MPL 80x40x15 / N38 - lamellar magnet
lamellar magnet
Catalog no 020177
GTIN/EAN: 5906301811831
length
80 mm [±0,1 mm]
Width
40 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
360 g
Magnetization Direction
↑ axial
Load capacity
73.57 kg / 721.75 N
Magnetic Induction
285.78 mT / 2858 Gs
Coating
[NiCuNi] Nickel
139.54 ZŁ with VAT / pcs + price for transport
113.45 ZŁ net + 23% VAT / pcs
bulk discounts:
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Product card - MPL 80x40x15 / N38 - lamellar magnet
Specification / characteristics - MPL 80x40x15 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020177 |
| GTIN/EAN | 5906301811831 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 80 mm [±0,1 mm] |
| Width | 40 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 360 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 73.57 kg / 721.75 N |
| Magnetic Induction ~ ? | 285.78 mT / 2858 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 - technical parameters
The following data constitute the outcome of a physical analysis. Results are based on algorithms for the material Nd2Fe14B. Real-world conditions may differ. Use these data as a preliminary roadmap for designers.
Table 1: Static force (force vs gap) - power drop
MPL 80x40x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2857 Gs
285.7 mT
|
73.57 kg / 162.19 pounds
73570.0 g / 721.7 N
|
crushing |
| 1 mm |
2778 Gs
277.8 mT
|
69.55 kg / 153.32 pounds
69546.1 g / 682.2 N
|
crushing |
| 2 mm |
2693 Gs
269.3 mT
|
65.33 kg / 144.03 pounds
65331.2 g / 640.9 N
|
crushing |
| 3 mm |
2603 Gs
260.3 mT
|
61.05 kg / 134.59 pounds
61047.5 g / 598.9 N
|
crushing |
| 5 mm |
2415 Gs
241.5 mT
|
52.56 kg / 115.87 pounds
52559.7 g / 515.6 N
|
crushing |
| 10 mm |
1943 Gs
194.3 mT
|
34.02 kg / 75.00 pounds
34021.1 g / 333.7 N
|
crushing |
| 15 mm |
1527 Gs
152.7 mT
|
21.01 kg / 46.31 pounds
21007.7 g / 206.1 N
|
crushing |
| 20 mm |
1192 Gs
119.2 mT
|
12.81 kg / 28.24 pounds
12808.1 g / 125.6 N
|
crushing |
| 30 mm |
736 Gs
73.6 mT
|
4.89 kg / 10.77 pounds
4886.6 g / 47.9 N
|
strong |
| 50 mm |
313 Gs
31.3 mT
|
0.88 kg / 1.95 pounds
884.8 g / 8.7 N
|
weak grip |
Table 2: Sliding force (wall)
MPL 80x40x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
14.71 kg / 32.44 pounds
14714.0 g / 144.3 N
|
| 1 mm | Stal (~0.2) |
13.91 kg / 30.67 pounds
13910.0 g / 136.5 N
|
| 2 mm | Stal (~0.2) |
13.07 kg / 28.81 pounds
13066.0 g / 128.2 N
|
| 3 mm | Stal (~0.2) |
12.21 kg / 26.92 pounds
12210.0 g / 119.8 N
|
| 5 mm | Stal (~0.2) |
10.51 kg / 23.17 pounds
10512.0 g / 103.1 N
|
| 10 mm | Stal (~0.2) |
6.80 kg / 15.00 pounds
6804.0 g / 66.7 N
|
| 15 mm | Stal (~0.2) |
4.20 kg / 9.26 pounds
4202.0 g / 41.2 N
|
| 20 mm | Stal (~0.2) |
2.56 kg / 5.65 pounds
2562.0 g / 25.1 N
|
| 30 mm | Stal (~0.2) |
0.98 kg / 2.16 pounds
978.0 g / 9.6 N
|
| 50 mm | Stal (~0.2) |
0.18 kg / 0.39 pounds
176.0 g / 1.7 N
|
Table 3: Vertical assembly (sliding) - vertical pull
MPL 80x40x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
22.07 kg / 48.66 pounds
22071.0 g / 216.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
14.71 kg / 32.44 pounds
14714.0 g / 144.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
7.36 kg / 16.22 pounds
7357.0 g / 72.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
36.79 kg / 81.10 pounds
36785.0 g / 360.9 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 80x40x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.45 kg / 5.41 pounds
2452.3 g / 24.1 N
|
| 1 mm |
|
6.13 kg / 13.52 pounds
6130.8 g / 60.1 N
|
| 2 mm |
|
12.26 kg / 27.03 pounds
12261.7 g / 120.3 N
|
| 3 mm |
|
18.39 kg / 40.55 pounds
18392.5 g / 180.4 N
|
| 5 mm |
|
30.65 kg / 67.58 pounds
30654.2 g / 300.7 N
|
| 10 mm |
|
61.31 kg / 135.16 pounds
61308.3 g / 601.4 N
|
| 11 mm |
|
67.44 kg / 148.68 pounds
67439.2 g / 661.6 N
|
| 12 mm |
|
73.57 kg / 162.19 pounds
73570.0 g / 721.7 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MPL 80x40x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
73.57 kg / 162.19 pounds
73570.0 g / 721.7 N
|
OK |
| 40 °C | -2.2% |
71.95 kg / 158.63 pounds
71951.5 g / 705.8 N
|
OK |
| 60 °C | -4.4% |
70.33 kg / 155.06 pounds
70332.9 g / 690.0 N
|
|
| 80 °C | -6.6% |
68.71 kg / 151.49 pounds
68714.4 g / 674.1 N
|
|
| 100 °C | -28.8% |
52.38 kg / 115.48 pounds
52381.8 g / 513.9 N
|
Table 6: Two magnets (attraction) - forces in the system
MPL 80x40x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
161.08 kg / 355.13 pounds
4 384 Gs
|
24.16 kg / 53.27 pounds
24163 g / 237.0 N
|
N/A |
| 1 mm |
156.77 kg / 345.63 pounds
5 638 Gs
|
23.52 kg / 51.84 pounds
23516 g / 230.7 N
|
141.10 kg / 311.07 pounds
~0 Gs
|
| 2 mm |
152.27 kg / 335.70 pounds
5 556 Gs
|
22.84 kg / 50.36 pounds
22841 g / 224.1 N
|
137.05 kg / 302.13 pounds
~0 Gs
|
| 3 mm |
147.69 kg / 325.60 pounds
5 472 Gs
|
22.15 kg / 48.84 pounds
22153 g / 217.3 N
|
132.92 kg / 293.04 pounds
~0 Gs
|
| 5 mm |
138.36 kg / 305.04 pounds
5 297 Gs
|
20.75 kg / 45.76 pounds
20754 g / 203.6 N
|
124.53 kg / 274.53 pounds
~0 Gs
|
| 10 mm |
115.08 kg / 253.71 pounds
4 830 Gs
|
17.26 kg / 38.06 pounds
17262 g / 169.3 N
|
103.57 kg / 228.34 pounds
~0 Gs
|
| 20 mm |
74.49 kg / 164.22 pounds
3 886 Gs
|
11.17 kg / 24.63 pounds
11174 g / 109.6 N
|
67.04 kg / 147.80 pounds
~0 Gs
|
| 50 mm |
17.20 kg / 37.91 pounds
1 867 Gs
|
2.58 kg / 5.69 pounds
2580 g / 25.3 N
|
15.48 kg / 34.12 pounds
~0 Gs
|
| 60 mm |
10.70 kg / 23.59 pounds
1 473 Gs
|
1.60 kg / 3.54 pounds
1605 g / 15.7 N
|
9.63 kg / 21.23 pounds
~0 Gs
|
| 70 mm |
6.78 kg / 14.94 pounds
1 172 Gs
|
1.02 kg / 2.24 pounds
1017 g / 10.0 N
|
6.10 kg / 13.45 pounds
~0 Gs
|
| 80 mm |
4.38 kg / 9.65 pounds
942 Gs
|
0.66 kg / 1.45 pounds
657 g / 6.4 N
|
3.94 kg / 8.69 pounds
~0 Gs
|
| 90 mm |
2.89 kg / 6.36 pounds
765 Gs
|
0.43 kg / 0.95 pounds
433 g / 4.2 N
|
2.60 kg / 5.72 pounds
~0 Gs
|
| 100 mm |
1.94 kg / 4.27 pounds
627 Gs
|
0.29 kg / 0.64 pounds
291 g / 2.9 N
|
1.74 kg / 3.84 pounds
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MPL 80x40x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 26.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 20.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 16.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 12.5 cm |
| Remote | 50 Gs (5.0 mT) | 11.5 cm |
| Payment card | 400 Gs (40.0 mT) | 4.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.5 cm |
Table 8: Collisions (cracking risk) - warning
MPL 80x40x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
18.11 km/h
(5.03 m/s)
|
4.56 J | |
| 30 mm |
25.99 km/h
(7.22 m/s)
|
9.38 J | |
| 50 mm |
32.48 km/h
(9.02 m/s)
|
14.65 J | |
| 100 mm |
45.61 km/h
(12.67 m/s)
|
28.89 J |
Table 9: Corrosion resistance
MPL 80x40x15 / 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 80x40x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 94 833 Mx | 948.3 µWb |
| Pc Coefficient | 0.33 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 80x40x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 73.57 kg | Standard |
| Water (riverbed) |
84.24 kg
(+10.67 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.
3. Temperature resistance
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.33
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 |
Other deals
Strengths and weaknesses of rare earth magnets.
Advantages
- They have unchanged lifting capacity, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
- Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
- Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
- They are known for high magnetic induction at the operating surface, which affects their effectiveness,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to modularity in constructing and the ability to customize to complex applications,
- Wide application in innovative solutions – they are commonly used in magnetic memories, electromotive mechanisms, medical equipment, as well as other advanced devices.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Cons
- At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's 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.
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in creating nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
- Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Best holding force of the magnet in ideal parameters – what it depends on?
- using a base made of mild steel, functioning as a circuit closing element
- with a thickness of at least 10 mm
- characterized by smoothness
- under conditions of gap-free contact (metal-to-metal)
- during detachment in a direction perpendicular to the mounting surface
- at ambient temperature room level
Determinants of practical lifting force of a magnet
- Gap (betwixt the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
- Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Material type – the best choice is pure iron steel. Stainless steels may attract less.
- Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
- Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.
H&S for magnets
Nickel coating and allergies
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, immediately stop working with magnets and wear gloves.
Protective goggles
NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them shattering into shards.
Impact on smartphones
Remember: neodymium magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.
Immense force
Be careful. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.
Hand protection
Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.
Operating temperature
Regular neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. Damage is permanent.
Implant safety
People with a heart stimulator must keep an safe separation from magnets. The magnetic field can interfere with the operation of the life-saving device.
Dust explosion hazard
Powder created during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Keep away from children
Only for adults. Small elements pose a choking risk, leading to intestinal necrosis. Store away from children and animals.
Threat to electronics
Do not bring magnets close to a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.
