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MPL 12.5x12.5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020117

GTIN/EAN: 5906301811237

5.00

length

12.5 mm [±0,1 mm]

Width

12.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

5.86 g

Magnetization Direction

↑ axial

Load capacity

4.84 kg / 47.51 N

Magnetic Induction

360.91 mT / 3609 Gs

Coating

[NiCuNi] Nickel

2.83 with VAT / pcs + price for transport

2.30 ZŁ net + 23% VAT / pcs

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Technical specification - MPL 12.5x12.5x5 / N38 - lamellar magnet

Specification / characteristics - MPL 12.5x12.5x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020117
GTIN/EAN 5906301811237
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 12.5 mm [±0,1 mm]
Width 12.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 5.86 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.84 kg / 47.51 N
Magnetic Induction ~ ? 360.91 mT / 3609 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 12.5x12.5x5 / N38 - lamellar magnet
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

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 modeling of the product - report

These data are the direct effect of a mathematical analysis. Values rely on models for the class Nd2Fe14B. Actual performance may differ. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - interaction chart
MPL 12.5x12.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3608 Gs
360.8 mT
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
medium risk
1 mm 3156 Gs
315.6 mT
3.70 kg / 8.17 LBS
3704.2 g / 36.3 N
medium risk
2 mm 2671 Gs
267.1 mT
2.65 kg / 5.85 LBS
2653.8 g / 26.0 N
medium risk
3 mm 2211 Gs
221.1 mT
1.82 kg / 4.01 LBS
1817.7 g / 17.8 N
low risk
5 mm 1464 Gs
146.4 mT
0.80 kg / 1.76 LBS
797.6 g / 7.8 N
low risk
10 mm 538 Gs
53.8 mT
0.11 kg / 0.24 LBS
107.6 g / 1.1 N
low risk
15 mm 234 Gs
23.4 mT
0.02 kg / 0.05 LBS
20.4 g / 0.2 N
low risk
20 mm 119 Gs
11.9 mT
0.01 kg / 0.01 LBS
5.3 g / 0.1 N
low risk
30 mm 42 Gs
4.2 mT
0.00 kg / 0.00 LBS
0.7 g / 0.0 N
low risk
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Vertical capacity (wall)
MPL 12.5x12.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.97 kg / 2.13 LBS
968.0 g / 9.5 N
1 mm Stal (~0.2) 0.74 kg / 1.63 LBS
740.0 g / 7.3 N
2 mm Stal (~0.2) 0.53 kg / 1.17 LBS
530.0 g / 5.2 N
3 mm Stal (~0.2) 0.36 kg / 0.80 LBS
364.0 g / 3.6 N
5 mm Stal (~0.2) 0.16 kg / 0.35 LBS
160.0 g / 1.6 N
10 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MPL 12.5x12.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.45 kg / 3.20 LBS
1452.0 g / 14.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.97 kg / 2.13 LBS
968.0 g / 9.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.48 kg / 1.07 LBS
484.0 g / 4.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.42 kg / 5.34 LBS
2420.0 g / 23.7 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 12.5x12.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.48 kg / 1.07 LBS
484.0 g / 4.7 N
1 mm
25%
1.21 kg / 2.67 LBS
1210.0 g / 11.9 N
2 mm
50%
2.42 kg / 5.34 LBS
2420.0 g / 23.7 N
3 mm
75%
3.63 kg / 8.00 LBS
3630.0 g / 35.6 N
5 mm
100%
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
10 mm
100%
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
11 mm
100%
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
12 mm
100%
4.84 kg / 10.67 LBS
4840.0 g / 47.5 N

Table 5: Thermal resistance (stability) - thermal limit
MPL 12.5x12.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.84 kg / 10.67 LBS
4840.0 g / 47.5 N
OK
40 °C -2.2% 4.73 kg / 10.44 LBS
4733.5 g / 46.4 N
OK
60 °C -4.4% 4.63 kg / 10.20 LBS
4627.0 g / 45.4 N
80 °C -6.6% 4.52 kg / 9.97 LBS
4520.6 g / 44.3 N
100 °C -28.8% 3.45 kg / 7.60 LBS
3446.1 g / 33.8 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 12.5x12.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.54 kg / 27.64 LBS
5 069 Gs
1.88 kg / 4.15 LBS
1880 g / 18.4 N
N/A
1 mm 11.08 kg / 24.43 LBS
6 783 Gs
1.66 kg / 3.66 LBS
1662 g / 16.3 N
9.97 kg / 21.98 LBS
~0 Gs
2 mm 9.59 kg / 21.15 LBS
6 312 Gs
1.44 kg / 3.17 LBS
1439 g / 14.1 N
8.63 kg / 19.04 LBS
~0 Gs
3 mm 8.18 kg / 18.03 LBS
5 827 Gs
1.23 kg / 2.70 LBS
1226 g / 12.0 N
7.36 kg / 16.22 LBS
~0 Gs
5 mm 5.71 kg / 12.60 LBS
4 871 Gs
0.86 kg / 1.89 LBS
857 g / 8.4 N
5.14 kg / 11.34 LBS
~0 Gs
10 mm 2.07 kg / 4.55 LBS
2 929 Gs
0.31 kg / 0.68 LBS
310 g / 3.0 N
1.86 kg / 4.10 LBS
~0 Gs
20 mm 0.28 kg / 0.61 LBS
1 076 Gs
0.04 kg / 0.09 LBS
42 g / 0.4 N
0.25 kg / 0.55 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
136 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
84 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
56 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
39 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
28 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
21 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Protective zones (electronics) - warnings
MPL 12.5x12.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (cracking risk) - collision effects
MPL 12.5x12.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.38 km/h
(8.16 m/s)
0.20 J
30 mm 50.21 km/h
(13.95 m/s)
0.57 J
50 mm 64.81 km/h
(18.00 m/s)
0.95 J
100 mm 91.65 km/h
(25.46 m/s)
1.90 J

Table 9: Coating parameters (durability)
MPL 12.5x12.5x5 / 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 12.5x12.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 874 Mx 58.7 µWb
Pc Coefficient 0.46 Low (Flat)

Table 11: Submerged application
MPL 12.5x12.5x5 / N38

Environment Effective steel pull Effect
Air (land) 4.84 kg Standard
Water (riverbed) 5.54 kg
(+0.70 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Power loss vs temp

*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.

Technical and environmental data
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%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020117-2026
Magnet Unit Converter
Pulling force

Magnetic Induction

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 12.5x12.5x5 mm and a weight of 5.86 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 4.84 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 12.5x12.5x5 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 12.5x12.5x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 12.5x12.5x5 / N38, it is best to use strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (12.5x12.5 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 12.5x12.5x5 mm, which, at a weight of 5.86 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 12.5x12.5x5 mm and a self-weight of 5.86 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their power is maintained, and after around ten years it decreases only by ~1% (theoretically),
  • Neodymium magnets are characterized by highly resistant to magnetic field loss caused by external interference,
  • Thanks to the reflective finish, the coating of nickel, gold, or silver-plated gives an aesthetic appearance,
  • Magnetic induction on the surface of the magnet is extremely intense,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of precise creating and adjusting to individual requirements,
  • Significant place in electronics industry – they are commonly used in mass storage devices, electromotive mechanisms, medical equipment, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited possibility of making nuts in the magnet and complicated shapes - recommended is a housing - magnet mounting.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat it depends on?

Holding force of 4.84 kg is a result of laboratory testing conducted under standard conditions:
  • with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by even structure
  • under conditions of no distance (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Holding efficiency impacted by specific conditions, mainly (from most important):
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, 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 surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Safe distance

Avoid bringing magnets near a purse, computer, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Shattering risk

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Dust is flammable

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Keep away from children

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.

Conscious usage

Handle with care. Neodymium magnets act from a long distance and snap with huge force, often faster than you can react.

Magnetic interference

Remember: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.

Bodily injuries

Big blocks can smash fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.

Do not overheat magnets

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Avoid contact if allergic

Certain individuals experience a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching might lead to a rash. We recommend use protective gloves.

Life threat

Individuals with a pacemaker have to maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.

Safety First! Details about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98