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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

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6.84 ZŁ with VAT / pcs + price for transport

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Detailed specification - 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 simulation of the product - data

These values are the outcome of a physical simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static pull 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 LBS
3640.0 g / 35.7 N
 strong
1 mm 1015 Gs
101.5 mT
 3.48 kg / 7.67 LBS
3477.6 g / 34.1 N
 strong
2 mm 980 Gs
98.0 mT
 3.24 kg / 7.14 LBS
3240.7 g / 31.8 N
 strong
3 mm 936 Gs
93.6 mT
 2.95 kg / 6.51 LBS
2951.6 g / 29.0 N
 strong
5 mm 827 Gs
82.7 mT
 2.31 kg / 5.08 LBS
2305.8 g / 22.6 N
 strong
10 mm 539 Gs
53.9 mT
 0.98 kg / 2.16 LBS
981.0 g / 9.6 N
 weak grip
15 mm 329 Gs
32.9 mT
 0.37 kg / 0.80 LBS
365.1 g / 3.6 N
 weak grip
20 mm 202 Gs
20.2 mT
 0.14 kg / 0.30 LBS
137.9 g / 1.4 N
 weak grip
30 mm 85 Gs
8.5 mT
 0.02 kg / 0.05 LBS
24.6 g / 0.2 N
 weak grip
50 mm 23 Gs
2.3 mT
 0.00 kg / 0.00 LBS
1.8 g / 0.0 N
 weak grip
Grip strength decreases drastically per each millimeter of spacing. Remember that even a very thin break (e.g., dirt, paint, rust) strongly weakens the grip. Neodymiums work strongest at the point of direct contact; distance nullifies the power. Analyze how rapidly the pull force drop, when the product does not adhere flatly to the metal substrate. When planning the assembly, discard redundant distances.

Table 2: Sliding 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 LBS
728.0 g / 7.1 N
1 mm Stal (~0.2) 0.70 kg / 1.53 LBS
696.0 g / 6.8 N
2 mm Stal (~0.2) 0.65 kg / 1.43 LBS
648.0 g / 6.4 N
3 mm Stal (~0.2) 0.59 kg / 1.30 LBS
590.0 g / 5.8 N
5 mm Stal (~0.2) 0.46 kg / 1.02 LBS
462.0 g / 4.5 N
10 mm Stal (~0.2) 0.20 kg / 0.43 LBS
196.0 g / 1.9 N
15 mm Stal (~0.2) 0.07 kg / 0.16 LBS
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 LBS
28.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data calculates the estimated weight limit necessary to cause the downward movement of the magnet vertically along a upright metal surface (assuming typical friction coefficient). This parameter varies with the distance between the magnet and the metal.

Table 3: Wall mounting (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 LBS
1092.0 g / 10.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.73 kg / 1.60 LBS
728.0 g / 7.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.36 kg / 0.80 LBS
364.0 g / 3.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.82 kg / 4.01 LBS
1820.0 g / 17.9 N
When hanging a holder on a upright plane (e.g., a car body), it will only hold barely approx. 1/5 of nominal attraction strength. Gravity and a weak degree of grip mean that magnets slip easier than they detach. Designing a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the element will give way down under a significantly smaller load. Utilizing a rubberized layer can significantly raise the stability.

Table 4: Steel thickness (saturation) - power losses
MP 30x7/3x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.36 kg / 0.80 LBS
364.0 g / 3.6 N
1 mm
25%
 0.91 kg / 2.01 LBS
910.0 g / 8.9 N
2 mm
50%
 1.82 kg / 4.01 LBS
1820.0 g / 17.9 N
3 mm
75%
 2.73 kg / 6.02 LBS
2730.0 g / 26.8 N
5 mm
100%
 3.64 kg / 8.02 LBS
3640.0 g / 35.7 N
10 mm
100%
 3.64 kg / 8.02 LBS
3640.0 g / 35.7 N
11 mm
100%
 3.64 kg / 8.02 LBS
3640.0 g / 35.7 N
12 mm
100%
 3.64 kg / 8.02 LBS
3640.0 g / 35.7 N
A too thin steel is not enough to absorb the full magnetic flux, which weakens actual performance of the holder. If you attach a powerful product to a too thin substrate, the flux will pass right through and the holding will be smaller. To achieve the maximum of this neodymium's power, you need a suitably thick element of steel. The saturation effect means that on thin elements (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel cross-section from these parameters.

Table 5: Working in heat (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 LBS
3640.0 g / 35.7 N
 OK
40 °C -2.2% 3.56 kg / 7.85 LBS
3559.9 g / 34.9 N
 OK
60 °C -4.4% 3.48 kg / 7.67 LBS
3479.8 g / 34.1 N
80 °C -6.6% 3.40 kg / 7.50 LBS
3399.8 g / 33.4 N
100 °C -28.8% 2.59 kg / 5.71 LBS
2591.7 g / 25.4 N
Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly destroy this product. As the temperature rises, the magnet's force momentarily lowers. Avoid using this magnet close to ovens exceeding its operating temperature limit. Ignoring the limit will cause destruction of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than long magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 30x7/3x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.96 kg / 8.73 LBS
1 995 Gs
0.59 kg / 1.31 LBS
594 g / 5.8 N
 N/A
1 mm 3.88 kg / 8.56 LBS
2 058 Gs
0.58 kg / 1.28 LBS
582 g / 5.7 N
 3.49 kg / 7.70 LBS
~0 Gs
2 mm 3.78 kg / 8.34 LBS
2 031 Gs
0.57 kg / 1.25 LBS
567 g / 5.6 N
 3.40 kg / 7.50 LBS
~0 Gs
3 mm 3.66 kg / 8.07 LBS
1 998 Gs
0.55 kg / 1.21 LBS
549 g / 5.4 N
 3.30 kg / 7.26 LBS
~0 Gs
5 mm 3.37 kg / 7.43 LBS
1 918 Gs
0.51 kg / 1.12 LBS
506 g / 5.0 N
 3.04 kg / 6.69 LBS
~0 Gs
10 mm 2.51 kg / 5.53 LBS
1 654 Gs
0.38 kg / 0.83 LBS
376 g / 3.7 N
 2.26 kg / 4.97 LBS
~0 Gs
20 mm 1.07 kg / 2.35 LBS
1 079 Gs
0.16 kg / 0.35 LBS
160 g / 1.6 N
 0.96 kg / 2.12 LBS
~0 Gs
50 mm 0.06 kg / 0.13 LBS
258 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
 0.05 kg / 0.12 LBS
~0 Gs
60 mm 0.03 kg / 0.06 LBS
171 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
70 mm 0.01 kg / 0.03 LBS
118 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
80 mm 0.01 kg / 0.01 LBS
84 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.01 LBS
62 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
47 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a wider radius of action. Designing a powerful holder? Apply two magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still impressive.
*Flux density for N-N configuration drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Important: Estimates apply to sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 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 real danger to electronics as well as medical implants. These magnets produce a flux that destroys function of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - 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 very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Anti-corrosion coating 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

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 passing through the magnet pole. Key data for generator designers as well as sensors. Pc value 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%
Corrosion 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. Wall mount (shear)

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

2. Efficiency vs thickness

*Thin steel (e.g. computer case) significantly reduces 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 Pc (Permeance Coefficient) = 0.13

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 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.

Engineering data and GPSR
Material specification
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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The ring magnet with a hole MP 30x7/3x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 3.64 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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 does not ensure full waterproofing. 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 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 holding force 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. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of rare earth magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They are noted for resistance to demagnetization induced by external field influence,
  • By using a lustrous layer of silver, the element gains an modern look,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Thanks to freedom in shaping and the capacity to adapt to unusual requirements,
  • Universal use in modern technologies – they serve a role in mass storage devices, drive modules, precision medical tools, also multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

What to avoid - cons of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their force 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 stability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of making threads in the magnet and complicated forms - recommended is a housing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Information about lifting capacity was determined for optimal configuration, taking into account:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • whose thickness is min. 10 mm
  • with an ideally smooth contact surface
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding may be lower subject to the following factors, starting with the most relevant:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Warnings
Bone fractures

Large magnets can crush fingers instantly. Do not put your hand betwixt two strong magnets.

GPS Danger

Remember: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your phone, device, and GPS.

Beware of splinters

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Product not for children

Adult use only. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Fire warning

Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Operating temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Do not underestimate power

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can react.

Magnetic media

Very strong magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease working with magnets and use protective gear.

Warning for heart patients

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Warning! Need more info? Read our article: Are neodymium magnets dangerous?