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MW 7x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010099

GTIN/EAN: 5906301810988

5.00

Diameter Ø

7 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.58 g

Magnetization Direction

↑ axial

Load capacity

0.99 kg / 9.76 N

Magnetic Induction

307.23 mT / 3072 Gs

Coating

[NiCuNi] Nickel

0.381 with VAT / pcs + price for transport

0.310 ZŁ net + 23% VAT / pcs

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Technical - MW 7x2 / N38 - cylindrical magnet

Specification / characteristics - MW 7x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010099
GTIN/EAN 5906301810988
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 7 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 0.58 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.99 kg / 9.76 N
Magnetic Induction ~ ? 307.23 mT / 3072 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 7x2 / 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 modeling of the product - technical parameters

Presented information constitute the outcome of a mathematical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MW 7x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 3070 Gs
307.0 mT
0.99 kg / 990.0 g
9.7 N
safe
1 mm 2332 Gs
233.2 mT
0.57 kg / 571.1 g
5.6 N
safe
2 mm 1590 Gs
159.0 mT
0.27 kg / 265.5 g
2.6 N
safe
3 mm 1044 Gs
104.4 mT
0.11 kg / 114.6 g
1.1 N
safe
5 mm 466 Gs
46.6 mT
0.02 kg / 22.8 g
0.2 N
safe
10 mm 100 Gs
10.0 mT
0.00 kg / 1.1 g
0.0 N
safe
15 mm 35 Gs
3.5 mT
0.00 kg / 0.1 g
0.0 N
safe
20 mm 16 Gs
1.6 mT
0.00 kg / 0.0 g
0.0 N
safe
30 mm 5 Gs
0.5 mT
0.00 kg / 0.0 g
0.0 N
safe
50 mm 1 Gs
0.1 mT
0.00 kg / 0.0 g
0.0 N
safe

Table 2: Sliding force (vertical surface)
MW 7x2 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.20 kg / 198.0 g
1.9 N
1 mm Stal (~0.2) 0.11 kg / 114.0 g
1.1 N
2 mm Stal (~0.2) 0.05 kg / 54.0 g
0.5 N
3 mm Stal (~0.2) 0.02 kg / 22.0 g
0.2 N
5 mm Stal (~0.2) 0.00 kg / 4.0 g
0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MW 7x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.30 kg / 297.0 g
2.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.20 kg / 198.0 g
1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 99.0 g
1.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.50 kg / 495.0 g
4.9 N

Table 4: Steel thickness (substrate influence) - power losses
MW 7x2 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.10 kg / 99.0 g
1.0 N
1 mm
25%
0.25 kg / 247.5 g
2.4 N
2 mm
50%
0.50 kg / 495.0 g
4.9 N
5 mm
100%
0.99 kg / 990.0 g
9.7 N
10 mm
100%
0.99 kg / 990.0 g
9.7 N

Table 5: Thermal resistance (material behavior) - resistance threshold
MW 7x2 / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 0.99 kg / 990.0 g
9.7 N
OK
40 °C -2.2% 0.97 kg / 968.2 g
9.5 N
OK
60 °C -4.4% 0.95 kg / 946.4 g
9.3 N
80 °C -6.6% 0.92 kg / 924.7 g
9.1 N
100 °C -28.8% 0.70 kg / 704.9 g
6.9 N

Table 6: Two magnets (attraction) - forces in the system
MW 7x2 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 2.24 kg / 2236 g
21.9 N
4 653 Gs
N/A
1 mm 1.76 kg / 1764 g
17.3 N
5 454 Gs
1.59 kg / 1588 g
15.6 N
~0 Gs
2 mm 1.29 kg / 1290 g
12.7 N
4 663 Gs
1.16 kg / 1161 g
11.4 N
~0 Gs
3 mm 0.89 kg / 895 g
8.8 N
3 884 Gs
0.81 kg / 805 g
7.9 N
~0 Gs
5 mm 0.40 kg / 395 g
3.9 N
2 581 Gs
0.36 kg / 356 g
3.5 N
~0 Gs
10 mm 0.05 kg / 52 g
0.5 N
932 Gs
0.05 kg / 46 g
0.5 N
~0 Gs
20 mm 0.00 kg / 2 g
0.0 N
200 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
50 mm 0.00 kg / 0 g
0.0 N
17 Gs
0.00 kg / 0 g
0.0 N
~0 Gs

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

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Timepiece 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Collisions (cracking risk) - warning
MW 7x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 41.69 km/h
(11.58 m/s)
0.04 J
30 mm 72.17 km/h
(20.05 m/s)
0.12 J
50 mm 93.17 km/h
(25.88 m/s)
0.19 J
100 mm 131.76 km/h
(36.60 m/s)
0.39 J

Table 9: Coating parameters (durability)
MW 7x2 / 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 7x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 284 Mx 12.8 µWb
Pc Coefficient 0.39 Low (Flat)

Table 11: Physics of underwater searching
MW 7x2 / N38

Environment Effective steel pull Effect
Air (land) 0.99 kg Standard
Water (riverbed) 1.13 kg
(+0.14 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.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.39

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.

Technical specification and ecology
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%
Ecology and recycling (GPSR)
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: 010099-2025
Magnet Unit Converter
Force (pull)

Field Strength

Other offers

The offered product is an exceptionally strong cylindrical magnet, produced from advanced NdFeB material, which, at dimensions of Ø7x2 mm, guarantees optimal power. This specific item is characterized by a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 0.99 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.
This model is ideal for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 9.76 N with a weight of only 0.58 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 7.1 mm) using 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.
Magnets NdFeB grade N38 are strong enough for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø7x2), 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 Ø7x2 mm, which, at a weight of 0.58 g, makes it an element with impressive magnetic energy density. The value of 9.76 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.58 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 2 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

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by external field influence,
  • In other words, due to the reflective layer of nickel, the element becomes visually attractive,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to flexibility in shaping and the capacity to customize to complex applications,
  • Significant place in innovative solutions – they find application in HDD drives, electric motors, medical equipment, and technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
  • Health risk to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Additionally, small elements of these products are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat it depends on?

Holding force of 0.99 kg is a measurement result conducted under specific, ideal conditions:
  • using a sheet made of mild steel, acting as a ideal flux conductor
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • without any air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Bear in mind that the magnet holding may be lower depending on elements below, starting with the most relevant:
  • Distance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Keep away from electronics

Remember: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, tablet, and navigation systems.

Fire risk

Dust created during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Allergic reactions

Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, immediately stop working with magnets and wear gloves.

Risk of cracking

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Immense force

Be careful. Rare earth magnets attract from a distance and snap with massive power, often faster than you can move away.

Bone fractures

Large magnets can crush fingers instantly. Never put your hand between two strong magnets.

Implant safety

Warning for patients: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Cards and drives

Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Adults only

Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Keep out of reach of children and animals.

Heat warning

Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Safety First! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98