MPL 30x15x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020389
GTIN/EAN: 5906301811886
length
30 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
33.75 g
Magnetization Direction
↑ axial
Load capacity
16.84 kg / 165.22 N
Magnetic Induction
413.45 mT / 4135 Gs
Coating
[NiCuNi] Nickel
24.48 ZŁ with VAT / pcs + price for transport
19.90 ZŁ net + 23% VAT / pcs
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Technical specification of the product - MPL 30x15x10 / N38 - lamellar magnet
Specification / characteristics - MPL 30x15x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020389 |
| GTIN/EAN | 5906301811886 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 30 mm [±0,1 mm] |
| Width | 15 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 33.75 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 16.84 kg / 165.22 N |
| Magnetic Induction ~ ? | 413.45 mT / 4135 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 analysis of the magnet - report
The following data represent the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these data as a reference point for designers.
Table 1: Static pull force (force vs gap) - power drop
MPL 30x15x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4133 Gs
413.3 mT
|
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
|
dangerous! |
| 1 mm |
3754 Gs
375.4 mT
|
13.89 kg / 30.62 lbs
13889.5 g / 136.3 N
|
dangerous! |
| 2 mm |
3365 Gs
336.5 mT
|
11.16 kg / 24.60 lbs
11159.2 g / 109.5 N
|
dangerous! |
| 3 mm |
2988 Gs
298.8 mT
|
8.80 kg / 19.41 lbs
8803.6 g / 86.4 N
|
warning |
| 5 mm |
2321 Gs
232.1 mT
|
5.31 kg / 11.71 lbs
5309.9 g / 52.1 N
|
warning |
| 10 mm |
1225 Gs
122.5 mT
|
1.48 kg / 3.26 lbs
1480.1 g / 14.5 N
|
low risk |
| 15 mm |
684 Gs
68.4 mT
|
0.46 kg / 1.02 lbs
461.6 g / 4.5 N
|
low risk |
| 20 mm |
409 Gs
40.9 mT
|
0.16 kg / 0.36 lbs
164.8 g / 1.6 N
|
low risk |
| 30 mm |
173 Gs
17.3 mT
|
0.03 kg / 0.07 lbs
29.6 g / 0.3 N
|
low risk |
| 50 mm |
50 Gs
5.0 mT
|
0.00 kg / 0.01 lbs
2.4 g / 0.0 N
|
low risk |
Table 2: Sliding hold (wall)
MPL 30x15x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.37 kg / 7.43 lbs
3368.0 g / 33.0 N
|
| 1 mm | Stal (~0.2) |
2.78 kg / 6.12 lbs
2778.0 g / 27.3 N
|
| 2 mm | Stal (~0.2) |
2.23 kg / 4.92 lbs
2232.0 g / 21.9 N
|
| 3 mm | Stal (~0.2) |
1.76 kg / 3.88 lbs
1760.0 g / 17.3 N
|
| 5 mm | Stal (~0.2) |
1.06 kg / 2.34 lbs
1062.0 g / 10.4 N
|
| 10 mm | Stal (~0.2) |
0.30 kg / 0.65 lbs
296.0 g / 2.9 N
|
| 15 mm | Stal (~0.2) |
0.09 kg / 0.20 lbs
92.0 g / 0.9 N
|
| 20 mm | Stal (~0.2) |
0.03 kg / 0.07 lbs
32.0 g / 0.3 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 30x15x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
5.05 kg / 11.14 lbs
5052.0 g / 49.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.37 kg / 7.43 lbs
3368.0 g / 33.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.68 kg / 3.71 lbs
1684.0 g / 16.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
8.42 kg / 18.56 lbs
8420.0 g / 82.6 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 30x15x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.84 kg / 1.86 lbs
842.0 g / 8.3 N
|
| 1 mm |
|
2.11 kg / 4.64 lbs
2105.0 g / 20.7 N
|
| 2 mm |
|
4.21 kg / 9.28 lbs
4210.0 g / 41.3 N
|
| 3 mm |
|
6.31 kg / 13.92 lbs
6315.0 g / 62.0 N
|
| 5 mm |
|
10.53 kg / 23.20 lbs
10525.0 g / 103.3 N
|
| 10 mm |
|
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
|
| 11 mm |
|
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
|
| 12 mm |
|
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
|
Table 5: Working in heat (stability) - power drop
MPL 30x15x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
16.84 kg / 37.13 lbs
16840.0 g / 165.2 N
|
OK |
| 40 °C | -2.2% |
16.47 kg / 36.31 lbs
16469.5 g / 161.6 N
|
OK |
| 60 °C | -4.4% |
16.10 kg / 35.49 lbs
16099.0 g / 157.9 N
|
|
| 80 °C | -6.6% |
15.73 kg / 34.68 lbs
15728.6 g / 154.3 N
|
|
| 100 °C | -28.8% |
11.99 kg / 26.43 lbs
11990.1 g / 117.6 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 30x15x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
47.39 kg / 104.48 lbs
5 357 Gs
|
7.11 kg / 15.67 lbs
7109 g / 69.7 N
|
N/A |
| 1 mm |
43.23 kg / 95.30 lbs
7 895 Gs
|
6.48 kg / 14.29 lbs
6484 g / 63.6 N
|
38.90 kg / 85.77 lbs
~0 Gs
|
| 2 mm |
39.09 kg / 86.17 lbs
7 507 Gs
|
5.86 kg / 12.93 lbs
5863 g / 57.5 N
|
35.18 kg / 77.56 lbs
~0 Gs
|
| 3 mm |
35.13 kg / 77.45 lbs
7 117 Gs
|
5.27 kg / 11.62 lbs
5270 g / 51.7 N
|
31.62 kg / 69.70 lbs
~0 Gs
|
| 5 mm |
27.95 kg / 61.61 lbs
6 348 Gs
|
4.19 kg / 9.24 lbs
4192 g / 41.1 N
|
25.15 kg / 55.45 lbs
~0 Gs
|
| 10 mm |
14.94 kg / 32.94 lbs
4 642 Gs
|
2.24 kg / 4.94 lbs
2242 g / 22.0 N
|
13.45 kg / 29.65 lbs
~0 Gs
|
| 20 mm |
4.17 kg / 9.18 lbs
2 451 Gs
|
0.62 kg / 1.38 lbs
625 g / 6.1 N
|
3.75 kg / 8.26 lbs
~0 Gs
|
| 50 mm |
0.19 kg / 0.41 lbs
519 Gs
|
0.03 kg / 0.06 lbs
28 g / 0.3 N
|
0.17 kg / 0.37 lbs
~0 Gs
|
| 60 mm |
0.08 kg / 0.18 lbs
347 Gs
|
0.01 kg / 0.03 lbs
13 g / 0.1 N
|
0.08 kg / 0.17 lbs
~0 Gs
|
| 70 mm |
0.04 kg / 0.09 lbs
242 Gs
|
0.01 kg / 0.01 lbs
6 g / 0.1 N
|
0.04 kg / 0.08 lbs
~0 Gs
|
| 80 mm |
0.02 kg / 0.05 lbs
175 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.04 lbs
~0 Gs
|
| 90 mm |
0.01 kg / 0.03 lbs
130 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.02 lbs
~0 Gs
|
| 100 mm |
0.01 kg / 0.02 lbs
99 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MPL 30x15x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 12.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 7.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 5.5 cm |
| Remote | 50 Gs (5.0 mT) | 5.0 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 (kinetic energy) - warning
MPL 30x15x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
23.73 km/h
(6.59 m/s)
|
0.73 J | |
| 30 mm |
39.06 km/h
(10.85 m/s)
|
1.99 J | |
| 50 mm |
50.38 km/h
(13.99 m/s)
|
3.30 J | |
| 100 mm |
71.24 km/h
(19.79 m/s)
|
6.61 J |
Table 9: Anti-corrosion coating durability
MPL 30x15x10 / 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 30x15x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 18 390 Mx | 183.9 µWb |
| Pc Coefficient | 0.52 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 30x15x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 16.84 kg | Standard |
| Water (riverbed) |
19.28 kg
(+2.44 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) significantly limits 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) = 0.52
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.
Chemical composition
| 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 proposals
Pros and cons of rare earth magnets.
Pros
- They do not lose power, even over around ten years – the decrease in power is only ~1% (based on measurements),
- Magnets very well defend themselves against demagnetization caused by external fields,
- The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Magnets are characterized by extremely high magnetic induction on the working surface,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of custom machining and adjusting to concrete conditions,
- Huge importance in modern technologies – they are commonly used in HDD drives, drive modules, medical devices, also technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Disadvantages
- 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
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited ability of producing threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- With mass production the cost of neodymium magnets is a challenge,
Lifting parameters
Highest magnetic holding force – what it depends on?
- with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- possessing a thickness of min. 10 mm to avoid saturation
- characterized by smoothness
- without any air gap between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- at ambient temperature room level
Impact of factors on magnetic holding capacity in practice
- Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Angle of force application – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
- Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.
Warnings
Operating temperature
Do not overheat. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).
Swallowing risk
Only for adults. Tiny parts can be swallowed, causing severe trauma. Keep away from children and animals.
Allergic reactions
Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease handling magnets and use protective gear.
Magnets are brittle
Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.
Danger to pacemakers
Individuals with a heart stimulator should keep an safe separation from magnets. The magnetism can stop the functioning of the implant.
Impact on smartphones
A powerful magnetic field interferes with the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a device to avoid damaging the sensors.
Hand protection
Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!
Powerful field
Exercise caution. Neodymium magnets attract from a long distance and connect with massive power, often faster than you can move away.
Protect data
Device Safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).
Machining danger
Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
