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MP 20x5x27 / N38 - ring magnet

ring magnet

Catalog no 030185

GTIN/EAN: 5906301812029

5.00
Load capacity 10.36 kg / 101.60 N Magnetic Induction 581.04 mT / 5810 Gs
Diameter
20 mm [±0,1 mm]
internal diameter Ø
5 mm [±0,1 mm]
Height
27 mm [±0,1 mm]
Weight
59.64 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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33.00 zł with VAT / pcs + price for transport

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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.

PDF report Calculator
Want to talk magnets?

Contact us by phone +48 22 499 98 98 or send us a note via inquiry form our website.
Specifications as well as shape of a neodymium magnet can be calculated on our force calculator.

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Technical - MP 20x5x27 / N38 - ring magnet

Specification / characteristics - MP 20x5x27 / N38 - ring magnet

properties
properties values
Cat. no. 030185
GTIN/EAN 5906301812029
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 27 mm [±0,1 mm]
Weight 59.64 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.36 kg / 101.60 N
Magnetic Induction ~ ? 581.04 mT / 5810 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x5x27 / 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

Technical analysis of the product - technical parameters

The following values represent the result of a physical simulation. Results are based on models for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs gap) - power drop
MP 20x5x27 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5716 Gs
571.6 mT
 10.36 kg / 22.84 lbs
10360.0 g / 101.6 N
 crushing
1 mm 5288 Gs
528.8 mT
 8.87 kg / 19.55 lbs
8865.5 g / 87.0 N
 strong
2 mm 4861 Gs
486.1 mT
 7.49 kg / 16.51 lbs
7491.0 g / 73.5 N
 strong
3 mm 4446 Gs
444.6 mT
 6.27 kg / 13.82 lbs
6267.5 g / 61.5 N
 strong
5 mm 3677 Gs
367.7 mT
 4.29 kg / 9.45 lbs
4285.9 g / 42.0 N
 strong
10 mm 2216 Gs
221.6 mT
 1.56 kg / 3.43 lbs
1557.1 g / 15.3 N
 safe
15 mm 1354 Gs
135.4 mT
 0.58 kg / 1.28 lbs
580.9 g / 5.7 N
 safe
20 mm 864 Gs
86.4 mT
 0.24 kg / 0.52 lbs
236.9 g / 2.3 N
 safe
30 mm 405 Gs
40.5 mT
 0.05 kg / 0.11 lbs
52.1 g / 0.5 N
 safe
50 mm 133 Gs
13.3 mT
 0.01 kg / 0.01 lbs
5.6 g / 0.1 N
 safe
Pulling power drops drastically per each millimeter of distance. Note that even a very thin break (e.g., contamination, varnish, rust) strongly reduces the pull force. Magnets hold most effectively at the point of direct contact; air break nullifies the force. Analyze how quickly the load capacity fall, when the magnet does not touch directly to the metal substrate. When calculating the mounting, discard redundant distances.

Table 2: Slippage load (vertical surface)
MP 20x5x27 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.07 kg / 4.57 lbs
2072.0 g / 20.3 N
1 mm Stal (~0.2) 1.77 kg / 3.91 lbs
1774.0 g / 17.4 N
2 mm Stal (~0.2) 1.50 kg / 3.30 lbs
1498.0 g / 14.7 N
3 mm Stal (~0.2) 1.25 kg / 2.76 lbs
1254.0 g / 12.3 N
5 mm Stal (~0.2) 0.86 kg / 1.89 lbs
858.0 g / 8.4 N
10 mm Stal (~0.2) 0.31 kg / 0.69 lbs
312.0 g / 3.1 N
15 mm Stal (~0.2) 0.12 kg / 0.26 lbs
116.0 g / 1.1 N
20 mm Stal (~0.2) 0.05 kg / 0.11 lbs
48.0 g / 0.5 N
30 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The table below indicates the estimated force needed to cause the downward movement of the magnet down against a upright metal surface (assuming typical friction coefficient). The holding force depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 20x5x27 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.11 kg / 6.85 lbs
3108.0 g / 30.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.07 kg / 4.57 lbs
2072.0 g / 20.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.04 kg / 2.28 lbs
1036.0 g / 10.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.18 kg / 11.42 lbs
5180.0 g / 50.8 N
When hanging a magnet on a upright wall (e.g., a fridge), it will maintain barely approx. 20%-30% of its nominal power. Gravitational force and a low friction coefficient cause that holders slide down easier than they detach. Planning a hanger? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a much lighter weight. Using a rubber pad can significantly increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MP 20x5x27 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.52 kg / 1.14 lbs
518.0 g / 5.1 N
1 mm
13%
 1.30 kg / 2.85 lbs
1295.0 g / 12.7 N
2 mm
25%
 2.59 kg / 5.71 lbs
2590.0 g / 25.4 N
3 mm
38%
 3.89 kg / 8.56 lbs
3885.0 g / 38.1 N
5 mm
63%
 6.48 kg / 14.27 lbs
6475.0 g / 63.5 N
10 mm
100%
 10.36 kg / 22.84 lbs
10360.0 g / 101.6 N
11 mm
100%
 10.36 kg / 22.84 lbs
10360.0 g / 101.6 N
12 mm
100%
 10.36 kg / 22.84 lbs
10360.0 g / 101.6 N
A thin sheet cannot absorb the entire magnetic field, which squanders power of the holder. If you install a neodymium to a too thin substrate, the field will pass right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you require a sufficiently solid element of metal. The saturation effect causes that on thin elements (e.g., appliance housings), the holder holds weaker. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MP 20x5x27 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.36 kg / 22.84 lbs
10360.0 g / 101.6 N
 OK
40 °C -2.2% 10.13 kg / 22.34 lbs
10132.1 g / 99.4 N
 OK
60 °C -4.4% 9.90 kg / 21.83 lbs
9904.2 g / 97.2 N
 OK
80 °C -6.6% 9.68 kg / 21.33 lbs
9676.2 g / 94.9 N
100 °C -28.8% 7.38 kg / 16.26 lbs
7376.3 g / 72.4 N
Classic neodymiums lose parameters past the thermal threshold. Watch out for overheating – heat can irreversibly demagnetize this product. With increasing heat, the magnet's power momentarily decreases. Refrain from using this magnet close to ovens higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MP 20x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 44.24 kg / 97.54 lbs
6 064 Gs
6.64 kg / 14.63 lbs
6636 g / 65.1 N
 N/A
1 mm 41.02 kg / 90.43 lbs
11 008 Gs
6.15 kg / 13.56 lbs
6153 g / 60.4 N
 36.92 kg / 81.39 lbs
~0 Gs
2 mm 37.86 kg / 83.47 lbs
10 576 Gs
5.68 kg / 12.52 lbs
5679 g / 55.7 N
 34.07 kg / 75.12 lbs
~0 Gs
3 mm 34.85 kg / 76.83 lbs
10 146 Gs
5.23 kg / 11.52 lbs
5227 g / 51.3 N
 31.36 kg / 69.14 lbs
~0 Gs
5 mm 29.30 kg / 64.58 lbs
9 303 Gs
4.39 kg / 9.69 lbs
4394 g / 43.1 N
 26.37 kg / 58.13 lbs
~0 Gs
10 mm 18.30 kg / 40.35 lbs
7 353 Gs
2.75 kg / 6.05 lbs
2745 g / 26.9 N
 16.47 kg / 36.32 lbs
~0 Gs
20 mm 6.65 kg / 14.66 lbs
4 432 Gs
1.00 kg / 2.20 lbs
997 g / 9.8 N
 5.98 kg / 13.19 lbs
~0 Gs
50 mm 0.45 kg / 1.00 lbs
1 159 Gs
0.07 kg / 0.15 lbs
68 g / 0.7 N
 0.41 kg / 0.90 lbs
~0 Gs
60 mm 0.22 kg / 0.49 lbs
811 Gs
0.03 kg / 0.07 lbs
33 g / 0.3 N
 0.20 kg / 0.44 lbs
~0 Gs
70 mm 0.12 kg / 0.26 lbs
589 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.23 lbs
~0 Gs
80 mm 0.07 kg / 0.14 lbs
440 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
90 mm 0.04 kg / 0.09 lbs
338 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.03 kg / 0.08 lbs
~0 Gs
100 mm 0.02 kg / 0.05 lbs
265 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and sheet setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of performance. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when attracting two neodymiums, the collision energy is massive. The repulsion force is marginally weaker than the attraction, but still significant.
*Flux density for N-N configuration reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
* Figures refer to sliding force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 20x5x27 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 18.0 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Timepiece 20 Gs (2.0 mT) 11.0 cm
Mobile device 40 Gs (4.0 mT) 8.5 cm
Car key 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
A strong magnetic field poses a large risk to IT equipment and medical implants. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MP 20x5x27 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 14.40 km/h
(4.00 m/s)
 0.48 J
30 mm 15.54 km/h
(4.32 m/s)
 0.56 J
50 mm 15.59 km/h
(4.33 m/s)
 0.56 J
100 mm 15.60 km/h
(4.33 m/s)
 0.56 J
NdFeB products are prone to chipping – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or painful pinches to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (durability)
MP 20x5x27 / 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 (Flux)
MP 20x5x27 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 314 Mx 143.1 µWb
Pc Coefficient 1.16 High (Stable)
Total magnetic flux passing through the pole surface. Essential parameter when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MP 20x5x27 / N38

Environment Effective steel pull Effect
Air (land) 10.36 kg Standard
Water (riverbed) 11.86 kg
(+1.50 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

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

2. Steel saturation

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.16

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%

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: 030185-2026
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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. 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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure 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. 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 indoor use. For outdoor applications, we recommend choosing rubberized holders 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.
It is a magnetic ring with a diameter of 20 mm and thickness 27 mm. The key parameter here is the lifting capacity amounting to approximately 10.36 kg (force ~101.60 N). 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. 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.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their immense magnetic power, neodymium magnets offer the following advantages:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets remain highly resistant to magnetic field loss caused by magnetic disturbances,
  • By applying a reflective coating of silver, the element has an proper look,
  • Neodymium magnets create maximum magnetic induction on a their surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of custom machining and adapting to individual requirements,
  • Universal use in modern technologies – they find application in mass storage devices, electric motors, medical devices, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing nuts in the magnet and complicated forms - preferred is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what it depends on?

The declared magnet strength refers to the limit force, recorded under ideal test conditions, specifically:
  • on a block made of mild steel, effectively closing the magnetic field
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane perfectly flat
  • with zero gap (without paint)
  • under perpendicular application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

Effective lifting capacity is affected by working environment parameters, such as (from priority):
  • Air gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Steel type – low-carbon steel gives the best results. Alloy steels reduce magnetic permeability and holding force.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Heat sensitivity

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Caution required

Be careful. Rare earth magnets attract from a long distance and snap with massive power, often quicker than you can move away.

Bone fractures

Large magnets can smash fingers instantly. Do not place your hand betwixt two attracting surfaces.

Life threat

Patients with a heart stimulator must maintain an large gap from magnets. The magnetic field can interfere with the functioning of the implant.

Cards and drives

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Swallowing risk

Always store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are fatal.

Phone sensors

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Fire risk

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Fragile material

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Nickel allergy

A percentage of the population have a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in skin redness. It is best to wear protective gloves.

Important! Details about risks in the article: Magnet Safety Guide.