induction on the top side of the magnet turns out to be extremely intense,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
Possibility of individual modeling as well as adjusting to atypical conditions,
Huge importance in future technologies – they are used in hard drives, motor assemblies, precision medical tools, also multitasking production systems.
Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Cons of neodymium magnets: tips and applications.

To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its 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
Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
Limited ability of producing threads in the magnet and complex forms - recommended is casing - magnetic holder.
Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameters – what contributes to it?

The force parameter is a theoretical maximum value executed under specific, ideal conditions:

with the use of a sheet made of special test steel, guaranteeing maximum field concentration
with a cross-section of at least 10 mm
with an ideally smooth touching surface
under conditions of ideal adhesion (surface-to-surface)
for force applied at a right angle (in the magnet axis)
at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

In practice, the real power results from a number of factors, ranked from most significant:

Distance (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
Load vector – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
Base massiveness – insufficiently thick sheet does not close the flux, causing part of the power to be wasted to the other side.
Material composition – not every steel attracts identically. High carbon content weaken the attraction effect.
Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of neodymium magnets

Demagnetization risk

Do not overheat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Shattering risk

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Pinching danger

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

Electronic hazard

Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Avoid contact if allergic

It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and select versions in plastic housing.

Respect the power

Handle magnets with awareness. Their immense force can shock even professionals. Plan your moves and respect their force.

Phone sensors

GPS units and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Pacemakers

Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Machining danger

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Product not for children

NdFeB magnets are not suitable for play. Eating multiple magnets can lead to them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?

MP 30x6x10 / N38 - ring magnet

Technical details - MP 30x6x10 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - technical parameters

Table 1: Static force (force vs distance) - interaction chart MP 30x6x10 / N38

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

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

Table 4: Material efficiency (saturation) - power losses MP 30x6x10 / N38

Table 5: Working in heat (stability) - thermal limit MP 30x6x10 / N38

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

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

Table 8: Impact energy (kinetic energy) - warning 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. Sliding resistance

2. Efficiency vs thickness

3. Heat tolerance

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

Elemental analysis

Environmental data

Force (pull)

Field Strength

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MP 5x1.5x3 / N38 - ring magnet

Strengths as well as weaknesses of neodymium magnets.

Advantages

Disadvantages

Lifting parameters

Best holding force of the magnet in ideal parameters – what contributes to it?

Impact of factors on magnetic holding capacity in practice

Safe handling of neodymium magnets

Demagnetization risk

Shattering risk

Pinching danger

Electronic hazard

Avoid contact if allergic

Respect the power

Phone sensors

Pacemakers

Machining danger

Product not for children

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - interaction chart
MP 30x6x10 / N38

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

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

Table 4: Material efficiency (saturation) - power losses
MP 30x6x10 / N38

Table 5: Working in heat (stability) - thermal limit
MP 30x6x10 / N38

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

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

Table 8: Impact energy (kinetic energy) - warning
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