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MW 38x3.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010062

GTIN/EAN: 5906301810612

5.00

Diameter Ø

38 mm [±0,1 mm]

Height

3.5 mm [±0,1 mm]

Weight

29.77 g

Magnetization Direction

↑ axial

Load capacity

5.09 kg / 49.91 N

Magnetic Induction

112.31 mT / 1123 Gs

Coating

[NiCuNi] Nickel

15.83 with VAT / pcs + price for transport

12.87 ZŁ net + 23% VAT / pcs

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Technical data of the product - MW 38x3.5 / N38 - cylindrical magnet

Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010062
GTIN/EAN 5906301810612
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 38 mm [±0,1 mm]
Height 3.5 mm [±0,1 mm]
Weight 29.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.09 kg / 49.91 N
Magnetic Induction ~ ? 112.31 mT / 1123 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 38x3.5 / 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 - technical parameters

The following information are the outcome of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - power drop
MW 38x3.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1123 Gs
112.3 mT
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
strong
1 mm 1103 Gs
110.3 mT
4.91 kg / 10.82 lbs
4910.1 g / 48.2 N
strong
2 mm 1075 Gs
107.5 mT
4.66 kg / 10.28 lbs
4663.0 g / 45.7 N
strong
3 mm 1040 Gs
104.0 mT
4.36 kg / 9.62 lbs
4364.2 g / 42.8 N
strong
5 mm 954 Gs
95.4 mT
3.67 kg / 8.10 lbs
3673.1 g / 36.0 N
strong
10 mm 703 Gs
70.3 mT
2.00 kg / 4.40 lbs
1997.1 g / 19.6 N
low risk
15 mm 483 Gs
48.3 mT
0.94 kg / 2.08 lbs
943.2 g / 9.3 N
low risk
20 mm 326 Gs
32.6 mT
0.43 kg / 0.95 lbs
429.7 g / 4.2 N
low risk
30 mm 155 Gs
15.5 mT
0.10 kg / 0.21 lbs
97.1 g / 1.0 N
low risk
50 mm 47 Gs
4.7 mT
0.01 kg / 0.02 lbs
8.9 g / 0.1 N
low risk

Table 2: Slippage capacity (wall)
MW 38x3.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.98 kg / 2.16 lbs
982.0 g / 9.6 N
2 mm Stal (~0.2) 0.93 kg / 2.05 lbs
932.0 g / 9.1 N
3 mm Stal (~0.2) 0.87 kg / 1.92 lbs
872.0 g / 8.6 N
5 mm Stal (~0.2) 0.73 kg / 1.62 lbs
734.0 g / 7.2 N
10 mm Stal (~0.2) 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
15 mm Stal (~0.2) 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
20 mm Stal (~0.2) 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MW 38x3.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.53 kg / 3.37 lbs
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 lbs
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 lbs
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 lbs
2545.0 g / 25.0 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 38x3.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.51 kg / 1.12 lbs
509.0 g / 5.0 N
1 mm
25%
1.27 kg / 2.81 lbs
1272.5 g / 12.5 N
2 mm
50%
2.55 kg / 5.61 lbs
2545.0 g / 25.0 N
3 mm
75%
3.82 kg / 8.42 lbs
3817.5 g / 37.4 N
5 mm
100%
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
10 mm
100%
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
11 mm
100%
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
12 mm
100%
5.09 kg / 11.22 lbs
5090.0 g / 49.9 N

Table 5: Thermal resistance (material behavior) - thermal limit
MW 38x3.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.09 kg / 11.22 lbs
5090.0 g / 49.9 N
OK
40 °C -2.2% 4.98 kg / 10.97 lbs
4978.0 g / 48.8 N
OK
60 °C -4.4% 4.87 kg / 10.73 lbs
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 lbs
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 lbs
3624.1 g / 35.6 N

Table 6: Two magnets (attraction) - field range
MW 38x3.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.82 kg / 19.44 lbs
2 143 Gs
1.32 kg / 2.92 lbs
1323 g / 13.0 N
N/A
1 mm 8.68 kg / 19.13 lbs
2 228 Gs
1.30 kg / 2.87 lbs
1302 g / 12.8 N
7.81 kg / 17.22 lbs
~0 Gs
2 mm 8.51 kg / 18.75 lbs
2 206 Gs
1.28 kg / 2.81 lbs
1276 g / 12.5 N
7.66 kg / 16.88 lbs
~0 Gs
3 mm 8.31 kg / 18.31 lbs
2 180 Gs
1.25 kg / 2.75 lbs
1246 g / 12.2 N
7.47 kg / 16.48 lbs
~0 Gs
5 mm 7.83 kg / 17.26 lbs
2 116 Gs
1.17 kg / 2.59 lbs
1174 g / 11.5 N
7.05 kg / 15.53 lbs
~0 Gs
10 mm 6.36 kg / 14.03 lbs
1 908 Gs
0.95 kg / 2.10 lbs
955 g / 9.4 N
5.73 kg / 12.63 lbs
~0 Gs
20 mm 3.46 kg / 7.63 lbs
1 407 Gs
0.52 kg / 1.14 lbs
519 g / 5.1 N
3.11 kg / 6.87 lbs
~0 Gs
50 mm 0.35 kg / 0.76 lbs
445 Gs
0.05 kg / 0.11 lbs
52 g / 0.5 N
0.31 kg / 0.69 lbs
~0 Gs
60 mm 0.17 kg / 0.37 lbs
310 Gs
0.03 kg / 0.06 lbs
25 g / 0.2 N
0.15 kg / 0.33 lbs
~0 Gs
70 mm 0.09 kg / 0.19 lbs
222 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
0.08 kg / 0.17 lbs
~0 Gs
80 mm 0.05 kg / 0.10 lbs
163 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
0.04 kg / 0.09 lbs
~0 Gs
90 mm 0.03 kg / 0.06 lbs
122 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
0.02 kg / 0.05 lbs
~0 Gs
100 mm 0.02 kg / 0.03 lbs
94 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
0.01 kg / 0.03 lbs
~0 Gs

Table 7: Protective zones (implants) - warnings
MW 38x3.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Timepiece 20 Gs (2.0 mT) 7.0 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Collisions (cracking risk) - collision effects
MW 38x3.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.10 km/h
(4.47 m/s)
0.30 J
30 mm 23.11 km/h
(6.42 m/s)
0.61 J
50 mm 29.52 km/h
(8.20 m/s)
1.00 J
100 mm 41.70 km/h
(11.58 m/s)
2.00 J

Table 9: Coating parameters (durability)
MW 38x3.5 / 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)

Table 10: Construction data (Pc)
MW 38x3.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 022 Mx 170.2 µWb
Pc Coefficient 0.14 Low (Flat)

Table 11: Underwater work (magnet fishing)
MW 38x3.5 / N38

Environment Effective steel pull Effect
Air (land) 5.09 kg Standard
Water (riverbed) 5.83 kg
(+0.74 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Note: On a vertical wall, the magnet holds just a fraction of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Heat tolerance

*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) = 0.14

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%
Sustainability
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: 010062-2026
Measurement Calculator
Magnet pull force

Magnetic Field

View also proposals

This product is an exceptionally strong cylindrical magnet, composed of modern NdFeB material, which, at dimensions of Ø38x3.5 mm, guarantees the highest energy density. The MW 38x3.5 / N38 model is characterized by a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 5.09 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 49.91 N with a weight of only 29.77 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 38.1 mm) using epoxy glues. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø38x3.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 38 mm and height 3.5 mm. The key parameter here is the holding force amounting to approximately 5.09 kg (force ~49.91 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 3.5 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
  • They maintain their magnetic properties even under strong external field,
  • By applying a lustrous coating of nickel, the element gains an aesthetic look,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of detailed creating as well as modifying to individual needs,
  • Universal use in innovative solutions – they are commonly used in data components, brushless drives, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Detachment force of the magnet in optimal conditionswhat affects it?

Holding force of 5.09 kg is a measurement result conducted under the following configuration:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • whose thickness reaches at least 10 mm
  • characterized by even structure
  • with direct contact (no paint)
  • during pulling in a direction vertical to the plane
  • at room temperature

Practical aspects of lifting capacity – factors

Effective lifting capacity impacted by specific conditions, including (from priority):
  • Clearance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Do not underestimate power

Use magnets consciously. Their huge power can surprise even professionals. Be vigilant and respect their power.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Fire warning

Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or choose versions in plastic housing.

Life threat

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Magnets are brittle

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Cards and drives

Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Adults only

Absolutely store magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are fatal.

Phone sensors

Navigation devices and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Bone fractures

Risk of injury: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Important! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98