Product available Ships tomorrow

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

see properties »

165.00 ZŁ with VAT / pcs + price for transport

134.15 ZŁ net + 23% VAT / pcs

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Force as well as shape of neodymium magnets can be estimated with our magnetic mass calculator.

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Technical data 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

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 modeling of the magnet - report

The following data represent the result of a mathematical analysis. Results rely on models for the class Nd₂Fe₁₄B. Actual performance might slightly deviate from the simulation results. Please consider these data as a supplementary guide when designing systems.

Table 1: Static pull 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	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	low risk

Pulling power decreases sharply with every subsequent millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Magnets work strongest at the point of direct contact; gap kills the force. See how quickly the pull force fall, when the magnet does not adhere directly to the steel surface. When designing the arrangement, discard additional spacers.

Table 2: Shear load (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 necessary to start the sliding of the magnet downwards on a upright steel plate (considering standard friction). The holding force is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (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 hanging a element on a upright wall (e.g., a car body), it will only hold just about 20%-30% of nominal attraction strength. Gravitational force and a low friction coefficient mean that holders move down easier than they pop off the substrate. Designing a vertical fastening? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a significantly smaller weight. Application of an anti-slip pad can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - 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 take in the entire magnetic field, which wastes potential of the holder. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To achieve 100% of this neodymium's potential, you need a suitably thick element of steel. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the product works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
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 irreversibly lose power above the temperature limit. Watch out for overheating – heat can permanently demagnetize this product. As the temperature rises, the neodymium's capacity momentarily decreases. Do not use this magnet near heat sources exceeding its working range. Too high temperature will result in irreversible degradation of magnetism.

*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - 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 strong neodymiums interact from a significantly greater distance than a magnet and sheet combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of performance. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the collision energy is huge. The levitation is a bit weaker than the attraction, but still large.
*Field value for N-N configuration drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Hazards (electronics) - 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

A strong magnetic field is a real danger to electronic devices and medical implants. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Special caution must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

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

Neodymium magnets are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or painful pinches to skin. Always hold the magnet during mounting 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 eye protection when handling with powerful specimens.

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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction 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 emitted by the pole surface. Key data in coil applications and motors. The P_c coefficient defines the working geometry.

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%

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. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Note: On a vertical surface, the magnet retains just ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 material, 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

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 and environmental data

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: 030205-2025

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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 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. 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.

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 inside building 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. 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.

It is a magnetic ring with a diameter of 62 mm and thickness 25 mm. The key parameter here is the holding force amounting to approximately 58.67 kg (force ~575.60 N). The mounting hole diameter is precisely 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. 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 Nd₂Fe₁₄B magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:

They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
They are noted for resistance to demagnetization induced by presence of other magnetic fields,
Thanks to the metallic finish, the plating of nickel, gold-plated, or silver gives an aesthetic appearance,
They show high magnetic induction at the operating surface, making them more effective,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Considering the potential of precise forming and adaptation to unique needs, NdFeB magnets can be modeled in a broad palette of forms and dimensions, which amplifies use scope,
Significant place in advanced technology sectors – they are commonly used in HDD drives, electric drive systems, diagnostic systems, also other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Cons

Disadvantages of neodymium magnets:

They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
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
Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
Health risk resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these devices can disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Detachment force of the magnet in optimal conditions – what it depends on?

Holding force of 58.67 kg is a theoretical maximum value executed under standard conditions:

on a block made of structural steel, effectively closing the magnetic flux
with a thickness minimum 10 mm
with an polished touching surface
with direct contact (no paint)
during pulling in a direction vertical to the mounting surface
in stable room temperature

Determinants of lifting force in real conditions

Holding efficiency is affected by specific conditions, such as (from most important):

Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
Chemical composition of the base – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets

Danger to the youngest

Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Store away from kids and pets.

Finger safety

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Magnets are brittle

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets leads to them shattering into small pieces.

Medical interference

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Metal Allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.

Threat to electronics

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Dust explosion hazard

Powder generated during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Keep away from electronics

A powerful magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Conscious usage

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

Do not overheat magnets

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Caution! Want to know more? Check our post: Are neodymium magnets dangerous?

MP 62x42x25 / N38 - ring magnet

Technical data of the product - MP 62x42x25 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the magnet - report

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

Table 2: Shear load (vertical surface) MP 62x42x25 / N38

Table 3: Vertical assembly (sliding) - vertical pull MP 62x42x25 / N38

Table 4: Material efficiency (substrate influence) - power losses MP 62x42x25 / N38

Table 5: Working in heat (material behavior) - thermal limit MP 62x42x25 / N38

Table 6: Two magnets (repulsion) - field collision MP 62x42x25 / N38

Table 7: Hazards (electronics) - warnings MP 62x42x25 / N38

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

Table 9: Surface protection spec MP 62x42x25 / N38

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

Table 11: Submerged application MP 62x42x25 / N38

1. Shear force

2. Efficiency vs thickness

3. Power loss vs temp

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

Elemental analysis

Environmental data

Magnet pull force

Magnetic Field

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Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Cons

Pull force analysis

Detachment force of the magnet in optimal conditions – what it depends on?

Determinants of lifting force in real conditions

Safety rules for work with neodymium magnets

Danger to the youngest

Finger safety

Magnets are brittle

Medical interference

Metal Allergy

Threat to electronics

Dust explosion hazard

Keep away from electronics

Conscious usage

Do not overheat magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Shear load (vertical surface)
MP 62x42x25 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MP 62x42x25 / N38

Table 4: Material efficiency (substrate influence) - power losses
MP 62x42x25 / N38

Table 5: Working in heat (material behavior) - thermal limit
MP 62x42x25 / N38

Table 6: Two magnets (repulsion) - field collision
MP 62x42x25 / N38

Table 7: Hazards (electronics) - warnings
MP 62x42x25 / N38

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

Table 9: Surface protection spec
MP 62x42x25 / N38

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

Table 11: Submerged application
MP 62x42x25 / N38

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.