MPL 25x25x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020137
GTIN/EAN: 5906301811435
length
25 mm [±0,1 mm]
Width
25 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
46.88 g
Magnetization Direction
↑ axial
Load capacity
19.39 kg / 190.25 N
Magnetic Induction
361.04 mT / 3610 Gs
Coating
[NiCuNi] Nickel
20.29 ZŁ with VAT / pcs + price for transport
16.50 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical details - MPL 25x25x10 / N38 - lamellar magnet
Specification / characteristics - MPL 25x25x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020137 |
| GTIN/EAN | 5906301811435 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 25 mm [±0,1 mm] |
| Width | 25 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 46.88 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 19.39 kg / 190.25 N |
| Magnetic Induction ~ ? | 361.04 mT / 3610 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 |
Engineering modeling of the product - data
The following information represent the result of a physical simulation. Results were calculated on models for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs gap) - power drop
MPL 25x25x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3610 Gs
361.0 mT
|
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
|
dangerous! |
| 1 mm |
3392 Gs
339.2 mT
|
17.12 kg / 37.74 lbs
17117.7 g / 167.9 N
|
dangerous! |
| 2 mm |
3156 Gs
315.6 mT
|
14.82 kg / 32.68 lbs
14822.5 g / 145.4 N
|
dangerous! |
| 3 mm |
2913 Gs
291.3 mT
|
12.63 kg / 27.85 lbs
12631.8 g / 123.9 N
|
dangerous! |
| 5 mm |
2436 Gs
243.6 mT
|
8.83 kg / 19.46 lbs
8827.9 g / 86.6 N
|
strong |
| 10 mm |
1464 Gs
146.4 mT
|
3.19 kg / 7.04 lbs
3191.5 g / 31.3 N
|
strong |
| 15 mm |
872 Gs
87.2 mT
|
1.13 kg / 2.49 lbs
1131.5 g / 11.1 N
|
low risk |
| 20 mm |
538 Gs
53.8 mT
|
0.43 kg / 0.95 lbs
430.4 g / 4.2 N
|
low risk |
| 30 mm |
234 Gs
23.4 mT
|
0.08 kg / 0.18 lbs
81.8 g / 0.8 N
|
low risk |
| 50 mm |
68 Gs
6.8 mT
|
0.01 kg / 0.02 lbs
6.9 g / 0.1 N
|
low risk |
Table 2: Shear load (wall)
MPL 25x25x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.88 kg / 8.55 lbs
3878.0 g / 38.0 N
|
| 1 mm | Stal (~0.2) |
3.42 kg / 7.55 lbs
3424.0 g / 33.6 N
|
| 2 mm | Stal (~0.2) |
2.96 kg / 6.53 lbs
2964.0 g / 29.1 N
|
| 3 mm | Stal (~0.2) |
2.53 kg / 5.57 lbs
2526.0 g / 24.8 N
|
| 5 mm | Stal (~0.2) |
1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
|
| 10 mm | Stal (~0.2) |
0.64 kg / 1.41 lbs
638.0 g / 6.3 N
|
| 15 mm | Stal (~0.2) |
0.23 kg / 0.50 lbs
226.0 g / 2.2 N
|
| 20 mm | Stal (~0.2) |
0.09 kg / 0.19 lbs
86.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
16.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 25x25x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
5.82 kg / 12.82 lbs
5817.0 g / 57.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.88 kg / 8.55 lbs
3878.0 g / 38.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.94 kg / 4.27 lbs
1939.0 g / 19.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
9.70 kg / 21.37 lbs
9695.0 g / 95.1 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MPL 25x25x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.97 kg / 2.14 lbs
969.5 g / 9.5 N
|
| 1 mm |
|
2.42 kg / 5.34 lbs
2423.8 g / 23.8 N
|
| 2 mm |
|
4.85 kg / 10.69 lbs
4847.5 g / 47.6 N
|
| 3 mm |
|
7.27 kg / 16.03 lbs
7271.3 g / 71.3 N
|
| 5 mm |
|
12.12 kg / 26.72 lbs
12118.8 g / 118.9 N
|
| 10 mm |
|
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
|
| 11 mm |
|
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
|
| 12 mm |
|
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MPL 25x25x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
|
OK |
| 40 °C | -2.2% |
18.96 kg / 41.81 lbs
18963.4 g / 186.0 N
|
OK |
| 60 °C | -4.4% |
18.54 kg / 40.87 lbs
18536.8 g / 181.8 N
|
|
| 80 °C | -6.6% |
18.11 kg / 39.93 lbs
18110.3 g / 177.7 N
|
|
| 100 °C | -28.8% |
13.81 kg / 30.44 lbs
13805.7 g / 135.4 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 25x25x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
50.20 kg / 110.68 lbs
5 073 Gs
|
7.53 kg / 16.60 lbs
7531 g / 73.9 N
|
N/A |
| 1 mm |
47.31 kg / 104.30 lbs
7 008 Gs
|
7.10 kg / 15.65 lbs
7097 g / 69.6 N
|
42.58 kg / 93.87 lbs
~0 Gs
|
| 2 mm |
44.32 kg / 97.71 lbs
6 783 Gs
|
6.65 kg / 14.66 lbs
6648 g / 65.2 N
|
39.89 kg / 87.94 lbs
~0 Gs
|
| 3 mm |
41.33 kg / 91.12 lbs
6 550 Gs
|
6.20 kg / 13.67 lbs
6200 g / 60.8 N
|
37.20 kg / 82.01 lbs
~0 Gs
|
| 5 mm |
35.49 kg / 78.25 lbs
6 070 Gs
|
5.32 kg / 11.74 lbs
5324 g / 52.2 N
|
31.94 kg / 70.43 lbs
~0 Gs
|
| 10 mm |
22.86 kg / 50.39 lbs
4 871 Gs
|
3.43 kg / 7.56 lbs
3429 g / 33.6 N
|
20.57 kg / 45.35 lbs
~0 Gs
|
| 20 mm |
8.26 kg / 18.22 lbs
2 929 Gs
|
1.24 kg / 2.73 lbs
1240 g / 12.2 N
|
7.44 kg / 16.40 lbs
~0 Gs
|
| 50 mm |
0.46 kg / 1.02 lbs
695 Gs
|
0.07 kg / 0.15 lbs
70 g / 0.7 N
|
0.42 kg / 0.92 lbs
~0 Gs
|
| 60 mm |
0.21 kg / 0.47 lbs
469 Gs
|
0.03 kg / 0.07 lbs
32 g / 0.3 N
|
0.19 kg / 0.42 lbs
~0 Gs
|
| 70 mm |
0.10 kg / 0.23 lbs
329 Gs
|
0.02 kg / 0.03 lbs
16 g / 0.2 N
|
0.09 kg / 0.21 lbs
~0 Gs
|
| 80 mm |
0.05 kg / 0.12 lbs
239 Gs
|
0.01 kg / 0.02 lbs
8 g / 0.1 N
|
0.05 kg / 0.11 lbs
~0 Gs
|
| 90 mm |
0.03 kg / 0.07 lbs
178 Gs
|
0.00 kg / 0.01 lbs
5 g / 0.0 N
|
0.03 kg / 0.06 lbs
~0 Gs
|
| 100 mm |
0.02 kg / 0.04 lbs
136 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.04 lbs
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MPL 25x25x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 8.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MPL 25x25x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.52 km/h
(6.26 m/s)
|
0.92 J | |
| 30 mm |
35.62 km/h
(9.89 m/s)
|
2.29 J | |
| 50 mm |
45.87 km/h
(12.74 m/s)
|
3.81 J | |
| 100 mm |
64.86 km/h
(18.02 m/s)
|
7.61 J |
Table 9: Corrosion resistance
MPL 25x25x10 / 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: Construction data (Pc)
MPL 25x25x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 23 497 Mx | 235.0 µWb |
| Pc Coefficient | 0.46 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 25x25x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 19.39 kg | Standard |
| Water (riverbed) |
22.20 kg
(+2.81 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical wall, the magnet holds only ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Power loss vs temp
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46
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 as well as disadvantages of rare earth magnets.
Benefits
- They retain full power for almost ten years – the loss is just ~1% (based on simulations),
- They are resistant to demagnetization induced by external disturbances,
- Thanks to the metallic finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
- Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Possibility of custom forming and modifying to individual needs,
- Significant place in innovative solutions – they serve a role in computer drives, electromotive mechanisms, precision medical tools, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems
Limitations
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- Due to limitations in realizing threads and complex shapes in magnets, we recommend using casing - magnetic mount.
- Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
- Due to expensive raw materials, their price exceeds standard values,
Lifting parameters
Magnetic strength at its maximum – what affects it?
- with the use of a yoke made of special test steel, guaranteeing maximum field concentration
- with a thickness of at least 10 mm
- with a surface free of scratches
- with zero gap (no paint)
- under vertical force vector (90-degree angle)
- at ambient temperature approx. 20 degrees Celsius
Determinants of lifting force in real conditions
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Steel thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost into the air.
- Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and holding force.
- Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
- Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate decreases the holding force.
Precautions when working with neodymium magnets
Cards and drives
Avoid bringing magnets close to a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.
Power loss in heat
Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.
Adults only
Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.
Allergy Warning
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent direct skin contact or choose coated magnets.
Flammability
Powder produced during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Powerful field
Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Magnetic interference
A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Keep magnets near a smartphone to avoid damaging the sensors.
Protective goggles
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
Life threat
Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to work with the magnets.
Serious injuries
Risk of injury: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.
