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MP 62x42x25 / N38 - ring magnet

ring magnet

Catalog no 030205

GTIN/EAN: 5906301812227

5.00

Diameter

62 mm [±0,1 mm]

internal diameter Ø

42 mm [±0,1 mm]

Height

25 mm [±0,1 mm]

Weight

306.31 g

Magnetization Direction

↑ axial

Load capacity

58.67 kg / 575.60 N

Magnetic Induction

389.14 mT / 3891 Gs

Coating

[NiCuNi] Nickel

see parameters »

165.00 ZŁ with VAT / pcs + price for transport

134.15 ZŁ net + 23% VAT / pcs

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Technical details - MP 62x42x25 / N38 - ring magnet

Specification / characteristics - MP 62x42x25 / N38 - ring magnet

properties
properties values
Cat. no. 030205
GTIN/EAN 5906301812227
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 62 mm [±0,1 mm]
internal diameter Ø 42 mm [±0,1 mm]
Height 25 mm [±0,1 mm]
Weight 306.31 g
Magnetization Direction ↑ axial
Load capacity ~ ? 58.67 kg / 575.60 N
Magnetic Induction ~ ? 389.14 mT / 3891 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 62x42x25 / 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 assembly - technical parameters

Presented information are the outcome of a physical analysis. Results rely on algorithms for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
MP 62x42x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4472 Gs
447.2 mT
 58.67 kg / 129.35 LBS
58670.0 g / 575.6 N
 crushing
1 mm 4338 Gs
433.8 mT
 55.21 kg / 121.72 LBS
55213.2 g / 541.6 N
 crushing
2 mm 4201 Gs
420.1 mT
 51.77 kg / 114.13 LBS
51768.5 g / 507.8 N
 crushing
3 mm 4061 Gs
406.1 mT
 48.39 kg / 106.69 LBS
48394.9 g / 474.8 N
 crushing
5 mm 3781 Gs
378.1 mT
 41.94 kg / 92.47 LBS
41942.4 g / 411.5 N
 crushing
10 mm 3097 Gs
309.7 mT
 28.15 kg / 62.06 LBS
28148.0 g / 276.1 N
 crushing
15 mm 2485 Gs
248.5 mT
 18.12 kg / 39.94 LBS
18118.5 g / 177.7 N
 crushing
20 mm 1972 Gs
197.2 mT
 11.41 kg / 25.16 LBS
11412.7 g / 112.0 N
 crushing
30 mm 1239 Gs
123.9 mT
 4.51 kg / 9.93 LBS
4505.2 g / 44.2 N
 medium risk
50 mm 533 Gs
53.3 mT
 0.83 kg / 1.84 LBS
832.4 g / 8.2 N
 safe
Grip strength drops significantly with every subsequent millimeter of gap. Note that even the smallest gap (e.g., dirt, varnish, rust) strongly weakens the grip. Magnets work optimally in perfect adhesion; gap nullifies the force. Notice how quickly the parameters fall, when the product does not adhere flatly to the steel surface. When planning the mounting, eliminate redundant distances.

Table 2: Sliding hold (vertical surface)
MP 62x42x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 11.73 kg / 25.87 LBS
11734.0 g / 115.1 N
1 mm Stal (~0.2) 11.04 kg / 24.34 LBS
11042.0 g / 108.3 N
2 mm Stal (~0.2) 10.35 kg / 22.83 LBS
10354.0 g / 101.6 N
3 mm Stal (~0.2) 9.68 kg / 21.34 LBS
9678.0 g / 94.9 N
5 mm Stal (~0.2) 8.39 kg / 18.49 LBS
8388.0 g / 82.3 N
10 mm Stal (~0.2) 5.63 kg / 12.41 LBS
5630.0 g / 55.2 N
15 mm Stal (~0.2) 3.62 kg / 7.99 LBS
3624.0 g / 35.6 N
20 mm Stal (~0.2) 2.28 kg / 5.03 LBS
2282.0 g / 22.4 N
30 mm Stal (~0.2) 0.90 kg / 1.99 LBS
902.0 g / 8.8 N
50 mm Stal (~0.2) 0.17 kg / 0.37 LBS
166.0 g / 1.6 N
The table below presents the theoretical holding capacity sufficient to initiate the slippage of the magnet downwards against a upright steel plate (considering standard friction). This value varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MP 62x42x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
17.60 kg / 38.80 LBS
17601.0 g / 172.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
11.73 kg / 25.87 LBS
11734.0 g / 115.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
5.87 kg / 12.93 LBS
5867.0 g / 57.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
29.34 kg / 64.67 LBS
29335.0 g / 287.8 N
When placing a magnet on a upright wall (e.g., a fridge), it you can count on barely approx. 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that magnets move down faster than they pop off the substrate. Designing a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slip down under a significantly smaller weight. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - power losses
MP 62x42x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 1.96 kg / 4.31 LBS
1955.7 g / 19.2 N
1 mm
8%
 4.89 kg / 10.78 LBS
4889.2 g / 48.0 N
2 mm
17%
 9.78 kg / 21.56 LBS
9778.3 g / 95.9 N
3 mm
25%
 14.67 kg / 32.34 LBS
14667.5 g / 143.9 N
5 mm
42%
 24.45 kg / 53.89 LBS
24445.8 g / 239.8 N
10 mm
83%
 48.89 kg / 107.79 LBS
48891.7 g / 479.6 N
11 mm
92%
 53.78 kg / 118.57 LBS
53780.8 g / 527.6 N
12 mm
100%
 58.67 kg / 129.35 LBS
58670.0 g / 575.6 N
A thin sheet is not enough to absorb the full magnetic flux, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the field will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MP 62x42x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 58.67 kg / 129.35 LBS
58670.0 g / 575.6 N
 OK
40 °C -2.2% 57.38 kg / 126.50 LBS
57379.3 g / 562.9 N
 OK
60 °C -4.4% 56.09 kg / 123.65 LBS
56088.5 g / 550.2 N
 OK
80 °C -6.6% 54.80 kg / 120.81 LBS
54797.8 g / 537.6 N
100 °C -28.8% 41.77 kg / 92.09 LBS
41773.0 g / 409.8 N
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Protect against heat – heat can irreversibly damage this product. As the temperature rises, the neodymium's power temporarily lowers. Avoid using this product in hot environments higher than its safe range. Ignoring the limit will cause irreversible degradation of magnetism.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MP 62x42x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 264.93 kg / 584.07 LBS
5 588 Gs
39.74 kg / 87.61 LBS
39740 g / 389.8 N
 N/A
1 mm 257.19 kg / 567.00 LBS
8 812 Gs
38.58 kg / 85.05 LBS
38578 g / 378.4 N
 231.47 kg / 510.30 LBS
~0 Gs
2 mm 249.32 kg / 549.66 LBS
8 676 Gs
37.40 kg / 82.45 LBS
37398 g / 366.9 N
 224.39 kg / 494.69 LBS
~0 Gs
3 mm 241.51 kg / 532.44 LBS
8 539 Gs
36.23 kg / 79.87 LBS
36227 g / 355.4 N
 217.36 kg / 479.19 LBS
~0 Gs
5 mm 226.10 kg / 498.47 LBS
8 262 Gs
33.92 kg / 74.77 LBS
33915 g / 332.7 N
 203.49 kg / 448.62 LBS
~0 Gs
10 mm 189.40 kg / 417.55 LBS
7 562 Gs
28.41 kg / 62.63 LBS
28409 g / 278.7 N
 170.46 kg / 375.79 LBS
~0 Gs
20 mm 127.11 kg / 280.22 LBS
6 195 Gs
19.07 kg / 42.03 LBS
19066 g / 187.0 N
 114.40 kg / 252.20 LBS
~0 Gs
50 mm 32.28 kg / 71.17 LBS
3 122 Gs
4.84 kg / 10.68 LBS
4843 g / 47.5 N
 29.06 kg / 64.06 LBS
~0 Gs
60 mm 20.34 kg / 44.85 LBS
2 478 Gs
3.05 kg / 6.73 LBS
3052 g / 29.9 N
 18.31 kg / 40.36 LBS
~0 Gs
70 mm 12.99 kg / 28.63 LBS
1 980 Gs
1.95 kg / 4.29 LBS
1948 g / 19.1 N
 11.69 kg / 25.77 LBS
~0 Gs
80 mm 8.43 kg / 18.59 LBS
1 595 Gs
1.26 kg / 2.79 LBS
1265 g / 12.4 N
 7.59 kg / 16.73 LBS
~0 Gs
90 mm 5.58 kg / 12.29 LBS
1 298 Gs
0.84 kg / 1.84 LBS
836 g / 8.2 N
 5.02 kg / 11.06 LBS
~0 Gs
100 mm 3.76 kg / 8.29 LBS
1 065 Gs
0.56 kg / 1.24 LBS
564 g / 5.5 N
 3.38 kg / 7.46 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a neodymium and metal setup. The connection of magnet-to-magnet produces a massive flux and a wider radius of operation. Want to build a strong closure? Apply two magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the pinch force is massive. The levitation is slightly lower than the attraction, but still significant.
*Field value in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Estimates apply to shear force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MP 62x42x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 32.5 cm
Hearing aid 10 Gs (1.0 mT) 25.5 cm
Timepiece 20 Gs (2.0 mT) 20.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 15.5 cm
Remote 50 Gs (5.0 mT) 14.0 cm
Payment card 400 Gs (40.0 mT) 6.0 cm
HDD hard drive 600 Gs (60.0 mT) 5.0 cm
A strong magnetic field is a serious hazard to electronic devices as well as pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Notice: the invisible magnetic field acts through matter and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MP 62x42x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.65 km/h
(4.90 m/s)
 3.68 J
30 mm 25.31 km/h
(7.03 m/s)
 7.57 J
50 mm 31.49 km/h
(8.75 m/s)
 11.72 J
100 mm 44.16 km/h
(12.27 m/s)
 23.04 J
NdFeB products are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting 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 neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (durability)
MP 62x42x25 / 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 (Flux)
MP 62x42x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 100 906 Mx 1009.1 µWb
Pc Coefficient 0.64 High (Stable)
Flux value passing through the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MP 62x42x25 / N38

Environment Effective steel pull Effect
Air (land) 58.67 kg Standard
Water (riverbed) 67.18 kg
(+8.51 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

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

2. Steel saturation

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

3. Thermal stability

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.64

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%
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: 030205-2026
Magnet Unit Converter
Magnet pull force
Magnetic Field
Type data in one of the inputs, to see the remaining units convert on the fly.

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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 58.67 kg works great as a door latch, speaker holder, or spacer element in devices.
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. It's a good idea to use a flexible washer 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 does not ensure full waterproofing. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 42 mm fits this model. 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 (62 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 62 mm and thickness 25 mm. The key parameter here is the holding force amounting to approximately 58.67 kg (force ~575.60 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 42 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 and cons of Nd2Fe14B magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after around 10 years it decreases only by ~1% (according to research),
  • Neodymium magnets remain exceptionally resistant to magnetic field loss caused by magnetic disturbances,
  • In other words, due to the shiny finish of gold, the element is aesthetically pleasing,
  • Magnets exhibit impressive magnetic induction on the active area,
  • 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...
  • Thanks to freedom in forming and the ability to modify to complex applications,
  • Huge importance in future technologies – they are used in data components, electric motors, medical equipment, also modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Information about lifting capacity was defined for the most favorable conditions, including:
  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • characterized by even structure
  • with zero gap (no paint)
  • during detachment in a direction vertical to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

It is worth knowing that the magnet holding will differ depending on elements below, starting with the most relevant:
  • Clearance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
ICD Warning

People with a pacemaker should maintain an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.

Maximum temperature

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Handling rules

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can react.

Keep away from computers

Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Beware of splinters

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets will cause them shattering into shards.

Impact on smartphones

Remember: neodymium magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.

Nickel coating and allergies

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, prevent direct skin contact or select coated magnets.

Keep away from children

Strictly keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.

Combustion hazard

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Finger safety

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

Attention! More info about hazards in the article: Safety of working with magnets.