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MP 16x12x2 / N38 - ring magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

ring magnet

Catalog no 030183

GTIN/EAN: 5906301812005

5.00

Diameter

16 mm [±0,1 mm]

internal diameter Ø

12 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

1.32 g

Magnetization Direction

↑ axial

Load capacity

0.68 kg / 6.62 N

Magnetic Induction

150.33 mT / 1503 Gs

Coating

[NiCuNi] Nickel

1.304 ZŁ with VAT / pcs + price for transport

1.060 ZŁ net + 23% VAT / pcs

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MP 16x12x2 / N38 - ring magnet

Specification / characteristics MP 16x12x2 / N38 - ring magnet

properties

properties	values
Cat. no.	030183
GTIN/EAN	5906301812005
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	16 mm [±0,1 mm]
internal diameter Ø	12 mm [±0,1 mm]
Height	2 mm [±0,1 mm]
Weight	1.32 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.68 kg / 6.62 N
Magnetic Induction ~ ?	150.33 mT / 1503 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 16x12x2 / 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 magnet - report

Presented information represent the outcome of a engineering simulation. Results were calculated on algorithms for the material Nd₂Fe₁₄B. Actual conditions might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - power drop
MP 16x12x2 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6011 Gs 601.1 mT	0.68 kg / 680.0 g 6.7 N	low risk
1 mm	5259 Gs 525.9 mT	0.52 kg / 520.7 g 5.1 N	low risk
2 mm	4534 Gs 453.4 mT	0.39 kg / 387.0 g 3.8 N	low risk
3 mm	3870 Gs 387.0 mT	0.28 kg / 281.9 g 2.8 N	low risk
5 mm	2776 Gs 277.6 mT	0.15 kg / 145.1 g 1.4 N	low risk
10 mm	1251 Gs 125.1 mT	0.03 kg / 29.4 g 0.3 N	low risk
15 mm	643 Gs 64.3 mT	0.01 kg / 7.8 g 0.1 N	low risk
20 mm	372 Gs 37.2 mT	0.00 kg / 2.6 g 0.0 N	low risk
30 mm	159 Gs 15.9 mT	0.00 kg / 0.5 g 0.0 N	low risk
50 mm	49 Gs 4.9 mT	0.00 kg / 0.0 g 0.0 N	low risk

Grip strength weakens sharply per each millimeter of spacing. Keep in mind that every additional insulation layer (e.g., dirt, varnish, rust) noticeably weakens the grip. Magnets hold strongest during direct contact; air break kills the power. Observe how rapidly the pull force drop, when the product does not adhere tightly to the metal substrate. When calculating the assembly, eliminate additional spacers.

Table 2: Slippage hold (wall)
MP 16x12x2 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.14 kg / 136.0 g 1.3 N
1 mm	Stal (~0.2)	0.10 kg / 104.0 g 1.0 N
2 mm	Stal (~0.2)	0.08 kg / 78.0 g 0.8 N
3 mm	Stal (~0.2)	0.06 kg / 56.0 g 0.5 N
5 mm	Stal (~0.2)	0.03 kg / 30.0 g 0.3 N
10 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
15 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below calculates the estimated force necessary to start the slippage of the magnet downwards against a vertical metal surface (assuming typical friction). This value is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 16x12x2 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.20 kg / 204.0 g 2.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.14 kg / 136.0 g 1.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.07 kg / 68.0 g 0.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.34 kg / 340.0 g 3.3 N

When hanging a magnet on a upright surface (e.g., a board), it you can count on just approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip cause that products slip easier than they pull off. Designing a hanger? Note that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a noticeably lighter load. Using a rubber pad can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MP 16x12x2 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.07 kg / 68.0 g 0.7 N
1 mm	25%	0.17 kg / 170.0 g 1.7 N
2 mm	50%	0.34 kg / 340.0 g 3.3 N
5 mm	100%	0.68 kg / 680.0 g 6.7 N
10 mm	100%	0.68 kg / 680.0 g 6.7 N

A thin metal plate is not enough to conduct the entire magnetic field, which weakens actual performance of the magnet. Should you mount a strong magnet to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you need a suitably thick piece of metal. The material oversaturation causes that on delicate walls (e.g., appliance housings), the holder works worse. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MP 16x12x2 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.68 kg / 680.0 g 6.7 N	OK
40 °C	-2.2%	0.67 kg / 665.0 g 6.5 N	OK
60 °C	-4.4%	0.65 kg / 650.1 g 6.4 N	OK
80 °C	-6.6%	0.64 kg / 635.1 g 6.2 N
100 °C	-28.8%	0.48 kg / 484.2 g 4.7 N

Standard neodymium magnets lose parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can permanently damage this product. With increasing heat, the neodymium's force temporarily lowers. Refrain from using this product in hot environments higher than its operating temperature limit. Ignoring the limit will result in destruction of magnetism.

*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 16x12x2 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	37.47 kg / 37469 g 367.6 N 6 145 Gs	N/A
1 mm	32.95 kg / 32953 g 323.3 N 11 273 Gs	29.66 kg / 29657 g 290.9 N ~0 Gs
2 mm	28.69 kg / 28690 g 281.4 N 10 519 Gs	25.82 kg / 25821 g 253.3 N ~0 Gs
3 mm	24.81 kg / 24808 g 243.4 N 9 781 Gs	22.33 kg / 22327 g 219.0 N ~0 Gs
5 mm	18.24 kg / 18235 g 178.9 N 8 386 Gs	16.41 kg / 16412 g 161.0 N ~0 Gs
10 mm	7.99 kg / 7993 g 78.4 N 5 552 Gs	7.19 kg / 7194 g 70.6 N ~0 Gs
20 mm	1.62 kg / 1622 g 15.9 N 2 501 Gs	1.46 kg / 1460 g 14.3 N ~0 Gs
50 mm	0.06 kg / 57 g 0.6 N 471 Gs	0.05 kg / 52 g 0.5 N ~0 Gs

Two magnetic products interact from a wider radius than a magnet and steel combination. Such a system of magnet-to-magnet produces a massive flux and a wider radius of performance. Designing a strong closure? Apply two magnets instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Protective zones (implants) - warnings
MP 16x12x2 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	12.5 cm
Hearing aid	10 Gs (1.0 mT)	9.5 cm
Mechanical watch	20 Gs (2.0 mT)	7.5 cm
Mobile device	40 Gs (4.0 mT)	5.5 cm
Remote	50 Gs (5.0 mT)	5.0 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

A strong magnetic field poses a real danger to IT equipment as well as pacemakers. These NdFeB products produce a field that prevents correct functioning of digital equipment. Remember: the unseen radiation penetrates the body and glass. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MP 16x12x2 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	23.50 km/h (6.53 m/s)	0.03 J
30 mm	39.66 km/h (11.02 m/s)	0.08 J
50 mm	51.19 km/h (14.22 m/s)	0.13 J
100 mm	72.39 km/h (20.11 m/s)	0.27 J

NdFeB products are delicate – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or injury to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
MP 16x12x2 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MP 16x12x2 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	11 219 Mx	112.2 µWb
P_c Coefficient	1.22	High (Stable)

Total magnetic flux passing through the magnet pole. Key data in coil applications as well as sensors. P_c value determines the magnet's operating point.

Table 11: Submerged application
MP 16x12x2 / N38

Environment	Effective steel pull	Effect
Air (land)	0.68 kg	Standard
Water (riverbed)	0.78 kg (+0.10 kg Buoyancy gain)	+14.5%

Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

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

1. Wall mount (shear)

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

2. Steel saturation

*Thin metal sheet (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) = 1.22

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 and environmental data

Elemental analysis

iron (Fe)	64% – 68%
neodymium (Nd)	29% – 32%
boron (B)	1.1% – 1.2%
dysprosium (Dy)	0.5% – 2.0%
coating (Ni-Cu-Ni)	< 0.05%

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: 030183-2025

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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 16x12x2 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.

Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and easily scratched 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 12 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 Ø16x2 mm and a weight of 1.32 g. The pulling force of this model is an impressive 0.68 kg, which translates to 6.62 N in newtons. The mounting hole diameter is precisely 12 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. 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.

Pros

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

Their magnetic field is durable, and after around ten years it drops only by ~1% (theoretically),
Neodymium magnets are remarkably resistant to loss of magnetic properties caused by magnetic disturbances,
A magnet with a smooth silver surface has better aesthetics,
The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
Possibility of detailed machining as well as adjusting to atypical requirements,
Versatile presence in high-tech industry – they are commonly used in hard drives, motor assemblies, advanced medical instruments, as well as multitasking production systems.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:

To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Due to limitations in producing nuts and complicated shapes in magnets, we recommend using casing - magnetic mechanism.
Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical after entering the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

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

The declared magnet strength refers to the peak performance, obtained under ideal test conditions, namely:

with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
whose transverse dimension equals approx. 10 mm
characterized by lack of roughness
without any insulating layer between the magnet and steel
during pulling in a direction perpendicular to the mounting surface
at room temperature

Determinants of practical lifting force of a magnet

In practice, the actual holding force depends on many variables, listed from most significant:

Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
Base massiveness – too thin plate causes magnetic saturation, causing part of the flux to be escaped to the other side.
Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets

Medical interference

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Electronic hazard

Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, timepieces).

Eye protection

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. Wear goggles.

Crushing risk

Big blocks can break fingers in a fraction of a second. Under no circumstances put your hand betwixt two attracting surfaces.

No play value

Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Keep away from kids and pets.

Maximum temperature

Do not overheat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Handling rules

Use magnets consciously. Their powerful strength can shock even experienced users. Stay alert and respect their power.

Do not drill into magnets

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness occurs, cease handling magnets and use protective gear.

Impact on smartphones

Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

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

MP 16x12x2 / N38 - ring magnet

Hunting for a discount?

MP 16x12x2 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the magnet - report

1. Wall mount (shear)

2. Steel saturation

3. Thermal stability

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

Elemental analysis

Sustainability

Pulling force

Field Strength

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Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Limitations

Holding force characteristics

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

Determinants of practical lifting force of a magnet

Medical interference

Electronic hazard

Eye protection

Crushing risk

No play value

Maximum temperature

Handling rules

Do not drill into magnets

Sensitization to coating

Impact on smartphones

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.