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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

see technical specifications »

2.76 ZŁ with VAT / pcs + price for transport

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Technical - 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

Engineering modeling of the magnet - report

The following values represent the result of a physical analysis. Values were calculated on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
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 LBS
6490.0 g / 63.7 N
 warning
1 mm 5321 Gs
532.1 mT
 5.25 kg / 11.57 LBS
5249.3 g / 51.5 N
 warning
2 mm 4736 Gs
473.6 mT
 4.16 kg / 9.17 LBS
4158.8 g / 40.8 N
 warning
3 mm 4184 Gs
418.4 mT
 3.25 kg / 7.15 LBS
3245.0 g / 31.8 N
 warning
5 mm 3216 Gs
321.6 mT
 1.92 kg / 4.23 LBS
1917.2 g / 18.8 N
 low risk
10 mm 1650 Gs
165.0 mT
 0.50 kg / 1.11 LBS
504.5 g / 4.9 N
 low risk
15 mm 907 Gs
90.7 mT
 0.15 kg / 0.34 LBS
152.6 g / 1.5 N
 low risk
20 mm 544 Gs
54.4 mT
 0.05 kg / 0.12 LBS
54.9 g / 0.5 N
 low risk
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.02 LBS
10.7 g / 0.1 N
 low risk
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 LBS
1.0 g / 0.0 N
 low risk
Magnetic force weakens significantly with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., contamination, paint, rust) strongly weakens the grip. Neodymiums hold most effectively in perfect adhesion; air break weakens the power. Observe how flashily the load capacity fall, when the product does not adhere directly to the metal substrate. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Slippage 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 LBS
1298.0 g / 12.7 N
1 mm Stal (~0.2) 1.05 kg / 2.31 LBS
1050.0 g / 10.3 N
2 mm Stal (~0.2) 0.83 kg / 1.83 LBS
832.0 g / 8.2 N
3 mm Stal (~0.2) 0.65 kg / 1.43 LBS
650.0 g / 6.4 N
5 mm Stal (~0.2) 0.38 kg / 0.85 LBS
384.0 g / 3.8 N
10 mm Stal (~0.2) 0.10 kg / 0.22 LBS
100.0 g / 1.0 N
15 mm Stal (~0.2) 0.03 kg / 0.07 LBS
30.0 g / 0.3 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The following data presents the theoretical shear load sufficient to cause the sliding of the magnet downwards along a vertical steel plate (considering typical friction). The holding force is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 LBS
1947.0 g / 19.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.30 kg / 2.86 LBS
1298.0 g / 12.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.65 kg / 1.43 LBS
649.0 g / 6.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.25 kg / 7.15 LBS
3245.0 g / 31.8 N
When mounting a element on a upright wall (e.g., a car body), it will only hold barely approx. 20%-30% of its nominal power. Gravity and a weak degree of grip cause that products slide down easier than they pull off. Designing a vertical fastening? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller weight. Application of an anti-slip pad can significantly increase the grip.

Table 4: Steel thickness (saturation) - power losses
MP 20x5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.65 kg / 1.43 LBS
649.0 g / 6.4 N
1 mm
25%
 1.62 kg / 3.58 LBS
1622.5 g / 15.9 N
2 mm
50%
 3.25 kg / 7.15 LBS
3245.0 g / 31.8 N
3 mm
75%
 4.87 kg / 10.73 LBS
4867.5 g / 47.8 N
5 mm
100%
 6.49 kg / 14.31 LBS
6490.0 g / 63.7 N
10 mm
100%
 6.49 kg / 14.31 LBS
6490.0 g / 63.7 N
11 mm
100%
 6.49 kg / 14.31 LBS
6490.0 g / 63.7 N
12 mm
100%
 6.49 kg / 14.31 LBS
6490.0 g / 63.7 N
A thin sheet is incapable of take in the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To achieve the maximum of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect causes that on sheet metal structures (e.g., car bodies), the product shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - 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 LBS
6490.0 g / 63.7 N
 OK
40 °C -2.2% 6.35 kg / 13.99 LBS
6347.2 g / 62.3 N
 OK
60 °C -4.4% 6.20 kg / 13.68 LBS
6204.4 g / 60.9 N
 OK
80 °C -6.6% 6.06 kg / 13.36 LBS
6061.7 g / 59.5 N
100 °C -28.8% 4.62 kg / 10.19 LBS
4620.9 g / 45.3 N
Standard neodymium magnets irreversibly lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently demagnetize this product. With increasing heat, the magnet's force momentarily decreases. Refrain from using this product near heat sources higher than its safe range. Too high temperature will cause permanent loss of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.03 kg / 119.11 LBS
6 121 Gs
8.10 kg / 17.87 LBS
8104 g / 79.5 N
 N/A
1 mm 48.76 kg / 107.50 LBS
11 242 Gs
7.31 kg / 16.13 LBS
7314 g / 71.8 N
 43.89 kg / 96.75 LBS
~0 Gs
2 mm 43.70 kg / 96.34 LBS
10 642 Gs
6.55 kg / 14.45 LBS
6555 g / 64.3 N
 39.33 kg / 86.71 LBS
~0 Gs
3 mm 38.98 kg / 85.94 LBS
10 051 Gs
5.85 kg / 12.89 LBS
5847 g / 57.4 N
 35.08 kg / 77.34 LBS
~0 Gs
5 mm 30.63 kg / 67.54 LBS
8 910 Gs
4.60 kg / 10.13 LBS
4595 g / 45.1 N
 27.57 kg / 60.78 LBS
~0 Gs
10 mm 15.96 kg / 35.19 LBS
6 432 Gs
2.39 kg / 5.28 LBS
2394 g / 23.5 N
 14.36 kg / 31.67 LBS
~0 Gs
20 mm 4.20 kg / 9.26 LBS
3 299 Gs
0.63 kg / 1.39 LBS
630 g / 6.2 N
 3.78 kg / 8.33 LBS
~0 Gs
50 mm 0.19 kg / 0.42 LBS
702 Gs
0.03 kg / 0.06 LBS
29 g / 0.3 N
 0.17 kg / 0.38 LBS
~0 Gs
60 mm 0.09 kg / 0.20 LBS
480 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.18 LBS
~0 Gs
70 mm 0.05 kg / 0.10 LBS
342 Gs
0.01 kg / 0.01 LBS
7 g / 0.1 N
 0.04 kg / 0.09 LBS
~0 Gs
80 mm 0.02 kg / 0.05 LBS
253 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
90 mm 0.01 kg / 0.03 LBS
193 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
100 mm 0.01 kg / 0.02 LBS
150 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Be careful that when bringing together two magnets, the impact force is huge. The levitation is a bit weaker than the attraction, but still significant.
*Flux density between like poles reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Estimates refer to shear force of dual same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - 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
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 poses a real danger to IT equipment as well as pacemakers. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
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
Neodymium magnets are prone to chipping – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can cause material chips or injury to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when working with powerful specimens.

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)
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: 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)
Flux value emitted by the pole surface. Key data in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: 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. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical wall, the magnet retains only approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Temperature resistance

*For standard magnets, the critical 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
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: 030186-2026
Magnet Unit Converter
Force (pull)
Field Strength
Input a figure in a single slot to see the conversion for the other fields at once.

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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. This product with a force of 6.49 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 20x5x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable 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. The flat screw head should evenly press the magnet. 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 can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building 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. 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.
This model is characterized by dimensions Ø20x5 mm and a weight of 11.04 g. 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.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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). 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 rare earth magnets.

Advantages

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • They have stable power, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets remain remarkably resistant to loss of magnetic properties caused by external field sources,
  • By applying a lustrous layer of silver, the element has an aesthetic look,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
  • Considering the option of precise molding and customization to specialized projects, magnetic components can be created in a broad palette of shapes and sizes, which makes them more universal,
  • Universal use in innovative solutions – they are utilized in computer drives, motor assemblies, precision medical tools, and multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex forms.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these magnets 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

Pull force analysis

Maximum lifting capacity of the magnet – what affects it?

Magnet power is the result of a measurement for the most favorable conditions, taking into account:
  • using a plate made of mild steel, functioning as a magnetic yoke
  • with a cross-section minimum 10 mm
  • with an ground contact surface
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Real force is affected by specific conditions, such as (from most important):
  • Gap (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Physical harm

Pinching hazard: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Beware of splinters

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Nickel allergy

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction occurs, cease handling magnets and wear gloves.

Implant safety

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Flammability

Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Maximum temperature

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. Damage is permanent.

Caution required

Handle magnets consciously. Their huge power can surprise even professionals. Stay alert and do not underestimate their power.

Cards and drives

Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Keep away from children

NdFeB magnets are not toys. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a critical condition and requires immediate surgery.

Threat to navigation

Be aware: neodymium magnets produce a field that interferes with sensitive sensors. Keep a separation from your phone, tablet, and navigation systems.

Security! Learn more about risks in the article: Magnet Safety Guide.