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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

bulk discounts:

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Product card - 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 simulation of the product - data

Presented data represent the outcome of a mathematical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Actual performance may differ. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
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 pounds
4840.0 g / 47.5 N
strong
1 mm 3156 Gs
315.6 mT
3.70 kg / 8.17 pounds
3704.2 g / 36.3 N
strong
2 mm 2671 Gs
267.1 mT
2.65 kg / 5.85 pounds
2653.8 g / 26.0 N
strong
3 mm 2211 Gs
221.1 mT
1.82 kg / 4.01 pounds
1817.7 g / 17.8 N
safe
5 mm 1464 Gs
146.4 mT
0.80 kg / 1.76 pounds
797.6 g / 7.8 N
safe
10 mm 538 Gs
53.8 mT
0.11 kg / 0.24 pounds
107.6 g / 1.1 N
safe
15 mm 234 Gs
23.4 mT
0.02 kg / 0.05 pounds
20.4 g / 0.2 N
safe
20 mm 119 Gs
11.9 mT
0.01 kg / 0.01 pounds
5.3 g / 0.1 N
safe
30 mm 42 Gs
4.2 mT
0.00 kg / 0.00 pounds
0.7 g / 0.0 N
safe
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Slippage 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 pounds
968.0 g / 9.5 N
1 mm Stal (~0.2) 0.74 kg / 1.63 pounds
740.0 g / 7.3 N
2 mm Stal (~0.2) 0.53 kg / 1.17 pounds
530.0 g / 5.2 N
3 mm Stal (~0.2) 0.36 kg / 0.80 pounds
364.0 g / 3.6 N
5 mm Stal (~0.2) 0.16 kg / 0.35 pounds
160.0 g / 1.6 N
10 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - 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 pounds
1452.0 g / 14.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.97 kg / 2.13 pounds
968.0 g / 9.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.48 kg / 1.07 pounds
484.0 g / 4.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.42 kg / 5.34 pounds
2420.0 g / 23.7 N

Table 4: Steel thickness (saturation) - 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 pounds
484.0 g / 4.7 N
1 mm
25%
1.21 kg / 2.67 pounds
1210.0 g / 11.9 N
2 mm
50%
2.42 kg / 5.34 pounds
2420.0 g / 23.7 N
3 mm
75%
3.63 kg / 8.00 pounds
3630.0 g / 35.6 N
5 mm
100%
4.84 kg / 10.67 pounds
4840.0 g / 47.5 N
10 mm
100%
4.84 kg / 10.67 pounds
4840.0 g / 47.5 N
11 mm
100%
4.84 kg / 10.67 pounds
4840.0 g / 47.5 N
12 mm
100%
4.84 kg / 10.67 pounds
4840.0 g / 47.5 N

Table 5: Working in heat (material behavior) - power drop
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 pounds
4840.0 g / 47.5 N
OK
40 °C -2.2% 4.73 kg / 10.44 pounds
4733.5 g / 46.4 N
OK
60 °C -4.4% 4.63 kg / 10.20 pounds
4627.0 g / 45.4 N
80 °C -6.6% 4.52 kg / 9.97 pounds
4520.6 g / 44.3 N
100 °C -28.8% 3.45 kg / 7.60 pounds
3446.1 g / 33.8 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 12.5x12.5x5 / N38

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

Table 7: Safety (HSE) (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
Remote 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: Collisions (cracking risk) - warning
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: Corrosion resistance
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: Construction 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: Underwater work (magnet fishing)
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Note: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Thermal stability

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46

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.

Technical specification and ecology
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
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
Quick Unit Converter
Pulling force

Magnetic Induction

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This product is an extremely strong 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.
They constitute a key element in the production of wind generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 12.5x12.5x5 / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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 high energy density. The key parameter here is the lifting capacity amounting to approximately 4.84 kg (force ~47.51 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
  • Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by external magnetic fields,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets are distinguished by very high magnetic induction on the outer layer,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Thanks to flexibility in forming and the capacity to customize to individual projects,
  • Versatile presence in future technologies – they are utilized in computer drives, electric drive systems, medical devices, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex shapes in magnets, we propose using a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, small components of these devices can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Information about lifting capacity was determined for ideal contact conditions, taking into account:
  • on a plate made of mild steel, optimally conducting the magnetic flux
  • with a cross-section of at least 10 mm
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

What influences lifting capacity in practice

Holding efficiency is influenced by working environment parameters, mainly (from priority):
  • Gap (between the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets
Beware of splinters

Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Danger to the youngest

NdFeB magnets are not toys. Swallowing a few magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and requires immediate surgery.

Compass and GPS

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a safe distance from your mobile, tablet, and GPS.

Serious injuries

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!

Medical implants

Warning for patients: Strong magnetic fields affect electronics. Keep at least 30 cm distance or request help to handle the magnets.

Warning for allergy sufferers

Some people experience a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching might lead to a rash. It is best to use safety gloves.

Respect the power

Before use, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Threat to electronics

Data protection: Neodymium magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Important! Details about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98