MPL 40x15x6 / N38 - lamellar magnet
lamellar magnet
Catalog no 020155
GTIN/EAN: 5906301811619
- length
- 40 mm [±0,1 mm]
- Width
- 15 mm [±0,1 mm]
- Height
- 6 mm [±0,1 mm]
- Weight
- 27 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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Detailed specification - MPL 40x15x6 / N38 - lamellar magnet
Specification / characteristics - MPL 40x15x6 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020155 |
| GTIN/EAN | 5906301811619 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 15 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 27 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 14.21 kg / 139.45 N |
| Magnetic Induction ~ ? | 286.36 mT / 2864 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 | 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 analysis of the magnet - data
The following data constitute the outcome of a mathematical calculation. Results are based on models for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
MPL 40x15x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2863 Gs
286.3 mT
|
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
|
crushing |
| 1 mm |
2635 Gs
263.5 mT
|
12.04 kg / 26.55 lbs
12041.8 g / 118.1 N
|
crushing |
| 2 mm |
2385 Gs
238.5 mT
|
9.86 kg / 21.74 lbs
9859.1 g / 96.7 N
|
warning |
| 3 mm |
2132 Gs
213.2 mT
|
7.88 kg / 17.37 lbs
7880.1 g / 77.3 N
|
warning |
| 5 mm |
1670 Gs
167.0 mT
|
4.84 kg / 10.66 lbs
4837.1 g / 47.5 N
|
warning |
| 10 mm |
903 Gs
90.3 mT
|
1.41 kg / 3.11 lbs
1412.2 g / 13.9 N
|
weak grip |
| 15 mm |
520 Gs
52.0 mT
|
0.47 kg / 1.03 lbs
469.2 g / 4.6 N
|
weak grip |
| 20 mm |
320 Gs
32.0 mT
|
0.18 kg / 0.39 lbs
177.7 g / 1.7 N
|
weak grip |
| 30 mm |
141 Gs
14.1 mT
|
0.03 kg / 0.08 lbs
34.5 g / 0.3 N
|
weak grip |
| 50 mm |
41 Gs
4.1 mT
|
0.00 kg / 0.01 lbs
3.0 g / 0.0 N
|
weak grip |
Table 2: Sliding hold (vertical surface)
MPL 40x15x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
|
| 1 mm | Stal (~0.2) |
2.41 kg / 5.31 lbs
2408.0 g / 23.6 N
|
| 2 mm | Stal (~0.2) |
1.97 kg / 4.35 lbs
1972.0 g / 19.3 N
|
| 3 mm | Stal (~0.2) |
1.58 kg / 3.47 lbs
1576.0 g / 15.5 N
|
| 5 mm | Stal (~0.2) |
0.97 kg / 2.13 lbs
968.0 g / 9.5 N
|
| 10 mm | Stal (~0.2) |
0.28 kg / 0.62 lbs
282.0 g / 2.8 N
|
| 15 mm | Stal (~0.2) |
0.09 kg / 0.21 lbs
94.0 g / 0.9 N
|
| 20 mm | Stal (~0.2) |
0.04 kg / 0.08 lbs
36.0 g / 0.4 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 (shearing) - behavior on slippery surfaces
MPL 40x15x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
4.26 kg / 9.40 lbs
4263.0 g / 41.8 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.84 kg / 6.27 lbs
2842.0 g / 27.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.42 kg / 3.13 lbs
1421.0 g / 13.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
7.11 kg / 15.66 lbs
7105.0 g / 69.7 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MPL 40x15x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.71 kg / 1.57 lbs
710.5 g / 7.0 N
|
| 1 mm |
|
1.78 kg / 3.92 lbs
1776.3 g / 17.4 N
|
| 2 mm |
|
3.55 kg / 7.83 lbs
3552.5 g / 34.9 N
|
| 3 mm |
|
5.33 kg / 11.75 lbs
5328.8 g / 52.3 N
|
| 5 mm |
|
8.88 kg / 19.58 lbs
8881.3 g / 87.1 N
|
| 10 mm |
|
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
|
| 11 mm |
|
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
|
| 12 mm |
|
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
|
Table 5: Working in heat (material behavior) - thermal limit
MPL 40x15x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
14.21 kg / 31.33 lbs
14210.0 g / 139.4 N
|
OK |
| 40 °C | -2.2% |
13.90 kg / 30.64 lbs
13897.4 g / 136.3 N
|
OK |
| 60 °C | -4.4% |
13.58 kg / 29.95 lbs
13584.8 g / 133.3 N
|
|
| 80 °C | -6.6% |
13.27 kg / 29.26 lbs
13272.1 g / 130.2 N
|
|
| 100 °C | -28.8% |
10.12 kg / 22.31 lbs
10117.5 g / 99.3 N
|
Table 6: Two magnets (repulsion) - field range
MPL 40x15x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
30.32 kg / 66.84 lbs
4 334 Gs
|
4.55 kg / 10.03 lbs
4547 g / 44.6 N
|
N/A |
| 1 mm |
28.06 kg / 61.86 lbs
5 508 Gs
|
4.21 kg / 9.28 lbs
4209 g / 41.3 N
|
25.25 kg / 55.67 lbs
~0 Gs
|
| 2 mm |
25.69 kg / 56.64 lbs
5 271 Gs
|
3.85 kg / 8.50 lbs
3854 g / 37.8 N
|
23.12 kg / 50.97 lbs
~0 Gs
|
| 3 mm |
23.33 kg / 51.43 lbs
5 023 Gs
|
3.50 kg / 7.71 lbs
3499 g / 34.3 N
|
21.00 kg / 46.29 lbs
~0 Gs
|
| 5 mm |
18.85 kg / 41.56 lbs
4 515 Gs
|
2.83 kg / 6.23 lbs
2828 g / 27.7 N
|
16.97 kg / 37.40 lbs
~0 Gs
|
| 10 mm |
10.32 kg / 22.75 lbs
3 341 Gs
|
1.55 kg / 3.41 lbs
1548 g / 15.2 N
|
9.29 kg / 20.48 lbs
~0 Gs
|
| 20 mm |
3.01 kg / 6.64 lbs
1 805 Gs
|
0.45 kg / 1.00 lbs
452 g / 4.4 N
|
2.71 kg / 5.98 lbs
~0 Gs
|
| 50 mm |
0.16 kg / 0.35 lbs
416 Gs
|
0.02 kg / 0.05 lbs
24 g / 0.2 N
|
0.14 kg / 0.32 lbs
~0 Gs
|
| 60 mm |
0.07 kg / 0.16 lbs
282 Gs
|
0.01 kg / 0.02 lbs
11 g / 0.1 N
|
0.07 kg / 0.15 lbs
~0 Gs
|
| 70 mm |
0.04 kg / 0.08 lbs
199 Gs
|
0.01 kg / 0.01 lbs
5 g / 0.1 N
|
0.03 kg / 0.07 lbs
~0 Gs
|
| 80 mm |
0.02 kg / 0.04 lbs
144 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 / 0.02 lbs
108 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 / 0.01 lbs
83 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - warnings
MPL 40x15x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 8.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 7.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 5.5 cm |
| Car key | 50 Gs (5.0 mT) | 5.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Dynamics (kinetic energy) - warning
MPL 40x15x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
23.64 km/h
(6.57 m/s)
|
0.58 J | |
| 30 mm |
24.91 km/h
(6.92 m/s)
|
0.65 J | |
| 50 mm |
24.95 km/h
(6.93 m/s)
|
0.65 J | |
| 100 mm |
24.96 km/h
(6.93 m/s)
|
0.65 J |
Table 9: Anti-corrosion coating durability
MPL 40x15x6 / 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 40x15x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 16 905 Mx | 169.0 µWb |
| Pc Coefficient | 0.31 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 40x15x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 14.21 kg | Standard |
| Water (riverbed) |
16.27 kg
(+2.06 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Thermal stability
*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) = 0.31
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% |
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 and cons of Nd2Fe14B magnets.
Benefits
- They retain attractive force for nearly 10 years – the drop is just ~1% (based on simulations),
- They do not lose their magnetic properties even under external field action,
- By covering with a lustrous layer of gold, the element presents an professional look,
- Magnetic induction on the working part of the magnet is impressive,
- 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...
- Possibility of accurate forming as well as adjusting to individual applications,
- Huge importance in modern industrial fields – they are commonly used in HDD drives, electric drive systems, advanced medical instruments, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of creating threads in the magnet and complex shapes - preferred is casing - mounting mechanism.
- Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
- Due to expensive raw materials, their price is higher than average,
Lifting parameters
Maximum magnetic pulling force – what contributes to it?
- with the contact of a yoke made of special test steel, ensuring full magnetic saturation
- possessing a thickness of at least 10 mm to ensure full flux closure
- with an ideally smooth contact surface
- under conditions of ideal adhesion (metal-to-metal)
- for force acting at a right angle (pull-off, not shear)
- at conditions approx. 20°C
Key elements affecting lifting force
- Air gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or debris).
- Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
- Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
- Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.
Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.
Warnings
Conscious usage
Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Keep away from electronics
Be aware: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, device, and navigation systems.
Do not overheat magnets
Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Health Danger
For implant holders: Powerful magnets affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Magnet fragility
Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Keep away from computers
Equipment safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).
Nickel allergy
A percentage of the population have a contact allergy to Ni, which is the typical protective layer for neodymium magnets. Frequent touching can result in skin redness. We recommend use safety gloves.
Pinching danger
Danger of trauma: The attraction force is so immense that it can cause hematomas, pinching, and broken bones. Use thick gloves.
Fire warning
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
Do not give to children
Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are fatal.
