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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

product parameters »

6.84 ZŁ with VAT / pcs + price for transport

5.56 ZŁ net + 23% VAT / pcs

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Force as well as form of neodymium magnets can be analyzed with our force 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

Physical analysis of the magnet - technical parameters

These values represent the result of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual performance might slightly differ. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
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
 strong
1 mm 1015 Gs
101.5 mT
 3.48 kg / 7.67 pounds
3477.6 g / 34.1 N
 strong
2 mm 980 Gs
98.0 mT
 3.24 kg / 7.14 pounds
3240.7 g / 31.8 N
 strong
3 mm 936 Gs
93.6 mT
 2.95 kg / 6.51 pounds
2951.6 g / 29.0 N
 strong
5 mm 827 Gs
82.7 mT
 2.31 kg / 5.08 pounds
2305.8 g / 22.6 N
 strong
10 mm 539 Gs
53.9 mT
 0.98 kg / 2.16 pounds
981.0 g / 9.6 N
 weak grip
15 mm 329 Gs
32.9 mT
 0.37 kg / 0.80 pounds
365.1 g / 3.6 N
 weak grip
20 mm 202 Gs
20.2 mT
 0.14 kg / 0.30 pounds
137.9 g / 1.4 N
 weak grip
30 mm 85 Gs
8.5 mT
 0.02 kg / 0.05 pounds
24.6 g / 0.2 N
 weak grip
50 mm 23 Gs
2.3 mT
 0.00 kg / 0.00 pounds
1.8 g / 0.0 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of spacing. Note that even a very thin break (e.g., dirt, paint, dust) noticeably diminishes the holding power. Magnets work optimally at the point of direct contact; gap drastically cuts the power. Observe how rapidly the load capacity fall, when the product does not touch tightly to the metal substrate. When planning the mounting, discard unnecessary gaps.

Table 2: Vertical load (vertical surface)
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 indicates the theoretical weight limit required to cause the shifting of the magnet vertically on a upright metal surface (assuming typical friction coefficient). This parameter varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 mounting a holder on a vertical surface (e.g., a car body), it will only hold just approx. 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient cause that magnets slide down faster than they pop off the substrate. Planning a vertical fastening? Note that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slip down under a noticeably lighter cargo. Using a rubber layer can significantly raise the stability.

Table 4: Steel thickness (saturation) - 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 sheet cannot conduct the full magnetic flux, which squanders power of the magnet. Should you attach a powerful product to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's power, you need a suitably thick backing of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - resistance threshold
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
Ordinary NdFeB products lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly destroy this magnet. As the temperature rises, the magnet's power temporarily lowers. Do not use this magnet close to heaters higher than its working range. Ignoring the limit will lead to permanent loss of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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 magnetic products interact from a much further distance than a magnet and steel combination. The setup of two magnets generates a stronger field and a larger range of operation. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The levitation is marginally weaker than the attraction, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Important: Calculations show sliding force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
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
Mechanical watch 20 Gs (2.0 mT) 5.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.5 cm
Remote 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
A strong magnetic field is a large risk to electronics and medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and plastic. Special caution must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
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
Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can cause material chips or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when handling with large magnets.

Table 9: Coating parameters (durability)
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. Note the thickness of the protective layer.

Table 10: Construction 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)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*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 limits the holding force.

3. Thermal stability

*For N38 material, the safety limit 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 and environmental data
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%
Ecology and recycling (GPSR)
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
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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 is a crucial issue when working with model MP 30x7/3x3 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 7/3 mm fits this model. 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 Ø30x3 mm and a weight of 15.75 g. The key parameter here is the lifting capacity amounting to approximately 3.64 kg (force ~35.69 N). The mounting hole diameter is precisely 7/3 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.

Pros and cons of rare earth magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after nearly ten years – the drop in lifting capacity is only ~1% (theoretically),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • By using a reflective layer of silver, the element has an professional look,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • In view of the option of flexible forming and adaptation to individualized solutions, magnetic components can be produced in a broad palette of geometric configurations, which increases their versatility,
  • Universal use in modern technologies – they are utilized in HDD drives, brushless drives, medical devices, as well as multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating nuts in the magnet and complicated shapes - recommended is cover - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

The specified lifting capacity refers to the peak performance, obtained under ideal test conditions, meaning:
  • using a sheet made of low-carbon steel, serving as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • with a plane perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at temperature room level

What influences lifting capacity in practice

During everyday use, the actual holding force depends on a number of factors, presented from crucial:
  • Clearance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be escaped to the other side.
  • Material type – the best choice is high-permeability steel. Cast iron may attract less.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Handling guide

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Maximum temperature

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Keep away from computers

Data protection: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Crushing risk

Risk of injury: The pulling power is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Do not give to children

Adult use only. Tiny parts pose a choking risk, leading to intestinal necrosis. Store away from kids and pets.

Mechanical processing

Dust generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Magnets are brittle

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets leads to them breaking into shards.

Pacemakers

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Nickel coating and allergies

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 or opt for encased magnets.

Precision electronics

A strong magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Do not bring magnets near a device to avoid damaging the sensors.

Caution! Looking for details? Check our post: Are neodymium magnets dangerous?