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MP 20x8x5 / N38 - ring magnet

ring magnet

Catalog no 030188

GTIN/EAN: 5906301812050

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

9.9 g

Magnetization Direction

↑ axial

Load capacity

5.82 kg / 57.06 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

check properties »

3.80 ZŁ with VAT / pcs + price for transport

3.09 ZŁ net + 23% VAT / pcs

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Technical details - MP 20x8x5 / N38 - ring magnet

Specification / characteristics - MP 20x8x5 / N38 - ring magnet

properties
properties values
Cat. no. 030188
GTIN/EAN 5906301812050
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 8 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 9.9 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.82 kg / 57.06 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8x5 / 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 data are the outcome of a engineering simulation. Results are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - interaction chart
MP 20x8x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5917 Gs
591.7 mT
 5.82 kg / 12.83 pounds
5820.0 g / 57.1 N
 warning
1 mm 5321 Gs
532.1 mT
 4.71 kg / 10.38 pounds
4707.4 g / 46.2 N
 warning
2 mm 4736 Gs
473.6 mT
 3.73 kg / 8.22 pounds
3729.5 g / 36.6 N
 warning
3 mm 4184 Gs
418.4 mT
 2.91 kg / 6.42 pounds
2910.0 g / 28.5 N
 warning
5 mm 3216 Gs
321.6 mT
 1.72 kg / 3.79 pounds
1719.3 g / 16.9 N
 low risk
10 mm 1650 Gs
165.0 mT
 0.45 kg / 1.00 pounds
452.4 g / 4.4 N
 low risk
15 mm 907 Gs
90.7 mT
 0.14 kg / 0.30 pounds
136.8 g / 1.3 N
 low risk
20 mm 544 Gs
54.4 mT
 0.05 kg / 0.11 pounds
49.2 g / 0.5 N
 low risk
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.02 pounds
9.6 g / 0.1 N
 low risk
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 pounds
0.9 g / 0.0 N
 low risk
Pulling power drops significantly with every subsequent millimeter of distance. Remember that even a very thin break (e.g., dirt, varnish, dust) significantly reduces the pull force. Neodymiums operate strongest during direct contact; distance nullifies the force. Notice how rapidly the parameters fall, when the product does not touch tightly to the metal substrate. When planning the mounting, avoid redundant distances.

Table 2: Slippage force (wall)
MP 20x8x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.16 kg / 2.57 pounds
1164.0 g / 11.4 N
1 mm Stal (~0.2) 0.94 kg / 2.08 pounds
942.0 g / 9.2 N
2 mm Stal (~0.2) 0.75 kg / 1.64 pounds
746.0 g / 7.3 N
3 mm Stal (~0.2) 0.58 kg / 1.28 pounds
582.0 g / 5.7 N
5 mm Stal (~0.2) 0.34 kg / 0.76 pounds
344.0 g / 3.4 N
10 mm Stal (~0.2) 0.09 kg / 0.20 pounds
90.0 g / 0.9 N
15 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 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 presents the approximate weight limit needed to cause the slippage of the magnet down along a upright steel plate (considering standard friction). This value is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MP 20x8x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.75 kg / 3.85 pounds
1746.0 g / 17.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.16 kg / 2.57 pounds
1164.0 g / 11.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.58 kg / 1.28 pounds
582.0 g / 5.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.91 kg / 6.42 pounds
2910.0 g / 28.5 N
When mounting a element on a upright surface (e.g., a car body), it will only hold only approx. 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that holders slip faster than they detach. Planning a wall mount? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a much lighter load. Using a rubber coating can significantly raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MP 20x8x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.58 kg / 1.28 pounds
582.0 g / 5.7 N
1 mm
25%
 1.46 kg / 3.21 pounds
1455.0 g / 14.3 N
2 mm
50%
 2.91 kg / 6.42 pounds
2910.0 g / 28.5 N
3 mm
75%
 4.37 kg / 9.62 pounds
4365.0 g / 42.8 N
5 mm
100%
 5.82 kg / 12.83 pounds
5820.0 g / 57.1 N
10 mm
100%
 5.82 kg / 12.83 pounds
5820.0 g / 57.1 N
11 mm
100%
 5.82 kg / 12.83 pounds
5820.0 g / 57.1 N
12 mm
100%
 5.82 kg / 12.83 pounds
5820.0 g / 57.1 N
A thin metal plate is incapable of take in the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you require a sufficiently solid backing of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal stability (stability) - thermal limit
MP 20x8x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.82 kg / 12.83 pounds
5820.0 g / 57.1 N
 OK
40 °C -2.2% 5.69 kg / 12.55 pounds
5692.0 g / 55.8 N
 OK
60 °C -4.4% 5.56 kg / 12.27 pounds
5563.9 g / 54.6 N
 OK
80 °C -6.6% 5.44 kg / 11.98 pounds
5435.9 g / 53.3 N
100 °C -28.8% 4.14 kg / 9.14 pounds
4143.8 g / 40.7 N
Ordinary NdFeB products irreversibly lose power past the thermal threshold. Watch out for overheating – heat can permanently damage this product. With increasing heat, the neodymium's force temporarily decreases. Refrain from using this product near heat sources higher than its working range. Ignoring the limit will lead to destruction of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) risk losing magnetic properties sooner than long magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MP 20x8x5 / 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 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 action. Want to build a strong closure? Apply two magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the impact force is extreme. The repulsion force is a bit weaker than the attraction, but still impressive.
*Field value between like poles is approximately ~0 Gs at the midpoint between the magnets (due to field cancellation).
Important: Estimates refer to shear force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MP 20x8x5 / 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
Powerful magnet radiation is a real danger to IT equipment as well as pacemakers. These NdFeB products produce a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and housings. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MP 20x8x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 25.61 km/h
(7.11 m/s)
 0.25 J
30 mm 42.40 km/h
(11.78 m/s)
 0.69 J
50 mm 54.68 km/h
(15.19 m/s)
 1.14 J
100 mm 77.33 km/h
(21.48 m/s)
 2.28 J
NdFeB products are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or injury to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MP 20x8x5 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 20x8x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 116 Mx 161.2 µWb
Pc Coefficient 1.13 High (Stable)
Total magnetic flux emitted by the magnet pole. Key data for generator designers as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MP 20x8x5 / N38

Environment Effective steel pull Effect
Air (land) 5.82 kg Standard
Water (riverbed) 6.66 kg
(+0.84 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

*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) = 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.

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%
Sustainability
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: 030188-2026
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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. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. 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 20x8x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. Damage to the protective layer during assembly is the most common cause of rusting. If you must use it outside, paint it with anti-corrosion paint after mounting.
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. 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.
The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 5.82 kg, which translates to 57.06 N in newtons. The mounting hole diameter is precisely 8 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Strengths as well as weaknesses of neodymium magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (theoretically),
  • Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a shiny gold surface has better aesthetics,
  • Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the capacity to customize to unusual requirements,
  • Significant place in modern technologies – they are utilized in computer drives, electric drive systems, precision medical tools, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their force 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
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Limited ability of producing threads in the magnet and complex forms - preferred is cover - magnet mounting.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Highest magnetic holding force – what affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:
  • with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a surface cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • at standard ambient temperature

Magnet lifting force in use – key factors

In real-world applications, the real power depends on a number of factors, presented from most significant:
  • Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Caution required

Be careful. Rare earth magnets attract from a distance and snap with massive power, often faster than you can react.

Combustion hazard

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

Choking Hazard

Product intended for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.

Metal Allergy

It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact and opt for coated magnets.

Electronic devices

Do not bring magnets close to a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Pacemakers

Patients with a heart stimulator should keep an absolute distance from magnets. The magnetic field can disrupt the operation of the life-saving device.

Bodily injuries

Large magnets can smash fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Risk of cracking

NdFeB magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets will cause them shattering into small pieces.

Power loss in heat

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Keep away from electronics

A strong magnetic field disrupts the functioning of compasses in phones and GPS navigation. Keep magnets close to a device to avoid breaking the sensors.

Warning! Details about hazards in the article: Magnet Safety Guide.