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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

0.824 with VAT / pcs + price for transport

0.670 ZŁ net + 23% VAT / pcs

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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

Technical modeling of the magnet - data

These information represent the direct effect of a mathematical analysis. Values rely on algorithms for the class Nd2Fe14B. Actual performance may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
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
safe
1 mm 2373 Gs
237.3 mT
1.34 kg / 2.95 pounds
1338.1 g / 13.1 N
safe
2 mm 1870 Gs
187.0 mT
0.83 kg / 1.83 pounds
830.9 g / 8.2 N
safe
3 mm 1416 Gs
141.6 mT
0.48 kg / 1.05 pounds
476.6 g / 4.7 N
safe
5 mm 785 Gs
78.5 mT
0.15 kg / 0.32 pounds
146.4 g / 1.4 N
safe
10 mm 214 Gs
21.4 mT
0.01 kg / 0.02 pounds
10.9 g / 0.1 N
safe
15 mm 81 Gs
8.1 mT
0.00 kg / 0.00 pounds
1.6 g / 0.0 N
safe
20 mm 38 Gs
3.8 mT
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
safe
30 mm 12 Gs
1.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 3 Gs
0.3 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Shear load (wall)
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

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

Table 4: Steel thickness (saturation) - 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 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

Table 5: Thermal stability (stability) - 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 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

Table 6: Two magnets (attraction) - forces in the system
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 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

Table 7: Protective zones (implants) - precautionary measures
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

Table 8: Impact energy (kinetic energy) - warning
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

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)

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)

Table 11: Submerged application
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

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

2. Plate thickness effect

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

3. Power loss vs temp

*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) = 0.37

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 and environmental data
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: 030180-2026
Magnet Unit Converter
Pulling force

Magnetic Field

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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. Mounting is clean and reversible, unlike gluing. This product with a force of 1.88 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
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. When tightening the screw, you must maintain caution. 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 easily scratched 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. 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 pulling force of this model is an impressive 1.88 kg, which translates to 18.47 N in newtons. The mounting hole diameter is precisely 7/3.5 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • Their strength is maintained, and after approximately ten years it decreases only by ~1% (theoretically),
  • They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets are distinguished by exceptionally strong magnetic induction on the working surface,
  • 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...
  • Due to the potential of precise molding and adaptation to custom requirements, neodymium magnets can be produced in a wide range of geometric configurations, which expands the range of possible applications,
  • Fundamental importance in electronics industry – they find application in data components, brushless drives, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of creating threads in the magnet and complex shapes - recommended is casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these devices can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum holding power of the magnet – what it depends on?

The declared magnet strength refers to the maximum value, measured under optimal environment, meaning:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by working environment parameters, including (from most important):
  • Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Plate material – mild steel attracts best. Higher carbon content reduce magnetic properties and holding force.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
Avoid contact if allergic

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Safe distance

Equipment safety: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Threat to navigation

A strong magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to avoid damaging the sensors.

Bodily injuries

Protect your hands. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Demagnetization risk

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Do not underestimate power

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

Machining danger

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Keep away from children

These products are not suitable for play. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

ICD Warning

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Beware of splinters

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them shattering into small pieces.

Security! Details about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98