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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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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Weight along with appearance of neodymium magnets can be analyzed using our force calculator.

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Technical of the product - 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 magnet - data

The following values are the result of a mathematical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these calculations as a reference point when designing systems.

Table 1: Static pull force (pull vs distance) - interaction chart
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
 medium risk
1 mm 1015 Gs
101.5 mT
 3.48 kg / 7.67 LBS
3477.6 g / 34.1 N
 medium risk
2 mm 980 Gs
98.0 mT
 3.24 kg / 7.14 LBS
3240.7 g / 31.8 N
 medium risk
3 mm 936 Gs
93.6 mT
 2.95 kg / 6.51 LBS
2951.6 g / 29.0 N
 medium risk
5 mm 827 Gs
82.7 mT
 2.31 kg / 5.08 LBS
2305.8 g / 22.6 N
 medium risk
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
Magnetic force decreases drastically per each millimeter of distance. Remember that even the smallest gap (e.g., dirt, paint, rust) strongly reduces the pull force. Neodymiums work optimally during direct contact; distance nullifies the force. Observe how flashily the parameters plummet, when the magnet does not touch directly to the metal substrate. When designing the mounting, eliminate unnecessary gaps.

Table 2: Slippage capacity (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
This section presents the approximate shear load necessary to cause the shifting of the magnet vertically along a vertical metal surface (assuming standard friction coefficient). This parameter is a function of the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - 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 mounting a magnet on a upright surface (e.g., a board), it you can count on only about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient mean that magnets slide down faster than they detach. Designing a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a significantly smaller cargo. Utilizing a rubberized layer can significantly improve the result.

Table 4: Material efficiency (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 thin metal plate is not enough to focus the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To utilize the maximum of this neodymium's potential, you need a suitably thick backing of metal. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the product works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - thermal limit
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
Ordinary NdFeB products lose power above the temperature limit. Watch out for overheating – heat can irreversibly demagnetize this magnet. As the temperature rises, the magnet's power briefly drops. Refrain from using this magnet close to heaters higher than its safe range. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress than long magnets. Red status in the table points to 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 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 magnetic products interact from a wider radius than a neodymium and metal setup. The connection of two magnets produces a massive flux and a further horizon of action. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the collision energy is huge. The repulsion force is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the midpoint of the gap (due to field cancellation).
Note: Estimates refer to friction force of two same magnets (friction coefficient ~0.15 for Ni-Ni coating).

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
Mechanical watch 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
Extremely neodym field poses a large risk to electronics and medical implants. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation passes through tissues and glass. Exceptional care must be exercised by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (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 delicate – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or injury to skin. Be sure to control the product during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Surface protection spec
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient determines 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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
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)

*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Heat tolerance

*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

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
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: 030250-2026
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The ring-shaped magnet MP 30x7/3x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 3.64 kg works great as a door latch, speaker holder, or mounting element in devices.
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. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing magnets in hermetic housing 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 mounting hole diameter is precisely 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 as well as disadvantages of Nd2Fe14B magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They retain attractive force for around 10 years – the drop is just ~1% (based on simulations),
  • They do not lose their magnetic properties even under external field action,
  • By applying a smooth coating of silver, the element has an nice look,
  • Magnetic induction on the working part of the magnet is impressive,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • In view of the potential of free molding and customization to specialized requirements, magnetic components can be produced in a broad palette of geometric configurations, which makes them more universal,
  • Wide application in modern industrial fields – they are utilized in computer drives, electric motors, medical devices, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • 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 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 stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited ability of making nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a measurement result performed under specific, ideal conditions:
  • on a plate made of mild steel, effectively closing the magnetic field
  • whose thickness equals approx. 10 mm
  • with a plane cleaned and smooth
  • with direct contact (without impurities)
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Impact of factors on magnetic holding capacity in practice

Please note that the magnet holding may be lower depending on elements below, in order of importance:
  • Distance (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be lost into the air.
  • Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Magnet fragility

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Clashing of two magnets will cause them shattering into small pieces.

Mechanical processing

Fire hazard: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Finger safety

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Cards and drives

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

Thermal limits

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

This is not a toy

Adult use only. Small elements can be swallowed, causing intestinal necrosis. Store away from kids and pets.

Nickel coating and allergies

Studies show that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, avoid direct skin contact or select coated magnets.

Medical implants

Patients with a heart stimulator have to maintain an safe separation from magnets. The magnetic field can disrupt the operation of the implant.

GPS Danger

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

Handling rules

Handle with care. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can react.

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