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MP 25x12.5x5 / N38 - ring magnet

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

ring magnet

Catalog no 030342

GTIN/EAN: 5906301812289

5.00

Load capacity 5.98 kg / 58.64 N Magnetic Induction 230.20 mT / 2302 Gs

Diameter: 25 mm [±0,1 mm]
internal diameter Ø: 12.5 mm [±0,1 mm]
Height: 5 mm [±0,1 mm]
Weight: 13.81 g
Magnetization Direction: ↑ axial
Coating: [NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Frequently asked questions

What is the hole in a ring magnet for?

For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.

What is the polarisation?

Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.

What sizes are available?

Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

Guides from the knowledge base

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical data - MP 25x12.5x5 / N38 - ring magnet

Specification / characteristics - MP 25x12.5x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030342
GTIN/EAN	5906301812289
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	25 mm [±0,1 mm]
internal diameter Ø	12.5 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	13.81 g
Magnetization Direction	↑ axial
Load capacity ~ ?	5.98 kg / 58.64 N
Magnetic Induction ~ ?	230.20 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x12.5x5 / N38 - ring magnet

properties	values	units
Remanence Br ?	12.2-12.6	kGs
Remanence Br ?	1220-1260	mT
Coercivity bHc ?	10.8-11.5	kOe
Coercivity bHc ?	860-915	kA/m
Intrinsic coercivity iHc	≥ 12	kOe
Intrinsic coercivity iHc	≥ 955	kA/m
Energy product BHmax ?	36-38	BH max MGOe
Energy product BHmax ?	287-303	BH max KJ/m
Maximum working 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	310	°C
Curie Temperature TF	590	°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 simulation of the assembly - data

The following data constitute the direct effect of a mathematical simulation. Results are based on models for the class Nd₂Fe₁₄B. Actual performance may differ from theoretical values. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - interaction chart
MP 25x12.5x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N	warning
1 mm	5310 Gs 531.0 mT	5.05 kg / 11.14 LBS 5051.8 g / 49.6 N	warning
2 mm	4846 Gs 484.6 mT	4.21 kg / 9.27 LBS 4206.8 g / 41.3 N	warning
3 mm	4397 Gs 439.7 mT	3.46 kg / 7.64 LBS 3464.5 g / 34.0 N	warning
5 mm	3576 Gs 357.6 mT	2.29 kg / 5.05 LBS 2291.1 g / 22.5 N	warning
10 mm	2073 Gs 207.3 mT	0.77 kg / 1.70 LBS 769.7 g / 7.6 N	weak grip
15 mm	1231 Gs 123.1 mT	0.27 kg / 0.60 LBS 271.6 g / 2.7 N	weak grip
20 mm	773 Gs 77.3 mT	0.11 kg / 0.24 LBS 106.9 g / 1.0 N	weak grip
30 mm	356 Gs 35.6 mT	0.02 kg / 0.05 LBS 22.7 g / 0.2 N	weak grip
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 LBS 2.4 g / 0.0 N	weak grip

Grip strength drops drastically per each millimeter of gap. Note that even a very thin break (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnets operate most effectively at the point of direct contact; air break kills the force. Observe how rapidly the load capacity fall, when the product does not touch directly to the steel surface. When planning the arrangement, avoid unnecessary gaps.

Table 2: Slippage load (vertical surface)
MP 25x12.5x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.20 kg / 2.64 LBS 1196.0 g / 11.7 N
1 mm	Stal (~0.2)	1.01 kg / 2.23 LBS 1010.0 g / 9.9 N
2 mm	Stal (~0.2)	0.84 kg / 1.86 LBS 842.0 g / 8.3 N
3 mm	Stal (~0.2)	0.69 kg / 1.53 LBS 692.0 g / 6.8 N
5 mm	Stal (~0.2)	0.46 kg / 1.01 LBS 458.0 g / 4.5 N
10 mm	Stal (~0.2)	0.15 kg / 0.34 LBS 154.0 g / 1.5 N
15 mm	Stal (~0.2)	0.05 kg / 0.12 LBS 54.0 g / 0.5 N
20 mm	Stal (~0.2)	0.02 kg / 0.05 LBS 22.0 g / 0.2 N
30 mm	Stal (~0.2)	0.00 kg / 0.01 LBS 4.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 LBS 0.0 g / 0.0 N

This section defines the estimated weight limit necessary to initiate the sliding of the magnet vertically on a vertical steel plate (assuming typical friction coefficient). The holding force is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 25x12.5x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.79 kg / 3.96 LBS 1794.0 g / 17.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.20 kg / 2.64 LBS 1196.0 g / 11.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.60 kg / 1.32 LBS 598.0 g / 5.9 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	2.99 kg / 6.59 LBS 2990.0 g / 29.3 N

When hanging a holder on a vertical wall (e.g., a car body), it will only hold barely about 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that magnets slide down faster than they pull off. Want to create a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a painted metal, the holder will slip down under a much lighter weight. Utilizing a rubberized layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 25x12.5x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.60 kg / 1.32 LBS 598.0 g / 5.9 N
1 mm	25%	1.50 kg / 3.30 LBS 1495.0 g / 14.7 N
2 mm	50%	2.99 kg / 6.59 LBS 2990.0 g / 29.3 N
3 mm	75%	4.49 kg / 9.89 LBS 4485.0 g / 44.0 N
5 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N
10 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N
11 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N
12 mm	100%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N

A too thin steel is not enough to take in the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a weak sheet, the field will pass right through and the holding will be smaller. To achieve 100% of this magnet's potential, you require a sufficiently solid backing of metal. The material oversaturation causes that on delicate walls (e.g., thin profiles), the holder works worse. We advise picking the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - resistance threshold
MP 25x12.5x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	5.98 kg / 13.18 LBS 5980.0 g / 58.7 N	OK
40 °C	-2.2%	5.85 kg / 12.89 LBS 5848.4 g / 57.4 N	OK
60 °C	-4.4%	5.72 kg / 12.60 LBS 5716.9 g / 56.1 N	OK
80 °C	-6.6%	5.59 kg / 12.31 LBS 5585.3 g / 54.8 N
100 °C	-28.8%	4.26 kg / 9.39 LBS 4257.8 g / 41.8 N

Standard neodymium magnets irreversibly lose parameters past the thermal threshold. Watch out for overheating – excessive heat can irreversibly damage this product. As the temperature rises, the magnet's capacity momentarily lowers. Avoid using this product in hot environments exceeding its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetism.

*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) may lose charge permanently under lower heat stress than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MP 25x12.5x5 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Lateral Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	82.42 kg / 181.72 LBS 6 082 Gs	12.36 kg / 27.26 LBS 12364 g / 121.3 N	N/A
1 mm	75.95 kg / 167.44 LBS 11 091 Gs	11.39 kg / 25.12 LBS 11392 g / 111.8 N	68.35 kg / 150.69 LBS ~0 Gs
2 mm	69.63 kg / 153.51 LBS 10 620 Gs	10.44 kg / 23.03 LBS 10445 g / 102.5 N	62.67 kg / 138.16 LBS ~0 Gs
3 mm	63.64 kg / 140.29 LBS 10 153 Gs	9.55 kg / 21.04 LBS 9545 g / 93.6 N	57.27 kg / 126.26 LBS ~0 Gs
5 mm	52.69 kg / 116.16 LBS 9 238 Gs	7.90 kg / 17.42 LBS 7903 g / 77.5 N	47.42 kg / 104.54 LBS ~0 Gs
10 mm	31.58 kg / 69.62 LBS 7 152 Gs	4.74 kg / 10.44 LBS 4737 g / 46.5 N	28.42 kg / 62.66 LBS ~0 Gs
20 mm	10.61 kg / 23.39 LBS 4 145 Gs	1.59 kg / 3.51 LBS 1591 g / 15.6 N	9.55 kg / 21.05 LBS ~0 Gs
50 mm	0.65 kg / 1.43 LBS 1 024 Gs	0.10 kg / 0.21 LBS 97 g / 1.0 N	0.58 kg / 1.28 LBS ~0 Gs
60 mm	0.31 kg / 0.69 LBS 712 Gs	0.05 kg / 0.10 LBS 47 g / 0.5 N	0.28 kg / 0.62 LBS ~0 Gs
70 mm	0.16 kg / 0.36 LBS 514 Gs	0.02 kg / 0.05 LBS 24 g / 0.2 N	0.15 kg / 0.32 LBS ~0 Gs
80 mm	0.09 kg / 0.20 LBS 383 Gs	0.01 kg / 0.03 LBS 14 g / 0.1 N	0.08 kg / 0.18 LBS ~0 Gs
90 mm	0.05 kg / 0.12 LBS 293 Gs	0.01 kg / 0.02 LBS 8 g / 0.1 N	0.05 kg / 0.11 LBS ~0 Gs
100 mm	0.03 kg / 0.07 LBS 230 Gs	0.00 kg / 0.01 LBS 5 g / 0.0 N	0.03 kg / 0.06 LBS ~0 Gs

Two magnets attract each other from a wider radius than a magnet and sheet combination. The connection of two magnets creates a more powerful interaction and a further horizon of performance. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is extreme. The levitation is a bit weaker than the attraction, but still significant.
*The magnetic induction between like poles drops to ~0 Gs at the midpoint of the gap (due to field cancellation).
Important: Figures demonstrate sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - warnings
MP 25x12.5x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	17.0 cm
Hearing aid	10 Gs (1.0 mT)	13.5 cm
Timepiece	20 Gs (2.0 mT)	10.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	8.0 cm
Remote	50 Gs (5.0 mT)	7.5 cm
Payment card	400 Gs (40.0 mT)	3.0 cm
HDD hard drive	600 Gs (60.0 mT)	2.5 cm

Extremely neodym field poses a real danger to electronic devices as well as medical implants. These magnets generate a field that prevents correct functioning of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MP 25x12.5x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.15 km/h (6.15 m/s)	0.26 J
30 mm	23.66 km/h (6.57 m/s)	0.30 J
50 mm	23.73 km/h (6.59 m/s)	0.30 J
100 mm	23.74 km/h (6.59 m/s)	0.30 J

Magnetic elements are very brittle – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MP 25x12.5x5 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MP 25x12.5x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	24 536 Mx	245.4 µWb
P_c Coefficient	1.03	High (Stable)

Total magnetic flux passing through the pole surface. Essential parameter when building generators as well as sensors. P_c value defines the magnet's operating point.

Table 11: Submerged application
MP 25x12.5x5 / N38

Environment	Effective steel pull	Effect
Air (land)	5.98 kg	Standard
Water (riverbed)	6.85 kg (+0.87 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.

The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Shear force

*Note: On a vertical wall, the magnet holds merely a fraction of its max power.

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 material, 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) = 1.03

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.

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%

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: 030342-2026

Measurement Calculator

Magnet pull force

Newtons (N)

Pounds (lbs)

Field Strength

Induction (Gs)

Induction (T)

Insert a value into a field, and all other values will update on the fly.

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UMH 42x9x46 [M6] / N38 - magnetic holder with hook

35.99 zł brutto / pcs

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. It is also often used in advertising for fixing signs and in workshops for organizing tools.

This is a crucial issue when working with model MP 25x12.5x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain great sensitivity. 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.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building 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. 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.

The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 5 mm. The pulling force of this model is an impressive 5.98 kg, which translates to 58.64 N in newtons. The mounting hole diameter is precisely 12.5 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.

Strengths as well as weaknesses of rare earth magnets.

Pros

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

They do not lose power, even during approximately ten years – the drop in strength is only ~1% (theoretically),
They retain their magnetic properties even under close interference source,
Thanks to the smooth finish, the layer of nickel, gold, or silver gives an professional appearance,
Magnetic induction on the working layer of the magnet is very high,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
Possibility of custom forming as well as adjusting to complex applications,
Fundamental importance in advanced technology sectors – they are used in magnetic memories, brushless drives, medical devices, also complex engineering applications.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:

Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
Due to limitations in creating threads and complicated shapes in magnets, we propose using a housing - magnetic holder.
Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
Due to neodymium price, their price is higher than average,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, taking into account:

with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
whose transverse dimension reaches at least 10 mm
characterized by smoothness
under conditions of gap-free contact (surface-to-surface)
for force acting at a right angle (in the magnet axis)
in stable room temperature

What influences lifting capacity in practice

It is worth knowing that the magnet holding will differ subject to elements below, in order of importance:

Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Plate material – mild steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
Surface finish – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

H&S for magnets

Adults only

Product intended for adults. Small elements can be swallowed, causing severe trauma. Store out of reach of children and animals.

Fire risk

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Bone fractures

Large magnets can break fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.

Life threat

People with a pacemaker have to keep an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.

Heat warning

Keep cool. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Electronic hazard

Intense magnetic fields can erase data on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Eye protection

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Compass and GPS

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Allergic reactions

Studies show that nickel (standard magnet coating) is a potent allergen. If you have an allergy, refrain from direct skin contact and select coated magnets.

Conscious usage

Handle magnets consciously. Their huge power can shock even professionals. Stay alert and do not underestimate their force.

Danger! Need more info? Check our post: Are neodymium magnets dangerous?

MP 25x12.5x5 / N38 - ring magnet

Technical data - MP 25x12.5x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - data

Table 1: Static pull force (pull vs distance) - interaction chart MP 25x12.5x5 / N38

Table 2: Slippage load (vertical surface) MP 25x12.5x5 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces MP 25x12.5x5 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection MP 25x12.5x5 / N38

Table 5: Thermal stability (material behavior) - resistance threshold MP 25x12.5x5 / N38

Table 6: Two magnets (repulsion) - field range MP 25x12.5x5 / N38

Table 7: Safety (HSE) (implants) - warnings MP 25x12.5x5 / N38

Table 8: Impact energy (cracking risk) - collision effects MP 25x12.5x5 / N38

Table 9: Surface protection spec MP 25x12.5x5 / N38

Table 10: Construction data (Flux) MP 25x12.5x5 / N38

Table 11: Submerged application MP 25x12.5x5 / N38

1. Shear force

2. Efficiency vs thickness

3. Heat tolerance

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

Material specification

Sustainability

Magnet pull force

Field Strength

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UMGGZ 43x6 [M6] GZ / N38 - rubber magnetic holder external thread

NCM 20x13.5x5 / N38 - channel magnetic holder

UMH 42x9x46 [M6] / N38 - magnetic holder with hook

Strengths as well as weaknesses of rare earth magnets.

Pros

Cons

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

What influences lifting capacity in practice

H&S for magnets

Adults only

Fire risk

Bone fractures

Life threat

Heat warning

Electronic hazard

Eye protection

Compass and GPS

Allergic reactions

Conscious usage

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs distance) - interaction chart
MP 25x12.5x5 / N38

Table 2: Slippage load (vertical surface)
MP 25x12.5x5 / N38

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 25x12.5x5 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 25x12.5x5 / N38

Table 5: Thermal stability (material behavior) - resistance threshold
MP 25x12.5x5 / N38

Table 6: Two magnets (repulsion) - field range
MP 25x12.5x5 / N38

Table 7: Safety (HSE) (implants) - warnings
MP 25x12.5x5 / N38

Table 8: Impact energy (cracking risk) - collision effects
MP 25x12.5x5 / N38

Table 9: Surface protection spec
MP 25x12.5x5 / N38

Table 10: Construction data (Flux)
MP 25x12.5x5 / N38

Table 11: Submerged application
MP 25x12.5x5 / N38