Product available Ships today (order by 14:00)

MP 25x8x5 / 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 030196

GTIN/EAN: 5906301812135

5.00

Load capacity 7.16 kg / 70.21 N Magnetic Induction 230.20 mT / 2302 Gs

Diameter: 25 mm [±0,1 mm]
internal diameter Ø: 8 mm [±0,1 mm]
Height: 5 mm [±0,1 mm]
Weight: 16.52 g
Magnetization Direction: ↑ axial
Coating: [NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical parameters »

4.80 zł net / pcs

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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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Physical properties - MP 25x8x5 / N38 - ring magnet

Specification / characteristics - MP 25x8x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030196
GTIN/EAN	5906301812135
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	8 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	16.52 g
Magnetization Direction	↑ axial
Load capacity ~ ?	7.16 kg / 70.21 N
Magnetic Induction ~ ?	230.20 mT / 2302 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x8x5 / 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 analysis of the product - technical parameters

The following values constitute the direct effect of a engineering calculation. Results are based on models for the material Nd₂Fe₁₄B. Real-world conditions might slightly deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MP 25x8x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	5777 Gs 577.7 mT	7.16 kg / 15.79 pounds 7160.0 g / 70.2 N	strong
1 mm	5310 Gs 531.0 mT	6.05 kg / 13.33 pounds 6048.6 g / 59.3 N	strong
2 mm	4846 Gs 484.6 mT	5.04 kg / 11.10 pounds 5036.9 g / 49.4 N	strong
3 mm	4397 Gs 439.7 mT	4.15 kg / 9.15 pounds 4148.2 g / 40.7 N	strong
5 mm	3576 Gs 357.6 mT	2.74 kg / 6.05 pounds 2743.2 g / 26.9 N	strong
10 mm	2073 Gs 207.3 mT	0.92 kg / 2.03 pounds 921.6 g / 9.0 N	safe
15 mm	1231 Gs 123.1 mT	0.33 kg / 0.72 pounds 325.2 g / 3.2 N	safe
20 mm	773 Gs 77.3 mT	0.13 kg / 0.28 pounds 128.0 g / 1.3 N	safe
30 mm	356 Gs 35.6 mT	0.03 kg / 0.06 pounds 27.2 g / 0.3 N	safe
50 mm	115 Gs 11.5 mT	0.00 kg / 0.01 pounds 2.8 g / 0.0 N	safe

Magnetic force decreases drastically per each millimeter of gap. Remember that even the smallest gap (e.g., dirt, paint, dust) noticeably weakens the grip. Magnets operate strongest at the point of direct contact; gap nullifies the power. Observe how quickly the pull force plummet, when the magnet does not adhere directly to the steel surface. When designing the arrangement, eliminate redundant distances.

Table 2: Slippage load (wall)
MP 25x8x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	1.43 kg / 3.16 pounds 1432.0 g / 14.0 N
1 mm	Stal (~0.2)	1.21 kg / 2.67 pounds 1210.0 g / 11.9 N
2 mm	Stal (~0.2)	1.01 kg / 2.22 pounds 1008.0 g / 9.9 N
3 mm	Stal (~0.2)	0.83 kg / 1.83 pounds 830.0 g / 8.1 N
5 mm	Stal (~0.2)	0.55 kg / 1.21 pounds 548.0 g / 5.4 N
10 mm	Stal (~0.2)	0.18 kg / 0.41 pounds 184.0 g / 1.8 N
15 mm	Stal (~0.2)	0.07 kg / 0.15 pounds 66.0 g / 0.6 N
20 mm	Stal (~0.2)	0.03 kg / 0.06 pounds 26.0 g / 0.3 N
30 mm	Stal (~0.2)	0.01 kg / 0.01 pounds 6.0 g / 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 pounds 0.0 g / 0.0 N

This section calculates the approximate weight limit needed to initiate the slippage of the magnet down against a upright steel wall (considering standard friction). This parameter depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x8x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.15 kg / 4.74 pounds 2148.0 g / 21.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.43 kg / 3.16 pounds 1432.0 g / 14.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.72 kg / 1.58 pounds 716.0 g / 7.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.58 kg / 7.89 pounds 3580.0 g / 35.1 N

When hanging a holder on a upright wall (e.g., a fridge), it will only hold just approx. 20%-30% of its nominal power. Gravity as well as a low friction coefficient cause that products move down easier than they detach. Designing a vertical fastening? Remember that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a significantly smaller load. Utilizing a rubberized pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x8x5 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.72 kg / 1.58 pounds 716.0 g / 7.0 N
1 mm	25%	1.79 kg / 3.95 pounds 1790.0 g / 17.6 N
2 mm	50%	3.58 kg / 7.89 pounds 3580.0 g / 35.1 N
3 mm	75%	5.37 kg / 11.84 pounds 5370.0 g / 52.7 N
5 mm	100%	7.16 kg / 15.79 pounds 7160.0 g / 70.2 N
10 mm	100%	7.16 kg / 15.79 pounds 7160.0 g / 70.2 N
11 mm	100%	7.16 kg / 15.79 pounds 7160.0 g / 70.2 N
12 mm	100%	7.16 kg / 15.79 pounds 7160.0 g / 70.2 N

A too thin steel is not enough to take in the entire magnetic field, which wastes potential of the holder. Should you attach a powerful product to a thin surface, the field will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you need a suitably thick element of steel. The saturation effect means that on delicate walls (e.g., thin profiles), the product shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - thermal limit
MP 25x8x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	7.16 kg / 15.79 pounds 7160.0 g / 70.2 N	OK
40 °C	-2.2%	7.00 kg / 15.44 pounds 7002.5 g / 68.7 N	OK
60 °C	-4.4%	6.84 kg / 15.09 pounds 6845.0 g / 67.1 N	OK
80 °C	-6.6%	6.69 kg / 14.74 pounds 6687.4 g / 65.6 N
100 °C	-28.8%	5.10 kg / 11.24 pounds 5097.9 g / 50.0 N

Ordinary NdFeB products change their properties parameters above the temperature limit. Protect against heat – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's capacity temporarily decreases. Do not use this magnet in hot environments exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetic properties.

*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures than long magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MP 25x8x5 / N38

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

Two magnets attract each other from a wider radius than a neodymium and metal combination. The setup of magnet-to-magnet produces a massive flux and a wider radius of operation. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the impact force is massive. The levitation is marginally weaker than the attraction, but still large.
*Field value in repulsion mode reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Results show friction force of two matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MP 25x8x5 / 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
Mechanical watch	20 Gs (2.0 mT)	10.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	8.0 cm
Car key	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

Powerful magnet radiation is a real danger to IT equipment and pacemakers. These neodymiums produce a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field penetrates the body and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MP 25x8x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.16 km/h (6.15 m/s)	0.31 J
30 mm	23.67 km/h (6.58 m/s)	0.36 J
50 mm	23.74 km/h (6.59 m/s)	0.36 J
100 mm	23.75 km/h (6.60 m/s)	0.36 J

Magnetic elements are prone to chipping – a violent impact against metal causes immediate chipping. Control the attraction moment – a neodymium left loose becomes dangerous. Kinetic force can trigger coating fragments or injury to skin. Be sure to control the product during mounting so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MP 25x8x5 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (P_c)
MP 25x8x5 / N38

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

Total magnetic flux emitted by the pole surface. Key data when building generators as well as sensors. P_c value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 25x8x5 / N38

Environment	Effective steel pull	Effect
Air (land)	7.16 kg	Standard
Water (riverbed)	8.20 kg (+1.04 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.

In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Caution: On a vertical surface, the magnet holds only ~20% of its nominal pull.

2. Steel saturation

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

3. Temperature resistance

*For standard magnets, the safety limit 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.

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%

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: 030196-2026

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MPL 5x4x1 / N38 - lamellar magnet

0.1845 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 easy screwing to wood, wall, plastic, or metal. This product with a force of 7.16 kg works great as a door latch, speaker holder, or mounting element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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. 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 8 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 (25 mm), so it doesn't protrude beyond the outline.

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 7.16 kg, which translates to 70.21 N in newtons. The mounting hole diameter is precisely 8 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages as well as disadvantages of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:

They retain magnetic properties for around ten years – the loss is just ~1% (based on simulations),
They maintain their magnetic properties even under close interference source,
In other words, due to the glossy layer of silver, the element gains a professional look,
Magnets are distinguished by impressive magnetic induction on the surface,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
Thanks to flexibility in designing and the ability to customize to individual projects,
Fundamental importance in innovative solutions – they serve a role in mass storage devices, motor assemblies, medical devices, also multitasking production systems.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets: tips and applications.

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
We suggest casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

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

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:

using a sheet made of mild steel, functioning as a magnetic yoke
whose thickness reaches at least 10 mm
with a surface perfectly flat
without any insulating layer between the magnet and steel
during detachment in a direction vertical to the plane
at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

Please note that the magnet holding will differ subject to elements below, starting with the most relevant:

Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets

Respect the power

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Do not drill into magnets

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Data carriers

Do not bring magnets near a wallet, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Serious injuries

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

No play value

Only for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Avoid contact if allergic

Certain individuals suffer from a contact allergy to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause a rash. It is best to wear safety gloves.

Protective goggles

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

GPS Danger

Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Medical interference

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Heat warning

Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and strength.

Security! Want to know more? Read our article: Are neodymium magnets dangerous?

MP 25x8x5 / N38 - ring magnet

Physical properties - MP 25x8x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - technical parameters

Table 1: Static pull force (pull vs distance) - characteristics MP 25x8x5 / N38

Table 2: Slippage load (wall) MP 25x8x5 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MP 25x8x5 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MP 25x8x5 / N38

Table 5: Working in heat (material behavior) - thermal limit MP 25x8x5 / N38

Table 6: Two magnets (attraction) - forces in the system MP 25x8x5 / N38

Table 7: Hazards (electronics) - precautionary measures MP 25x8x5 / N38

Table 8: Impact energy (kinetic energy) - warning MP 25x8x5 / N38

Table 9: Corrosion resistance MP 25x8x5 / N38

Table 10: Electrical data (Pc) MP 25x8x5 / N38

Table 11: Hydrostatics and buoyancy MP 25x8x5 / N38

1. Sliding resistance

2. Steel saturation

3. Temperature resistance

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

Elemental analysis

Environmental data

Pulling force

Magnetic Field

See also deals

SMZR 32x225 / N52 - magnetic separator with handle

MPL 25x15x2 / N38 - lamellar magnet

UMGZ 32x18x8 [M6] GZ / N38 - magnetic holder external thread

MPL 5x4x1 / N38 - lamellar magnet

Advantages as well as disadvantages of rare earth magnets.

Advantages

Limitations

Holding force characteristics

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

Determinants of practical lifting force of a magnet

Safe handling of neodymium magnets

Respect the power

Do not drill into magnets

Data carriers

Serious injuries

No play value

Avoid contact if allergic

Protective goggles

GPS Danger

Medical interference

Heat warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs distance) - characteristics
MP 25x8x5 / N38

Table 2: Slippage load (wall)
MP 25x8x5 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x8x5 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x8x5 / N38

Table 5: Working in heat (material behavior) - thermal limit
MP 25x8x5 / N38

Table 6: Two magnets (attraction) - forces in the system
MP 25x8x5 / N38

Table 7: Hazards (electronics) - precautionary measures
MP 25x8x5 / N38

Table 8: Impact energy (kinetic energy) - warning
MP 25x8x5 / N38

Table 9: Corrosion resistance
MP 25x8x5 / N38

Table 10: Electrical data (P_c)
MP 25x8x5 / N38

Table 11: Hydrostatics and buoyancy
MP 25x8x5 / N38