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MP 10x7/3.5x3 / N38 - ring magnet

ring magnet

Catalog no 030180

GTIN/EAN: 5906301811978

5.00

Diameter

10 mm [±0,1 mm]

internal diameter Ø

7/3.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.55 g

Magnetization Direction

↑ axial

Load capacity

1.88 kg / 18.47 N

Magnetic Induction

318.70 mT / 3187 Gs

Coating

[NiCuNi] Nickel

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0.824 ZŁ with VAT / pcs + price for transport

0.670 ZŁ net + 23% VAT / pcs

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Lifting power along with appearance of neodymium magnets can be tested using our power calculator.

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Technical data of the product - MP 10x7/3.5x3 / N38 - ring magnet

Specification / characteristics - MP 10x7/3.5x3 / N38 - ring magnet

properties
properties values
Cat. no. 030180
GTIN/EAN 5906301811978
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 10 mm [±0,1 mm]
internal diameter Ø 7/3.5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 1.55 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.88 kg / 18.47 N
Magnetic Induction ~ ? 318.70 mT / 3187 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 10x7/3.5x3 / 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

Engineering analysis of the product - technical parameters

These data constitute the outcome of a physical calculation. Results were calculated on models for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
MP 10x7/3.5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2813 Gs
281.3 mT
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
 weak grip
1 mm 2373 Gs
237.3 mT
 1.34 kg / 2.95 LBS
1338.1 g / 13.1 N
 weak grip
2 mm 1870 Gs
187.0 mT
 0.83 kg / 1.83 LBS
830.9 g / 8.2 N
 weak grip
3 mm 1416 Gs
141.6 mT
 0.48 kg / 1.05 LBS
476.6 g / 4.7 N
 weak grip
5 mm 785 Gs
78.5 mT
 0.15 kg / 0.32 LBS
146.4 g / 1.4 N
 weak grip
10 mm 214 Gs
21.4 mT
 0.01 kg / 0.02 LBS
10.9 g / 0.1 N
 weak grip
15 mm 81 Gs
8.1 mT
 0.00 kg / 0.00 LBS
1.6 g / 0.0 N
 weak grip
20 mm 38 Gs
3.8 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 weak grip
30 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Magnetic force weakens drastically per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., contamination, paint, rust) significantly diminishes the holding power. Neodymiums work most effectively in perfect adhesion; gap weakens the power. Observe how rapidly the pull force fall, when the product does not adhere flatly to the steel surface. When planning the arrangement, eliminate additional spacers.

Table 2: Shear load (vertical surface)
MP 10x7/3.5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.38 kg / 0.83 LBS
376.0 g / 3.7 N
1 mm Stal (~0.2) 0.27 kg / 0.59 LBS
268.0 g / 2.6 N
2 mm Stal (~0.2) 0.17 kg / 0.37 LBS
166.0 g / 1.6 N
3 mm Stal (~0.2) 0.10 kg / 0.21 LBS
96.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below indicates the estimated shear load needed to cause the slippage of the magnet down against a upright steel plate (considering typical friction). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MP 10x7/3.5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.56 kg / 1.24 LBS
564.0 g / 5.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.38 kg / 0.83 LBS
376.0 g / 3.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.41 LBS
188.0 g / 1.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.94 kg / 2.07 LBS
940.0 g / 9.2 N
When hanging a holder on a vertical surface (e.g., a fridge), it will only hold barely about 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that holders slip faster than they pull off. Want to create a hanger? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the holder will slip down under a much lighter weight. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 10x7/3.5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
1 mm
25%
 0.47 kg / 1.04 LBS
470.0 g / 4.6 N
2 mm
50%
 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
3 mm
75%
 1.41 kg / 3.11 LBS
1410.0 g / 13.8 N
5 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
10 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
11 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
12 mm
100%
 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
A too thin steel is unable to take in the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a weak sheet, the field will pass right through and the attraction force will be weaker. To utilize the maximum of this magnet's power, you require a sufficiently solid backing of metal. The saturation effect means that on delicate walls (e.g., car bodies), the product holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - power drop
MP 10x7/3.5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.88 kg / 4.14 LBS
1880.0 g / 18.4 N
 OK
40 °C -2.2% 1.84 kg / 4.05 LBS
1838.6 g / 18.0 N
 OK
60 °C -4.4% 1.80 kg / 3.96 LBS
1797.3 g / 17.6 N
80 °C -6.6% 1.76 kg / 3.87 LBS
1755.9 g / 17.2 N
100 °C -28.8% 1.34 kg / 2.95 LBS
1338.6 g / 13.1 N
Standard neodymium magnets change their properties power past the thermal threshold. Watch out for overheating – excessive heat can permanently destroy this magnet. With increasing heat, the magnet's capacity temporarily lowers. Refrain from using this magnet close to ovens exceeding its safe range. Exceeding the critical threshold will cause destruction of magnetism.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MP 10x7/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.86 kg / 6.30 LBS
4 419 Gs
0.43 kg / 0.95 LBS
429 g / 4.2 N
 N/A
1 mm 2.46 kg / 5.43 LBS
5 224 Gs
0.37 kg / 0.81 LBS
370 g / 3.6 N
 2.22 kg / 4.89 LBS
~0 Gs
2 mm 2.03 kg / 4.49 LBS
4 747 Gs
0.31 kg / 0.67 LBS
305 g / 3.0 N
 1.83 kg / 4.04 LBS
~0 Gs
3 mm 1.62 kg / 3.58 LBS
4 242 Gs
0.24 kg / 0.54 LBS
244 g / 2.4 N
 1.46 kg / 3.22 LBS
~0 Gs
5 mm 0.96 kg / 2.12 LBS
3 266 Gs
0.14 kg / 0.32 LBS
144 g / 1.4 N
 0.87 kg / 1.91 LBS
~0 Gs
10 mm 0.22 kg / 0.49 LBS
1 570 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.44 LBS
~0 Gs
20 mm 0.02 kg / 0.04 LBS
429 Gs
0.00 kg / 0.01 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
41 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
25 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
16 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
11 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
8 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
6 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnets attract each other from a much further distance than a magnet and steel combination. Such a system 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 steel. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Attention: Results demonstrate shear force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MP 10x7/3.5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a real danger to IT equipment as well as pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation penetrates the body and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MP 10x7/3.5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 35.25 km/h
(9.79 m/s)
 0.07 J
30 mm 60.84 km/h
(16.90 m/s)
 0.22 J
50 mm 78.54 km/h
(21.82 m/s)
 0.37 J
100 mm 111.07 km/h
(30.85 m/s)
 0.74 J
Neodymium magnets are delicate – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can cause material chips or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Coating parameters (durability)
MP 10x7/3.5x3 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MP 10x7/3.5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 899 Mx 19.0 µWb
Pc Coefficient 0.37 Low (Flat)
Flux value passing through the magnet pole. Key data for generator designers and motors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 10x7/3.5x3 / N38

Environment Effective steel pull Effect
Air (land) 1.88 kg Standard
Water (riverbed) 2.15 kg
(+0.27 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.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.37

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: 030180-2026
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The ring magnet with a hole MP 10x7/3.5x3 / N38 is created for permanent mounting, 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. 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 10x7/3.5x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. 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.
A screw or bolt with a thread diameter smaller than 7/3.5 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 Ø10x3 mm and a weight of 1.55 g. The key parameter here is the lifting capacity amounting to approximately 1.88 kg (force ~18.47 N). The mounting hole diameter is precisely 7/3.5 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of Nd2Fe14B magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after approximately 10 years it drops only by ~1% (according to research),
  • They have excellent resistance to magnetic field loss when exposed to external magnetic sources,
  • Thanks to the reflective finish, the coating of nickel, gold-plated, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key 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...
  • Thanks to freedom in designing and the ability to adapt to specific needs,
  • Huge importance in modern industrial fields – they find application in HDD drives, electric motors, medical devices, also technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Additionally, small elements of these magnets can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 1.88 kg is a result of laboratory testing performed under the following configuration:
  • using a base made of low-carbon steel, functioning as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth touching surface
  • with total lack of distance (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

Effective lifting capacity is affected by working environment parameters, such as (from priority):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel does not accept the full field, causing part of the power to be lost to the other side.
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and lifting capacity.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
GPS and phone interference

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can ruin the internal compass in your phone.

Dust is flammable

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Thermal limits

Control the heat. Heating the magnet to high heat will permanently weaken its properties and pulling force.

Nickel allergy

It is widely known that nickel (the usual finish) is a common allergen. For allergy sufferers, prevent direct skin contact and select versions in plastic housing.

Cards and drives

Powerful magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Pacemakers

People with a pacemaker must keep an large gap from magnets. The magnetic field can interfere with the functioning of the implant.

Handling guide

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Magnets are brittle

Neodymium magnets are sintered ceramics, meaning they are very brittle. Clashing of two magnets leads to them shattering into shards.

Bodily injuries

Big blocks can break fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Keep away from children

NdFeB magnets are not toys. Swallowing multiple magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires urgent medical intervention.

Important! Need more info? Check our post: Are neodymium magnets dangerous?