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
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Physical properties - 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 |
Technical simulation of the assembly - report
Presented values are the outcome of a engineering analysis. Results were calculated on algorithms for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Treat these data as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - interaction chart
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
|
warning |
| 10 mm |
1464 Gs
146.4 mT
|
3.19 kg / 7.04 LBS
3191.5 g / 31.3 N
|
warning |
| 15 mm |
872 Gs
87.2 mT
|
1.13 kg / 2.49 LBS
1131.5 g / 11.1 N
|
weak grip |
| 20 mm |
538 Gs
53.8 mT
|
0.43 kg / 0.95 LBS
430.4 g / 4.2 N
|
weak grip |
| 30 mm |
234 Gs
23.4 mT
|
0.08 kg / 0.18 LBS
81.8 g / 0.8 N
|
weak grip |
| 50 mm |
68 Gs
6.8 mT
|
0.01 kg / 0.02 LBS
6.9 g / 0.1 N
|
weak grip |
Table 2: Vertical force (vertical surface)
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: Wall mounting (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 (substrate influence) - power losses
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 stability (stability) - 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 (attraction) - field range
MPL 25x25x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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: Safety (HSE) (implants) - warnings
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 8.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.5 cm |
| Remote | 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: Collisions (kinetic energy) - warning
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: Coating parameters (durability)
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. Wall mount (shear)
*Caution: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Temperature resistance
*For N38 grade, the critical 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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of neodymium magnets.
Strengths
- They retain full power for around ten years – the drop is just ~1% (based on simulations),
- Neodymium magnets remain highly resistant to magnetic field loss caused by external field sources,
- Thanks to the glossy finish, the coating of nickel, gold, or silver gives an modern appearance,
- They show high magnetic induction at the operating surface, which affects their effectiveness,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to freedom in constructing and the capacity to customize to specific needs,
- Huge importance in high-tech industry – they find application in data components, electromotive mechanisms, diagnostic systems, and complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited ability of creating nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
- Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these products can disrupt the diagnostic process medical when they are in the body.
- Due to expensive raw materials, their price is higher than average,
Pull force analysis
Highest magnetic holding force – what it depends on?
- using a base made of high-permeability steel, serving as a ideal flux conductor
- with a cross-section minimum 10 mm
- with an ground contact surface
- without the slightest clearance between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- at room temperature
Lifting capacity in practice – influencing factors
- Distance – the presence of foreign body (rust, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
- Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.
Warnings
Do not overheat magnets
Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.
Pacemakers
Individuals with a heart stimulator must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.
Compass and GPS
A strong magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.
Fragile material
Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
Electronic devices
Do not bring magnets near a purse, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.
Fire risk
Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
Allergic reactions
Some people experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in a rash. We suggest wear safety gloves.
Powerful field
Be careful. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can react.
Do not give to children
Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store away from children and animals.
Pinching danger
Risk of injury: The attraction force is so great that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.
