MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet
lamellar magnet
Catalog no 020397
GTIN/EAN: 5906301811909
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
15 g
Magnetization Direction
↑ axial
Load capacity
11.85 kg / 116.27 N
Magnetic Induction
321.37 mT / 3214 Gs
Coating
[NiCuNi] Nickel
9.93 ZŁ with VAT / pcs + price for transport
8.07 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet
Specification / characteristics - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020397 |
| GTIN/EAN | 5906301811909 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 15 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 11.85 kg / 116.27 N |
| Magnetic Induction ~ ? | 321.37 mT / 3214 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 assembly - technical parameters
These information are the result of a mathematical simulation. Values rely on models for the material Nd2Fe14B. Actual performance may differ from theoretical values. Please consider these data as a reference point when designing systems.
Table 1: Static force (force vs distance) - power drop
MPL 40x10x5x2[7/3.5] / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3212 Gs
321.2 mT
|
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
|
critical level |
| 1 mm |
2791 Gs
279.1 mT
|
8.95 kg / 19.73 lbs
8947.7 g / 87.8 N
|
medium risk |
| 2 mm |
2358 Gs
235.8 mT
|
6.38 kg / 14.08 lbs
6384.9 g / 62.6 N
|
medium risk |
| 3 mm |
1965 Gs
196.5 mT
|
4.43 kg / 9.77 lbs
4432.4 g / 43.5 N
|
medium risk |
| 5 mm |
1360 Gs
136.0 mT
|
2.12 kg / 4.68 lbs
2122.9 g / 20.8 N
|
medium risk |
| 10 mm |
615 Gs
61.5 mT
|
0.43 kg / 0.96 lbs
434.1 g / 4.3 N
|
weak grip |
| 15 mm |
329 Gs
32.9 mT
|
0.12 kg / 0.27 lbs
124.5 g / 1.2 N
|
weak grip |
| 20 mm |
195 Gs
19.5 mT
|
0.04 kg / 0.10 lbs
43.9 g / 0.4 N
|
weak grip |
| 30 mm |
83 Gs
8.3 mT
|
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
|
weak grip |
| 50 mm |
24 Gs
2.4 mT
|
0.00 kg / 0.00 lbs
0.6 g / 0.0 N
|
weak grip |
Table 2: Sliding load (vertical surface)
MPL 40x10x5x2[7/3.5] / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.37 kg / 5.22 lbs
2370.0 g / 23.2 N
|
| 1 mm | Stal (~0.2) |
1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
|
| 2 mm | Stal (~0.2) |
1.28 kg / 2.81 lbs
1276.0 g / 12.5 N
|
| 3 mm | Stal (~0.2) |
0.89 kg / 1.95 lbs
886.0 g / 8.7 N
|
| 5 mm | Stal (~0.2) |
0.42 kg / 0.93 lbs
424.0 g / 4.2 N
|
| 10 mm | Stal (~0.2) |
0.09 kg / 0.19 lbs
86.0 g / 0.8 N
|
| 15 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
24.0 g / 0.2 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - vertical pull
MPL 40x10x5x2[7/3.5] / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.55 kg / 7.84 lbs
3555.0 g / 34.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.37 kg / 5.22 lbs
2370.0 g / 23.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.19 kg / 2.61 lbs
1185.0 g / 11.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
5.93 kg / 13.06 lbs
5925.0 g / 58.1 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 40x10x5x2[7/3.5] / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.59 kg / 1.31 lbs
592.5 g / 5.8 N
|
| 1 mm |
|
1.48 kg / 3.27 lbs
1481.3 g / 14.5 N
|
| 2 mm |
|
2.96 kg / 6.53 lbs
2962.5 g / 29.1 N
|
| 3 mm |
|
4.44 kg / 9.80 lbs
4443.8 g / 43.6 N
|
| 5 mm |
|
7.41 kg / 16.33 lbs
7406.3 g / 72.7 N
|
| 10 mm |
|
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
|
| 11 mm |
|
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
|
| 12 mm |
|
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
|
Table 5: Working in heat (material behavior) - thermal limit
MPL 40x10x5x2[7/3.5] / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
11.85 kg / 26.12 lbs
11850.0 g / 116.2 N
|
OK |
| 40 °C | -2.2% |
11.59 kg / 25.55 lbs
11589.3 g / 113.7 N
|
OK |
| 60 °C | -4.4% |
11.33 kg / 24.98 lbs
11328.6 g / 111.1 N
|
|
| 80 °C | -6.6% |
11.07 kg / 24.40 lbs
11067.9 g / 108.6 N
|
|
| 100 °C | -28.8% |
8.44 kg / 18.60 lbs
8437.2 g / 82.8 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x10x5x2[7/3.5] / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
25.44 kg / 56.10 lbs
4 569 Gs
|
3.82 kg / 8.41 lbs
3817 g / 37.4 N
|
N/A |
| 1 mm |
22.33 kg / 49.22 lbs
6 018 Gs
|
3.35 kg / 7.38 lbs
3349 g / 32.9 N
|
20.09 kg / 44.30 lbs
~0 Gs
|
| 2 mm |
19.21 kg / 42.36 lbs
5 582 Gs
|
2.88 kg / 6.35 lbs
2882 g / 28.3 N
|
17.29 kg / 38.12 lbs
~0 Gs
|
| 3 mm |
16.31 kg / 35.96 lbs
5 144 Gs
|
2.45 kg / 5.39 lbs
2447 g / 24.0 N
|
14.68 kg / 32.36 lbs
~0 Gs
|
| 5 mm |
11.45 kg / 25.23 lbs
4 309 Gs
|
1.72 kg / 3.78 lbs
1717 g / 16.8 N
|
10.30 kg / 22.71 lbs
~0 Gs
|
| 10 mm |
4.56 kg / 10.05 lbs
2 719 Gs
|
0.68 kg / 1.51 lbs
684 g / 6.7 N
|
4.10 kg / 9.04 lbs
~0 Gs
|
| 20 mm |
0.93 kg / 2.05 lbs
1 230 Gs
|
0.14 kg / 0.31 lbs
140 g / 1.4 N
|
0.84 kg / 1.85 lbs
~0 Gs
|
| 50 mm |
0.04 kg / 0.08 lbs
249 Gs
|
0.01 kg / 0.01 lbs
6 g / 0.1 N
|
0.03 kg / 0.08 lbs
~0 Gs
|
| 60 mm |
0.02 kg / 0.04 lbs
167 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.03 lbs
~0 Gs
|
| 70 mm |
0.01 kg / 0.02 lbs
116 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.01 lbs
84 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.01 lbs
62 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
48 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MPL 40x10x5x2[7/3.5] / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 9.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 7.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 5.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.5 cm |
| Car key | 50 Gs (5.0 mT) | 4.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (cracking risk) - collision effects
MPL 40x10x5x2[7/3.5] / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
28.99 km/h
(8.05 m/s)
|
0.49 J | |
| 30 mm |
49.12 km/h
(13.64 m/s)
|
1.40 J | |
| 50 mm |
63.39 km/h
(17.61 m/s)
|
2.33 J | |
| 100 mm |
89.64 km/h
(24.90 m/s)
|
4.65 J |
Table 9: Anti-corrosion coating durability
MPL 40x10x5x2[7/3.5] / 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 (Pc)
MPL 40x10x5x2[7/3.5] / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 11 419 Mx | 114.2 µWb |
| Pc Coefficient | 0.31 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 40x10x5x2[7/3.5] / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 11.85 kg | Standard |
| Water (riverbed) |
13.57 kg
(+1.72 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Thermal stability
*For N38 grade, the critical 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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Strengths as well as weaknesses of rare earth magnets.
Benefits
- They retain magnetic properties for almost 10 years – the drop is just ~1% (based on simulations),
- Neodymium magnets remain extremely resistant to magnetic field loss caused by external interference,
- By applying a shiny layer of nickel, the element presents an aesthetic look,
- Neodymium magnets achieve maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
- Thanks to flexibility in forming and the ability to adapt to client solutions,
- Versatile presence in high-tech industry – they find application in hard drives, brushless drives, diagnostic systems, as well as industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in small systems
Cons
- At very 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.
- Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these products can disrupt the diagnostic process medical after entering the body.
- With mass production the cost of neodymium magnets is a challenge,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- using a base made of low-carbon steel, functioning as a ideal flux conductor
- whose transverse dimension equals approx. 10 mm
- characterized by smoothness
- with total lack of distance (no coatings)
- for force applied at a right angle (pull-off, not shear)
- in stable room temperature
Determinants of lifting force in real conditions
- Clearance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
- Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
- Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.
Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.
Precautions when working with NdFeB magnets
Handling guide
Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often faster than you can move away.
Keep away from children
Adult use only. Small elements can be swallowed, leading to serious injuries. Store away from kids and pets.
Electronic devices
Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.
Serious injuries
Danger of trauma: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.
Machining danger
Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Operating temperature
Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.
Metal Allergy
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.
GPS and phone interference
A powerful magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Keep magnets near a smartphone to prevent damaging the sensors.
Risk of cracking
Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.
ICD Warning
For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to work with the magnets.
