MPL 30x20x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020141
GTIN/EAN: 5906301811473
- length
- 30 mm [±0,1 mm]
- Width
- 20 mm [±0,1 mm]
- Height
- 10 mm [±0,1 mm]
- Weight
- 45 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
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Need more?Frequently asked questions
How much will a block magnet really hold?
What is the maximum working temperature?
What safety factor should I allow?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical - MPL 30x20x10 / N38 - lamellar magnet
Specification / characteristics - MPL 30x20x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020141 |
| GTIN/EAN | 5906301811473 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 30 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 45 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 19.53 kg / 191.55 N |
| Magnetic Induction ~ ? | 371.57 mT / 3716 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 simulation of the product - report
The following data are the result of a engineering analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ. Please consider these calculations as a reference point for designers.
Table 1: Static force (force vs distance) - characteristics
MPL 30x20x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3715 Gs
371.5 mT
|
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
|
dangerous! |
| 1 mm |
3464 Gs
346.4 mT
|
16.98 kg / 37.44 pounds
16983.1 g / 166.6 N
|
dangerous! |
| 2 mm |
3197 Gs
319.7 mT
|
14.47 kg / 31.89 pounds
14466.6 g / 141.9 N
|
dangerous! |
| 3 mm |
2927 Gs
292.7 mT
|
12.12 kg / 26.73 pounds
12123.3 g / 118.9 N
|
dangerous! |
| 5 mm |
2408 Gs
240.8 mT
|
8.21 kg / 18.10 pounds
8207.8 g / 80.5 N
|
strong |
| 10 mm |
1411 Gs
141.1 mT
|
2.82 kg / 6.21 pounds
2815.6 g / 27.6 N
|
strong |
| 15 mm |
832 Gs
83.2 mT
|
0.98 kg / 2.16 pounds
979.7 g / 9.6 N
|
low risk |
| 20 mm |
512 Gs
51.2 mT
|
0.37 kg / 0.82 pounds
371.2 g / 3.6 N
|
low risk |
| 30 mm |
224 Gs
22.4 mT
|
0.07 kg / 0.16 pounds
70.7 g / 0.7 N
|
low risk |
| 50 mm |
65 Gs
6.5 mT
|
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
low risk |
Table 2: Vertical capacity (vertical surface)
MPL 30x20x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.91 kg / 8.61 pounds
3906.0 g / 38.3 N
|
| 1 mm | Stal (~0.2) |
3.40 kg / 7.49 pounds
3396.0 g / 33.3 N
|
| 2 mm | Stal (~0.2) |
2.89 kg / 6.38 pounds
2894.0 g / 28.4 N
|
| 3 mm | Stal (~0.2) |
2.42 kg / 5.34 pounds
2424.0 g / 23.8 N
|
| 5 mm | Stal (~0.2) |
1.64 kg / 3.62 pounds
1642.0 g / 16.1 N
|
| 10 mm | Stal (~0.2) |
0.56 kg / 1.24 pounds
564.0 g / 5.5 N
|
| 15 mm | Stal (~0.2) |
0.20 kg / 0.43 pounds
196.0 g / 1.9 N
|
| 20 mm | Stal (~0.2) |
0.07 kg / 0.16 pounds
74.0 g / 0.7 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 g / 0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 30x20x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
5.86 kg / 12.92 pounds
5859.0 g / 57.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.91 kg / 8.61 pounds
3906.0 g / 38.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.95 kg / 4.31 pounds
1953.0 g / 19.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
9.77 kg / 21.53 pounds
9765.0 g / 95.8 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 30x20x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.98 kg / 2.15 pounds
976.5 g / 9.6 N
|
| 1 mm |
|
2.44 kg / 5.38 pounds
2441.3 g / 23.9 N
|
| 2 mm |
|
4.88 kg / 10.76 pounds
4882.5 g / 47.9 N
|
| 3 mm |
|
7.32 kg / 16.15 pounds
7323.8 g / 71.8 N
|
| 5 mm |
|
12.21 kg / 26.91 pounds
12206.3 g / 119.7 N
|
| 10 mm |
|
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
|
| 11 mm |
|
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
|
| 12 mm |
|
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
|
Table 5: Thermal stability (stability) - thermal limit
MPL 30x20x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
19.53 kg / 43.06 pounds
19530.0 g / 191.6 N
|
OK |
| 40 °C | -2.2% |
19.10 kg / 42.11 pounds
19100.3 g / 187.4 N
|
OK |
| 60 °C | -4.4% |
18.67 kg / 41.16 pounds
18670.7 g / 183.2 N
|
|
| 80 °C | -6.6% |
18.24 kg / 40.21 pounds
18241.0 g / 178.9 N
|
|
| 100 °C | -28.8% |
13.91 kg / 30.66 pounds
13905.4 g / 136.4 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 30x20x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
51.05 kg / 112.54 pounds
5 124 Gs
|
7.66 kg / 16.88 pounds
7657 g / 75.1 N
|
N/A |
| 1 mm |
47.76 kg / 105.28 pounds
7 186 Gs
|
7.16 kg / 15.79 pounds
7163 g / 70.3 N
|
42.98 kg / 94.76 pounds
~0 Gs
|
| 2 mm |
44.39 kg / 97.86 pounds
6 928 Gs
|
6.66 kg / 14.68 pounds
6658 g / 65.3 N
|
39.95 kg / 88.08 pounds
~0 Gs
|
| 3 mm |
41.06 kg / 90.52 pounds
6 663 Gs
|
6.16 kg / 13.58 pounds
6159 g / 60.4 N
|
36.95 kg / 81.47 pounds
~0 Gs
|
| 5 mm |
34.68 kg / 76.45 pounds
6 124 Gs
|
5.20 kg / 11.47 pounds
5202 g / 51.0 N
|
31.21 kg / 68.81 pounds
~0 Gs
|
| 10 mm |
21.45 kg / 47.30 pounds
4 817 Gs
|
3.22 kg / 7.09 pounds
3218 g / 31.6 N
|
19.31 kg / 42.57 pounds
~0 Gs
|
| 20 mm |
7.36 kg / 16.22 pounds
2 821 Gs
|
1.10 kg / 2.43 pounds
1104 g / 10.8 N
|
6.62 kg / 14.60 pounds
~0 Gs
|
| 50 mm |
0.40 kg / 0.89 pounds
662 Gs
|
0.06 kg / 0.13 pounds
61 g / 0.6 N
|
0.36 kg / 0.80 pounds
~0 Gs
|
| 60 mm |
0.18 kg / 0.41 pounds
447 Gs
|
0.03 kg / 0.06 pounds
28 g / 0.3 N
|
0.17 kg / 0.37 pounds
~0 Gs
|
| 70 mm |
0.09 kg / 0.20 pounds
314 Gs
|
0.01 kg / 0.03 pounds
14 g / 0.1 N
|
0.08 kg / 0.18 pounds
~0 Gs
|
| 80 mm |
0.05 kg / 0.11 pounds
228 Gs
|
0.01 kg / 0.02 pounds
7 g / 0.1 N
|
0.04 kg / 0.10 pounds
~0 Gs
|
| 90 mm |
0.03 kg / 0.06 pounds
170 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 100 mm |
0.02 kg / 0.03 pounds
130 Gs
|
0.00 kg / 0.01 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 30x20x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.0 cm |
| Mobile device | 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: Impact energy (cracking risk) - collision effects
MPL 30x20x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.90 km/h
(6.36 m/s)
|
0.91 J | |
| 30 mm |
24.51 km/h
(6.81 m/s)
|
1.04 J | |
| 50 mm |
24.56 km/h
(6.82 m/s)
|
1.05 J | |
| 100 mm |
24.57 km/h
(6.83 m/s)
|
1.05 J |
Table 9: Coating parameters (durability)
MPL 30x20x10 / 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 30x20x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 22 801 Mx | 228.0 µWb |
| Pc Coefficient | 0.46 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 30x20x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 19.53 kg | Standard |
| Water (riverbed) |
22.36 kg
(+2.83 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical surface, the magnet retains just ~20% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Temperature resistance
*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) = 0.46
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.
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 |
Other offers
Advantages and disadvantages of rare earth magnets.
Advantages
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- They are extremely resistant to demagnetization induced by presence of other magnetic fields,
- A magnet with a smooth silver surface has an effective appearance,
- Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
- 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...
- Thanks to freedom in designing and the capacity to customize to complex applications,
- Versatile presence in modern industrial fields – they serve a role in mass storage devices, electromotive mechanisms, diagnostic systems, also technologically advanced constructions.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise 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
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited ability of producing nuts in the magnet and complicated forms - preferred is cover - magnet mounting.
- Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Highest magnetic holding force – what contributes to it?
- on a plate made of structural steel, effectively closing the magnetic field
- with a thickness minimum 10 mm
- with a surface perfectly flat
- without any clearance between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- in temp. approx. 20°C
Determinants of practical lifting force of a magnet
- Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Material type – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
- Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.
Safe handling of NdFeB magnets
Metal Allergy
A percentage of the population have a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Extended handling can result in dermatitis. It is best to wear safety gloves.
Bone fractures
Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!
Keep away from electronics
Remember: neodymium magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your mobile, device, and GPS.
Do not underestimate power
Exercise caution. Rare earth magnets act from a long distance and connect with huge force, often faster than you can react.
Safe distance
Equipment safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).
Fragile material
Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Fire warning
Dust generated during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
Heat sensitivity
Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.
This is not a toy
NdFeB magnets are not toys. Accidental ingestion of multiple magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates urgent medical intervention.
Pacemakers
Patients with a ICD must maintain an safe separation from magnets. The magnetic field can stop the operation of the implant.
