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MP 20x5x5 / N38 - ring magnet

ring magnet

Catalog no 030186

GTIN/EAN: 5906301812036

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.04 g

Magnetization Direction

↑ axial

Load capacity

6.49 kg / 63.68 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

view parameters »

2.76 ZŁ with VAT / pcs + price for transport

2.24 ZŁ net + 23% VAT / pcs

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Technical data - MP 20x5x5 / N38 - ring magnet

Specification / characteristics - MP 20x5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030186
GTIN/EAN 5906301812036
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 5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.04 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.49 kg / 63.68 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x5x5 / 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

Physical analysis of the magnet - technical parameters

These values constitute the result of a physical analysis. Results rely on models for the class Nd2Fe14B. Real-world performance may deviate from the simulation results. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
MP 20x5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5917 Gs
591.7 mT
 6.49 kg / 14.31 pounds
6490.0 g / 63.7 N
 strong
1 mm 5321 Gs
532.1 mT
 5.25 kg / 11.57 pounds
5249.3 g / 51.5 N
 strong
2 mm 4736 Gs
473.6 mT
 4.16 kg / 9.17 pounds
4158.8 g / 40.8 N
 strong
3 mm 4184 Gs
418.4 mT
 3.25 kg / 7.15 pounds
3245.0 g / 31.8 N
 strong
5 mm 3216 Gs
321.6 mT
 1.92 kg / 4.23 pounds
1917.2 g / 18.8 N
 low risk
10 mm 1650 Gs
165.0 mT
 0.50 kg / 1.11 pounds
504.5 g / 4.9 N
 low risk
15 mm 907 Gs
90.7 mT
 0.15 kg / 0.34 pounds
152.6 g / 1.5 N
 low risk
20 mm 544 Gs
54.4 mT
 0.05 kg / 0.12 pounds
54.9 g / 0.5 N
 low risk
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.02 pounds
10.7 g / 0.1 N
 low risk
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 pounds
1.0 g / 0.0 N
 low risk
Pulling power decreases significantly per each millimeter of distance. Remember that every additional insulation layer (e.g., dirt, paint, veneer) noticeably reduces the pull force. Neodymiums operate most effectively during direct contact; air break drastically cuts the force. See how quickly the parameters plummet, when the product does not adhere directly to the steel surface. When planning the arrangement, eliminate redundant distances.

Table 2: Sliding hold (wall)
MP 20x5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.30 kg / 2.86 pounds
1298.0 g / 12.7 N
1 mm Stal (~0.2) 1.05 kg / 2.31 pounds
1050.0 g / 10.3 N
2 mm Stal (~0.2) 0.83 kg / 1.83 pounds
832.0 g / 8.2 N
3 mm Stal (~0.2) 0.65 kg / 1.43 pounds
650.0 g / 6.4 N
5 mm Stal (~0.2) 0.38 kg / 0.85 pounds
384.0 g / 3.8 N
10 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
15 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 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
The following data indicates the approximate holding capacity necessary to initiate the sliding of the magnet vertically on a vertical steel wall (assuming standard friction coefficient). The holding force is a function of the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MP 20x5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.95 kg / 4.29 pounds
1947.0 g / 19.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.30 kg / 2.86 pounds
1298.0 g / 12.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.65 kg / 1.43 pounds
649.0 g / 6.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.25 kg / 7.15 pounds
3245.0 g / 31.8 N
When placing a magnet on a upright wall (e.g., a board), it you can count on barely approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip mean that products slip easier than they pop off the substrate. Want to create a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will slide down under a much lighter cargo. Using a rubber layer can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 20x5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.65 kg / 1.43 pounds
649.0 g / 6.4 N
1 mm
25%
 1.62 kg / 3.58 pounds
1622.5 g / 15.9 N
2 mm
50%
 3.25 kg / 7.15 pounds
3245.0 g / 31.8 N
3 mm
75%
 4.87 kg / 10.73 pounds
4867.5 g / 47.8 N
5 mm
100%
 6.49 kg / 14.31 pounds
6490.0 g / 63.7 N
10 mm
100%
 6.49 kg / 14.31 pounds
6490.0 g / 63.7 N
11 mm
100%
 6.49 kg / 14.31 pounds
6490.0 g / 63.7 N
12 mm
100%
 6.49 kg / 14.31 pounds
6490.0 g / 63.7 N
A too thin steel cannot absorb the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a thin surface, the magnetism will penetrate right through and the holding will be smaller. To utilize full efficiency of this magnet's power, you need a suitably thick backing of metal. The saturation phenomenon means that on thin elements (e.g., car bodies), the product holds weaker. We advise picking the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
MP 20x5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.49 kg / 14.31 pounds
6490.0 g / 63.7 N
 OK
40 °C -2.2% 6.35 kg / 13.99 pounds
6347.2 g / 62.3 N
 OK
60 °C -4.4% 6.20 kg / 13.68 pounds
6204.4 g / 60.9 N
 OK
80 °C -6.6% 6.06 kg / 13.36 pounds
6061.7 g / 59.5 N
100 °C -28.8% 4.62 kg / 10.19 pounds
4620.9 g / 45.3 N
Standard neodymium magnets change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently damage this magnet. With increasing heat, the magnet's capacity temporarily decreases. Avoid using this product close to ovens exceeding its safe range. Too high temperature will cause permanent loss of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MP 20x5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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
Two magnets attract each other from a wider radius than a neodymium and metal setup. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Want to build a strong closure? Apply two magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is extreme. The repulsion force is a bit weaker than the connection force, but still significant.
*Flux density for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Calculations demonstrate shear force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 20x5x5 / 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
Remote 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
Extremely neodym field is a real danger to IT equipment as well as pacemakers. These NdFeB products produce a flux that disrupts operation of digital equipment. Notice: the unseen radiation passes through tissues and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MP 20x5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.61 km/h
(7.11 m/s)
 0.28 J
30 mm 42.40 km/h
(11.78 m/s)
 0.77 J
50 mm 54.68 km/h
(15.19 m/s)
 1.27 J
100 mm 77.33 km/h
(21.48 m/s)
 2.55 J
NdFeB products are very brittle – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely becomes dangerous. Impact energy can destroy the magnet or injury to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the magnet. Use safety goggles when playing with large magnets.

Table 9: Surface protection spec
MP 20x5x5 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MP 20x5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 116 Mx 161.2 µWb
Pc Coefficient 1.13 High (Stable)
Total magnetic flux passing through the pole surface. Key data for generator designers and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 20x5x5 / N38

Environment Effective steel pull Effect
Air (land) 6.49 kg Standard
Water (riverbed) 7.43 kg
(+0.94 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.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains only a fraction of its nominal pull.

2. Steel saturation

*Thin steel (e.g. computer case) severely reduces 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) = 1.13

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
Material specification
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: 030186-2026
Measurement Calculator
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Magnetic Induction
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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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 5 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (20 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 20 mm and thickness 5 mm. The pulling force of this model is an impressive 6.49 kg, which translates to 63.68 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 5 mm.
The poles are located on the planes with holes, not on the sides of the ring. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose strength, even during around 10 years – the reduction in strength is only ~1% (based on measurements),
  • Magnets very well resist against loss of magnetization caused by foreign field sources,
  • Thanks to the shimmering finish, the coating of nickel, gold-plated, or silver gives an visually attractive appearance,
  • Magnetic induction on the working part of the magnet turns out to be exceptional,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in shaping and the capacity to adapt to client solutions,
  • Fundamental importance in electronics industry – they are utilized in mass storage devices, electric motors, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in small systems

Cons

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complicated shapes in magnets, we propose using a housing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

The declared magnet strength refers to the peak performance, measured under ideal test conditions, namely:
  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a plane cleaned and smooth
  • with total lack of distance (no coatings)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Magnet lifting force in use – key factors

Effective lifting capacity is influenced by working environment parameters, mainly (from most important):
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Base massiveness – too thin plate does not close the flux, causing part of the flux to be escaped into the air.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the lifting capacity.

Warnings
Health Danger

Patients with a heart stimulator must maintain an safe separation from magnets. The magnetic field can interfere with the operation of the life-saving device.

Keep away from children

Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Keep away from kids and pets.

Allergic reactions

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease handling magnets and use protective gear.

Protect data

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can destroy these devices and erase data from cards.

Do not overheat magnets

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Material brittleness

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Compass and GPS

Navigation devices and smartphones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Do not underestimate power

Handle magnets consciously. Their immense force can shock even experienced users. Be vigilant and respect their power.

Dust explosion hazard

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Hand protection

Big blocks can smash fingers instantly. Never place your hand between two attracting surfaces.

Security! Details about hazards in the article: Safety of working with magnets.