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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

165.00 with VAT / pcs + price for transport

134.15 ZŁ net + 23% VAT / pcs

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Technical of the product - 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 simulation of the assembly - report

The following data represent the result of a physical simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - 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
crushing
1 mm 4338 Gs
433.8 mT
55.21 kg / 121.72 pounds
55213.2 g / 541.6 N
crushing
2 mm 4201 Gs
420.1 mT
51.77 kg / 114.13 pounds
51768.5 g / 507.8 N
crushing
3 mm 4061 Gs
406.1 mT
48.39 kg / 106.69 pounds
48394.9 g / 474.8 N
crushing
5 mm 3781 Gs
378.1 mT
41.94 kg / 92.47 pounds
41942.4 g / 411.5 N
crushing
10 mm 3097 Gs
309.7 mT
28.15 kg / 62.06 pounds
28148.0 g / 276.1 N
crushing
15 mm 2485 Gs
248.5 mT
18.12 kg / 39.94 pounds
18118.5 g / 177.7 N
crushing
20 mm 1972 Gs
197.2 mT
11.41 kg / 25.16 pounds
11412.7 g / 112.0 N
crushing
30 mm 1239 Gs
123.9 mT
4.51 kg / 9.93 pounds
4505.2 g / 44.2 N
medium risk
50 mm 533 Gs
53.3 mT
0.83 kg / 1.84 pounds
832.4 g / 8.2 N
weak grip

Table 2: Slippage load (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

Table 3: Wall mounting (shearing) - 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

Table 4: Material efficiency (substrate influence) - 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 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

Table 5: Thermal resistance (stability) - power drop
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

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 62x42x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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

Table 7: Protective zones (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
Mechanical watch 20 Gs (2.0 mT) 20.0 cm
Mobile device 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

Table 8: Collisions (kinetic energy) - 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

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)

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)

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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds merely ~20% of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Temperature resistance

*For N38 grade, 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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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%
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: 030205-2026
Magnet Unit Converter
Force (pull)

Magnetic Field

Other deals

The ring magnet with a hole MP 62x42x25 / N38 is created for permanent mounting, where glue might fail or be insufficient. 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. The flat screw head should evenly press the magnet. 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 is not sufficient for rain. 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 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. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø62x25 mm and a weight of 306.31 g. The pulling force of this model is an impressive 58.67 kg, which translates to 575.60 N in newtons. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of rare earth magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by external field influence,
  • Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold, or silver gives an elegant appearance,
  • Magnets exhibit huge magnetic induction on the outer side,
  • 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...
  • Possibility of accurate machining as well as adapting to complex conditions,
  • Wide application in future technologies – they are utilized in data components, electric motors, medical equipment, as well as multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their strength 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 usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat it depends on?

The force parameter is a theoretical maximum value performed under specific, ideal conditions:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • with direct contact (no coatings)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Determinants of lifting force in real conditions

In real-world applications, the actual lifting capacity results from several key aspects, presented from the most important:
  • Air gap (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safe handling of NdFeB magnets
Heat warning

Keep cool. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Pinching danger

Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Health Danger

Warning for patients: Powerful magnets affect electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Nickel coating and allergies

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

GPS Danger

A strong magnetic field interferes with the operation of compasses in phones and navigation systems. Maintain magnets near a device to avoid damaging the sensors.

Product not for children

Only for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Mechanical processing

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

Safe distance

Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Protective goggles

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Caution required

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Danger! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98