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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

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165.00 ZŁ with VAT / pcs + price for transport

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Product card - 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

Technical modeling of the magnet - technical parameters

The following data constitute the result of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Actual performance may differ from theoretical values. Use these calculations as a reference point for designers.

Table 1: Static force (force vs gap) - characteristics
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 pounds
58670.0 g / 575.6 N
 critical level
1 mm 4338 Gs
433.8 mT
 55.21 kg / 121.72 pounds
55213.2 g / 541.6 N
 critical level
2 mm 4201 Gs
420.1 mT
 51.77 kg / 114.13 pounds
51768.5 g / 507.8 N
 critical level
3 mm 4061 Gs
406.1 mT
 48.39 kg / 106.69 pounds
48394.9 g / 474.8 N
 critical level
5 mm 3781 Gs
378.1 mT
 41.94 kg / 92.47 pounds
41942.4 g / 411.5 N
 critical level
10 mm 3097 Gs
309.7 mT
 28.15 kg / 62.06 pounds
28148.0 g / 276.1 N
 critical level
15 mm 2485 Gs
248.5 mT
 18.12 kg / 39.94 pounds
18118.5 g / 177.7 N
 critical level
20 mm 1972 Gs
197.2 mT
 11.41 kg / 25.16 pounds
11412.7 g / 112.0 N
 critical level
30 mm 1239 Gs
123.9 mT
 4.51 kg / 9.93 pounds
4505.2 g / 44.2 N
 strong
50 mm 533 Gs
53.3 mT
 0.83 kg / 1.84 pounds
832.4 g / 8.2 N
 safe
Magnetic force weakens sharply per each millimeter of gap. Keep in mind that even a very thin break (e.g., contamination, paint, rust) noticeably weakens the grip. Magnets work optimally at the point of direct contact; gap weakens the force. Observe how flashily the parameters fall, when the magnet does not touch tightly to the steel surface. When planning the arrangement, avoid additional spacers.

Table 2: Shear 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 pounds
11734.0 g / 115.1 N
1 mm Stal (~0.2) 11.04 kg / 24.34 pounds
11042.0 g / 108.3 N
2 mm Stal (~0.2) 10.35 kg / 22.83 pounds
10354.0 g / 101.6 N
3 mm Stal (~0.2) 9.68 kg / 21.34 pounds
9678.0 g / 94.9 N
5 mm Stal (~0.2) 8.39 kg / 18.49 pounds
8388.0 g / 82.3 N
10 mm Stal (~0.2) 5.63 kg / 12.41 pounds
5630.0 g / 55.2 N
15 mm Stal (~0.2) 3.62 kg / 7.99 pounds
3624.0 g / 35.6 N
20 mm Stal (~0.2) 2.28 kg / 5.03 pounds
2282.0 g / 22.4 N
30 mm Stal (~0.2) 0.90 kg / 1.99 pounds
902.0 g / 8.8 N
50 mm Stal (~0.2) 0.17 kg / 0.37 pounds
166.0 g / 1.6 N
The following data defines the approximate force sufficient to initiate the slippage of the magnet vertically against a vertical steel wall (assuming standard friction coefficient). This value varies with the distance between the magnet and the surface.

Table 3: Wall mounting (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 pounds
17601.0 g / 172.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
11.73 kg / 25.87 pounds
11734.0 g / 115.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
5.87 kg / 12.93 pounds
5867.0 g / 57.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
29.34 kg / 64.67 pounds
29335.0 g / 287.8 N
When mounting a magnet on a upright plane (e.g., a fridge), it you can count on barely approx. 1/5 of its nominal power. Gravitational force and a weak degree of grip influence the fact that holders move down easier than they pull off. Planning a hanger? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a significantly smaller cargo. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 62x42x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 1.96 kg / 4.31 pounds
1955.7 g / 19.2 N
1 mm
8%
 4.89 kg / 10.78 pounds
4889.2 g / 48.0 N
2 mm
17%
 9.78 kg / 21.56 pounds
9778.3 g / 95.9 N
3 mm
25%
 14.67 kg / 32.34 pounds
14667.5 g / 143.9 N
5 mm
42%
 24.45 kg / 53.89 pounds
24445.8 g / 239.8 N
10 mm
83%
 48.89 kg / 107.79 pounds
48891.7 g / 479.6 N
11 mm
92%
 53.78 kg / 118.57 pounds
53780.8 g / 527.6 N
12 mm
100%
 58.67 kg / 129.35 pounds
58670.0 g / 575.6 N
A thin metal plate cannot absorb the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the holding will be smaller. To utilize full efficiency of this magnet's potential, you require a sufficiently solid piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the product works worse. We advise picking the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - 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 pounds
58670.0 g / 575.6 N
 OK
40 °C -2.2% 57.38 kg / 126.50 pounds
57379.3 g / 562.9 N
 OK
60 °C -4.4% 56.09 kg / 123.65 pounds
56088.5 g / 550.2 N
 OK
80 °C -6.6% 54.80 kg / 120.81 pounds
54797.8 g / 537.6 N
100 °C -28.8% 41.77 kg / 92.09 pounds
41773.0 g / 409.8 N
Classic neodymiums lose power after exceeding the maximum temperature. Watch out for overheating – heat can irreversibly damage this product. With every degree above norm, the neodymium's power temporarily lowers. Do not use this magnet close to heaters higher than its working range. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field range
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 pounds
5 588 Gs
39.74 kg / 87.61 pounds
39740 g / 389.8 N
 N/A
1 mm 257.19 kg / 567.00 pounds
8 812 Gs
38.58 kg / 85.05 pounds
38578 g / 378.4 N
 231.47 kg / 510.30 pounds
~0 Gs
2 mm 249.32 kg / 549.66 pounds
8 676 Gs
37.40 kg / 82.45 pounds
37398 g / 366.9 N
 224.39 kg / 494.69 pounds
~0 Gs
3 mm 241.51 kg / 532.44 pounds
8 539 Gs
36.23 kg / 79.87 pounds
36227 g / 355.4 N
 217.36 kg / 479.19 pounds
~0 Gs
5 mm 226.10 kg / 498.47 pounds
8 262 Gs
33.92 kg / 74.77 pounds
33915 g / 332.7 N
 203.49 kg / 448.62 pounds
~0 Gs
10 mm 189.40 kg / 417.55 pounds
7 562 Gs
28.41 kg / 62.63 pounds
28409 g / 278.7 N
 170.46 kg / 375.79 pounds
~0 Gs
20 mm 127.11 kg / 280.22 pounds
6 195 Gs
19.07 kg / 42.03 pounds
19066 g / 187.0 N
 114.40 kg / 252.20 pounds
~0 Gs
50 mm 32.28 kg / 71.17 pounds
3 122 Gs
4.84 kg / 10.68 pounds
4843 g / 47.5 N
 29.06 kg / 64.06 pounds
~0 Gs
60 mm 20.34 kg / 44.85 pounds
2 478 Gs
3.05 kg / 6.73 pounds
3052 g / 29.9 N
 18.31 kg / 40.36 pounds
~0 Gs
70 mm 12.99 kg / 28.63 pounds
1 980 Gs
1.95 kg / 4.29 pounds
1948 g / 19.1 N
 11.69 kg / 25.77 pounds
~0 Gs
80 mm 8.43 kg / 18.59 pounds
1 595 Gs
1.26 kg / 2.79 pounds
1265 g / 12.4 N
 7.59 kg / 16.73 pounds
~0 Gs
90 mm 5.58 kg / 12.29 pounds
1 298 Gs
0.84 kg / 1.84 pounds
836 g / 8.2 N
 5.02 kg / 11.06 pounds
~0 Gs
100 mm 3.76 kg / 8.29 pounds
1 065 Gs
0.56 kg / 1.24 pounds
564 g / 5.5 N
 3.38 kg / 7.46 pounds
~0 Gs
Two strong neodymiums interact from a much further distance than a neodymium and metal setup. The setup of two magnets generates a stronger field and a wider radius of performance. Want to build a strong closure? Use a pair of magnets instead of one magnet and a steel. Remember that when bringing together two magnets, the pinch force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Important: Results apply to shear force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
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
Mobile device 40 Gs (4.0 mT) 15.5 cm
Car key 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
Extremely neodym field is a real danger to electronic devices and pacemakers. These magnets generate a field that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and housings. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
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 prone to chipping – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. 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 almost guarantees destruction of the neodymium. Wear safety glasses when working with large magnets.

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. Note the thickness of the protective layer.

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 magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Heat tolerance

*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
Elemental analysis
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
Force (pull)
Magnetic Induction
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The ring magnet with a hole MP 62x42x25 / N38 is created for mechanical fastening, where glue might fail or be insufficient. 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 too much pressure 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø62 mm (outer diameter) and height 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. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Neodymium magnets prove to be remarkably resistant to magnetic field loss caused by external interference,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets are characterized by huge magnetic induction on the outer side,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of individual creating and modifying to complex needs,
  • Universal use in electronics industry – they find application in hard drives, electromotive mechanisms, medical devices, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity was determined for optimal configuration, assuming:
  • using a sheet made of mild steel, serving as a ideal flux conductor
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

It is worth knowing that the application force may be lower depending on the following factors, in order of importance:
  • Gap (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Temperature – heating the magnet results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate reduces the holding force.

H&S for magnets
Nickel coating and allergies

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or opt for versions in plastic housing.

Product not for children

Strictly store magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are tragic.

Life threat

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Data carriers

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Crushing risk

Big blocks can break fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

Respect the power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Impact on smartphones

Navigation devices and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.

Mechanical processing

Powder produced during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Demagnetization risk

Do not overheat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Material brittleness

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

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