Product available Ships today (order by 14:00)

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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165.00 ZŁ with VAT / pcs + price for transport

134.15 ZŁ net + 23% VAT / pcs

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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

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 product - data

Presented data are the outcome of a physical simulation. Values are based on algorithms for the class Nd₂Fe₁₄B. Actual conditions may deviate from the simulation results. Treat these data as a preliminary roadmap during assembly planning.

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

Grip strength drops significantly with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., contamination, paint, dust) significantly weakens the grip. Magnetic products hold optimally at the point of direct contact; air break weakens the power. Notice how rapidly the load capacity fall, when the magnet does not adhere directly to the steel surface. When planning the assembly, eliminate additional spacers.

Table 2: Sliding capacity (wall)
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 table below shows the theoretical weight limit sufficient to start the shifting of the magnet vertically along a upright steel wall (considering standard friction). The holding force varies with the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
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 mounting a element on a vertical surface (e.g., a car body), it will only hold barely about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient mean that magnets move down easier than they pop off the substrate. Designing a hanger? Note that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slide down under a much lighter load. Using a rubber pad can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
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 too thin steel is unable to absorb the full magnetic flux, which wastes potential of the magnet. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To achieve 100% of this magnet's power, you require a sufficiently solid element of metal. The saturation effect causes that on thin elements (e.g., appliance housings), the magnet works worse. We advise picking the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - 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

Classic neodymiums change their properties power after exceeding the maximum temperature. Avoid high temperatures – excessive heat can permanently destroy this product. With every degree above norm, the magnet's power momentarily lowers. Do not use this magnet close to ovens exceeding its operating temperature limit. Too high temperature will cause permanent loss of magnetism.

*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
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 magnets interact from a significantly greater distance than a neodymium and metal combination. The setup of two magnets produces a massive flux and a further horizon of performance. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).

Table 7: Protective zones (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
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

Extremely neodym field is a real danger to electronics and medical implants. These magnets generate a flux that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
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

Neodymium magnets are delicate – a strong collision with metal can result in shattering. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles 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)

The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. 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)

Flux value emitted by the magnet pole. Key data in coil applications and motors. The P_c coefficient determines the magnet's operating point.

Table 11: Submerged application
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

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

2. Steel thickness impact

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

3. Temperature resistance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (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 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

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%

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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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. This product with a force of 58.67 kg works great as a door latch, speaker holder, or spacer 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. 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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.

This model is characterized by dimensions Ø62x25 mm and a weight of 306.31 g. The key parameter here is the lifting capacity amounting to approximately 58.67 kg (force ~575.60 N). 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of neodymium magnets.

Strengths

Apart from their superior magnetism, neodymium magnets have these key benefits:

They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
Neodymium magnets are remarkably resistant to magnetic field loss caused by external field sources,
Thanks to the smooth finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an professional appearance,
The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
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...
Considering the option of flexible shaping and adaptation to unique requirements, magnetic components can be modeled in a variety of forms and dimensions, which makes them more universal,
Fundamental importance in electronics industry – they are used in hard drives, brushless drives, medical equipment, also industrial machines.
Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Characteristics of disadvantages of neodymium magnets and proposals for their use:

At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
Limited ability of producing threads in the magnet and complex forms - recommended is casing - magnetic holder.
Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these devices can complicate diagnosis medical in case of swallowing.
With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Holding force of 58.67 kg is a theoretical maximum value executed under the following configuration:

with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
possessing a thickness of at least 10 mm to avoid saturation
with a plane cleaned and smooth
under conditions of gap-free contact (metal-to-metal)
during detachment in a direction perpendicular to the plane
in neutral thermal conditions

Practical aspects of lifting capacity – factors

Bear in mind that the application force may be lower subject to the following factors, in order of importance:

Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Material composition – not every steel reacts the same. Alloy additives weaken the attraction effect.
Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas 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 holding force.

Safe handling of neodymium magnets

Permanent damage

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Warning for heart patients

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Adults only

Absolutely keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are life-threatening.

Combustion hazard

Powder created during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Risk of cracking

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Keep away from electronics

A strong magnetic field negatively affects the operation of compasses in phones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.

Nickel allergy

Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, prevent direct skin contact or opt for encased magnets.

Physical harm

Large magnets can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.

Powerful field

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

Electronic hazard

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Warning! Details about hazards in the article: Magnet Safety Guide.

MP 62x42x25 / N38 - ring magnet

Product card - MP 62x42x25 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the product - data

Table 1: Static force (force vs gap) - characteristics MP 62x42x25 / N38

Table 2: Sliding capacity (wall) MP 62x42x25 / N38

Table 3: Wall mounting (sliding) - vertical pull MP 62x42x25 / N38

Table 4: Steel thickness (saturation) - sheet metal selection MP 62x42x25 / N38

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

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

Table 7: Protective zones (electronics) - precautionary measures MP 62x42x25 / N38

Table 8: Dynamics (cracking risk) - collision effects MP 62x42x25 / N38

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

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

Table 11: Submerged application MP 62x42x25 / N38

1. Vertical hold

2. Steel thickness impact

3. Temperature resistance

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

Material specification

Sustainability

Force (pull)

Field Strength

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Pros and cons of neodymium magnets.

Strengths

Weaknesses

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Practical aspects of lifting capacity – factors

Safe handling of neodymium magnets

Permanent damage

Warning for heart patients

Adults only

Combustion hazard

Risk of cracking

Keep away from electronics

Nickel allergy

Physical harm

Powerful field

Electronic hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - characteristics
MP 62x42x25 / N38

Table 2: Sliding capacity (wall)
MP 62x42x25 / N38

Table 3: Wall mounting (sliding) - vertical pull
MP 62x42x25 / N38

Table 4: Steel thickness (saturation) - sheet metal selection
MP 62x42x25 / N38

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

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

Table 7: Protective zones (electronics) - precautionary measures
MP 62x42x25 / N38

Table 8: Dynamics (cracking risk) - collision effects
MP 62x42x25 / N38

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

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

Table 11: Submerged application
MP 62x42x25 / N38