Product available Ships today (order by 14:00)

MP 12x8/4x3 / 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: PLN 1-6500
Rating: 5

ring magnet

Catalog no 030395

GTIN/EAN: 5906301812326

5.00

Diameter

12 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

2.26 g

Magnetization Direction

↑ axial

Load capacity

2.21 kg / 21.72 N

Magnetic Induction

277.09 mT / 2771 Gs

Coating

[NiCuNi] Nickel

product specifications »

1.427 ZŁ with VAT / pcs + price for transport

1.160 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

1.160 ZŁ

1.427 ZŁ

price from 550 pcs

1.090 ZŁ

1.341 ZŁ

price from 2200 pcs

1.021 ZŁ

1.256 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Looking for a better price?

Give us a call +48 22 499 98 98 otherwise drop us a message via form the contact section.
Force as well as appearance of a neodymium magnet can be estimated on our modular calculator.

Orders submitted before 14:00 will be dispatched today!

Detailed specification - MP 12x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 12x8/4x3 / N38 - ring magnet

properties

properties	values
Cat. no.	030395
GTIN/EAN	5906301812326
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	12 mm [±0,1 mm]
internal diameter Ø	8/4 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	2.26 g
Magnetization Direction	↑ axial
Load capacity ~ ?	2.21 kg / 21.72 N
Magnetic Induction ~ ?	277.09 mT / 2771 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 12x8/4x3 / 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 simulation of the assembly - technical parameters

Presented data are the outcome of a mathematical simulation. Results rely on models for the class Nd₂Fe₁₄B. Actual parameters may differ from theoretical values. Treat these data as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - power drop
MP 12x8/4x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	2423 Gs 242.3 mT	2.21 kg / 4.87 lbs 2210.0 g / 21.7 N	medium risk
1 mm	2138 Gs 213.8 mT	1.72 kg / 3.79 lbs 1720.7 g / 16.9 N	weak grip
2 mm	1786 Gs 178.6 mT	1.20 kg / 2.65 lbs 1200.5 g / 11.8 N	weak grip
3 mm	1437 Gs 143.7 mT	0.78 kg / 1.71 lbs 777.8 g / 7.6 N	weak grip
5 mm	885 Gs 88.5 mT	0.29 kg / 0.65 lbs 294.7 g / 2.9 N	weak grip
10 mm	277 Gs 27.7 mT	0.03 kg / 0.06 lbs 28.9 g / 0.3 N	weak grip
15 mm	110 Gs 11.0 mT	0.00 kg / 0.01 lbs 4.6 g / 0.0 N	weak grip
20 mm	53 Gs 5.3 mT	0.00 kg / 0.00 lbs 1.1 g / 0.0 N	weak grip
30 mm	18 Gs 1.8 mT	0.00 kg / 0.00 lbs 0.1 g / 0.0 N	weak grip
50 mm	4 Gs 0.4 mT	0.00 kg / 0.00 lbs 0.0 g / 0.0 N	weak grip

Grip strength drops significantly with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) strongly reduces the pull force. Magnetic products hold strongest during direct contact; distance nullifies the power. Notice how quickly the pull force drop, when the magnet does not adhere directly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Slippage force (vertical surface)
MP 12x8/4x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.44 kg / 0.97 lbs 442.0 g / 4.3 N
1 mm	Stal (~0.2)	0.34 kg / 0.76 lbs 344.0 g / 3.4 N
2 mm	Stal (~0.2)	0.24 kg / 0.53 lbs 240.0 g / 2.4 N
3 mm	Stal (~0.2)	0.16 kg / 0.34 lbs 156.0 g / 1.5 N
5 mm	Stal (~0.2)	0.06 kg / 0.13 lbs 58.0 g / 0.6 N
10 mm	Stal (~0.2)	0.01 kg / 0.01 lbs 6.0 g / 0.1 N
15 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 g / 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 g / 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 g / 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.00 lbs 0.0 g / 0.0 N

The following data shows the theoretical holding capacity required to initiate the downward movement of the magnet downwards against a upright metal surface (considering typical friction coefficient). This value varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MP 12x8/4x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.66 kg / 1.46 lbs 663.0 g / 6.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.44 kg / 0.97 lbs 442.0 g / 4.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.22 kg / 0.49 lbs 221.0 g / 2.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.11 kg / 2.44 lbs 1105.0 g / 10.8 N

When hanging a magnet on a upright wall (e.g., a board), it will only hold just about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient mean that magnets slide down faster than they pull off. Designing a vertical fastening? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the magnet will slide down under a much lighter cargo. Application of an anti-slip pad can effectively raise the stability.

Table 4: Material efficiency (saturation) - power losses
MP 12x8/4x3 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.22 kg / 0.49 lbs 221.0 g / 2.2 N
1 mm	25%	0.55 kg / 1.22 lbs 552.5 g / 5.4 N
2 mm	50%	1.11 kg / 2.44 lbs 1105.0 g / 10.8 N
3 mm	75%	1.66 kg / 3.65 lbs 1657.5 g / 16.3 N
5 mm	100%	2.21 kg / 4.87 lbs 2210.0 g / 21.7 N
10 mm	100%	2.21 kg / 4.87 lbs 2210.0 g / 21.7 N
11 mm	100%	2.21 kg / 4.87 lbs 2210.0 g / 21.7 N
12 mm	100%	2.21 kg / 4.87 lbs 2210.0 g / 21.7 N

A thin sheet is incapable of conduct the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the flux will penetrate right through and the attraction force will be weaker. To utilize the maximum of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (stability) - power drop
MP 12x8/4x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	2.21 kg / 4.87 lbs 2210.0 g / 21.7 N	OK
40 °C	-2.2%	2.16 kg / 4.77 lbs 2161.4 g / 21.2 N	OK
60 °C	-4.4%	2.11 kg / 4.66 lbs 2112.8 g / 20.7 N
80 °C	-6.6%	2.06 kg / 4.55 lbs 2064.1 g / 20.2 N
100 °C	-28.8%	1.57 kg / 3.47 lbs 1573.5 g / 15.4 N

Ordinary NdFeB products lose power past the thermal threshold. Watch out for overheating – high temperature can irreversibly destroy this product. With increasing heat, the neodymium's capacity temporarily decreases. Do not use this magnet near heat sources higher than its safe range. Exceeding the critical threshold will cause permanent loss of magnetism.

*Important note: Heat tolerance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 12x8/4x3 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Sliding Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	3.09 kg / 6.82 lbs 4 010 Gs	0.46 kg / 1.02 lbs 464 g / 4.6 N	N/A
1 mm	2.77 kg / 6.12 lbs 4 589 Gs	0.42 kg / 0.92 lbs 416 g / 4.1 N	2.50 kg / 5.50 lbs ~0 Gs
2 mm	2.41 kg / 5.31 lbs 4 276 Gs	0.36 kg / 0.80 lbs 361 g / 3.5 N	2.17 kg / 4.78 lbs ~0 Gs
3 mm	2.03 kg / 4.48 lbs 3 930 Gs	0.31 kg / 0.67 lbs 305 g / 3.0 N	1.83 kg / 4.04 lbs ~0 Gs
5 mm	1.36 kg / 3.00 lbs 3 216 Gs	0.20 kg / 0.45 lbs 204 g / 2.0 N	1.23 kg / 2.70 lbs ~0 Gs
10 mm	0.41 kg / 0.91 lbs 1 770 Gs	0.06 kg / 0.14 lbs 62 g / 0.6 N	0.37 kg / 0.82 lbs ~0 Gs
20 mm	0.04 kg / 0.09 lbs 554 Gs	0.01 kg / 0.01 lbs 6 g / 0.1 N	0.04 kg / 0.08 lbs ~0 Gs
50 mm	0.00 kg / 0.00 lbs 58 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
60 mm	0.00 kg / 0.00 lbs 35 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
70 mm	0.00 kg / 0.00 lbs 23 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
80 mm	0.00 kg / 0.00 lbs 16 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
90 mm	0.00 kg / 0.00 lbs 11 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs
100 mm	0.00 kg / 0.00 lbs 8 Gs	0.00 kg / 0.00 lbs 0 g / 0.0 N	0.00 kg / 0.00 lbs ~0 Gs

Two magnetic products interact from a significantly greater distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is huge. The levitation is a bit weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
* Calculations show shear force of two matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - warnings
MP 12x8/4x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	5.0 cm
Hearing aid	10 Gs (1.0 mT)	4.0 cm
Timepiece	20 Gs (2.0 mT)	3.0 cm
Mobile device	40 Gs (4.0 mT)	2.5 cm
Car key	50 Gs (5.0 mT)	2.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Extremely neodym field is a serious hazard to electronic devices as well as pacemakers. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation penetrates the body and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MP 12x8/4x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	31.79 km/h (8.83 m/s)	0.09 J
30 mm	54.63 km/h (15.17 m/s)	0.26 J
50 mm	70.52 km/h (19.59 m/s)	0.43 J
100 mm	99.73 km/h (27.70 m/s)	0.87 J

Neodymium magnets are very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product 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. Wear safety glasses when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 12x8/4x3 / 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: Electrical data (P_c)
MP 12x8/4x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	2 466 Mx	24.7 µWb
P_c Coefficient	0.32	Low (Flat)

Flux value passing through the magnet pole. Essential parameter in coil applications and motors. The P_c coefficient defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 12x8/4x3 / N38

Environment	Effective steel pull	Effect
Air (land)	2.21 kg	Standard
Water (riverbed)	2.53 kg (+0.32 kg buoyancy gain)	+14.5%

Rust risk: 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. Sliding resistance

*Note: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.32

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%

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: 030395-2026

Measurement Calculator

Magnet pull force

Force (N)

Force in lbs

Field Strength

Type your figure in any box, to see the rest convert in real-time.

Other products

Product available Ships today (order by 14:00)

MPL 30x10x8 / N38 - lamellar magnet

10.71 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MP 25x8x20 / N38 - ring magnet

41.71 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread

33.95 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 16x9 / N38 - cylindrical magnet

7.36 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 2.21 kg works great as a cabinet closure, speaker holder, or mounting element in devices.

This is a crucial issue when working with model MP 12x8/4x3 / 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 rubber spacer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.

These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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. If you must use it outside, paint it with anti-corrosion paint after mounting.

A screw or bolt with a thread diameter smaller than 8/4 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. Aesthetic mounting requires selecting the appropriate head size.

This model is characterized by dimensions Ø12x3 mm and a weight of 2.26 g. The pulling force of this model is an impressive 2.21 kg, which translates to 21.72 N in newtons. The mounting hole diameter is precisely 8/4 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.

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:

They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
They are extremely resistant to demagnetization induced by external field influence,
The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
They are known for high magnetic induction at the operating surface, which affects their effectiveness,
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...
Thanks to freedom in shaping and the ability to customize to individual projects,
Significant place in future technologies – they serve a role in hard drives, brushless drives, medical devices, and other advanced devices.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:

At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
We suggest cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these products are able to complicate diagnosis medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The load parameter shown represents the maximum value, obtained under optimal environment, namely:

with the use of a sheet made of low-carbon steel, guaranteeing maximum field concentration
possessing a thickness of at least 10 mm to avoid saturation
with a surface cleaned and smooth
under conditions of no distance (surface-to-surface)
under perpendicular force direction (90-degree angle)
at temperature room level

What influences lifting capacity in practice

In real-world applications, the actual lifting capacity results from a number of factors, presented from the most important:

Clearance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Steel type – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Warnings

Threat to electronics

Data protection: Strong magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Beware of splinters

Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them shattering into shards.

Finger safety

Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

GPS and phone interference

Be aware: rare earth magnets generate a field that interferes with precision electronics. Maintain a separation from your mobile, device, and navigation systems.

Fire risk

Powder produced during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Thermal limits

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its properties and strength.

Caution required

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Skin irritation risks

Studies show that nickel (standard magnet coating) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands or choose versions in plastic housing.

Choking Hazard

Only for adults. Small elements pose a choking risk, causing intestinal necrosis. Keep away from kids and pets.

ICD Warning

Warning for patients: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Attention! More info about hazards in the article: Magnet Safety Guide.

MP 12x8/4x3 / N38 - ring magnet

Detailed specification - MP 12x8/4x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - technical parameters

Table 1: Static force (force vs gap) - power drop MP 12x8/4x3 / N38

Table 2: Slippage force (vertical surface) MP 12x8/4x3 / N38

Table 3: Vertical assembly (sliding) - vertical pull MP 12x8/4x3 / N38

Table 4: Material efficiency (saturation) - power losses MP 12x8/4x3 / N38

Table 5: Thermal resistance (stability) - power drop MP 12x8/4x3 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision MP 12x8/4x3 / N38

Table 7: Hazards (electronics) - warnings MP 12x8/4x3 / N38

Table 8: Dynamics (cracking risk) - warning MP 12x8/4x3 / N38

Table 9: Anti-corrosion coating durability MP 12x8/4x3 / N38

Table 10: Electrical data (Pc) MP 12x8/4x3 / N38

Table 11: Underwater work (magnet fishing) MP 12x8/4x3 / N38

1. Sliding resistance

2. Steel saturation

3. Power loss vs temp

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

Material specification

Environmental data

Magnet pull force

Field Strength

Other products

MPL 30x10x8 / N38 - lamellar magnet

MP 25x8x20 / N38 - ring magnet

UMGW 42x20x9 [M6] GW / N38 - magnetic holder internal thread

MW 16x9 / N38 - cylindrical magnet

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Weaknesses

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

What influences lifting capacity in practice

Warnings

Threat to electronics

Beware of splinters

Finger safety

GPS and phone interference

Fire risk

Thermal limits

Caution required

Skin irritation risks

Choking Hazard

ICD Warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - power drop
MP 12x8/4x3 / N38

Table 2: Slippage force (vertical surface)
MP 12x8/4x3 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MP 12x8/4x3 / N38

Table 4: Material efficiency (saturation) - power losses
MP 12x8/4x3 / N38

Table 5: Thermal resistance (stability) - power drop
MP 12x8/4x3 / N38

Table 6: Magnet-Magnet interaction (attraction) - field collision
MP 12x8/4x3 / N38

Table 7: Hazards (electronics) - warnings
MP 12x8/4x3 / N38

Table 8: Dynamics (cracking risk) - warning
MP 12x8/4x3 / N38

Table 9: Anti-corrosion coating durability
MP 12x8/4x3 / N38

Table 10: Electrical data (P_c)
MP 12x8/4x3 / N38

Table 11: Underwater work (magnet fishing)
MP 12x8/4x3 / N38

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.