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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

9.95 ZŁ net + 23% VAT / pcs

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Lifting power along with shape of a neodymium magnet can be calculated with our magnetic calculator.

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Technical - 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

Engineering simulation of the magnet - report

The following data constitute the outcome of a engineering analysis. Values rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Treat these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
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 LBS
7240.0 g / 71.0 N
 strong
1 mm 5005 Gs
500.5 mT
 6.53 kg / 14.41 LBS
6534.7 g / 64.1 N
 strong
2 mm 4739 Gs
473.9 mT
 5.86 kg / 12.91 LBS
5857.7 g / 57.5 N
 strong
3 mm 4475 Gs
447.5 mT
 5.22 kg / 11.51 LBS
5222.2 g / 51.2 N
 strong
5 mm 3960 Gs
396.0 mT
 4.09 kg / 9.02 LBS
4090.8 g / 40.1 N
 strong
10 mm 2832 Gs
283.2 mT
 2.09 kg / 4.61 LBS
2092.3 g / 20.5 N
 strong
15 mm 1990 Gs
199.0 mT
 1.03 kg / 2.28 LBS
1033.4 g / 10.1 N
 safe
20 mm 1407 Gs
140.7 mT
 0.52 kg / 1.14 LBS
516.3 g / 5.1 N
 safe
30 mm 745 Gs
74.5 mT
 0.14 kg / 0.32 LBS
144.6 g / 1.4 N
 safe
50 mm 268 Gs
26.8 mT
 0.02 kg / 0.04 LBS
18.7 g / 0.2 N
 safe
Magnetic force drops drastically per each millimeter of distance. Note that even a microscopic distance (e.g., contamination, paint, rust) significantly weakens the grip. Magnetic products operate optimally at the point of direct contact; air break weakens the force. Observe how flashily the pull force fall, when the product does not adhere tightly to the steel surface. When calculating the assembly, discard redundant distances.

Table 2: Shear hold (vertical surface)
MP 40x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.45 kg / 3.19 LBS
1448.0 g / 14.2 N
1 mm Stal (~0.2) 1.31 kg / 2.88 LBS
1306.0 g / 12.8 N
2 mm Stal (~0.2) 1.17 kg / 2.58 LBS
1172.0 g / 11.5 N
3 mm Stal (~0.2) 1.04 kg / 2.30 LBS
1044.0 g / 10.2 N
5 mm Stal (~0.2) 0.82 kg / 1.80 LBS
818.0 g / 8.0 N
10 mm Stal (~0.2) 0.42 kg / 0.92 LBS
418.0 g / 4.1 N
15 mm Stal (~0.2) 0.21 kg / 0.45 LBS
206.0 g / 2.0 N
20 mm Stal (~0.2) 0.10 kg / 0.23 LBS
104.0 g / 1.0 N
30 mm Stal (~0.2) 0.03 kg / 0.06 LBS
28.0 g / 0.3 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The table below indicates the approximate force needed to start the slippage of the magnet vertically along a vertical steel wall (considering standard friction). The holding force varies with the air gap between the magnet and the surface.

Table 3: Wall mounting (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 LBS
2172.0 g / 21.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.45 kg / 3.19 LBS
1448.0 g / 14.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.72 kg / 1.60 LBS
724.0 g / 7.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.62 kg / 7.98 LBS
3620.0 g / 35.5 N
When placing a element on a upright wall (e.g., a board), it will maintain barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that holders move down faster than they detach. Planning a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a significantly smaller load. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 40x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.72 kg / 1.60 LBS
724.0 g / 7.1 N
1 mm
25%
 1.81 kg / 3.99 LBS
1810.0 g / 17.8 N
2 mm
50%
 3.62 kg / 7.98 LBS
3620.0 g / 35.5 N
3 mm
75%
 5.43 kg / 11.97 LBS
5430.0 g / 53.3 N
5 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
10 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
11 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
12 mm
100%
 7.24 kg / 15.96 LBS
7240.0 g / 71.0 N
A too thin steel is incapable of absorb the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a weak sheet, the flux will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's potential, you need a suitably thick piece of steel. The material oversaturation means that on thin elements (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - 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 LBS
7240.0 g / 71.0 N
 OK
40 °C -2.2% 7.08 kg / 15.61 LBS
7080.7 g / 69.5 N
 OK
60 °C -4.4% 6.92 kg / 15.26 LBS
6921.4 g / 67.9 N
 OK
80 °C -6.6% 6.76 kg / 14.91 LBS
6762.2 g / 66.3 N
100 °C -28.8% 5.15 kg / 11.36 LBS
5154.9 g / 50.6 N
Standard neodymium magnets lose parameters after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently damage this product. With increasing heat, the neodymium's force momentarily drops. Refrain from using this magnet close to heaters higher than its operating temperature limit. Too high temperature will lead to destruction of magnetic properties.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) are more susceptible to demagnetization under lower heat stress than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 179.94 kg / 396.69 LBS
5 920 Gs
26.99 kg / 59.50 LBS
26991 g / 264.8 N
 N/A
1 mm 171.16 kg / 377.35 LBS
10 277 Gs
25.67 kg / 56.60 LBS
25675 g / 251.9 N
 154.05 kg / 339.62 LBS
~0 Gs
2 mm 162.41 kg / 358.05 LBS
10 011 Gs
24.36 kg / 53.71 LBS
24361 g / 239.0 N
 146.17 kg / 322.24 LBS
~0 Gs
3 mm 153.87 kg / 339.24 LBS
9 744 Gs
23.08 kg / 50.89 LBS
23081 g / 226.4 N
 138.49 kg / 305.31 LBS
~0 Gs
5 mm 137.55 kg / 303.25 LBS
9 213 Gs
20.63 kg / 45.49 LBS
20633 g / 202.4 N
 123.80 kg / 272.92 LBS
~0 Gs
10 mm 101.67 kg / 224.14 LBS
7 921 Gs
15.25 kg / 33.62 LBS
15251 g / 149.6 N
 91.50 kg / 201.73 LBS
~0 Gs
20 mm 52.00 kg / 114.64 LBS
5 665 Gs
7.80 kg / 17.20 LBS
7800 g / 76.5 N
 46.80 kg / 103.18 LBS
~0 Gs
50 mm 6.64 kg / 14.64 LBS
2 025 Gs
1.00 kg / 2.20 LBS
996 g / 9.8 N
 5.98 kg / 13.18 LBS
~0 Gs
60 mm 3.59 kg / 7.92 LBS
1 489 Gs
0.54 kg / 1.19 LBS
539 g / 5.3 N
 3.23 kg / 7.13 LBS
~0 Gs
70 mm 2.03 kg / 4.48 LBS
1 120 Gs
0.30 kg / 0.67 LBS
305 g / 3.0 N
 1.83 kg / 4.03 LBS
~0 Gs
80 mm 1.20 kg / 2.64 LBS
860 Gs
0.18 kg / 0.40 LBS
180 g / 1.8 N
 1.08 kg / 2.38 LBS
~0 Gs
90 mm 0.73 kg / 1.62 LBS
673 Gs
0.11 kg / 0.24 LBS
110 g / 1.1 N
 0.66 kg / 1.46 LBS
~0 Gs
100 mm 0.47 kg / 1.03 LBS
536 Gs
0.07 kg / 0.15 LBS
70 g / 0.7 N
 0.42 kg / 0.92 LBS
~0 Gs
Two magnetic products attract each other from a much further distance than a magnet and steel combination. Such a system of magnet-to-magnet generates a stronger field and a further horizon of operation. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, but still significant.
*The magnetic induction in repulsion mode reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Attention: Figures show friction force of two identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - warnings
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
Mobile device 40 Gs (4.0 mT) 11.0 cm
Remote 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
A strong magnetic field is a serious hazard to IT equipment and medical implants. These NdFeB products generate a field that destroys function of sensitive medical devices. Be aware: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
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
Neodymium magnets 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 dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Surface protection spec
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Sliding resistance

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

2. Plate thickness effect

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

3. Thermal stability

*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) = 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.

Engineering data and GPSR
Material specification
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%
Environmental data
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. 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. 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 easily scratched when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
A screw or bolt with a thread diameter smaller than 20 mm fits this model. 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 (40 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø40x5 mm and a weight of 35.34 g. The key parameter here is the holding force amounting to approximately 7.24 kg (force ~70.98 N). 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.

Advantages as well as disadvantages of neodymium magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • Neodymium magnets prove to be extremely resistant to demagnetization caused by external interference,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnetic induction on the top side of the magnet remains impressive,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to flexibility in shaping and the capacity to modify to individual projects,
  • Wide application in electronics industry – they serve a role in HDD drives, electric drive systems, medical equipment, and other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Best holding force of the magnet in ideal parameters – what affects it?

Magnet power is the result of a measurement for the most favorable conditions, including:
  • using a sheet made of low-carbon steel, functioning as a circuit closing element
  • whose thickness is min. 10 mm
  • with an ground touching surface
  • with direct contact (without coatings)
  • during detachment in a direction vertical to the plane
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding will differ influenced by the following factors, in order of importance:
  • Clearance – the presence of foreign body (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Warnings
Fragile material

Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Machining danger

Dust generated during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Serious injuries

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Skin irritation risks

Some people have a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause a rash. We strongly advise wear safety gloves.

Demagnetization risk

Keep cool. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Compass and GPS

Be aware: rare earth magnets produce a field that confuses precision electronics. Keep a separation from your phone, device, and navigation systems.

Cards and drives

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

Caution required

Handle magnets with awareness. Their huge power can surprise even experienced users. Be vigilant and do not underestimate their force.

Do not give to children

Product intended for adults. Small elements can be swallowed, causing severe trauma. Store away from kids and pets.

Health Danger

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Attention! Need more info? Check our post: Are neodymium magnets dangerous?