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MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020397

GTIN/EAN: 5906301811909

5.00

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

product parameters »

9.93 ZŁ with VAT / pcs + price for transport

8.07 ZŁ net + 23% VAT / pcs

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Give us a call +48 22 499 98 98 alternatively get in touch through form through our site.
Weight as well as form of neodymium magnets can be reviewed using our online calculation tool.

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Technical details - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020397
GTIN/EAN 5906301811909
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 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

Specification / characteristics MPL 40x10x5x2[7/3.5] / 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 magnet - report

Presented values constitute the outcome of a engineering calculation. Values were calculated on models for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
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
 crushing
1 mm 2791 Gs
279.1 mT
 8.95 kg / 19.73 LBS
8947.7 g / 87.8 N
 warning
2 mm 2358 Gs
235.8 mT
 6.38 kg / 14.08 LBS
6384.9 g / 62.6 N
 warning
3 mm 1965 Gs
196.5 mT
 4.43 kg / 9.77 LBS
4432.4 g / 43.5 N
 warning
5 mm 1360 Gs
136.0 mT
 2.12 kg / 4.68 LBS
2122.9 g / 20.8 N
 warning
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
Pulling power weakens sharply with every mm of spacing. Note that even a very thin break (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Magnets hold most effectively at the point of direct contact; air break nullifies the force. Notice how quickly the pull force drop, when the magnet does not touch directly to the metal substrate. When calculating the assembly, avoid unnecessary gaps.

Table 2: Vertical capacity (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
The following data presents the theoretical force required to initiate the shifting of the magnet vertically against a vertical metal surface (assuming typical friction). This parameter depends on the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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
When placing a magnet on a vertical surface (e.g., a board), it you can count on only approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient cause that holders slip easier than they pop off the substrate. Designing a vertical fastening? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will slip down under a noticeably lighter weight. Application of an anti-slip coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x10x5x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.59 kg / 1.31 LBS
592.5 g / 5.8 N
1 mm
13%
 1.48 kg / 3.27 LBS
1481.3 g / 14.5 N
2 mm
25%
 2.96 kg / 6.53 LBS
2962.5 g / 29.1 N
3 mm
38%
 4.44 kg / 9.80 LBS
4443.8 g / 43.6 N
5 mm
63%
 7.41 kg / 16.33 LBS
7406.3 g / 72.7 N
10 mm
100%
 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
11 mm
100%
 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
12 mm
100%
 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
A thin metal plate is incapable of absorb the full magnetic flux, which weakens actual performance of the magnet. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To achieve full efficiency of this magnet's potential, you need a suitably thick element of steel. The saturation effect means that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - resistance threshold
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
Classic neodymiums lose parameters past the thermal threshold. Protect against heat – excessive heat can permanently destroy this magnet. As the temperature rises, the neodymium's force briefly decreases. Do not use this product in hot environments higher than its operating temperature limit. Too high temperature will result in destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
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
Two magnets interact from a wider radius than a neodymium and metal setup. The connection of two magnets produces a massive flux and a larger range of performance. Designing a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Note: Calculations apply to shear force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - 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
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 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
Extremely neodym field poses a large risk to IT equipment as well as pacemakers. These neodymiums produce a field that prevents correct functioning of digital equipment. Notice: the unseen radiation acts through matter and glass. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (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
Magnetic elements are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with powerful specimens.

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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Flux value emitted by the magnet pole. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. computer case) severely limits 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.

Engineering data and GPSR
Chemical composition
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: 020397-2026
Measurement Calculator
Pulling force
Magnetic Induction
Simply complete one field, and the calculator calculate everything else for you.

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Component MPL 40x10x5x2[7/3.5] / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 116.27 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 11.85 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 11.85 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
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. 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. 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 40x10x5 mm and a self-weight of 15 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of rare earth magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • Neodymium magnets remain remarkably resistant to magnetic field loss caused by magnetic disturbances,
  • Thanks to the shimmering finish, the surface of Ni-Cu-Ni, gold, or silver gives an modern appearance,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual forming as well as modifying to individual needs,
  • Significant place in high-tech industry – they find application in magnetic memories, electric drive systems, medical equipment, as well as other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The load parameter shown refers to the peak performance, measured under optimal environment, meaning:
  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

Real force impacted by working environment parameters, such as (from priority):
  • Distance – existence of foreign body (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
  • Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop handling magnets and wear gloves.

Do not give to children

Strictly keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are tragic.

Threat to electronics

Device Safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

GPS and phone interference

Remember: rare earth magnets produce a field that disrupts precision electronics. Maintain a separation from your mobile, device, and GPS.

Fragile material

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets will cause them shattering into small pieces.

Combustion hazard

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Life threat

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Crushing force

Protect your hands. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Be careful!

Handling rules

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Security! Looking for details? Check our post: Are neodymium magnets dangerous?