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MP 16x12x2 / N38 - ring magnet

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

technical parameters »

1.304 ZŁ with VAT / pcs + price for transport

1.060 ZŁ net + 23% VAT / pcs

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Detailed specification - 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

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

Technical analysis of the assembly - data

These information are the direct effect of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - interaction chart
MP 16x12x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6011 Gs
601.1 mT
 0.68 kg / 1.50 pounds
680.0 g / 6.7 N
 weak grip
1 mm 5259 Gs
525.9 mT
 0.52 kg / 1.15 pounds
520.7 g / 5.1 N
 weak grip
2 mm 4534 Gs
453.4 mT
 0.39 kg / 0.85 pounds
387.0 g / 3.8 N
 weak grip
3 mm 3870 Gs
387.0 mT
 0.28 kg / 0.62 pounds
281.9 g / 2.8 N
 weak grip
5 mm 2776 Gs
277.6 mT
 0.15 kg / 0.32 pounds
145.1 g / 1.4 N
 weak grip
10 mm 1251 Gs
125.1 mT
 0.03 kg / 0.06 pounds
29.4 g / 0.3 N
 weak grip
15 mm 643 Gs
64.3 mT
 0.01 kg / 0.02 pounds
7.8 g / 0.1 N
 weak grip
20 mm 372 Gs
37.2 mT
 0.00 kg / 0.01 pounds
2.6 g / 0.0 N
 weak grip
30 mm 159 Gs
15.9 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 weak grip
50 mm 49 Gs
4.9 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Pulling power drops sharply with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., dirt, paint, dust) strongly diminishes the holding power. Magnets work strongest during direct contact; distance drastically cuts the force. See how flashily the parameters plummet, when the product does not touch tightly to the metal substrate. When planning the mounting, avoid additional spacers.

Table 2: Sliding load (vertical surface)
MP 16x12x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.14 kg / 0.30 pounds
136.0 g / 1.3 N
1 mm Stal (~0.2) 0.10 kg / 0.23 pounds
104.0 g / 1.0 N
2 mm Stal (~0.2) 0.08 kg / 0.17 pounds
78.0 g / 0.8 N
3 mm Stal (~0.2) 0.06 kg / 0.12 pounds
56.0 g / 0.5 N
5 mm Stal (~0.2) 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
10 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below calculates the approximate force necessary to initiate the sliding of the magnet vertically on a vertical steel wall (considering standard friction). This value varies with 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/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.20 kg / 0.45 pounds
204.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.14 kg / 0.30 pounds
136.0 g / 1.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 pounds
68.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.34 kg / 0.75 pounds
340.0 g / 3.3 N
When hanging a element on a upright surface (e.g., a car body), it will maintain barely approx. 1/5 of its nominal power. Gravitational force as well as a low friction coefficient influence the fact that magnets slide down faster than they pull off. Want to create a vertical fastening? Note that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the element will slide down under a much lighter cargo. Using a rubber layer can effectively raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MP 16x12x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.07 kg / 0.15 pounds
68.0 g / 0.7 N
1 mm
25%
 0.17 kg / 0.37 pounds
170.0 g / 1.7 N
2 mm
50%
 0.34 kg / 0.75 pounds
340.0 g / 3.3 N
3 mm
75%
 0.51 kg / 1.12 pounds
510.0 g / 5.0 N
5 mm
100%
 0.68 kg / 1.50 pounds
680.0 g / 6.7 N
10 mm
100%
 0.68 kg / 1.50 pounds
680.0 g / 6.7 N
11 mm
100%
 0.68 kg / 1.50 pounds
680.0 g / 6.7 N
12 mm
100%
 0.68 kg / 1.50 pounds
680.0 g / 6.7 N
A too thin steel is incapable of conduct the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the flux will penetrate right through and the holding will be smaller. To squeeze full efficiency of this neodymium's potential, you need a suitably thick backing of metal. The saturation phenomenon means that on delicate walls (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MP 16x12x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.68 kg / 1.50 pounds
680.0 g / 6.7 N
 OK
40 °C -2.2% 0.67 kg / 1.47 pounds
665.0 g / 6.5 N
 OK
60 °C -4.4% 0.65 kg / 1.43 pounds
650.1 g / 6.4 N
 OK
80 °C -6.6% 0.64 kg / 1.40 pounds
635.1 g / 6.2 N
100 °C -28.8% 0.48 kg / 1.07 pounds
484.2 g / 4.7 N
Standard neodymium magnets irreversibly lose power past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly demagnetize this product. With increasing heat, the magnet's force momentarily drops. Do not use this product in hot environments exceeding its operating temperature limit. Too high temperature will cause permanent loss of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low Pc) risk losing magnetic properties sooner compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MP 16x12x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 37.47 kg / 82.60 pounds
6 145 Gs
5.62 kg / 12.39 pounds
5620 g / 55.1 N
 N/A
1 mm 32.95 kg / 72.65 pounds
11 273 Gs
4.94 kg / 10.90 pounds
4943 g / 48.5 N
 29.66 kg / 65.38 pounds
~0 Gs
2 mm 28.69 kg / 63.25 pounds
10 519 Gs
4.30 kg / 9.49 pounds
4303 g / 42.2 N
 25.82 kg / 56.92 pounds
~0 Gs
3 mm 24.81 kg / 54.69 pounds
9 781 Gs
3.72 kg / 8.20 pounds
3721 g / 36.5 N
 22.33 kg / 49.22 pounds
~0 Gs
5 mm 18.24 kg / 40.20 pounds
8 386 Gs
2.74 kg / 6.03 pounds
2735 g / 26.8 N
 16.41 kg / 36.18 pounds
~0 Gs
10 mm 7.99 kg / 17.62 pounds
5 552 Gs
1.20 kg / 2.64 pounds
1199 g / 11.8 N
 7.19 kg / 15.86 pounds
~0 Gs
20 mm 1.62 kg / 3.58 pounds
2 501 Gs
0.24 kg / 0.54 pounds
243 g / 2.4 N
 1.46 kg / 3.22 pounds
~0 Gs
50 mm 0.06 kg / 0.13 pounds
471 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
60 mm 0.03 kg / 0.06 pounds
318 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
70 mm 0.01 kg / 0.03 pounds
225 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
80 mm 0.01 kg / 0.02 pounds
166 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
126 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
98 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a further horizon of performance. Want to build a strong closure? Apply two magnets instead of a neodymium and a steel. Remember that when attracting two neodymiums, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
* Estimates demonstrate sliding force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - 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
Car key 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 electronic devices as well as medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Remember: the invisible magnetic field passes through tissues and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MP 16x12x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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
Magnetic elements are very brittle – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Surface protection spec
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: Electrical data (Pc)
MP 16x12x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 219 Mx 112.2 µWb
Pc Coefficient 1.22 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter for generator designers as well as sensors. The Pc coefficient determines the working geometry.

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.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Caution: On a vertical surface, the magnet retains merely a fraction of its nominal pull.

2. Steel saturation

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.22

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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 Pc (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 Pc 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
Chemical composition
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: 030183-2026
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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 easy screwing to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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. Always check that the screw head is not larger than the outer diameter of the magnet (16 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø16 mm (outer diameter) and height 2 mm. The pulling force of this model is an impressive 0.68 kg, which translates to 6.62 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 12 mm.
The poles are located on the planes with holes, not on the sides of the ring. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths and weaknesses of rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even after approximately 10 years – the reduction in strength is only ~1% (based on measurements),
  • Neodymium magnets are characterized by remarkably resistant to loss of magnetic properties caused by external magnetic fields,
  • Thanks to the smooth finish, the coating of nickel, gold, or silver-plated gives an visually attractive appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to the ability of flexible molding and customization to specialized solutions, neodymium magnets can be created in a broad palette of forms and dimensions, which makes them more universal,
  • Significant place in future technologies – they find application in data components, drive modules, medical devices, and other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Cons of neodymium magnets and proposals for their use:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. 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
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We suggest cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

The load parameter shown refers to the limit force, measured under ideal test conditions, meaning:
  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • with a cross-section of at least 10 mm
  • with an ideally smooth contact surface
  • with direct contact (no paint)
  • under axial force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

Please note that the application force may be lower depending on the following factors, in order of importance:
  • Air gap (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel attracts best. Alloy steels decrease magnetic properties and holding force.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Swallowing risk

Always keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are life-threatening.

Flammability

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Threat to electronics

Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Shattering risk

Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. Eye protection is mandatory.

Precision electronics

Note: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, tablet, and GPS.

Physical harm

Pinching hazard: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Health Danger

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Permanent damage

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. Damage is permanent.

Sensitization to coating

Studies show that nickel (the usual finish) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or select versions in plastic housing.

Caution required

Exercise caution. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can react.

Caution! Details about risks in the article: Safety of working with magnets.