Product available Ships in 2 days

MP 62x42x25 / N38 - ring magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

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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Technical parameters - 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

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 analysis of the product - data

These values represent the direct effect of a physical calculation. Results were calculated on algorithms for the material Nd₂Fe₁₄B. Operational parameters might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
MP 62x42x25 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4472 Gs 447.2 mT	58.67 kg / 58670.0 g 575.6 N	critical level
1 mm	4338 Gs 433.8 mT	55.21 kg / 55213.2 g 541.6 N	critical level
2 mm	4201 Gs 420.1 mT	51.77 kg / 51768.5 g 507.8 N	critical level
3 mm	4061 Gs 406.1 mT	48.39 kg / 48394.9 g 474.8 N	critical level
5 mm	3781 Gs 378.1 mT	41.94 kg / 41942.4 g 411.5 N	critical level
10 mm	3097 Gs 309.7 mT	28.15 kg / 28148.0 g 276.1 N	critical level
15 mm	2485 Gs 248.5 mT	18.12 kg / 18118.5 g 177.7 N	critical level
20 mm	1972 Gs 197.2 mT	11.41 kg / 11412.7 g 112.0 N	critical level
30 mm	1239 Gs 123.9 mT	4.51 kg / 4505.2 g 44.2 N	warning
50 mm	533 Gs 53.3 mT	0.83 kg / 832.4 g 8.2 N	safe

Pulling power drops sharply with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., dirt, varnish, dust) strongly reduces the pull force. Magnetic products hold strongest at the point of direct contact; air break nullifies the force. Notice how quickly the parameters fall, when the magnet does not touch directly to the metal substrate. When planning the mounting, discard additional spacers.

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

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	11.73 kg / 11734.0 g 115.1 N
1 mm	Stal (~0.2)	11.04 kg / 11042.0 g 108.3 N
2 mm	Stal (~0.2)	10.35 kg / 10354.0 g 101.6 N
3 mm	Stal (~0.2)	9.68 kg / 9678.0 g 94.9 N
5 mm	Stal (~0.2)	8.39 kg / 8388.0 g 82.3 N
10 mm	Stal (~0.2)	5.63 kg / 5630.0 g 55.2 N
15 mm	Stal (~0.2)	3.62 kg / 3624.0 g 35.6 N
20 mm	Stal (~0.2)	2.28 kg / 2282.0 g 22.4 N
30 mm	Stal (~0.2)	0.90 kg / 902.0 g 8.8 N
50 mm	Stal (~0.2)	0.17 kg / 166.0 g 1.6 N

The following data indicates the estimated shear load sufficient to cause the slippage of the magnet downwards on a upright steel plate (assuming standard friction coefficient). This value varies with the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 62x42x25 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	17.60 kg / 17601.0 g 172.7 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	11.73 kg / 11734.0 g 115.1 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	5.87 kg / 5867.0 g 57.6 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	29.34 kg / 29335.0 g 287.8 N

When hanging a element on a upright surface (e.g., a car body), it will maintain just about 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip influence the fact that products move down faster than they pop off the substrate. Want to create a hanger? Consider that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the element will slide down under a noticeably lighter weight. Utilizing a rubberized layer can significantly increase the grip.

Table 4: Steel thickness (saturation) - power losses
MP 62x42x25 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	1.96 kg / 1955.7 g 19.2 N
1 mm	8%	4.89 kg / 4889.2 g 48.0 N
2 mm	17%	9.78 kg / 9778.3 g 95.9 N
5 mm	42%	24.45 kg / 24445.8 g 239.8 N
10 mm	83%	48.89 kg / 48891.7 g 479.6 N

A thin sheet cannot focus the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a weak sheet, the field will pass right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of metal. The saturation phenomenon means that on thin elements (e.g., thin profiles), the product works worse. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - power drop
MP 62x42x25 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	58.67 kg / 58670.0 g 575.6 N	OK
40 °C	-2.2%	57.38 kg / 57379.3 g 562.9 N	OK
60 °C	-4.4%	56.09 kg / 56088.5 g 550.2 N	OK
80 °C	-6.6%	54.80 kg / 54797.8 g 537.6 N
100 °C	-28.8%	41.77 kg / 41773.0 g 409.8 N

Ordinary NdFeB products irreversibly lose strength above the temperature limit. Avoid high temperatures – heat can irreversibly demagnetize this magnet. With increasing heat, the neodymium's power briefly drops. Refrain from using this product close to ovens higher than its safe range. Ignoring the limit will result in destruction of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) risk losing magnetic properties under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

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

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	264.93 kg / 264931 g 2599.0 N 5 588 Gs	N/A
1 mm	257.19 kg / 257186 g 2523.0 N 8 812 Gs	231.47 kg / 231468 g 2270.7 N ~0 Gs
2 mm	249.32 kg / 249322 g 2445.8 N 8 676 Gs	224.39 kg / 224389 g 2201.3 N ~0 Gs
3 mm	241.51 kg / 241510 g 2369.2 N 8 539 Gs	217.36 kg / 217359 g 2132.3 N ~0 Gs
5 mm	226.10 kg / 226103 g 2218.1 N 8 262 Gs	203.49 kg / 203493 g 1996.3 N ~0 Gs
10 mm	189.40 kg / 189396 g 1858.0 N 7 562 Gs	170.46 kg / 170456 g 1672.2 N ~0 Gs
20 mm	127.11 kg / 127106 g 1246.9 N 6 195 Gs	114.40 kg / 114395 g 1122.2 N ~0 Gs
50 mm	32.28 kg / 32284 g 316.7 N 3 122 Gs	29.06 kg / 29056 g 285.0 N ~0 Gs

Two magnetic products interact from a significantly greater distance than a neodymium and metal combination. The setup of two magnets generates a stronger field and a larger range of operation. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*Field value for N-N configuration reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - 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
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

Powerful magnet radiation is a large risk to electronic devices and pacemakers. These neodymiums produce a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and housings. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MP 62x42x25 / N38

Start from (mm)	Speed (km/h)	Energy (J)
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

Magnetic elements are very brittle – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during installation 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. Wear safety glasses when playing 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (P_c)
MP 62x42x25 / N38

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

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

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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

The magnetic field penetrates through water without any losses. 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 holds only approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

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

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient P_c (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 P_c (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 P_c 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%

Sustainability

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: 030205-2025

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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 quick installation to wood, wall, plastic, or metal. 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 is not sufficient for rain. 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.

The inner hole diameter determines the maximum size of the mounting element. 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.

The presented product is a ring magnet with dimensions Ø62 mm (outer diameter) and height 25 mm. 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.

These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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.

Advantages

Besides their tremendous strength, neodymium magnets offer the following advantages:

Their magnetic field is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
They have excellent resistance to magnetism drop due to external magnetic sources,
The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to look better,
Magnetic induction on the top side of the magnet remains very high,
Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to the possibility of accurate molding and adaptation to individualized projects, NdFeB magnets can be created in a broad palette of geometric configurations, which makes them more universal,
Universal use in future technologies – they are used in hard drives, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:

At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
Limited possibility of producing nuts in the magnet and complex forms - recommended is cover - magnet mounting.
Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:

with the contact of a sheet made of special test steel, ensuring maximum field concentration
with a cross-section no less than 10 mm
characterized by even structure
with direct contact (no paint)
during detachment in a direction vertical to the mounting surface
in temp. approx. 20°C

Lifting capacity in practice – influencing factors

During everyday use, the actual lifting capacity is determined by several key aspects, presented from most significant:

Distance (between the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and holding force.
Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Holding force was measured 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. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets

Crushing force

Pinching hazard: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Precision electronics

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

Skin irritation risks

Some people experience a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to dermatitis. It is best to wear protective gloves.

Warning for heart patients

For implant holders: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Choking Hazard

NdFeB magnets are not toys. Swallowing multiple magnets may result in them attracting across intestines, which constitutes a direct threat to life and necessitates immediate surgery.

Protect data

Device Safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Heat sensitivity

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Immense force

Exercise caution. Neodymium magnets act from a distance and connect with huge force, often quicker than you can move away.

Eye protection

NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them breaking into shards.

Fire warning

Dust produced during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Safety First! Looking for details? Read our article: Are neodymium magnets dangerous?

MP 62x42x25 / N38 - ring magnet

Technical parameters - MP 62x42x25 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the product - data

Table 1: Static force (force vs distance) - interaction chart MP 62x42x25 / N38

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

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MP 62x42x25 / N38

Table 4: Steel thickness (saturation) - power losses MP 62x42x25 / N38

Table 5: Thermal resistance (stability) - power drop MP 62x42x25 / N38

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

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

Table 8: Collisions (cracking risk) - warning MP 62x42x25 / N38

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

Table 10: Electrical data (Pc) MP 62x42x25 / N38

Table 11: Underwater work (magnet fishing) MP 62x42x25 / N38

1. Wall mount (shear)

2. Efficiency vs thickness

3. Temperature resistance

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

Elemental analysis

Sustainability

Force (pull)

Magnetic Field

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MPL 30x10x5 / N38 - lamellar magnet

Advantages as well as disadvantages of neodymium magnets.

Advantages

Weaknesses

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

Lifting capacity in practice – influencing factors

Safe handling of NdFeB magnets

Crushing force

Precision electronics

Skin irritation risks

Warning for heart patients

Choking Hazard

Protect data

Heat sensitivity

Immense force

Eye protection

Fire warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - interaction chart
MP 62x42x25 / N38

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

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 62x42x25 / N38

Table 4: Steel thickness (saturation) - power losses
MP 62x42x25 / N38

Table 5: Thermal resistance (stability) - power drop
MP 62x42x25 / N38

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

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

Table 8: Collisions (cracking risk) - warning
MP 62x42x25 / N38

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

Table 10: Electrical data (P_c)
MP 62x42x25 / N38

Table 11: Underwater work (magnet fishing)
MP 62x42x25 / N38