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MP 20x5x27 / N38 - ring magnet

ring magnet

Catalog no 030185

GTIN/EAN: 5906301812029

5.00

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

technical details »

33.00 ZŁ with VAT / pcs + price for transport

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Technical details - 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

Engineering simulation of the product - data

Presented values constitute the outcome of a engineering simulation. Results are based on models for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Please consider these data as a supplementary guide for designers.

Table 1: Static pull force (force 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
 critical level
1 mm 5288 Gs
528.8 mT
 8.87 kg / 19.55 LBS
8865.5 g / 87.0 N
 warning
2 mm 4861 Gs
486.1 mT
 7.49 kg / 16.51 LBS
7491.0 g / 73.5 N
 warning
3 mm 4446 Gs
444.6 mT
 6.27 kg / 13.82 LBS
6267.5 g / 61.5 N
 warning
5 mm 3677 Gs
367.7 mT
 4.29 kg / 9.45 LBS
4285.9 g / 42.0 N
 warning
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
Grip strength drops significantly with every subsequent millimeter of gap. Keep in mind that even the smallest gap (e.g., dirt, paint, veneer) strongly diminishes the holding power. Neodymiums operate most effectively at the point of direct contact; air break nullifies the force. Notice how quickly the load capacity plummet, when the magnet does not touch directly to the metal substrate. When designing the mounting, discard unnecessary gaps.

Table 2: Vertical force (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
This section calculates the estimated holding capacity needed to start the shifting of the magnet vertically on a vertical metal surface (considering standard friction). This parameter is a function of the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
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 placing a element on a upright surface (e.g., a fridge), it you can count on just about 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that magnets slip easier than they detach. Want to create a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will give way down under a much lighter weight. Application of an anti-slip pad can drastically improve the result.

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 metal plate is incapable of absorb the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a too thin substrate, the field will pass right through and the holding will be smaller. To utilize full efficiency of this magnet's potential, you need a suitably thick piece of steel. The material oversaturation means that on delicate walls (e.g., thin profiles), the product shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (stability) - thermal limit
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 change their properties strength above the temperature limit. Watch out for overheating – heat can permanently destroy this magnet. As the temperature rises, the neodymium's power temporarily decreases. Refrain from using this product near heat sources higher than its operating temperature limit. Exceeding the critical threshold will result in irreversible degradation of magnetism.
*Important note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) risk losing magnetic properties sooner than long magnets. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MP 20x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 magnets attract each other from a wider radius than a neodymium and metal combination. Such a system of magnet-to-magnet produces a massive flux and a larger range of action. Want to build a powerful holder? Apply two magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is huge. The repulsion force is a bit weaker than the connection force, but still large.
*The magnetic induction in repulsion mode drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Figures apply to sliding force of a pair of same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - 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
Mechanical watch 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 serious hazard to electronics and medical implants. These magnets produce a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field penetrates the body and glass. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MP 20x5x27 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 14.49 km/h
(4.02 m/s)
 0.48 J
30 mm 23.09 km/h
(6.42 m/s)
 1.23 J
50 mm 29.73 km/h
(8.26 m/s)
 2.03 J
100 mm 42.03 km/h
(11.68 m/s)
 4.07 J
Magnetic elements are very brittle – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can cause material chips or injury to fingers. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Wear eye protection when handling with powerful specimens.

Table 9: Anti-corrosion coating 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction 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 magnet pole. Key data in coil applications as well as sensors. Pc value 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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Note: On a vertical surface, the magnet holds just a fraction of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens 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) = 1.16

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%
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: 030185-2026
Measurement Calculator
Force (pull)
Field Strength
Put your value in a single slot to see the conversion in all other units immediately.

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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 excessive force will cause the ring to crack. The flat screw head should evenly press the magnet. 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. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. 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 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. 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.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Apart from their notable power, neodymium magnets have these key benefits:
  • Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of exact creating as well as modifying to complex applications,
  • Universal use in modern technologies – they are used in data components, motor assemblies, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 very resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing threads and complex forms in magnets, we recommend using cover - magnetic mount.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • Due to expensive raw materials, their price is relatively high,

Pull force analysis

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

The force parameter is a result of laboratory testing conducted under standard conditions:
  • on a block made of mild steel, effectively closing the magnetic field
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an polished touching surface
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at standard ambient temperature

Magnet lifting force in use – key factors

Bear in mind that the application force may be lower depending on the following factors, in order of importance:
  • Air gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, 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 surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces 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 holding force.

Precautions when working with neodymium magnets
Shattering risk

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Pinching danger

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

Power loss in heat

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Handling guide

Be careful. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can react.

Data carriers

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, timepieces).

Threat to navigation

Remember: neodymium magnets produce a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Allergic reactions

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness occurs, cease handling magnets and use protective gear.

Do not drill into magnets

Drilling and cutting of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Medical implants

Individuals with a ICD must keep an safe separation from magnets. The magnetic field can stop the functioning of the implant.

Swallowing risk

Only for adults. Small elements can be swallowed, causing severe trauma. Store away from children and animals.

Caution! Learn more about hazards in the article: Magnet Safety Guide.