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MW 70x50 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010496

GTIN/EAN: 5906301811145

Load capacity 168.21 kg / 1650.14 N Magnetic Induction 507.83 mT / 5078 Gs
Diameter Ø
70 mm [±0,1 mm]
Height
50 mm [±0,1 mm]
Weight
1443.17 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

420.00net / pcs

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Net
Gross
price from 1 pcs
420.00 zł
516.60 zł
price from 5 pcs
394.80 zł
485.60 zł
price from 10 pcs
369.60 zł
454.61 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.

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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.

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Technical - MW 70x50 / N38 - cylindrical magnet

Specification / characteristics - MW 70x50 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010496
GTIN/EAN 5906301811145
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 70 mm [±0,1 mm]
Height 50 mm [±0,1 mm]
Weight 1443.17 g
Magnetization Direction ↑ axial
Load capacity ~ ? 168.21 kg / 1650.14 N
Magnetic Induction ~ ? 507.83 mT / 5078 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 70x50 / 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

Technical modeling of the magnet - data

These information represent the result of a physical simulation. Results were calculated on models for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
MW 70x50 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5078 Gs
507.8 mT
168.21 kg / 370.84 LBS
168210.0 g / 1650.1 N
crushing
1 mm 4935 Gs
493.5 mT
158.88 kg / 350.26 LBS
158876.4 g / 1558.6 N
crushing
2 mm 4790 Gs
479.0 mT
149.67 kg / 329.96 LBS
149666.1 g / 1468.2 N
crushing
3 mm 4644 Gs
464.4 mT
140.71 kg / 310.21 LBS
140708.8 g / 1380.4 N
crushing
5 mm 4354 Gs
435.4 mT
123.67 kg / 272.64 LBS
123667.4 g / 1213.2 N
crushing
10 mm 3652 Gs
365.2 mT
87.02 kg / 191.84 LBS
87016.1 g / 853.6 N
crushing
15 mm 3017 Gs
301.7 mT
59.37 kg / 130.88 LBS
59366.6 g / 582.4 N
crushing
20 mm 2469 Gs
246.9 mT
39.78 kg / 87.70 LBS
39781.3 g / 390.3 N
crushing
30 mm 1645 Gs
164.5 mT
17.66 kg / 38.93 LBS
17659.3 g / 173.2 N
crushing
50 mm 773 Gs
77.3 mT
3.89 kg / 8.59 LBS
3895.0 g / 38.2 N
medium risk

Table 2: Shear force (wall)
MW 70x50 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 33.64 kg / 74.17 LBS
33642.0 g / 330.0 N
1 mm Stal (~0.2) 31.78 kg / 70.05 LBS
31776.0 g / 311.7 N
2 mm Stal (~0.2) 29.93 kg / 65.99 LBS
29934.0 g / 293.7 N
3 mm Stal (~0.2) 28.14 kg / 62.04 LBS
28142.0 g / 276.1 N
5 mm Stal (~0.2) 24.73 kg / 54.53 LBS
24734.0 g / 242.6 N
10 mm Stal (~0.2) 17.40 kg / 38.37 LBS
17404.0 g / 170.7 N
15 mm Stal (~0.2) 11.87 kg / 26.18 LBS
11874.0 g / 116.5 N
20 mm Stal (~0.2) 7.96 kg / 17.54 LBS
7956.0 g / 78.0 N
30 mm Stal (~0.2) 3.53 kg / 7.79 LBS
3532.0 g / 34.6 N
50 mm Stal (~0.2) 0.78 kg / 1.72 LBS
778.0 g / 7.6 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 70x50 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
50.46 kg / 111.25 LBS
50463.0 g / 495.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
33.64 kg / 74.17 LBS
33642.0 g / 330.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
16.82 kg / 37.08 LBS
16821.0 g / 165.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
84.11 kg / 185.42 LBS
84105.0 g / 825.1 N

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 70x50 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
5.61 kg / 12.36 LBS
5607.0 g / 55.0 N
1 mm
8%
14.02 kg / 30.90 LBS
14017.5 g / 137.5 N
2 mm
17%
28.03 kg / 61.81 LBS
28035.0 g / 275.0 N
3 mm
25%
42.05 kg / 92.71 LBS
42052.5 g / 412.5 N
5 mm
42%
70.09 kg / 154.52 LBS
70087.5 g / 687.6 N
10 mm
83%
140.18 kg / 309.03 LBS
140175.0 g / 1375.1 N
11 mm
92%
154.19 kg / 339.94 LBS
154192.5 g / 1512.6 N
12 mm
100%
168.21 kg / 370.84 LBS
168210.0 g / 1650.1 N

Table 5: Thermal resistance (material behavior) - power drop
MW 70x50 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 168.21 kg / 370.84 LBS
168210.0 g / 1650.1 N
OK
40 °C -2.2% 164.51 kg / 362.68 LBS
164509.4 g / 1613.8 N
OK
60 °C -4.4% 160.81 kg / 354.52 LBS
160808.8 g / 1577.5 N
OK
80 °C -6.6% 157.11 kg / 346.36 LBS
157108.1 g / 1541.2 N
100 °C -28.8% 119.77 kg / 264.04 LBS
119765.5 g / 1174.9 N

Table 6: Two magnets (attraction) - field collision
MW 70x50 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 611.75 kg / 1348.67 LBS
5 850 Gs
91.76 kg / 202.30 LBS
91762 g / 900.2 N
N/A
1 mm 594.86 kg / 1311.43 LBS
10 014 Gs
89.23 kg / 196.72 LBS
89229 g / 875.3 N
535.37 kg / 1180.29 LBS
~0 Gs
2 mm 577.80 kg / 1273.84 LBS
9 870 Gs
86.67 kg / 191.08 LBS
86670 g / 850.2 N
520.02 kg / 1146.45 LBS
~0 Gs
3 mm 560.95 kg / 1236.68 LBS
9 725 Gs
84.14 kg / 185.50 LBS
84142 g / 825.4 N
504.85 kg / 1113.01 LBS
~0 Gs
5 mm 527.90 kg / 1163.81 LBS
9 434 Gs
79.18 kg / 174.57 LBS
79184 g / 776.8 N
475.11 kg / 1047.43 LBS
~0 Gs
10 mm 449.75 kg / 991.54 LBS
8 708 Gs
67.46 kg / 148.73 LBS
67463 g / 661.8 N
404.78 kg / 892.38 LBS
~0 Gs
20 mm 316.46 kg / 697.68 LBS
7 304 Gs
47.47 kg / 104.65 LBS
47469 g / 465.7 N
284.81 kg / 627.91 LBS
~0 Gs
50 mm 96.30 kg / 212.30 LBS
4 029 Gs
14.44 kg / 31.85 LBS
14445 g / 141.7 N
86.67 kg / 191.07 LBS
~0 Gs
60 mm 64.22 kg / 141.59 LBS
3 291 Gs
9.63 kg / 21.24 LBS
9634 g / 94.5 N
57.80 kg / 127.43 LBS
~0 Gs
70 mm 43.17 kg / 95.18 LBS
2 698 Gs
6.48 kg / 14.28 LBS
6476 g / 63.5 N
38.86 kg / 85.66 LBS
~0 Gs
80 mm 29.36 kg / 64.73 LBS
2 225 Gs
4.40 kg / 9.71 LBS
4404 g / 43.2 N
26.43 kg / 58.26 LBS
~0 Gs
90 mm 20.25 kg / 44.63 LBS
1 847 Gs
3.04 kg / 6.69 LBS
3037 g / 29.8 N
18.22 kg / 40.17 LBS
~0 Gs
100 mm 14.17 kg / 31.23 LBS
1 545 Gs
2.12 kg / 4.68 LBS
2125 g / 20.8 N
12.75 kg / 28.11 LBS
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MW 70x50 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 40.0 cm
Hearing aid 10 Gs (1.0 mT) 31.5 cm
Mechanical watch 20 Gs (2.0 mT) 24.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 19.0 cm
Car key 50 Gs (5.0 mT) 17.5 cm
Payment card 400 Gs (40.0 mT) 7.5 cm
HDD hard drive 600 Gs (60.0 mT) 6.0 cm

Table 8: Impact energy (cracking risk) - warning
MW 70x50 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 14.84 km/h
(4.12 m/s)
12.26 J
30 mm 19.37 km/h
(5.38 m/s)
20.89 J
50 mm 20.17 km/h
(5.60 m/s)
22.65 J
100 mm 20.42 km/h
(5.67 m/s)
23.23 J

Table 9: Anti-corrosion coating durability
MW 70x50 / 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 (Flux)
MW 70x50 / N38

Parameter Value SI Unit / Description
Magnetic Flux 197 145 Mx 1971.5 µWb
Pc Coefficient 0.74 High (Stable)

Table 11: Physics of underwater searching
MW 70x50 / N38

Environment Effective steel pull Effect
Air (land) 168.21 kg Standard
Water (riverbed) 192.60 kg
(+24.39 kg buoyancy gain)
+14.5%
Rust risk: 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

*Note: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.74

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

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: 010496-2026
Measurement Calculator

Magnet pull force


Magnetic Induction

Other products

The offered product is an incredibly powerful cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø70x50 mm, guarantees optimal power. This specific item features a tolerance of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 168.21 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 1650.14 N with a weight of only 1443.17 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in automation, 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 frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø70x50), 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 70 mm and height 50 mm. The value of 1650.14 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1443.17 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 50 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 through the diameter if your project requires it.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • They possess excellent resistance to magnetic field loss as a result of external fields,
  • Thanks to the shiny finish, the layer of nickel, gold-plated, or silver-plated gives an elegant appearance,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in designing and the ability to customize to individual projects,
  • Versatile presence in high-tech industry – they serve a role in HDD drives, motor assemblies, precision medical tools, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Limitations

Cons of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic mount.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

The load parameter shown represents the maximum value, recorded under optimal environment, meaning:
  • using a plate made of high-permeability steel, serving as a ideal flux conductor
  • with a thickness no less than 10 mm
  • characterized by even structure
  • without the slightest clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at standard ambient temperature

Key elements affecting lifting force

It is worth knowing that the working load will differ subject to elements below, in order of importance:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be lost to the other side.
  • Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Warnings
Safe operation

Handle with care. Rare earth magnets attract from a distance and connect with huge force, often faster than you can react.

Implant safety

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

Hand protection

Watch your fingers. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Cards and drives

Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Mechanical processing

Powder created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Warning for allergy sufferers

Certain individuals experience a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause a rash. We strongly advise use safety gloves.

Product not for children

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

Maximum temperature

Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and strength.

Precision electronics

An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Keep magnets near a device to prevent breaking the sensors.

Magnets are brittle

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Attention! More info about hazards in the article: Magnet Safety Guide.