MP 10x7/3.5x3 / N38 - ring magnet
ring magnet
Catalog no 030180
GTIN/EAN: 5906301811978
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 ZŁ 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 | values |
|---|---|
| Cat. no. | 030180 |
| GTIN/EAN | 5906301811978 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 |
|
0.19 kg / 0.41 pounds
188.0 g / 1.8 N
|
| 1 mm |
|
0.47 kg / 1.04 pounds
470.0 g / 4.6 N
|
| 2 mm |
|
0.94 kg / 2.07 pounds
940.0 g / 9.2 N
|
| 3 mm |
|
1.41 kg / 3.11 pounds
1410.0 g / 13.8 N
|
| 5 mm |
|
1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
|
| 10 mm |
|
1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
|
| 11 mm |
|
1.88 kg / 4.14 pounds
1880.0 g / 18.4 N
|
| 12 mm |
|
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% |
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.
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 |
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Advantages and disadvantages of Nd2Fe14B magnets.
Advantages
- 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
- 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?
- 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
- 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.
