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MW 12x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010022

GTIN/EAN: 5906301810216

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

4.93 kg / 48.32 N

Magnetic Induction

495.50 mT / 4955 Gs

Coating

[NiCuNi] Nickel

view parameters »

2.47 ZŁ with VAT / pcs + price for transport

2.01 ZŁ net + 23% VAT / pcs

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Technical details - MW 12x8 / N38 - cylindrical magnet

Specification / characteristics - MW 12x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010022
GTIN/EAN 5906301810216
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 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 6.79 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.93 kg / 48.32 N
Magnetic Induction ~ ? 495.50 mT / 4955 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x8 / 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

Engineering simulation of the magnet - report

The following information constitute the direct effect of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these calculations as a reference point for designers.

Table 1: Static pull force (pull vs distance) - interaction chart
MW 12x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4952 Gs
495.2 mT
 4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
 medium risk
1 mm 4139 Gs
413.9 mT
 3.44 kg / 7.59 LBS
3445.0 g / 33.8 N
 medium risk
2 mm 3356 Gs
335.6 mT
 2.26 kg / 4.99 LBS
2264.2 g / 22.2 N
 medium risk
3 mm 2670 Gs
267.0 mT
 1.43 kg / 3.16 LBS
1433.5 g / 14.1 N
 low risk
5 mm 1660 Gs
166.0 mT
 0.55 kg / 1.22 LBS
554.1 g / 5.4 N
 low risk
10 mm 565 Gs
56.5 mT
 0.06 kg / 0.14 LBS
64.3 g / 0.6 N
 low risk
15 mm 243 Gs
24.3 mT
 0.01 kg / 0.03 LBS
11.8 g / 0.1 N
 low risk
20 mm 124 Gs
12.4 mT
 0.00 kg / 0.01 LBS
3.1 g / 0.0 N
 low risk
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.00 LBS
0.4 g / 0.0 N
 low risk
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Grip strength drops sharply with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., contamination, varnish, rust) noticeably weakens the grip. Magnetic products hold most effectively in perfect adhesion; distance drastically cuts the force. Analyze how rapidly the load capacity fall, when the product does not touch directly to the steel surface. When designing the assembly, eliminate unnecessary gaps.

Table 2: Shear capacity (vertical surface)
MW 12x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.99 kg / 2.17 LBS
986.0 g / 9.7 N
1 mm Stal (~0.2) 0.69 kg / 1.52 LBS
688.0 g / 6.7 N
2 mm Stal (~0.2) 0.45 kg / 1.00 LBS
452.0 g / 4.4 N
3 mm Stal (~0.2) 0.29 kg / 0.63 LBS
286.0 g / 2.8 N
5 mm Stal (~0.2) 0.11 kg / 0.24 LBS
110.0 g / 1.1 N
10 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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 shear load needed to cause the shifting of the magnet vertically on a upright steel plate (considering standard friction coefficient). The holding force is relative to the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 12x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.48 kg / 3.26 LBS
1479.0 g / 14.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.99 kg / 2.17 LBS
986.0 g / 9.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.49 kg / 1.09 LBS
493.0 g / 4.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.47 kg / 5.43 LBS
2465.0 g / 24.2 N
When hanging a element on a vertical plane (e.g., a car body), it you can count on just about 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that magnets slide down faster than they pull off. Planning a vertical fastening? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will give way down under a noticeably lighter cargo. Application of an anti-slip coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 12x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.49 kg / 1.09 LBS
493.0 g / 4.8 N
1 mm
25%
 1.23 kg / 2.72 LBS
1232.5 g / 12.1 N
2 mm
50%
 2.47 kg / 5.43 LBS
2465.0 g / 24.2 N
3 mm
75%
 3.70 kg / 8.15 LBS
3697.5 g / 36.3 N
5 mm
100%
 4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
10 mm
100%
 4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
11 mm
100%
 4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
12 mm
100%
 4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
A thin sheet is incapable of focus the full magnetic flux, which squanders power of the holder. Should you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick backing of metal. The saturation phenomenon means that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MW 12x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.93 kg / 10.87 LBS
4930.0 g / 48.4 N
 OK
40 °C -2.2% 4.82 kg / 10.63 LBS
4821.5 g / 47.3 N
 OK
60 °C -4.4% 4.71 kg / 10.39 LBS
4713.1 g / 46.2 N
 OK
80 °C -6.6% 4.60 kg / 10.15 LBS
4604.6 g / 45.2 N
100 °C -28.8% 3.51 kg / 7.74 LBS
3510.2 g / 34.4 N
Standard neodymium magnets lose power past the thermal threshold. Watch out for overheating – heat can irreversibly damage this magnet. As the temperature rises, the neodymium's capacity briefly decreases. Avoid using this magnet near heat sources exceeding its working range. Too high temperature will cause irreversible degradation of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 12x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.10 kg / 37.69 LBS
5 795 Gs
2.56 kg / 5.65 LBS
2565 g / 25.2 N
 N/A
1 mm 14.44 kg / 31.83 LBS
9 101 Gs
2.17 kg / 4.77 LBS
2166 g / 21.2 N
 12.99 kg / 28.64 LBS
~0 Gs
2 mm 11.95 kg / 26.34 LBS
8 279 Gs
1.79 kg / 3.95 LBS
1792 g / 17.6 N
 10.75 kg / 23.71 LBS
~0 Gs
3 mm 9.74 kg / 21.48 LBS
7 477 Gs
1.46 kg / 3.22 LBS
1462 g / 14.3 N
 8.77 kg / 19.33 LBS
~0 Gs
5 mm 6.27 kg / 13.82 LBS
5 997 Gs
0.94 kg / 2.07 LBS
940 g / 9.2 N
 5.64 kg / 12.44 LBS
~0 Gs
10 mm 1.92 kg / 4.24 LBS
3 320 Gs
0.29 kg / 0.64 LBS
288 g / 2.8 N
 1.73 kg / 3.81 LBS
~0 Gs
20 mm 0.22 kg / 0.49 LBS
1 131 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.44 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
142 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
89 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
59 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
41 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
30 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
23 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 much further distance than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a further horizon of performance. Designing a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the impact force is massive. The repulsion force is a bit weaker than the attraction, but still impressive.
*The magnetic induction between like poles drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Attention: Estimates refer to sliding force of two same neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MW 12x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.5 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
Extremely neodym field is a real danger to IT equipment and pacemakers. These NdFeB products generate a field that destroys function of digital equipment. Notice: the unseen radiation passes through tissues and housings. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MW 12x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.40 km/h
(7.61 m/s)
 0.20 J
30 mm 47.07 km/h
(13.08 m/s)
 0.58 J
50 mm 60.77 km/h
(16.88 m/s)
 0.97 J
100 mm 85.94 km/h
(23.87 m/s)
 1.93 J
Neodymium magnets are very brittle – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or injury to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 12x8 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MW 12x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 650 Mx 56.5 µWb
Pc Coefficient 0.71 High (Stable)
Flux value emitted by the pole surface. Essential parameter when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MW 12x8 / N38

Environment Effective steel pull Effect
Air (land) 4.93 kg Standard
Water (riverbed) 5.64 kg
(+0.71 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71

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
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
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: 010022-2026
Quick Unit Converter
Magnet pull force
Magnetic Induction
Enter data in one of the inputs, and all other values convert automatically.

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The presented product is a very strong cylindrical magnet, manufactured from durable NdFeB material, which, with dimensions of Ø12x8 mm, guarantees the highest energy density. This specific item is characterized by a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 4.93 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 48.32 N with a weight of only 6.79 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø12x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12 mm and height 8 mm. The value of 48.32 N means that the magnet is capable of holding a weight many times exceeding its own mass of 6.79 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros as well as cons of rare earth magnets.

Pros

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • Their strength remains stable, and after around ten years it drops only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by external field influence,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Due to the ability of flexible forming and customization to unique solutions, neodymium magnets can be produced in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Significant place in modern industrial fields – they are used in data components, motor assemblies, medical equipment, as well as industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. 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
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complicated shapes in magnets, we recommend using a housing - magnetic mount.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Best holding force of the magnet in ideal parameters – what contributes to it?

The declared magnet strength represents the limit force, measured under optimal environment, meaning:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • with a surface free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Holding efficiency is influenced by specific conditions, including (from most important):
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content reduce magnetic properties and lifting capacity.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Material brittleness

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Respect the power

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

Thermal limits

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

Crushing risk

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

Nickel coating and allergies

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness happens, cease handling magnets and wear gloves.

Do not drill into magnets

Fire warning: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Product not for children

NdFeB magnets are not suitable for play. Accidental ingestion of several magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.

Cards and drives

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

Pacemakers

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Phone sensors

Be aware: neodymium magnets produce a field that interferes with precision electronics. Keep a safe distance from your phone, tablet, and navigation systems.

Caution! Learn more about hazards in the article: Safety of working with magnets.