Product available Ships today (order by 14:00) CO2 GPSR PPWR REACH

MW 12x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010022

GTIN/EAN: 5906301810216

5.00
Load capacity 4.93 kg / 48.32 N Magnetic Induction 495.50 mT / 4955 Gs
Diameter Ø
12 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
6.79 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

2.01net / pcs

2.47 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?

Quantity
Net
Gross
price from 1 pcs
2.01 zł
2.47 zł
price from 300 pcs
1.889 zł
2.32 zł
price from 1250 pcs
1.769 zł
2.18 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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

Physical analysis of the product - data

These information represent the outcome of a mathematical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static 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
strong
1 mm 4139 Gs
413.9 mT
3.44 kg / 7.59 LBS
3445.0 g / 33.8 N
strong
2 mm 3356 Gs
335.6 mT
2.26 kg / 4.99 LBS
2264.2 g / 22.2 N
strong
3 mm 2670 Gs
267.0 mT
1.43 kg / 3.16 LBS
1433.5 g / 14.1 N
weak grip
5 mm 1660 Gs
166.0 mT
0.55 kg / 1.22 LBS
554.1 g / 5.4 N
weak grip
10 mm 565 Gs
56.5 mT
0.06 kg / 0.14 LBS
64.3 g / 0.6 N
weak grip
15 mm 243 Gs
24.3 mT
0.01 kg / 0.03 LBS
11.8 g / 0.1 N
weak grip
20 mm 124 Gs
12.4 mT
0.00 kg / 0.01 LBS
3.1 g / 0.0 N
weak grip
30 mm 45 Gs
4.5 mT
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
weak grip
50 mm 11 Gs
1.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Sliding load (wall)
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

Table 3: Vertical assembly (sliding) - 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

Table 4: Material efficiency (saturation) - 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

Table 5: Thermal resistance (material behavior) - power drop
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

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
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

Table 7: Safety (HSE) (electronics) - 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
Mobile device 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) - collision effects
MW 12x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.99 km/h
(5.83 m/s)
0.12 J
30 mm 21.17 km/h
(5.88 m/s)
0.12 J
50 mm 21.17 km/h
(5.88 m/s)
0.12 J
100 mm 21.17 km/h
(5.88 m/s)
0.12 J

Table 9: Coating parameters (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)

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

Parameter Value SI Unit / Description
Magnetic Flux 5 650 Mx 56.5 µWb
Pc Coefficient 0.71 High (Stable)

Table 11: Underwater work (magnet fishing)
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%
Warning: 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

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

2. Efficiency vs thickness

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

3. Temperature resistance

*For N38 material, the critical limit is 80°C.

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

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

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 and environmental data

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

Force (pull)


Field Strength

View also proposals

The offered product is an exceptionally strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø12x8 mm, guarantees optimal power. The MW 12x8 / N38 component is characterized by an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 4.93 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 48.32 N with a weight of only 6.79 g, this cylindrical magnet 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 stability in industry, anaerobic resins 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 industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger 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 key parameter here is the lifting capacity amounting to approximately 4.93 kg (force ~48.32 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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 mm. 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 through the diameter if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to magnetic field loss due to external fields,
  • By using a decorative layer of nickel, the element acquires an elegant look,
  • Magnetic induction on the surface of the magnet remains very high,
  • 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...
  • Thanks to modularity in forming and the capacity to customize to complex applications,
  • Huge importance in advanced technology sectors – they are utilized in magnetic memories, electromotive mechanisms, medical equipment, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Limitations

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise 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 threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price is higher than average,

Pull force analysis

Highest magnetic holding forcewhat affects it?

Breakaway force is the result of a measurement for ideal contact conditions, assuming:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Determinants of lifting force in real conditions

In real-world applications, the actual holding force depends on several key aspects, ranked from most significant:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several 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.
  • Plate material – mild steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
  • Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Warnings
Safe distance

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Shattering risk

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Bone fractures

Risk of injury: The attraction force is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Powerful field

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Sensitization to coating

A percentage of the population experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Extended handling may cause skin redness. It is best to use safety gloves.

Precision electronics

GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Combustion hazard

Powder produced during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Choking Hazard

NdFeB magnets are not intended for children. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.

Demagnetization risk

Keep cool. Neodymium magnets are susceptible to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Implant safety

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?