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MW 18x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010037

GTIN/EAN: 5906301810360

5.00
Load capacity 0.95 kg / 9.34 N Magnetic Induction 101.91 mT / 1019 Gs
Diameter Ø
18 mm [±0,1 mm]
Height
1.5 mm [±0,1 mm]
Weight
2.86 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical specifications »

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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.

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Technical data - MW 18x1.5 / N38 - cylindrical magnet

Specification / characteristics - MW 18x1.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010037
GTIN/EAN 5906301810360
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 18 mm [±0,1 mm]
Height 1.5 mm [±0,1 mm]
Weight 2.86 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.95 kg / 9.34 N
Magnetic Induction ~ ? 101.91 mT / 1019 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 18x1.5 / 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

Technical analysis of the magnet - report

Presented values constitute the result of a physical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a reference point when designing systems.

Table 1: Static force (force vs gap) - power drop
MW 18x1.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1019 Gs
101.9 mT
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
 low risk
1 mm 975 Gs
97.5 mT
 0.87 kg / 1.92 pounds
869.2 g / 8.5 N
 low risk
2 mm 902 Gs
90.2 mT
 0.74 kg / 1.64 pounds
744.7 g / 7.3 N
 low risk
3 mm 812 Gs
81.2 mT
 0.60 kg / 1.33 pounds
603.4 g / 5.9 N
 low risk
5 mm 619 Gs
61.9 mT
 0.35 kg / 0.77 pounds
350.6 g / 3.4 N
 low risk
10 mm 274 Gs
27.4 mT
 0.07 kg / 0.15 pounds
68.7 g / 0.7 N
 low risk
15 mm 126 Gs
12.6 mT
 0.01 kg / 0.03 pounds
14.6 g / 0.1 N
 low risk
20 mm 65 Gs
6.5 mT
 0.00 kg / 0.01 pounds
3.9 g / 0.0 N
 low risk
30 mm 23 Gs
2.3 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 low risk
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Grip strength weakens sharply with every mm of distance. Note that even a very thin break (e.g., dirt, paint, rust) strongly reduces the pull force. Magnets hold strongest during direct contact; air break nullifies the power. Notice how quickly the parameters fall, when the magnet does not touch directly to the steel surface. When planning the arrangement, avoid unnecessary gaps.

Table 2: Vertical hold (wall)
MW 18x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.42 pounds
190.0 g / 1.9 N
1 mm Stal (~0.2) 0.17 kg / 0.38 pounds
174.0 g / 1.7 N
2 mm Stal (~0.2) 0.15 kg / 0.33 pounds
148.0 g / 1.5 N
3 mm Stal (~0.2) 0.12 kg / 0.26 pounds
120.0 g / 1.2 N
5 mm Stal (~0.2) 0.07 kg / 0.15 pounds
70.0 g / 0.7 N
10 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below defines the estimated holding capacity needed to start the shifting of the magnet downwards against a upright steel plate (considering standard friction). The holding force is a function of the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 18x1.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.29 kg / 0.63 pounds
285.0 g / 2.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.42 pounds
190.0 g / 1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 0.21 pounds
95.0 g / 0.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.48 kg / 1.05 pounds
475.0 g / 4.7 N
When hanging a element on a upright wall (e.g., a fridge), it you can count on only approx. 1/5 of its nominal power. Gravity as well as a low friction coefficient cause that holders move down faster than they pull off. Designing a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a painted metal, the magnet will slip down under a much lighter load. Application of an anti-slip pad can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MW 18x1.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.10 kg / 0.21 pounds
95.0 g / 0.9 N
1 mm
25%
 0.24 kg / 0.52 pounds
237.5 g / 2.3 N
2 mm
50%
 0.48 kg / 1.05 pounds
475.0 g / 4.7 N
3 mm
75%
 0.71 kg / 1.57 pounds
712.5 g / 7.0 N
5 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
10 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
11 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
12 mm
100%
 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
A thin metal plate cannot take in the entire magnetic field, which weakens actual performance of the magnet. Should you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To achieve full efficiency of this neodymium's potential, you require a sufficiently solid element of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the holder works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MW 18x1.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.95 kg / 2.09 pounds
950.0 g / 9.3 N
 OK
40 °C -2.2% 0.93 kg / 2.05 pounds
929.1 g / 9.1 N
 OK
60 °C -4.4% 0.91 kg / 2.00 pounds
908.2 g / 8.9 N
80 °C -6.6% 0.89 kg / 1.96 pounds
887.3 g / 8.7 N
100 °C -28.8% 0.68 kg / 1.49 pounds
676.4 g / 6.6 N
Standard neodymium magnets lose parameters past the thermal threshold. Protect against heat – excessive heat can permanently damage this magnet. As the temperature rises, the magnet's power temporarily lowers. Avoid using this magnet close to ovens higher than its safe range. Exceeding the critical threshold will cause irreversible degradation of magnetism.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 18x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.63 kg / 3.59 pounds
1 960 Gs
0.24 kg / 0.54 pounds
244 g / 2.4 N
 N/A
1 mm 1.57 kg / 3.47 pounds
2 002 Gs
0.24 kg / 0.52 pounds
236 g / 2.3 N
 1.41 kg / 3.12 pounds
~0 Gs
2 mm 1.49 kg / 3.29 pounds
1 949 Gs
0.22 kg / 0.49 pounds
224 g / 2.2 N
 1.34 kg / 2.96 pounds
~0 Gs
3 mm 1.39 kg / 3.06 pounds
1 883 Gs
0.21 kg / 0.46 pounds
209 g / 2.0 N
 1.25 kg / 2.76 pounds
~0 Gs
5 mm 1.16 kg / 2.55 pounds
1 717 Gs
0.17 kg / 0.38 pounds
174 g / 1.7 N
 1.04 kg / 2.30 pounds
~0 Gs
10 mm 0.60 kg / 1.33 pounds
1 238 Gs
0.09 kg / 0.20 pounds
90 g / 0.9 N
 0.54 kg / 1.19 pounds
~0 Gs
20 mm 0.12 kg / 0.26 pounds
548 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.23 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
74 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
46 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
30 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
21 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
15 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and steel combination. The setup of two magnets generates a stronger field and a further horizon of performance. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is massive. The levitation is marginally weaker than the attraction, but still large.
*Field value between like poles is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Figures refer to shear force of two identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MW 18x1.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a serious hazard to electronic devices as well as pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation acts through matter and housings. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MW 18x1.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.36 km/h
(5.38 m/s)
 0.04 J
30 mm 19.87 km/h
(5.52 m/s)
 0.04 J
50 mm 19.88 km/h
(5.52 m/s)
 0.04 J
100 mm 19.88 km/h
(5.52 m/s)
 0.04 J
Neodymium magnets are delicate – a violent impact against metal risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Surface protection spec
MW 18x1.5 / 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)
The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 18x1.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 519 Mx 35.2 µWb
Pc Coefficient 0.13 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 18x1.5 / N38

Environment Effective steel pull Effect
Air (land) 0.95 kg Standard
Water (riverbed) 1.09 kg
(+0.14 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13

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 specification and ecology

Chemical composition

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: 010037-2026
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The presented product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø18x1.5 mm, guarantees maximum efficiency. The MW 18x1.5 / N38 model features a tolerance of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 0.95 kg), this product is in stock from our warehouse in Poland, ensuring rapid 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 ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 9.34 N with a weight of only 2.86 g, this cylindrical magnet is indispensable in miniature devices 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 chipping the coating of this professional 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 frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø18x1.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 18 mm and height 1.5 mm. The key parameter here is the holding force amounting to approximately 0.95 kg (force ~9.34 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it 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 18 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 diametrically if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • They do not lose their magnetic properties even under external field action,
  • By applying a smooth layer of silver, the element presents an aesthetic look,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to versatility in forming and the ability to adapt to complex applications,
  • Huge importance in innovative solutions – they find application in HDD drives, electromotive mechanisms, advanced medical instruments, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these devices can disrupt the diagnostic process medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

Holding force of 0.95 kg is a measurement result performed under specific, ideal conditions:
  • on a plate made of mild steel, effectively closing the magnetic field
  • whose thickness reaches at least 10 mm
  • with a plane perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity results from many variables, ranked from the most important:
  • Distance – the presence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Electronic hazard

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

ICD Warning

People with a heart stimulator must maintain an absolute distance from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Caution required

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Shattering risk

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

This is not a toy

Strictly keep magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are life-threatening.

Allergic reactions

Some people experience a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact can result in skin redness. It is best to use protective gloves.

Flammability

Powder created during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Compass and GPS

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Hand protection

Protect your hands. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Permanent damage

Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. This process is irreversible.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?