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MP 20x10x5 / N38 - ring magnet

ring magnet

Catalog no 030184

GTIN/EAN: 5906301812012

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

8.84 g

Magnetization Direction

↑ axial

Load capacity

5.20 kg / 50.97 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

4.50 with VAT / pcs + price for transport

3.66 ZŁ net + 23% VAT / pcs

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Technical specification of the product - MP 20x10x5 / N38 - ring magnet

Specification / characteristics - MP 20x10x5 / N38 - ring magnet

properties
properties values
Cat. no. 030184
GTIN/EAN 5906301812012
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 20 mm [±0,1 mm]
internal diameter Ø 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 8.84 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.20 kg / 50.97 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x10x5 / N38 - ring 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 product - report

Presented information are the result of a mathematical calculation. Results rely on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MP 20x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5917 Gs
591.7 mT
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
medium risk
1 mm 5321 Gs
532.1 mT
4.21 kg / 9.27 pounds
4205.9 g / 41.3 N
medium risk
2 mm 4736 Gs
473.6 mT
3.33 kg / 7.35 pounds
3332.2 g / 32.7 N
medium risk
3 mm 4184 Gs
418.4 mT
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
medium risk
5 mm 3216 Gs
321.6 mT
1.54 kg / 3.39 pounds
1536.2 g / 15.1 N
safe
10 mm 1650 Gs
165.0 mT
0.40 kg / 0.89 pounds
404.2 g / 4.0 N
safe
15 mm 907 Gs
90.7 mT
0.12 kg / 0.27 pounds
122.3 g / 1.2 N
safe
20 mm 544 Gs
54.4 mT
0.04 kg / 0.10 pounds
44.0 g / 0.4 N
safe
30 mm 240 Gs
24.0 mT
0.01 kg / 0.02 pounds
8.5 g / 0.1 N
safe
50 mm 75 Gs
7.5 mT
0.00 kg / 0.00 pounds
0.8 g / 0.0 N
safe

Table 2: Vertical hold (wall)
MP 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.04 kg / 2.29 pounds
1040.0 g / 10.2 N
1 mm Stal (~0.2) 0.84 kg / 1.86 pounds
842.0 g / 8.3 N
2 mm Stal (~0.2) 0.67 kg / 1.47 pounds
666.0 g / 6.5 N
3 mm Stal (~0.2) 0.52 kg / 1.15 pounds
520.0 g / 5.1 N
5 mm Stal (~0.2) 0.31 kg / 0.68 pounds
308.0 g / 3.0 N
10 mm Stal (~0.2) 0.08 kg / 0.18 pounds
80.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MP 20x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.56 kg / 3.44 pounds
1560.0 g / 15.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.04 kg / 2.29 pounds
1040.0 g / 10.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.52 kg / 1.15 pounds
520.0 g / 5.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N

Table 4: Material efficiency (substrate influence) - power losses
MP 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.52 kg / 1.15 pounds
520.0 g / 5.1 N
1 mm
25%
1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
2 mm
50%
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
3 mm
75%
3.90 kg / 8.60 pounds
3900.0 g / 38.3 N
5 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
10 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
11 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
12 mm
100%
5.20 kg / 11.46 pounds
5200.0 g / 51.0 N

Table 5: Thermal stability (stability) - resistance threshold
MP 20x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
OK
40 °C -2.2% 5.09 kg / 11.21 pounds
5085.6 g / 49.9 N
OK
60 °C -4.4% 4.97 kg / 10.96 pounds
4971.2 g / 48.8 N
OK
80 °C -6.6% 4.86 kg / 10.71 pounds
4856.8 g / 47.6 N
100 °C -28.8% 3.70 kg / 8.16 pounds
3702.4 g / 36.3 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.03 kg / 119.11 pounds
6 121 Gs
8.10 kg / 17.87 pounds
8104 g / 79.5 N
N/A
1 mm 48.76 kg / 107.50 pounds
11 242 Gs
7.31 kg / 16.13 pounds
7314 g / 71.8 N
43.89 kg / 96.75 pounds
~0 Gs
2 mm 43.70 kg / 96.34 pounds
10 642 Gs
6.55 kg / 14.45 pounds
6555 g / 64.3 N
39.33 kg / 86.71 pounds
~0 Gs
3 mm 38.98 kg / 85.94 pounds
10 051 Gs
5.85 kg / 12.89 pounds
5847 g / 57.4 N
35.08 kg / 77.34 pounds
~0 Gs
5 mm 30.63 kg / 67.54 pounds
8 910 Gs
4.60 kg / 10.13 pounds
4595 g / 45.1 N
27.57 kg / 60.78 pounds
~0 Gs
10 mm 15.96 kg / 35.19 pounds
6 432 Gs
2.39 kg / 5.28 pounds
2394 g / 23.5 N
14.36 kg / 31.67 pounds
~0 Gs
20 mm 4.20 kg / 9.26 pounds
3 299 Gs
0.63 kg / 1.39 pounds
630 g / 6.2 N
3.78 kg / 8.33 pounds
~0 Gs
50 mm 0.19 kg / 0.42 pounds
702 Gs
0.03 kg / 0.06 pounds
29 g / 0.3 N
0.17 kg / 0.38 pounds
~0 Gs
60 mm 0.09 kg / 0.20 pounds
480 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.18 pounds
~0 Gs
70 mm 0.05 kg / 0.10 pounds
342 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
253 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
193 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.03 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
150 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 20x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.5 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Mechanical watch 20 Gs (2.0 mT) 9.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Dynamics (kinetic energy) - warning
MP 20x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.62 km/h
(7.12 m/s)
0.22 J
30 mm 42.41 km/h
(11.78 m/s)
0.61 J
50 mm 54.70 km/h
(15.19 m/s)
1.02 J
100 mm 77.35 km/h
(21.49 m/s)
2.04 J

Table 9: Surface protection spec
MP 20x10x5 / 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 (Flux)
MP 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 116 Mx 161.2 µWb
Pc Coefficient 1.13 High (Stable)

Table 11: Hydrostatics and buoyancy
MP 20x10x5 / N38

Environment Effective steel pull Effect
Air (land) 5.20 kg Standard
Water (riverbed) 5.95 kg
(+0.75 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!
1. Shear force

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

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Heat tolerance

*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) = 1.13

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.

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%
Environmental data
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: 030184-2026
Quick Unit Converter
Magnet pull force

Magnetic Field

Other products

It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 20x10x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 5.20 kg (force ~50.97 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 10 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
  • In other words, due to the glossy layer of silver, the element gains visual value,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the ability of free forming and adaptation to unique solutions, magnetic components can be created in a broad palette of forms and dimensions, which amplifies use scope,
  • Wide application in high-tech industry – they are used in hard drives, electric drive systems, precision medical tools, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets and ways of using them
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of making nuts in the magnet and complicated forms - preferred is a housing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these products can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Holding force of 5.20 kg is a result of laboratory testing conducted under specific, ideal conditions:
  • using a plate made of mild steel, acting as a ideal flux conductor
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with a plane free of scratches
  • without the slightest insulating layer between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Key elements affecting lifting force

During everyday use, the actual holding force results from several key aspects, presented from the most important:
  • Gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel does not accept the full field, causing part of the power to be wasted into the air.
  • Plate material – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Warnings
Keep away from children

Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.

Magnets are brittle

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Safe operation

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

ICD Warning

People with a ICD have to maintain an absolute distance from magnets. The magnetism can stop the functioning of the life-saving device.

Crushing risk

Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Phone sensors

GPS units and mobile phones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Metal Allergy

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

Threat to electronics

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Dust is flammable

Machining of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Demagnetization risk

Control the heat. Heating the magnet to high heat will destroy its properties and strength.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?