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MP 40x20x5 / N38 - ring magnet

ring magnet

Catalog no 030199

GTIN/EAN: 5906301812166

5.00

Diameter

40 mm [±0,1 mm]

internal diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

35.34 g

Magnetization Direction

↑ axial

Load capacity

7.24 kg / 70.98 N

Magnetic Induction

150.36 mT / 1504 Gs

Coating

[NiCuNi] Nickel

view parameters »

12.24 ZŁ with VAT / pcs + price for transport

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Specifications along with form of a neodymium magnet can be reviewed using our our magnetic calculator.

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Technical specification - MP 40x20x5 / N38 - ring magnet

Specification / characteristics - MP 40x20x5 / N38 - ring magnet

properties
properties values
Cat. no. 030199
GTIN/EAN 5906301812166
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 40 mm [±0,1 mm]
internal diameter Ø 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 35.34 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.24 kg / 70.98 N
Magnetic Induction ~ ? 150.36 mT / 1504 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 40x20x5 / 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 simulation of the assembly - report

Presented data constitute the direct effect of a engineering simulation. Values were calculated on models for the class Nd2Fe14B. Actual performance might slightly differ. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
MP 40x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5269 Gs
526.9 mT
 7.24 kg / 15.96 pounds
7240.0 g / 71.0 N
 medium risk
1 mm 5005 Gs
500.5 mT
 6.53 kg / 14.41 pounds
6534.7 g / 64.1 N
 medium risk
2 mm 4739 Gs
473.9 mT
 5.86 kg / 12.91 pounds
5857.7 g / 57.5 N
 medium risk
3 mm 4475 Gs
447.5 mT
 5.22 kg / 11.51 pounds
5222.2 g / 51.2 N
 medium risk
5 mm 3960 Gs
396.0 mT
 4.09 kg / 9.02 pounds
4090.8 g / 40.1 N
 medium risk
10 mm 2832 Gs
283.2 mT
 2.09 kg / 4.61 pounds
2092.3 g / 20.5 N
 medium risk
15 mm 1990 Gs
199.0 mT
 1.03 kg / 2.28 pounds
1033.4 g / 10.1 N
 low risk
20 mm 1407 Gs
140.7 mT
 0.52 kg / 1.14 pounds
516.3 g / 5.1 N
 low risk
30 mm 745 Gs
74.5 mT
 0.14 kg / 0.32 pounds
144.6 g / 1.4 N
 low risk
50 mm 268 Gs
26.8 mT
 0.02 kg / 0.04 pounds
18.7 g / 0.2 N
 low risk
Magnetic force weakens significantly per each millimeter of gap. Keep in mind that even the smallest gap (e.g., dirt, paint, rust) strongly reduces the pull force. Magnetic products work strongest in perfect adhesion; gap weakens the force. Observe how rapidly the parameters plummet, when the magnet does not touch tightly to the steel surface. When calculating the arrangement, discard redundant distances.

Table 2: Sliding hold (wall)
MP 40x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.45 kg / 3.19 pounds
1448.0 g / 14.2 N
1 mm Stal (~0.2) 1.31 kg / 2.88 pounds
1306.0 g / 12.8 N
2 mm Stal (~0.2) 1.17 kg / 2.58 pounds
1172.0 g / 11.5 N
3 mm Stal (~0.2) 1.04 kg / 2.30 pounds
1044.0 g / 10.2 N
5 mm Stal (~0.2) 0.82 kg / 1.80 pounds
818.0 g / 8.0 N
10 mm Stal (~0.2) 0.42 kg / 0.92 pounds
418.0 g / 4.1 N
15 mm Stal (~0.2) 0.21 kg / 0.45 pounds
206.0 g / 2.0 N
20 mm Stal (~0.2) 0.10 kg / 0.23 pounds
104.0 g / 1.0 N
30 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
The following data presents the theoretical weight limit needed to initiate the shifting of the magnet vertically along a vertical metal surface (considering typical friction). This value is a function of the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 40x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.17 kg / 4.79 pounds
2172.0 g / 21.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.45 kg / 3.19 pounds
1448.0 g / 14.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.72 kg / 1.60 pounds
724.0 g / 7.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.62 kg / 7.98 pounds
3620.0 g / 35.5 N
When mounting a element on a vertical surface (e.g., a fridge), it will maintain barely approx. 20%-30% of its nominal power. Gravitational force and a weak degree of grip cause that products slide down faster than they pop off the substrate. Planning a vertical fastening? Note that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a noticeably lighter weight. Application of an anti-slip layer can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
MP 40x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.72 kg / 1.60 pounds
724.0 g / 7.1 N
1 mm
25%
 1.81 kg / 3.99 pounds
1810.0 g / 17.8 N
2 mm
50%
 3.62 kg / 7.98 pounds
3620.0 g / 35.5 N
3 mm
75%
 5.43 kg / 11.97 pounds
5430.0 g / 53.3 N
5 mm
100%
 7.24 kg / 15.96 pounds
7240.0 g / 71.0 N
10 mm
100%
 7.24 kg / 15.96 pounds
7240.0 g / 71.0 N
11 mm
100%
 7.24 kg / 15.96 pounds
7240.0 g / 71.0 N
12 mm
100%
 7.24 kg / 15.96 pounds
7240.0 g / 71.0 N
A thin sheet is not enough to absorb the full magnetic flux, which squanders power of the magnet. Should you mount a strong magnet to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To achieve 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., appliance housings), the product shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
MP 40x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.24 kg / 15.96 pounds
7240.0 g / 71.0 N
 OK
40 °C -2.2% 7.08 kg / 15.61 pounds
7080.7 g / 69.5 N
 OK
60 °C -4.4% 6.92 kg / 15.26 pounds
6921.4 g / 67.9 N
 OK
80 °C -6.6% 6.76 kg / 14.91 pounds
6762.2 g / 66.3 N
100 °C -28.8% 5.15 kg / 11.36 pounds
5154.9 g / 50.6 N
Classic neodymiums lose parameters past the thermal threshold. Watch out for overheating – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's power briefly decreases. Do not use this magnet near heat sources higher than its working range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field range
MP 40x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 179.94 kg / 396.69 pounds
5 920 Gs
26.99 kg / 59.50 pounds
26991 g / 264.8 N
 N/A
1 mm 171.16 kg / 377.35 pounds
10 277 Gs
25.67 kg / 56.60 pounds
25675 g / 251.9 N
 154.05 kg / 339.62 pounds
~0 Gs
2 mm 162.41 kg / 358.05 pounds
10 011 Gs
24.36 kg / 53.71 pounds
24361 g / 239.0 N
 146.17 kg / 322.24 pounds
~0 Gs
3 mm 153.87 kg / 339.24 pounds
9 744 Gs
23.08 kg / 50.89 pounds
23081 g / 226.4 N
 138.49 kg / 305.31 pounds
~0 Gs
5 mm 137.55 kg / 303.25 pounds
9 213 Gs
20.63 kg / 45.49 pounds
20633 g / 202.4 N
 123.80 kg / 272.92 pounds
~0 Gs
10 mm 101.67 kg / 224.14 pounds
7 921 Gs
15.25 kg / 33.62 pounds
15251 g / 149.6 N
 91.50 kg / 201.73 pounds
~0 Gs
20 mm 52.00 kg / 114.64 pounds
5 665 Gs
7.80 kg / 17.20 pounds
7800 g / 76.5 N
 46.80 kg / 103.18 pounds
~0 Gs
50 mm 6.64 kg / 14.64 pounds
2 025 Gs
1.00 kg / 2.20 pounds
996 g / 9.8 N
 5.98 kg / 13.18 pounds
~0 Gs
60 mm 3.59 kg / 7.92 pounds
1 489 Gs
0.54 kg / 1.19 pounds
539 g / 5.3 N
 3.23 kg / 7.13 pounds
~0 Gs
70 mm 2.03 kg / 4.48 pounds
1 120 Gs
0.30 kg / 0.67 pounds
305 g / 3.0 N
 1.83 kg / 4.03 pounds
~0 Gs
80 mm 1.20 kg / 2.64 pounds
860 Gs
0.18 kg / 0.40 pounds
180 g / 1.8 N
 1.08 kg / 2.38 pounds
~0 Gs
90 mm 0.73 kg / 1.62 pounds
673 Gs
0.11 kg / 0.24 pounds
110 g / 1.1 N
 0.66 kg / 1.46 pounds
~0 Gs
100 mm 0.47 kg / 1.03 pounds
536 Gs
0.07 kg / 0.15 pounds
70 g / 0.7 N
 0.42 kg / 0.92 pounds
~0 Gs
Two strong neodymiums attract each other from a much further distance than a neodymium and metal setup. The connection of two magnets generates a stronger field and a further horizon of performance. Planning to create a solid fastener? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is marginally weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Attention: Results apply to sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MP 40x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 18.5 cm
Timepiece 20 Gs (2.0 mT) 14.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 11.0 cm
Car key 50 Gs (5.0 mT) 10.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Extremely neodym field is a real danger to IT equipment as well as pacemakers. These neodymiums produce a flux that destroys function of digital equipment. Notice: the unseen radiation acts through matter and glass. Special caution must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MP 40x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.84 km/h
(4.68 m/s)
 0.39 J
30 mm 25.31 km/h
(7.03 m/s)
 0.87 J
50 mm 32.33 km/h
(8.98 m/s)
 1.43 J
100 mm 45.65 km/h
(12.68 m/s)
 2.84 J
Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (durability)
MP 40x20x5 / 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 following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MP 40x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 56 325 Mx 563.3 µWb
Pc Coefficient 0.80 High (Stable)
Flux value emitted by the magnet pole. Key data for generator designers as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 40x20x5 / N38

Environment Effective steel pull Effect
Air (land) 7.24 kg Standard
Water (riverbed) 8.29 kg
(+1.05 kg buoyancy gain)
+14.5%
Corrosion warning: 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. Vertical hold

*Caution: On a vertical wall, the magnet retains just ~20% of its perpendicular strength.

2. Steel saturation

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

3. Power loss vs temp

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.80

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: 030199-2026
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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 is a crucial issue when working with model MP 40x20x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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. 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. 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.
The presented product is a ring magnet with dimensions Ø40 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 7.24 kg, which translates to 70.98 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 20 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They do not lose magnetism, even over approximately ten years – the reduction in strength is only ~1% (according to tests),
  • Neodymium magnets prove to be remarkably resistant to loss of magnetic properties caused by magnetic disturbances,
  • In other words, due to the aesthetic finish of nickel, the element gains visual value,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of detailed forming as well as adapting to precise requirements,
  • Huge importance in electronics industry – they are commonly used in data components, electric motors, medical equipment, as well as multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

The declared magnet strength represents the maximum value, obtained under ideal test conditions, meaning:
  • on a base made of mild steel, optimally conducting the magnetic field
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an polished touching surface
  • without the slightest insulating layer between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the application force will differ depending on the following factors, starting with the most relevant:
  • Distance (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material composition – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safe handling of NdFeB magnets
Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.

Fire warning

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Impact on smartphones

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Protective goggles

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Collision of two magnets will cause them shattering into shards.

Protect data

Device Safety: Strong magnets can damage payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Heat warning

Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Medical implants

For implant holders: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Do not give to children

Adult use only. Small elements can be swallowed, leading to serious injuries. Keep away from children and animals.

Crushing force

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Respect the power

Handle with care. Neodymium magnets attract from a long distance and snap with massive power, often quicker than you can move away.

Caution! More info about hazards in the article: Magnet Safety Guide.