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MW 12.5x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010014

GTIN/EAN: 5906301810131

5.00

Diameter Ø

12.5 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

1.84 g

Magnetization Direction

↑ axial

Load capacity

1.42 kg / 13.89 N

Magnetic Induction

188.88 mT / 1889 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

0.935 ZŁ with VAT / pcs + price for transport

0.760 ZŁ net + 23% VAT / pcs

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Technical parameters of the product - MW 12.5x2 / N38 - cylindrical magnet

Specification / characteristics - MW 12.5x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010014
GTIN/EAN 5906301810131
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 12.5 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 1.84 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.42 kg / 13.89 N
Magnetic Induction ~ ? 188.88 mT / 1889 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12.5x2 / N38 - cylindrical 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

Technical modeling of the assembly - report

Presented data represent the direct effect of a engineering analysis. Results are based on algorithms for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - characteristics
MW 12.5x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1888 Gs
188.8 mT
 1.42 kg / 3.13 lbs
1420.0 g / 13.9 N
 weak grip
1 mm 1703 Gs
170.3 mT
 1.16 kg / 2.55 lbs
1155.6 g / 11.3 N
 weak grip
2 mm 1453 Gs
145.3 mT
 0.84 kg / 1.85 lbs
840.3 g / 8.2 N
 weak grip
3 mm 1190 Gs
119.0 mT
 0.56 kg / 1.24 lbs
564.1 g / 5.5 N
 weak grip
5 mm 752 Gs
75.2 mT
 0.23 kg / 0.50 lbs
225.0 g / 2.2 N
 weak grip
10 mm 241 Gs
24.1 mT
 0.02 kg / 0.05 lbs
23.2 g / 0.2 N
 weak grip
15 mm 96 Gs
9.6 mT
 0.00 kg / 0.01 lbs
3.7 g / 0.0 N
 weak grip
20 mm 46 Gs
4.6 mT
 0.00 kg / 0.00 lbs
0.9 g / 0.0 N
 weak grip
30 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Pulling power drops drastically with every subsequent millimeter of spacing. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) noticeably weakens the grip. Magnetic products work strongest during direct contact; gap drastically cuts the power. Observe how rapidly the parameters plummet, when the magnet does not adhere flatly to the steel surface. When designing the arrangement, eliminate redundant distances.

Table 2: Sliding load (vertical surface)
MW 12.5x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.28 kg / 0.63 lbs
284.0 g / 2.8 N
1 mm Stal (~0.2) 0.23 kg / 0.51 lbs
232.0 g / 2.3 N
2 mm Stal (~0.2) 0.17 kg / 0.37 lbs
168.0 g / 1.6 N
3 mm Stal (~0.2) 0.11 kg / 0.25 lbs
112.0 g / 1.1 N
5 mm Stal (~0.2) 0.05 kg / 0.10 lbs
46.0 g / 0.5 N
10 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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
The table below shows the approximate holding capacity sufficient to start the sliding of the magnet vertically along a vertical steel wall (assuming typical friction coefficient). This value varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 12.5x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.43 kg / 0.94 lbs
426.0 g / 4.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.28 kg / 0.63 lbs
284.0 g / 2.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.14 kg / 0.31 lbs
142.0 g / 1.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.71 kg / 1.57 lbs
710.0 g / 7.0 N
When placing a magnet on a vertical plane (e.g., a car body), it you can count on just about 1/5 of its nominal power. Gravitational force and a low friction coefficient mean that holders slide down faster than they detach. Planning a vertical fastening? Remember that the shear force is much weaker than the maximum static pull force. On a slippery surface, the element will slip down under a significantly smaller weight. Using a rubber layer can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 12.5x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.14 kg / 0.31 lbs
142.0 g / 1.4 N
1 mm
25%
 0.36 kg / 0.78 lbs
355.0 g / 3.5 N
2 mm
50%
 0.71 kg / 1.57 lbs
710.0 g / 7.0 N
3 mm
75%
 1.07 kg / 2.35 lbs
1065.0 g / 10.4 N
5 mm
100%
 1.42 kg / 3.13 lbs
1420.0 g / 13.9 N
10 mm
100%
 1.42 kg / 3.13 lbs
1420.0 g / 13.9 N
11 mm
100%
 1.42 kg / 3.13 lbs
1420.0 g / 13.9 N
12 mm
100%
 1.42 kg / 3.13 lbs
1420.0 g / 13.9 N
A thin metal plate is unable to focus the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the magnet holds weaker. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - power drop
MW 12.5x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.42 kg / 3.13 lbs
1420.0 g / 13.9 N
 OK
40 °C -2.2% 1.39 kg / 3.06 lbs
1388.8 g / 13.6 N
 OK
60 °C -4.4% 1.36 kg / 2.99 lbs
1357.5 g / 13.3 N
80 °C -6.6% 1.33 kg / 2.92 lbs
1326.3 g / 13.0 N
100 °C -28.8% 1.01 kg / 2.23 lbs
1011.0 g / 9.9 N
Standard neodymium magnets irreversibly lose parameters past the thermal threshold. Protect against heat – high temperature can irreversibly destroy this product. With increasing heat, the neodymium's force momentarily decreases. Refrain from using this magnet close to heaters exceeding its working range. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MW 12.5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.70 kg / 5.95 lbs
3 338 Gs
0.40 kg / 0.89 lbs
405 g / 4.0 N
 N/A
1 mm 2.47 kg / 5.45 lbs
3 616 Gs
0.37 kg / 0.82 lbs
371 g / 3.6 N
 2.23 kg / 4.91 lbs
~0 Gs
2 mm 2.20 kg / 4.84 lbs
3 407 Gs
0.33 kg / 0.73 lbs
329 g / 3.2 N
 1.98 kg / 4.36 lbs
~0 Gs
3 mm 1.89 kg / 4.18 lbs
3 165 Gs
0.28 kg / 0.63 lbs
284 g / 2.8 N
 1.71 kg / 3.76 lbs
~0 Gs
5 mm 1.32 kg / 2.91 lbs
2 640 Gs
0.20 kg / 0.44 lbs
198 g / 1.9 N
 1.19 kg / 2.62 lbs
~0 Gs
10 mm 0.43 kg / 0.94 lbs
1 503 Gs
0.06 kg / 0.14 lbs
64 g / 0.6 N
 0.38 kg / 0.85 lbs
~0 Gs
20 mm 0.04 kg / 0.10 lbs
483 Gs
0.01 kg / 0.01 lbs
7 g / 0.1 N
 0.04 kg / 0.09 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
51 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
31 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
20 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
14 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
10 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
7 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a significantly greater distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a larger range of action. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the collision energy is extreme. The levitation is slightly lower than the attraction, but still significant.
*Flux density for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Estimates show shear force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MW 12.5x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a real danger to electronics and medical implants. These magnets generate a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and glass. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MW 12.5x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.30 km/h
(7.86 m/s)
 0.06 J
30 mm 48.53 km/h
(13.48 m/s)
 0.17 J
50 mm 62.65 km/h
(17.40 m/s)
 0.28 J
100 mm 88.60 km/h
(24.61 m/s)
 0.56 J
NdFeB products are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Anti-corrosion coating durability
MW 12.5x2 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 12.5x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 810 Mx 28.1 µWb
Pc Coefficient 0.24 Low (Flat)
Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 12.5x2 / N38

Environment Effective steel pull Effect
Air (land) 1.42 kg Standard
Water (riverbed) 1.63 kg
(+0.21 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Caution: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.24

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.

Engineering data and GPSR
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: 010014-2026
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The presented product is a very strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø12.5x2 mm, guarantees the highest energy density. The MW 12.5x2 / N38 model is characterized by high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 1.42 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 13.89 N with a weight of only 1.84 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 12.5.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø12.5x2), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø12.5x2 mm, which, at a weight of 1.84 g, makes it an element with high magnetic energy density. The value of 13.89 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.84 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 12.5 mm. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Besides their immense strength, neodymium magnets offer the following advantages:
  • They do not lose power, even during around 10 years – the reduction in power is only ~1% (based on measurements),
  • Neodymium magnets are characterized by remarkably resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a shiny silver surface has an effective appearance,
  • Magnetic induction on the working part of the magnet remains impressive,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of accurate forming as well as optimizing to concrete conditions,
  • Huge importance in advanced technology sectors – they are utilized in HDD drives, electric drive systems, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a surface free of scratches
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction perpendicular to the plane
  • in neutral thermal conditions

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity depends on several key aspects, presented from crucial:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the holding force.

Safe handling of neodymium magnets
Protect data

Avoid bringing magnets close to a purse, computer, or TV. The magnetism can permanently damage these devices and wipe information from cards.

No play value

Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are tragic.

Machining danger

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

Beware of splinters

NdFeB magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets leads to them breaking into shards.

Heat sensitivity

Control the heat. Exposing the magnet to high heat will ruin its properties and pulling force.

Serious injuries

Pinching hazard: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Allergy Warning

A percentage of the population suffer from a contact allergy to nickel, which is the typical protective layer for NdFeB magnets. Extended handling can result in skin redness. It is best to wear safety gloves.

Immense force

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Medical interference

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Compass and GPS

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Warning! Need more info? Read our article: Are neodymium magnets dangerous?