MPL 3x3x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020148
GTIN/EAN: 5906301811541
length
3 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.2 g
Magnetization Direction
↑ axial
Load capacity
0.34 kg / 3.37 N
Magnetic Induction
538.48 mT / 5385 Gs
Coating
[NiCuNi] Nickel
0.1845 ZŁ with VAT / pcs + price for transport
0.1500 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical data - MPL 3x3x3 / N38 - lamellar magnet
Specification / characteristics - MPL 3x3x3 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020148 |
| GTIN/EAN | 5906301811541 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 3 mm [±0,1 mm] |
| Width | 3 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 0.2 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.34 kg / 3.37 N |
| Magnetic Induction ~ ? | 538.48 mT / 5385 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 product - report
Presented data constitute the direct effect of a physical analysis. Results are based on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (pull vs distance) - characteristics
MPL 3x3x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5372 Gs
537.2 mT
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
weak grip |
| 1 mm |
2530 Gs
253.0 mT
|
0.08 kg / 0.17 pounds
75.4 g / 0.7 N
|
weak grip |
| 2 mm |
1127 Gs
112.7 mT
|
0.01 kg / 0.03 pounds
15.0 g / 0.1 N
|
weak grip |
| 3 mm |
562 Gs
56.2 mT
|
0.00 kg / 0.01 pounds
3.7 g / 0.0 N
|
weak grip |
| 5 mm |
192 Gs
19.2 mT
|
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
|
weak grip |
| 10 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 15 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage force (vertical surface)
MPL 3x3x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.07 kg / 0.15 pounds
68.0 g / 0.7 N
|
| 1 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
16.0 g / 0.2 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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 (shearing) - vertical pull
MPL 3x3x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.10 kg / 0.22 pounds
102.0 g / 1.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.07 kg / 0.15 pounds
68.0 g / 0.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.03 kg / 0.07 pounds
34.0 g / 0.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 3x3x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.03 kg / 0.07 pounds
34.0 g / 0.3 N
|
| 1 mm |
|
0.09 kg / 0.19 pounds
85.0 g / 0.8 N
|
| 2 mm |
|
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
|
| 3 mm |
|
0.26 kg / 0.56 pounds
255.0 g / 2.5 N
|
| 5 mm |
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
| 10 mm |
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
| 11 mm |
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
| 12 mm |
|
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
Table 5: Working in heat (material behavior) - power drop
MPL 3x3x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
|
OK |
| 40 °C | -2.2% |
0.33 kg / 0.73 pounds
332.5 g / 3.3 N
|
OK |
| 60 °C | -4.4% |
0.33 kg / 0.72 pounds
325.0 g / 3.2 N
|
OK |
| 80 °C | -6.6% |
0.32 kg / 0.70 pounds
317.6 g / 3.1 N
|
|
| 100 °C | -28.8% |
0.24 kg / 0.53 pounds
242.1 g / 2.4 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 3x3x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.60 kg / 3.53 pounds
5 931 Gs
|
0.24 kg / 0.53 pounds
240 g / 2.4 N
|
N/A |
| 1 mm |
0.80 kg / 1.77 pounds
7 610 Gs
|
0.12 kg / 0.27 pounds
120 g / 1.2 N
|
0.72 kg / 1.59 pounds
~0 Gs
|
| 2 mm |
0.36 kg / 0.78 pounds
5 061 Gs
|
0.05 kg / 0.12 pounds
53 g / 0.5 N
|
0.32 kg / 0.70 pounds
~0 Gs
|
| 3 mm |
0.15 kg / 0.34 pounds
3 343 Gs
|
0.02 kg / 0.05 pounds
23 g / 0.2 N
|
0.14 kg / 0.31 pounds
~0 Gs
|
| 5 mm |
0.03 kg / 0.08 pounds
1 568 Gs
|
0.01 kg / 0.01 pounds
5 g / 0.1 N
|
0.03 kg / 0.07 pounds
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 pounds
384 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
70 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 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
|
| 60 mm |
0.00 kg / 0.00 pounds
3 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
2 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
1 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
1 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
1 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 3x3x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 2.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 1.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.0 cm |
| Remote | 50 Gs (5.0 mT) | 1.0 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Collisions (kinetic energy) - collision effects
MPL 3x3x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
41.58 km/h
(11.55 m/s)
|
0.01 J | |
| 30 mm |
72.02 km/h
(20.01 m/s)
|
0.04 J | |
| 50 mm |
92.98 km/h
(25.83 m/s)
|
0.07 J | |
| 100 mm |
131.49 km/h
(36.53 m/s)
|
0.13 J |
Table 9: Surface protection spec
MPL 3x3x3 / 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 (Flux)
MPL 3x3x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 495 Mx | 5.0 µWb |
| Pc Coefficient | 0.84 | High (Stable) |
Table 11: Physics of underwater searching
MPL 3x3x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.34 kg | Standard |
| Water (riverbed) |
0.39 kg
(+0.05 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical wall, the magnet retains merely ~20% of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Heat tolerance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.84
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also products
Strengths and weaknesses of neodymium magnets.
Strengths
- They do not lose strength, even during approximately 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
- They maintain their magnetic properties even under external field action,
- In other words, due to the metallic surface of nickel, the element looks attractive,
- Magnets have impressive magnetic induction on the surface,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to freedom in designing and the ability to modify to individual projects,
- Key role in modern industrial fields – they are commonly used in mass storage devices, brushless drives, diagnostic systems, as well as technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Weaknesses
- At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
- Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Additionally, small elements of these products are able to complicate diagnosis medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what affects it?
- with the contact of a yoke made of special test steel, ensuring maximum field concentration
- with a thickness of at least 10 mm
- with an ground contact surface
- under conditions of no distance (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- at conditions approx. 20°C
Magnet lifting force in use – key factors
- Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
- Base massiveness – too thin plate causes magnetic saturation, causing part of the power to be wasted into the air.
- Plate material – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
- Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.
Safety rules for work with neodymium magnets
Life threat
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Data carriers
Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Phone sensors
Be aware: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, device, and navigation systems.
Serious injuries
Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Danger to the youngest
Neodymium magnets are not intended for children. Eating multiple magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.
Allergy Warning
Some people have a hypersensitivity to nickel, which is the common plating for neodymium magnets. Extended handling might lead to skin redness. We recommend wear protective gloves.
Operating temperature
Regular neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. This process is irreversible.
Dust is flammable
Drilling and cutting of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Safe operation
Handle with care. Rare earth magnets attract from a distance and snap with massive power, often faster than you can react.
Material brittleness
Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.
