Product available Ships tomorrow

MP 12x8/4x3 / 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
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

check technical 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

Want to talk magnets?

Pick up the phone and ask +48 22 499 98 98 otherwise contact us by means of form our website.
Weight as well as form of magnets can be tested on our our magnetic calculator.

Same-day processing for orders placed before 14:00.

Technical data of the product - 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

Engineering modeling of the assembly - data

Presented data constitute the result of a mathematical calculation. Results were calculated on models for the class Nd₂Fe₁₄B. Operational parameters might slightly differ from theoretical values. Please consider these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - interaction chart
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	warning
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

Pulling power drops drastically with every mm of gap. Keep in mind that even a microscopic distance (e.g., contamination, varnish, rust) noticeably diminishes the holding power. Magnetic products hold strongest at the point of direct contact; gap drastically cuts the force. Observe how rapidly the load capacity drop, when the product does not adhere tightly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Shear capacity (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

This section calculates the approximate shear load needed to cause the slippage of the magnet down on a upright steel plate (assuming typical friction). This value is relative to the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
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 vertical plane (e.g., a fridge), it will maintain just about 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip mean that holders move down faster than they detach. Designing a wall mount? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a significantly smaller load. Application of an anti-slip layer can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 not enough to focus the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To achieve full efficiency of this magnet's potential, you need a suitably thick backing of steel. The saturation phenomenon causes that on delicate walls (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - 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

Standard neodymium magnets lose parameters after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently demagnetize this magnet. With every degree above norm, the magnet's capacity momentarily lowers. Avoid using this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will cause irreversible degradation of magnetic properties.

*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 12x8/4x3 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Shear 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 attract each other from a much further distance than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of operation. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is huge. The levitation is slightly lower than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Calculations apply to friction force of two matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
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
Remote	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

Powerful magnet radiation is a large risk to electronic devices and pacemakers. These NdFeB products generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation acts through matter and housings. Special caution must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (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

NdFeB products are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can cause material chips or painful pinches to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when working with large magnets.

Table 9: Corrosion resistance
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)

The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
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 pole surface. Key data when building generators as well as sensors. The P_c coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%

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

Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Sliding resistance

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*For N38 grade, the safety limit 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

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%

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: 030395-2026

Quick Unit Converter

Pulling force

Force (N)

lbs

Magnetic Field

Tesla (T)

Input your value in a single slot to generate results for the other units right away.

Check out more products

Product available Ships tomorrow

MW 6x3 / N38 - cylindrical magnet

0.381 ZŁ brutto / pcs

Product available Ships tomorrow

MPL 30x20x10 / N38 - lamellar magnet

16.11 ZŁ brutto / pcs

Product available Ships tomorrow

BM 750x180x70 [4x M8] - magnetic beam

6914.94 ZŁ brutto / pcs

Product available Ships tomorrow

MW 5x10 / N38 - cylindrical magnet

0.800 ZŁ brutto / pcs

The ring-shaped magnet MP 12x8/4x3 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. 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 12x8/4x3 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain caution. 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 does not ensure full waterproofing. 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 rubberized holders 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. Always check that the screw head is not larger than the outer diameter of the magnet (12 mm), so it doesn't protrude beyond the outline.

It is a magnetic ring with a diameter of 12 mm and thickness 3 mm. The pulling force of this model is an impressive 2.21 kg, which translates to 21.72 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 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.

Strengths and weaknesses of Nd₂Fe₁₄B magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

Their magnetic field remains stable, and after approximately 10 years it drops only by ~1% (theoretically),
They maintain their magnetic properties even under external field action,
A magnet with a smooth nickel surface is more attractive,
Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
Possibility of custom creating as well as adapting to atypical applications,
Significant place in modern industrial fields – they are used in hard drives, electric motors, medical equipment, also complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Weaknesses

Disadvantages of neodymium magnets:

They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
Limited ability of creating threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these devices can be problematic in diagnostics medical in case of swallowing.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

Holding force of 2.21 kg is a result of laboratory testing performed under the following configuration:

on a block made of structural steel, effectively closing the magnetic flux
with a thickness no less than 10 mm
with a plane free of scratches
without the slightest insulating layer between the magnet and steel
for force applied at a right angle (in the magnet axis)
in temp. approx. 20°C

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by working environment parameters, such as (from most important):

Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
Plate material – low-carbon steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets

Allergy Warning

Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease handling magnets and use protective gear.

Bone fractures

Protect your hands. Two powerful magnets will join instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Magnets are brittle

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Maximum temperature

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Danger to pacemakers

People with a pacemaker must keep an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

No play value

Adult use only. Tiny parts pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Machining danger

Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Safe operation

Exercise caution. Rare earth magnets act from a distance and connect with massive power, often quicker than you can move away.

Impact on smartphones

A powerful magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Do not bring magnets close to a smartphone to avoid breaking the sensors.

Keep away from computers

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Attention! Looking for details? Read our article: Why are neodymium magnets dangerous?

MP 12x8/4x3 / N38 - ring magnet

Technical data of the product - MP 12x8/4x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the assembly - data

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

Table 2: Shear capacity (vertical surface) MP 12x8/4x3 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MP 12x8/4x3 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection MP 12x8/4x3 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - forces in the system MP 12x8/4x3 / N38

Table 7: Hazards (implants) - precautionary measures MP 12x8/4x3 / N38

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

Table 9: Corrosion resistance MP 12x8/4x3 / N38

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

Table 11: Hydrostatics and buoyancy MP 12x8/4x3 / N38

1. Sliding resistance

2. Steel thickness impact

3. Thermal stability

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

Elemental analysis

Sustainability

Pulling force

Magnetic Field

Check out more products

MW 6x3 / N38 - cylindrical magnet

MPL 30x20x10 / N38 - lamellar magnet

BM 750x180x70 [4x M8] - magnetic beam

MW 5x10 / N38 - cylindrical magnet

Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

Weaknesses

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

Practical lifting capacity: influencing factors

Safety rules for work with NdFeB magnets

Allergy Warning

Bone fractures

Magnets are brittle

Maximum temperature

Danger to pacemakers

No play value

Machining danger

Safe operation

Impact on smartphones

Keep away from computers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

Table 2: Shear capacity (vertical surface)
MP 12x8/4x3 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 12x8/4x3 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 12x8/4x3 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 12x8/4x3 / N38

Table 7: Hazards (implants) - precautionary measures
MP 12x8/4x3 / N38

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

Table 9: Corrosion resistance
MP 12x8/4x3 / N38

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

Table 11: Hydrostatics and buoyancy
MP 12x8/4x3 / N38

Strengths and weaknesses of Nd₂Fe₁₄B magnets.