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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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Strength as well as structure of a neodymium magnet can be calculated with our modular calculator.

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Technical - 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 modeling of the product - data

The following information constitute the outcome of a physical analysis. Results are based on models for the class Nd2Fe14B. Actual conditions may deviate from the simulation results. Use these data as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - power drop
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 pounds
1880.0 g / 18.4 N
 weak grip
1 mm 2373 Gs
237.3 mT
 1.34 kg / 2.95 pounds
1338.1 g / 13.1 N
 weak grip
2 mm 1870 Gs
187.0 mT
 0.83 kg / 1.83 pounds
830.9 g / 8.2 N
 weak grip
3 mm 1416 Gs
141.6 mT
 0.48 kg / 1.05 pounds
476.6 g / 4.7 N
 weak grip
5 mm 785 Gs
78.5 mT
 0.15 kg / 0.32 pounds
146.4 g / 1.4 N
 weak grip
10 mm 214 Gs
21.4 mT
 0.01 kg / 0.02 pounds
10.9 g / 0.1 N
 weak grip
15 mm 81 Gs
8.1 mT
 0.00 kg / 0.00 pounds
1.6 g / 0.0 N
 weak grip
20 mm 38 Gs
3.8 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 weak grip
30 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Magnetic force weakens drastically with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., dirt, paint, rust) strongly reduces the pull force. Magnetic products operate strongest at the point of direct contact; air break drastically cuts the power. Observe how flashily the pull force plummet, when the product does not adhere flatly to the steel surface. When calculating the mounting, discard redundant distances.

Table 2: Shear hold (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 pounds
376.0 g / 3.7 N
1 mm Stal (~0.2) 0.27 kg / 0.59 pounds
268.0 g / 2.6 N
2 mm Stal (~0.2) 0.17 kg / 0.37 pounds
166.0 g / 1.6 N
3 mm Stal (~0.2) 0.10 kg / 0.21 pounds
96.0 g / 0.9 N
5 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data indicates the approximate force sufficient to start the sliding of the magnet down on a upright steel plate (assuming standard friction). The holding force is a function of the 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 pounds
564.0 g / 5.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.38 kg / 0.83 pounds
376.0 g / 3.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.41 pounds
188.0 g / 1.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
When hanging a holder on a upright wall (e.g., a car body), it you can count on only approx. 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient cause that holders slide down easier than they pull off. Want to create a hanger? Consider that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the element will give way down under a noticeably lighter load. Application of an anti-slip layer can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
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 pounds
188.0 g / 1.8 N
1 mm
25%
 0.47 kg / 1.04 pounds
470.0 g / 4.6 N
2 mm
50%
 0.94 kg / 2.07 pounds
940.0 g / 9.2 N
3 mm
75%
 1.41 kg / 3.11 pounds
1410.0 g / 13.8 N
5 mm
100%
 1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
10 mm
100%
 1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
11 mm
100%
 1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
12 mm
100%
 1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
A thin sheet is incapable of take in the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's power, you need a suitably thick backing of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the holder works worse. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - resistance threshold
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 pounds
1880.0 g / 18.4 N
 OK
40 °C -2.2% 1.84 kg / 4.05 pounds
1838.6 g / 18.0 N
 OK
60 °C -4.4% 1.80 kg / 3.96 pounds
1797.3 g / 17.6 N
80 °C -6.6% 1.76 kg / 3.87 pounds
1755.9 g / 17.2 N
100 °C -28.8% 1.34 kg / 2.95 pounds
1338.6 g / 13.1 N
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Protect against heat – heat can irreversibly damage this magnet. With every degree above norm, the magnet's power briefly decreases. Avoid using this magnet close to heaters exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 10x7/3.5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.86 kg / 6.30 pounds
4 419 Gs
0.43 kg / 0.95 pounds
429 g / 4.2 N
 N/A
1 mm 2.46 kg / 5.43 pounds
5 224 Gs
0.37 kg / 0.81 pounds
370 g / 3.6 N
 2.22 kg / 4.89 pounds
~0 Gs
2 mm 2.03 kg / 4.49 pounds
4 747 Gs
0.31 kg / 0.67 pounds
305 g / 3.0 N
 1.83 kg / 4.04 pounds
~0 Gs
3 mm 1.62 kg / 3.58 pounds
4 242 Gs
0.24 kg / 0.54 pounds
244 g / 2.4 N
 1.46 kg / 3.22 pounds
~0 Gs
5 mm 0.96 kg / 2.12 pounds
3 266 Gs
0.14 kg / 0.32 pounds
144 g / 1.4 N
 0.87 kg / 1.91 pounds
~0 Gs
10 mm 0.22 kg / 0.49 pounds
1 570 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
 0.20 kg / 0.44 pounds
~0 Gs
20 mm 0.02 kg / 0.04 pounds
429 Gs
0.00 kg / 0.01 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
41 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
25 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
16 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
6 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 significantly greater distance than a neodymium and metal combination. Such a system of magnet-to-magnet produces a massive flux and a further horizon of action. Planning to create a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the collision energy is massive. The repulsion force is slightly lower than the attraction, but still large.
*The magnetic induction for N-N configuration reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Figures show sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (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
Mobile device 40 Gs (4.0 mT) 2.0 cm
Remote 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
A strong magnetic field is a large risk to IT equipment and pacemakers. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - 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
Magnetic elements are prone to chipping – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or injury to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when playing with powerful specimens.

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)
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: Construction data (Flux)
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 emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

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

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*For standard magnets, the safety limit 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.

Technical specification and ecology
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%
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
Measurement Calculator
Force (pull)
Magnetic Induction
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The ring-shaped magnet 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. This product with a force of 1.88 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. 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
A screw or bolt with a thread diameter smaller than 7/3.5 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 (10 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 10 mm and thickness 3 mm. The pulling force of this model is an impressive 1.88 kg, which translates to 18.47 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They retain full power for nearly ten years – the loss is just ~1% (based on simulations),
  • They have excellent resistance to weakening of magnetic properties as a result of external fields,
  • A magnet with a shiny nickel surface has better aesthetics,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Possibility of exact forming as well as modifying to atypical applications,
  • Universal use in advanced technology sectors – they are utilized in computer drives, electromotive mechanisms, precision medical tools, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Characteristics of disadvantages 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 advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The declared magnet strength refers to the limit force, recorded under laboratory conditions, meaning:
  • on a plate made of mild steel, effectively closing the magnetic field
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by working environment parameters, such as (from priority):
  • Gap (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Load vector – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Metal type – not every steel attracts identically. Alloy additives weaken the attraction effect.
  • Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Danger to the youngest

These products are not toys. Accidental ingestion of a few magnets can lead to them attracting across intestines, which constitutes a critical condition and necessitates urgent medical intervention.

Demagnetization risk

Control the heat. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.

GPS and phone interference

A powerful magnetic field disrupts the operation of compasses in smartphones and navigation systems. Keep magnets close to a device to avoid breaking the sensors.

Safe distance

Intense magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Handling guide

Be careful. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can react.

Medical implants

People with a heart stimulator should keep an safe separation from magnets. The magnetic field can stop the operation of the implant.

Dust is flammable

Powder generated during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Allergy Warning

Certain individuals have a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching might lead to dermatitis. We suggest wear safety gloves.

Bone fractures

Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Beware of splinters

NdFeB magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them breaking into shards.

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