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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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Technical of the product - 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

Physical modeling of the product - data

Presented data constitute the direct effect of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - power drop
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 lbs
680.0 g / 6.7 N
 low risk
1 mm 5259 Gs
525.9 mT
 0.52 kg / 1.15 lbs
520.7 g / 5.1 N
 low risk
2 mm 4534 Gs
453.4 mT
 0.39 kg / 0.85 lbs
387.0 g / 3.8 N
 low risk
3 mm 3870 Gs
387.0 mT
 0.28 kg / 0.62 lbs
281.9 g / 2.8 N
 low risk
5 mm 2776 Gs
277.6 mT
 0.15 kg / 0.32 lbs
145.1 g / 1.4 N
 low risk
10 mm 1251 Gs
125.1 mT
 0.03 kg / 0.06 lbs
29.4 g / 0.3 N
 low risk
15 mm 643 Gs
64.3 mT
 0.01 kg / 0.02 lbs
7.8 g / 0.1 N
 low risk
20 mm 372 Gs
37.2 mT
 0.00 kg / 0.01 lbs
2.6 g / 0.0 N
 low risk
30 mm 159 Gs
15.9 mT
 0.00 kg / 0.00 lbs
0.5 g / 0.0 N
 low risk
50 mm 49 Gs
4.9 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
Grip strength decreases drastically with every mm of gap. Keep in mind that every additional insulation layer (e.g., contamination, varnish, rust) strongly reduces the pull force. Magnets hold strongest during direct contact; air break kills the power. Observe how flashily the load capacity drop, when the product does not touch tightly to the steel surface. When calculating the mounting, discard additional spacers.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.14 kg / 0.30 lbs
136.0 g / 1.3 N
1 mm Stal (~0.2) 0.10 kg / 0.23 lbs
104.0 g / 1.0 N
2 mm Stal (~0.2) 0.08 kg / 0.17 lbs
78.0 g / 0.8 N
3 mm Stal (~0.2) 0.06 kg / 0.12 lbs
56.0 g / 0.5 N
5 mm Stal (~0.2) 0.03 kg / 0.07 lbs
30.0 g / 0.3 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
2.0 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 indicates the approximate shear load needed to start the sliding of the magnet vertically on a vertical steel wall (considering typical friction coefficient). The holding force varies with the distance 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 lbs
204.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.14 kg / 0.30 lbs
136.0 g / 1.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 lbs
68.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.34 kg / 0.75 lbs
340.0 g / 3.3 N
When hanging a magnet on a vertical plane (e.g., a board), it will maintain barely about 1/5 of its maximum pull force. Gravity as well as a weak degree of grip mean that magnets slide down faster than they detach. Want to create a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a noticeably lighter weight. Application of an anti-slip layer can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - 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 lbs
68.0 g / 0.7 N
1 mm
25%
 0.17 kg / 0.37 lbs
170.0 g / 1.7 N
2 mm
50%
 0.34 kg / 0.75 lbs
340.0 g / 3.3 N
3 mm
75%
 0.51 kg / 1.12 lbs
510.0 g / 5.0 N
5 mm
100%
 0.68 kg / 1.50 lbs
680.0 g / 6.7 N
10 mm
100%
 0.68 kg / 1.50 lbs
680.0 g / 6.7 N
11 mm
100%
 0.68 kg / 1.50 lbs
680.0 g / 6.7 N
12 mm
100%
 0.68 kg / 1.50 lbs
680.0 g / 6.7 N
A thin metal plate cannot take in the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, 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 element of metal. The material oversaturation causes that on delicate walls (e.g., car bodies), the product shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - resistance threshold
MP 16x12x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.68 kg / 1.50 lbs
680.0 g / 6.7 N
 OK
40 °C -2.2% 0.67 kg / 1.47 lbs
665.0 g / 6.5 N
 OK
60 °C -4.4% 0.65 kg / 1.43 lbs
650.1 g / 6.4 N
 OK
80 °C -6.6% 0.64 kg / 1.40 lbs
635.1 g / 6.2 N
100 °C -28.8% 0.48 kg / 1.07 lbs
484.2 g / 4.7 N
Standard neodymium magnets irreversibly lose parameters after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's capacity briefly decreases. Do not use this magnet in hot environments exceeding its operating temperature limit. Too high temperature will lead to destruction of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently at lower temperatures than long magnets. Red status in the table indicates a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 37.47 kg / 82.60 lbs
6 145 Gs
5.62 kg / 12.39 lbs
5620 g / 55.1 N
 N/A
1 mm 32.95 kg / 72.65 lbs
11 273 Gs
4.94 kg / 10.90 lbs
4943 g / 48.5 N
 29.66 kg / 65.38 lbs
~0 Gs
2 mm 28.69 kg / 63.25 lbs
10 519 Gs
4.30 kg / 9.49 lbs
4303 g / 42.2 N
 25.82 kg / 56.92 lbs
~0 Gs
3 mm 24.81 kg / 54.69 lbs
9 781 Gs
3.72 kg / 8.20 lbs
3721 g / 36.5 N
 22.33 kg / 49.22 lbs
~0 Gs
5 mm 18.24 kg / 40.20 lbs
8 386 Gs
2.74 kg / 6.03 lbs
2735 g / 26.8 N
 16.41 kg / 36.18 lbs
~0 Gs
10 mm 7.99 kg / 17.62 lbs
5 552 Gs
1.20 kg / 2.64 lbs
1199 g / 11.8 N
 7.19 kg / 15.86 lbs
~0 Gs
20 mm 1.62 kg / 3.58 lbs
2 501 Gs
0.24 kg / 0.54 lbs
243 g / 2.4 N
 1.46 kg / 3.22 lbs
~0 Gs
50 mm 0.06 kg / 0.13 lbs
471 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
60 mm 0.03 kg / 0.06 lbs
318 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
70 mm 0.01 kg / 0.03 lbs
225 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
80 mm 0.01 kg / 0.02 lbs
166 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.01 lbs
126 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
98 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 steel setup. The connection of two magnets produces a massive flux and a larger range of action. Designing a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is massive. The repulsion force is a bit weaker than the attraction, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
* Calculations show sliding force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (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
Phone / Smartphone 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
Powerful magnet radiation poses a large risk to electronics as well as medical implants. These NdFeB products generate a flux that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation passes through tissues and housings. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - 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
Neodymium magnets are very brittle – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
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 passing through the pole surface. Essential parameter for generator designers as well as sensors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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. Vertical hold

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

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 material, the safety 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 and environmental data
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: 030183-2026
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The ring magnet with a hole MP 16x12x2 / N38 is created for mechanical fastening, 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 16x12x2 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. It's a good idea to use a flexible washer 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 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 indoor use. For outdoor applications, we recommend choosing magnets in hermetic housing 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. Aesthetic mounting requires selecting the appropriate head size.
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.
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. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of rare earth magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
  • Magnets very well resist against loss of magnetization caused by foreign field sources,
  • By applying a shiny coating of nickel, the element gains an modern look,
  • Magnets possess maximum magnetic induction on the working surface,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Due to the ability of flexible shaping and adaptation to custom projects, magnetic components can be manufactured in a wide range of shapes and sizes, which amplifies use scope,
  • Huge importance in modern technologies – they find application in data components, electric drive systems, medical equipment, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in small systems

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience 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
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mount.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

Magnet power is the result of a measurement for the most favorable conditions, including:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • with a plane free of scratches
  • under conditions of ideal adhesion (metal-to-metal)
  • under vertical force direction (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

During everyday use, the real power depends on a number of factors, ranked from most significant:
  • Clearance – existence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Material composition – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the holding force.

Warnings
Keep away from children

These products are not toys. Eating a few magnets may result in them connecting inside the digestive tract, which poses a critical condition and necessitates immediate surgery.

GPS Danger

A strong magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Do not bring magnets close to a smartphone to prevent breaking the sensors.

Safe distance

Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Protective goggles

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

Medical interference

Patients with a ICD have to maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Powerful field

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

Power loss in heat

Keep cool. NdFeB magnets are susceptible to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Allergic reactions

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.

Do not drill into magnets

Dust generated during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Crushing force

Big blocks can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Caution! Learn more about hazards in the article: Safety of working with magnets.