MPL 25x10x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020135
GTIN/EAN: 5906301811411
length
25 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
9.38 g
Magnetization Direction
↑ axial
Load capacity
7.49 kg / 73.45 N
Magnetic Induction
337.05 mT / 3371 Gs
Coating
[NiCuNi] Nickel
4.66 ZŁ with VAT / pcs + price for transport
3.79 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical data of the product - MPL 25x10x5 / N38 - lamellar magnet
Specification / characteristics - MPL 25x10x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020135 |
| GTIN/EAN | 5906301811411 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 25 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 9.38 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 7.49 kg / 73.45 N |
| Magnetic Induction ~ ? | 337.05 mT / 3371 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 analysis of the product - report
These information represent the direct effect of a physical analysis. Values rely on models for the material Nd2Fe14B. Operational performance may differ from theoretical values. Treat these data as a reference point for designers.
Table 1: Static pull force (force vs gap) - interaction chart
MPL 25x10x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3369 Gs
336.9 mT
|
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
|
strong |
| 1 mm |
2932 Gs
293.2 mT
|
5.67 kg / 12.51 LBS
5673.2 g / 55.7 N
|
strong |
| 2 mm |
2479 Gs
247.9 mT
|
4.06 kg / 8.94 LBS
4056.9 g / 39.8 N
|
strong |
| 3 mm |
2065 Gs
206.5 mT
|
2.81 kg / 6.21 LBS
2814.7 g / 27.6 N
|
strong |
| 5 mm |
1419 Gs
141.9 mT
|
1.33 kg / 2.93 LBS
1328.6 g / 13.0 N
|
safe |
| 10 mm |
603 Gs
60.3 mT
|
0.24 kg / 0.53 LBS
240.3 g / 2.4 N
|
safe |
| 15 mm |
296 Gs
29.6 mT
|
0.06 kg / 0.13 LBS
57.8 g / 0.6 N
|
safe |
| 20 mm |
162 Gs
16.2 mT
|
0.02 kg / 0.04 LBS
17.4 g / 0.2 N
|
safe |
| 30 mm |
62 Gs
6.2 mT
|
0.00 kg / 0.01 LBS
2.5 g / 0.0 N
|
safe |
| 50 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
safe |
Table 2: Slippage force (vertical surface)
MPL 25x10x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.50 kg / 3.30 LBS
1498.0 g / 14.7 N
|
| 1 mm | Stal (~0.2) |
1.13 kg / 2.50 LBS
1134.0 g / 11.1 N
|
| 2 mm | Stal (~0.2) |
0.81 kg / 1.79 LBS
812.0 g / 8.0 N
|
| 3 mm | Stal (~0.2) |
0.56 kg / 1.24 LBS
562.0 g / 5.5 N
|
| 5 mm | Stal (~0.2) |
0.27 kg / 0.59 LBS
266.0 g / 2.6 N
|
| 10 mm | Stal (~0.2) |
0.05 kg / 0.11 LBS
48.0 g / 0.5 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
12.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MPL 25x10x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.25 kg / 4.95 LBS
2247.0 g / 22.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.50 kg / 3.30 LBS
1498.0 g / 14.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.75 kg / 1.65 LBS
749.0 g / 7.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.75 kg / 8.26 LBS
3745.0 g / 36.7 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MPL 25x10x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.75 kg / 1.65 LBS
749.0 g / 7.3 N
|
| 1 mm |
|
1.87 kg / 4.13 LBS
1872.5 g / 18.4 N
|
| 2 mm |
|
3.75 kg / 8.26 LBS
3745.0 g / 36.7 N
|
| 3 mm |
|
5.62 kg / 12.38 LBS
5617.5 g / 55.1 N
|
| 5 mm |
|
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
|
| 10 mm |
|
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
|
| 11 mm |
|
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
|
| 12 mm |
|
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
|
Table 5: Working in heat (stability) - power drop
MPL 25x10x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
|
OK |
| 40 °C | -2.2% |
7.33 kg / 16.15 LBS
7325.2 g / 71.9 N
|
OK |
| 60 °C | -4.4% |
7.16 kg / 15.79 LBS
7160.4 g / 70.2 N
|
|
| 80 °C | -6.6% |
7.00 kg / 15.42 LBS
6995.7 g / 68.6 N
|
|
| 100 °C | -28.8% |
5.33 kg / 11.76 LBS
5332.9 g / 52.3 N
|
Table 6: Two magnets (repulsion) - field range
MPL 25x10x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
17.49 kg / 38.57 LBS
4 785 Gs
|
2.62 kg / 5.78 LBS
2624 g / 25.7 N
|
N/A |
| 1 mm |
15.37 kg / 33.89 LBS
6 316 Gs
|
2.31 kg / 5.08 LBS
2306 g / 22.6 N
|
13.84 kg / 30.50 LBS
~0 Gs
|
| 2 mm |
13.25 kg / 29.21 LBS
5 864 Gs
|
1.99 kg / 4.38 LBS
1987 g / 19.5 N
|
11.92 kg / 26.29 LBS
~0 Gs
|
| 3 mm |
11.26 kg / 24.83 LBS
5 407 Gs
|
1.69 kg / 3.72 LBS
1690 g / 16.6 N
|
10.14 kg / 22.35 LBS
~0 Gs
|
| 5 mm |
7.91 kg / 17.44 LBS
4 531 Gs
|
1.19 kg / 2.62 LBS
1187 g / 11.6 N
|
7.12 kg / 15.70 LBS
~0 Gs
|
| 10 mm |
3.10 kg / 6.84 LBS
2 838 Gs
|
0.47 kg / 1.03 LBS
465 g / 4.6 N
|
2.79 kg / 6.16 LBS
~0 Gs
|
| 20 mm |
0.56 kg / 1.24 LBS
1 207 Gs
|
0.08 kg / 0.19 LBS
84 g / 0.8 N
|
0.51 kg / 1.11 LBS
~0 Gs
|
| 50 mm |
0.01 kg / 0.03 LBS
194 Gs
|
0.00 kg / 0.00 LBS
2 g / 0.0 N
|
0.01 kg / 0.03 LBS
~0 Gs
|
| 60 mm |
0.01 kg / 0.01 LBS
124 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.01 LBS
84 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 LBS
59 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 LBS
43 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 LBS
32 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MPL 25x10x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 5.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 4.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (kinetic energy) - warning
MPL 25x10x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
29.06 km/h
(8.07 m/s)
|
0.31 J | |
| 30 mm |
49.37 km/h
(13.71 m/s)
|
0.88 J | |
| 50 mm |
63.73 km/h
(17.70 m/s)
|
1.47 J | |
| 100 mm |
90.12 km/h
(25.03 m/s)
|
2.94 J |
Table 9: Corrosion resistance
MPL 25x10x5 / 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 (Flux)
MPL 25x10x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 8 245 Mx | 82.5 µWb |
| Pc Coefficient | 0.38 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 25x10x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 7.49 kg | Standard |
| Water (riverbed) |
8.58 kg
(+1.09 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical surface, the magnet holds just a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) significantly limits the holding force.
3. Heat tolerance
*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) = 0.38
This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Advantages and disadvantages of Nd2Fe14B magnets.
Benefits
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
- They are extremely resistant to demagnetization induced by external magnetic fields,
- Thanks to the elegant finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an professional appearance,
- Magnets have excellent magnetic induction on the outer layer,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
- Thanks to versatility in forming and the capacity to modify to specific needs,
- Universal use in modern industrial fields – they serve a role in mass storage devices, electromotive mechanisms, diagnostic systems, as well as technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets suffer a drop in strength. 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 resistant to moisture, in case of application outdoors
- We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
- Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets are able to disrupt the diagnostic process medical after entering the body.
- Due to complex production process, their price exceeds standard values,
Lifting parameters
Maximum lifting force for a neodymium magnet – what affects it?
- using a sheet made of low-carbon steel, functioning as a circuit closing element
- possessing a massiveness of minimum 10 mm to avoid saturation
- with an ideally smooth contact surface
- without any clearance between the magnet and steel
- under vertical force vector (90-degree angle)
- at temperature approx. 20 degrees Celsius
Determinants of practical lifting force of a magnet
- Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
- Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
- Thermal environment – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.
Warnings
Shattering risk
Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Nickel allergy
Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease working with magnets and use protective gear.
Implant safety
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Data carriers
Do not bring magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and erase data from cards.
Magnetic interference
Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Bodily injuries
Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Use thick gloves.
Machining danger
Powder produced during cutting of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.
Power loss in heat
Control the heat. Exposing the magnet to high heat will ruin its properties and strength.
Respect the power
Handle magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and do not underestimate their force.
Keep away from children
Always keep magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are very dangerous.
