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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 specification - 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

Physical analysis of the magnet - data

Presented values are the direct effect of a engineering calculation. Results rely on models for the class Nd2Fe14B. Actual parameters may deviate from the simulation results. Use these data as a reference point for designers.

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

Table 2: Vertical capacity (wall)
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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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

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 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

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 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

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 62x42x25 / N38

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

Table 7: Safety (HSE) (implants) - 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
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

Table 8: Impact energy (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: Surface protection spec
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 (Pc)
MP 62x42x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 100 906 Mx 1009.1 µWb
Pc Coefficient 0.64 High (Stable)

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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

*Note: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Power loss vs temp

*For standard magnets, the safety 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.

Engineering data and GPSR
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%
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
Measurement Calculator
Force (pull)

Field Strength

Other offers

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 quick installation to wood, wall, plastic, or metal. This product with a force of 58.67 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 62x42x25 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. 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. 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 magnets in hermetic housing 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. 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 mounting hole diameter is precisely 42 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. 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.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain full power for nearly 10 years – the drop is just ~1% (in theory),
  • They maintain their magnetic properties even under strong external field,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact machining as well as adapting to atypical applications,
  • Fundamental importance in electronics industry – they find application in HDD drives, electromotive mechanisms, medical equipment, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we propose using cover - magnetic mount.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Additionally, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum holding power of the magnet – what it depends on?

The declared magnet strength refers to the maximum value, obtained under laboratory conditions, meaning:
  • using a base made of low-carbon steel, serving as a ideal flux conductor
  • whose transverse dimension reaches at least 10 mm
  • with a surface perfectly flat
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction vertical to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Holding efficiency is influenced by specific conditions, mainly (from priority):
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Risk of cracking

Protect your eyes. Magnets can fracture upon violent connection, ejecting shards into the air. Wear goggles.

Product not for children

Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from kids and pets.

Respect the power

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

GPS Danger

Navigation devices and smartphones are highly susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Flammability

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Crushing risk

Large magnets can break fingers instantly. Under no circumstances place your hand between two attracting surfaces.

Warning for allergy sufferers

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease working with magnets and wear gloves.

Keep away from computers

Intense magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Stay away of min. 10 cm.

Health Danger

Individuals with a ICD must keep an safe separation from magnets. The magnetic field can disrupt the operation of the implant.

Operating temperature

Avoid heat. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Important! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98