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MW 45x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010070

GTIN/EAN: 5906301810698

5.00

Diameter Ø

45 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

178.92 g

Magnetization Direction

↑ axial

Load capacity

48.55 kg / 476.32 N

Magnetic Induction

343.84 mT / 3438 Gs

Coating

[NiCuNi] Nickel

check properties »

61.84 ZŁ with VAT / pcs + price for transport

50.28 ZŁ net + 23% VAT / pcs

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Technical parameters - MW 45x15 / N38 - cylindrical magnet

Specification / characteristics - MW 45x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010070
GTIN/EAN 5906301810698
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 45 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 178.92 g
Magnetization Direction ↑ axial
Load capacity ~ ? 48.55 kg / 476.32 N
Magnetic Induction ~ ? 343.84 mT / 3438 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x15 / 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

These values are the direct effect of a engineering analysis. Values were calculated on models for the material Nd2Fe14B. Real-world conditions might slightly differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - interaction chart
MW 45x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3438 Gs
343.8 mT
 48.55 kg / 107.03 LBS
48550.0 g / 476.3 N
 critical level
1 mm 3318 Gs
331.8 mT
 45.21 kg / 99.68 LBS
45214.3 g / 443.6 N
 critical level
2 mm 3189 Gs
318.9 mT
 41.76 kg / 92.07 LBS
41762.8 g / 409.7 N
 critical level
3 mm 3054 Gs
305.4 mT
 38.30 kg / 84.44 LBS
38303.2 g / 375.8 N
 critical level
5 mm 2774 Gs
277.4 mT
 31.61 kg / 69.69 LBS
31610.0 g / 310.1 N
 critical level
10 mm 2090 Gs
209.0 mT
 17.95 kg / 39.57 LBS
17948.5 g / 176.1 N
 critical level
15 mm 1521 Gs
152.1 mT
 9.50 kg / 20.95 LBS
9500.8 g / 93.2 N
 strong
20 mm 1096 Gs
109.6 mT
 4.94 kg / 10.88 LBS
4936.3 g / 48.4 N
 strong
30 mm 585 Gs
58.5 mT
 1.41 kg / 3.10 LBS
1407.9 g / 13.8 N
 low risk
50 mm 205 Gs
20.5 mT
 0.17 kg / 0.38 LBS
172.6 g / 1.7 N
 low risk
Magnetic force decreases significantly per each millimeter of gap. Remember that every additional insulation layer (e.g., contamination, paint, dust) noticeably diminishes the holding power. Neodymiums work most effectively during direct contact; air break weakens the force. Observe how quickly the parameters plummet, when the product does not adhere directly to the metal substrate. When designing the arrangement, discard additional spacers.

Table 2: Slippage hold (vertical surface)
MW 45x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 9.71 kg / 21.41 LBS
9710.0 g / 95.3 N
1 mm Stal (~0.2) 9.04 kg / 19.93 LBS
9042.0 g / 88.7 N
2 mm Stal (~0.2) 8.35 kg / 18.41 LBS
8352.0 g / 81.9 N
3 mm Stal (~0.2) 7.66 kg / 16.89 LBS
7660.0 g / 75.1 N
5 mm Stal (~0.2) 6.32 kg / 13.94 LBS
6322.0 g / 62.0 N
10 mm Stal (~0.2) 3.59 kg / 7.91 LBS
3590.0 g / 35.2 N
15 mm Stal (~0.2) 1.90 kg / 4.19 LBS
1900.0 g / 18.6 N
20 mm Stal (~0.2) 0.99 kg / 2.18 LBS
988.0 g / 9.7 N
30 mm Stal (~0.2) 0.28 kg / 0.62 LBS
282.0 g / 2.8 N
50 mm Stal (~0.2) 0.03 kg / 0.07 LBS
34.0 g / 0.3 N
The table below calculates the approximate weight limit necessary to start the sliding of the magnet vertically against a upright steel wall (assuming typical friction coefficient). This parameter is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 45x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
14.56 kg / 32.11 LBS
14565.0 g / 142.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
9.71 kg / 21.41 LBS
9710.0 g / 95.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.86 kg / 10.70 LBS
4855.0 g / 47.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
24.28 kg / 53.52 LBS
24275.0 g / 238.1 N
When placing a element on a vertical plane (e.g., a car body), it will only hold only about 1/5 of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that products slip faster than they pull off. Planning a wall mount? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a noticeably lighter load. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 45x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 2.43 kg / 5.35 LBS
2427.5 g / 23.8 N
1 mm
13%
 6.07 kg / 13.38 LBS
6068.8 g / 59.5 N
2 mm
25%
 12.14 kg / 26.76 LBS
12137.5 g / 119.1 N
3 mm
38%
 18.21 kg / 40.14 LBS
18206.2 g / 178.6 N
5 mm
63%
 30.34 kg / 66.90 LBS
30343.8 g / 297.7 N
10 mm
100%
 48.55 kg / 107.03 LBS
48550.0 g / 476.3 N
11 mm
100%
 48.55 kg / 107.03 LBS
48550.0 g / 476.3 N
12 mm
100%
 48.55 kg / 107.03 LBS
48550.0 g / 476.3 N
A too thin steel is unable to focus the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the field will pass right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon means that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - power drop
MW 45x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 48.55 kg / 107.03 LBS
48550.0 g / 476.3 N
 OK
40 °C -2.2% 47.48 kg / 104.68 LBS
47481.9 g / 465.8 N
 OK
60 °C -4.4% 46.41 kg / 102.32 LBS
46413.8 g / 455.3 N
80 °C -6.6% 45.35 kg / 99.97 LBS
45345.7 g / 444.8 N
100 °C -28.8% 34.57 kg / 76.21 LBS
34567.6 g / 339.1 N
Standard neodymium magnets lose power past the thermal threshold. Avoid high temperatures – heat can irreversibly demagnetize this magnet. As the temperature rises, the magnet's force momentarily drops. Do not use this magnet close to ovens higher than its operating temperature limit. Ignoring the limit will result in permanent loss of magnetism.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) may lose charge permanently sooner compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 45x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 115.89 kg / 255.50 LBS
4 958 Gs
17.38 kg / 38.32 LBS
17384 g / 170.5 N
 N/A
1 mm 111.99 kg / 246.89 LBS
6 759 Gs
16.80 kg / 37.03 LBS
16798 g / 164.8 N
 100.79 kg / 222.20 LBS
~0 Gs
2 mm 107.93 kg / 237.94 LBS
6 636 Gs
16.19 kg / 35.69 LBS
16189 g / 158.8 N
 97.14 kg / 214.15 LBS
~0 Gs
3 mm 103.82 kg / 228.89 LBS
6 508 Gs
15.57 kg / 34.33 LBS
15573 g / 152.8 N
 93.44 kg / 206.00 LBS
~0 Gs
5 mm 95.55 kg / 210.66 LBS
6 244 Gs
14.33 kg / 31.60 LBS
14333 g / 140.6 N
 86.00 kg / 189.59 LBS
~0 Gs
10 mm 75.46 kg / 166.35 LBS
5 548 Gs
11.32 kg / 24.95 LBS
11318 g / 111.0 N
 67.91 kg / 149.72 LBS
~0 Gs
20 mm 42.84 kg / 94.46 LBS
4 181 Gs
6.43 kg / 14.17 LBS
6427 g / 63.0 N
 38.56 kg / 85.01 LBS
~0 Gs
50 mm 6.20 kg / 13.67 LBS
1 591 Gs
0.93 kg / 2.05 LBS
930 g / 9.1 N
 5.58 kg / 12.31 LBS
~0 Gs
60 mm 3.36 kg / 7.41 LBS
1 171 Gs
0.50 kg / 1.11 LBS
504 g / 4.9 N
 3.02 kg / 6.67 LBS
~0 Gs
70 mm 1.89 kg / 4.16 LBS
877 Gs
0.28 kg / 0.62 LBS
283 g / 2.8 N
 1.70 kg / 3.74 LBS
~0 Gs
80 mm 1.10 kg / 2.42 LBS
669 Gs
0.16 kg / 0.36 LBS
165 g / 1.6 N
 0.99 kg / 2.18 LBS
~0 Gs
90 mm 0.66 kg / 1.46 LBS
520 Gs
0.10 kg / 0.22 LBS
99 g / 1.0 N
 0.60 kg / 1.31 LBS
~0 Gs
100 mm 0.41 kg / 0.91 LBS
410 Gs
0.06 kg / 0.14 LBS
62 g / 0.6 N
 0.37 kg / 0.82 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and sheet combination. The setup of magnet-to-magnet generates a stronger field and a larger range of performance. Designing a powerful holder? Apply two magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is slightly lower than the connection force, but still large.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Figures show shear force of dual matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
MW 45x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 20.5 cm
Hearing aid 10 Gs (1.0 mT) 16.0 cm
Timepiece 20 Gs (2.0 mT) 12.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 10.0 cm
Remote 50 Gs (5.0 mT) 9.0 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Extremely neodym field poses a real danger to electronic devices and medical implants. These neodymiums produce a field that disrupts operation of sensitive medical devices. Notice: the unseen radiation passes through tissues and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 45x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.09 km/h
(5.58 m/s)
 2.79 J
30 mm 29.29 km/h
(8.14 m/s)
 5.92 J
50 mm 37.23 km/h
(10.34 m/s)
 9.57 J
100 mm 52.54 km/h
(14.59 m/s)
 19.05 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Striking energy can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the magnet. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
MW 45x15 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 45x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 57 854 Mx 578.5 µWb
Pc Coefficient 0.44 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 45x15 / N38

Environment Effective steel pull Effect
Air (land) 48.55 kg Standard
Water (riverbed) 55.59 kg
(+7.04 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!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Shear force

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

2. Plate thickness effect

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

3. Power loss vs temp

*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) = 0.44

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: 010070-2026
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The offered product is an incredibly powerful rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø45x15 mm, guarantees optimal power. This specific item features a tolerance of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 48.55 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 476.32 N with a weight of only 178.92 g, this cylindrical magnet is indispensable in miniature devices 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., 45.1 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 high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø45x15), 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 45 mm and height 15 mm. The value of 476.32 N means that the magnet is capable of holding a weight many times exceeding its own mass of 178.92 g. 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 15 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • Their magnetic field remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
  • Magnets effectively protect themselves against demagnetization caused by external fields,
  • Thanks to the reflective finish, the plating of nickel, gold, or silver-plated gives an modern appearance,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact modeling as well as optimizing to defined applications,
  • Universal use in advanced technology sectors – they are used in magnetic memories, electric motors, medical equipment, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Disadvantages

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong 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 suffer 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
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using cover - magnetic holder.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

The specified lifting capacity concerns the maximum value, measured under optimal environment, specifically:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • with a thickness minimum 10 mm
  • with a surface perfectly flat
  • without any air gap between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at temperature room level

What influences lifting capacity in practice

In practice, the real power results from many variables, ranked from crucial:
  • Clearance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost to the other side.
  • Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the holding force.

H&S for magnets
Heat sensitivity

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.

Precision electronics

Be aware: rare earth magnets produce a field that interferes with precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Keep away from children

Strictly store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.

Magnetic media

Do not bring magnets close to a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Do not underestimate power

Handle with care. Neodymium magnets act from a long distance and snap with huge force, often faster than you can move away.

Nickel allergy

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness appears, cease working with magnets and use protective gear.

Material brittleness

Protect your eyes. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.

Fire risk

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

ICD Warning

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Bone fractures

Big blocks can crush fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Safety First! Want to know more? Read our article: Why are neodymium magnets dangerous?