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MP 30x7/3x3 / N38 - ring magnet

ring magnet

Catalog no 030250

GTIN/EAN: 5906301812265

5.00

Diameter

30 mm [±0,1 mm]

internal diameter Ø

7/3 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

15.75 g

Magnetization Direction

↑ axial

Load capacity

3.64 kg / 35.69 N

Magnetic Induction

121.58 mT / 1216 Gs

Coating

[NiCuNi] Nickel

view properties »

6.84 ZŁ with VAT / pcs + price for transport

5.56 ZŁ net + 23% VAT / pcs

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Parameters as well as shape of a neodymium magnet can be tested on our magnetic calculator.

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Product card - MP 30x7/3x3 / N38 - ring magnet

Specification / characteristics - MP 30x7/3x3 / N38 - ring magnet

properties
properties values
Cat. no. 030250
GTIN/EAN 5906301812265
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 7/3 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 15.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 3.64 kg / 35.69 N
Magnetic Induction ~ ? 121.58 mT / 1216 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 30x7/3x3 / 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

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

Technical analysis of the magnet - data

The following data represent the outcome of a engineering simulation. Results rely on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - power drop
MP 30x7/3x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1039 Gs
103.9 mT
 3.64 kg / 8.02 pounds
3640.0 g / 35.7 N
 medium risk
1 mm 1015 Gs
101.5 mT
 3.48 kg / 7.67 pounds
3477.6 g / 34.1 N
 medium risk
2 mm 980 Gs
98.0 mT
 3.24 kg / 7.14 pounds
3240.7 g / 31.8 N
 medium risk
3 mm 936 Gs
93.6 mT
 2.95 kg / 6.51 pounds
2951.6 g / 29.0 N
 medium risk
5 mm 827 Gs
82.7 mT
 2.31 kg / 5.08 pounds
2305.8 g / 22.6 N
 medium risk
10 mm 539 Gs
53.9 mT
 0.98 kg / 2.16 pounds
981.0 g / 9.6 N
 low risk
15 mm 329 Gs
32.9 mT
 0.37 kg / 0.80 pounds
365.1 g / 3.6 N
 low risk
20 mm 202 Gs
20.2 mT
 0.14 kg / 0.30 pounds
137.9 g / 1.4 N
 low risk
30 mm 85 Gs
8.5 mT
 0.02 kg / 0.05 pounds
24.6 g / 0.2 N
 low risk
50 mm 23 Gs
2.3 mT
 0.00 kg / 0.00 pounds
1.8 g / 0.0 N
 low risk
Pulling power drops sharply with every subsequent millimeter of spacing. Remember that every additional insulation layer (e.g., contamination, paint, rust) significantly diminishes the holding power. Neodymiums operate optimally at the point of direct contact; gap kills the power. Observe how quickly the parameters fall, when the magnet does not adhere directly to the steel surface. When calculating the mounting, avoid redundant distances.

Table 2: Slippage force (wall)
MP 30x7/3x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.73 kg / 1.60 pounds
728.0 g / 7.1 N
1 mm Stal (~0.2) 0.70 kg / 1.53 pounds
696.0 g / 6.8 N
2 mm Stal (~0.2) 0.65 kg / 1.43 pounds
648.0 g / 6.4 N
3 mm Stal (~0.2) 0.59 kg / 1.30 pounds
590.0 g / 5.8 N
5 mm Stal (~0.2) 0.46 kg / 1.02 pounds
462.0 g / 4.5 N
10 mm Stal (~0.2) 0.20 kg / 0.43 pounds
196.0 g / 1.9 N
15 mm Stal (~0.2) 0.07 kg / 0.16 pounds
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section shows the theoretical holding capacity necessary to initiate the downward movement of the magnet down on a upright steel wall (assuming typical friction coefficient). This parameter is relative to the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MP 30x7/3x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.09 kg / 2.41 pounds
1092.0 g / 10.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.73 kg / 1.60 pounds
728.0 g / 7.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.36 kg / 0.80 pounds
364.0 g / 3.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.82 kg / 4.01 pounds
1820.0 g / 17.9 N
When placing a element on a upright wall (e.g., a fridge), it you can count on just approx. 1/5 of its nominal power. Gravitational force as well as a low friction coefficient cause that holders slip easier than they pull off. Planning a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a noticeably lighter load. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 30x7/3x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.36 kg / 0.80 pounds
364.0 g / 3.6 N
1 mm
25%
 0.91 kg / 2.01 pounds
910.0 g / 8.9 N
2 mm
50%
 1.82 kg / 4.01 pounds
1820.0 g / 17.9 N
3 mm
75%
 2.73 kg / 6.02 pounds
2730.0 g / 26.8 N
5 mm
100%
 3.64 kg / 8.02 pounds
3640.0 g / 35.7 N
10 mm
100%
 3.64 kg / 8.02 pounds
3640.0 g / 35.7 N
11 mm
100%
 3.64 kg / 8.02 pounds
3640.0 g / 35.7 N
12 mm
100%
 3.64 kg / 8.02 pounds
3640.0 g / 35.7 N
A thin metal plate is unable to conduct the full magnetic flux, which weakens actual performance of the magnet. Should you attach a powerful product to a thin surface, the field will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's potential, you need a suitably thick backing of steel. The material oversaturation means that on thin elements (e.g., car bodies), the magnet shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - power drop
MP 30x7/3x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.64 kg / 8.02 pounds
3640.0 g / 35.7 N
 OK
40 °C -2.2% 3.56 kg / 7.85 pounds
3559.9 g / 34.9 N
 OK
60 °C -4.4% 3.48 kg / 7.67 pounds
3479.8 g / 34.1 N
80 °C -6.6% 3.40 kg / 7.50 pounds
3399.8 g / 33.4 N
100 °C -28.8% 2.59 kg / 5.71 pounds
2591.7 g / 25.4 N
Classic neodymiums irreversibly lose power above the temperature limit. Avoid high temperatures – heat can permanently damage this product. As the temperature rises, the magnet's power briefly lowers. Refrain from using this product in hot environments exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 30x7/3x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.96 kg / 8.73 pounds
1 995 Gs
0.59 kg / 1.31 pounds
594 g / 5.8 N
 N/A
1 mm 3.88 kg / 8.56 pounds
2 058 Gs
0.58 kg / 1.28 pounds
582 g / 5.7 N
 3.49 kg / 7.70 pounds
~0 Gs
2 mm 3.78 kg / 8.34 pounds
2 031 Gs
0.57 kg / 1.25 pounds
567 g / 5.6 N
 3.40 kg / 7.50 pounds
~0 Gs
3 mm 3.66 kg / 8.07 pounds
1 998 Gs
0.55 kg / 1.21 pounds
549 g / 5.4 N
 3.30 kg / 7.26 pounds
~0 Gs
5 mm 3.37 kg / 7.43 pounds
1 918 Gs
0.51 kg / 1.12 pounds
506 g / 5.0 N
 3.04 kg / 6.69 pounds
~0 Gs
10 mm 2.51 kg / 5.53 pounds
1 654 Gs
0.38 kg / 0.83 pounds
376 g / 3.7 N
 2.26 kg / 4.97 pounds
~0 Gs
20 mm 1.07 kg / 2.35 pounds
1 079 Gs
0.16 kg / 0.35 pounds
160 g / 1.6 N
 0.96 kg / 2.12 pounds
~0 Gs
50 mm 0.06 kg / 0.13 pounds
258 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.05 kg / 0.12 pounds
~0 Gs
60 mm 0.03 kg / 0.06 pounds
171 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
70 mm 0.01 kg / 0.03 pounds
118 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
80 mm 0.01 kg / 0.01 pounds
84 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
62 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
47 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and steel setup. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is extreme. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density between like poles drops to ~0 Gs in the exact middle between the magnets (due to field cancellation).
Important: Estimates demonstrate shear force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MP 30x7/3x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Car key 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a real danger to electronics and medical implants. These neodymiums produce a field that disrupts operation of digital equipment. Notice: the unseen radiation penetrates the body and glass. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MP 30x7/3x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.73 km/h
(4.92 m/s)
 0.19 J
30 mm 26.67 km/h
(7.41 m/s)
 0.43 J
50 mm 34.29 km/h
(9.53 m/s)
 0.71 J
100 mm 48.48 km/h
(13.47 m/s)
 1.43 J
NdFeB products are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can cause material chips or dangerous crushing to fingers. 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 working with powerful specimens.

Table 9: Corrosion resistance
MP 30x7/3x3 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MP 30x7/3x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 395 Mx 84.0 µWb
Pc Coefficient 0.13 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 30x7/3x3 / N38

Environment Effective steel pull Effect
Air (land) 3.64 kg Standard
Water (riverbed) 4.17 kg
(+0.53 kg buoyancy gain)
+14.5%
Rust risk: 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. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

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

2. Plate thickness effect

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

3. Temperature resistance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13

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 Pc (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 Pc 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
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: 030250-2026
Magnet Unit Converter
Pulling force
Magnetic Induction
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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø30 mm (outer diameter) and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 3.64 kg (force ~35.69 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 7/3 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.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
  • Magnets perfectly resist against loss of magnetization caused by external fields,
  • By applying a shiny coating of nickel, the element acquires an nice look,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
  • 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...
  • Thanks to modularity in shaping and the ability to adapt to complex applications,
  • Key role in future technologies – they find application in HDD drives, drive modules, medical equipment, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Cons

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Magnetic strength at its maximum – what affects it?

The declared magnet strength represents the peak performance, recorded under ideal test conditions, specifically:
  • using a plate made of low-carbon steel, acting as a magnetic yoke
  • whose thickness equals approx. 10 mm
  • with a surface perfectly flat
  • with zero gap (no paint)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

In practice, the real power depends on a number of factors, listed from crucial:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Plate material – mild steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Warnings
ICD Warning

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Do not give to children

NdFeB magnets are not suitable for play. Eating several magnets may result in them attracting across intestines, which poses a critical condition and requires immediate surgery.

Serious injuries

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

Threat to navigation

Navigation devices and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Demagnetization risk

Keep cool. Neodymium magnets are sensitive to heat. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Magnets are brittle

NdFeB magnets are ceramic materials, which means they are very brittle. Clashing of two magnets leads to them cracking into shards.

Respect the power

Be careful. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can move away.

Keep away from computers

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, medical aids, timepieces).

Fire risk

Powder produced during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Metal Allergy

Studies show that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent touching magnets with bare hands or select encased magnets.

Danger! Want to know more? Check our post: Why are neodymium magnets dangerous?