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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

1.304 with VAT / pcs + price for transport

1.060 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Engineering simulation of the product - data

The following information constitute the outcome of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - characteristics
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
safe
1 mm 5259 Gs
525.9 mT
0.52 kg / 1.15 pounds
520.7 g / 5.1 N
safe
2 mm 4534 Gs
453.4 mT
0.39 kg / 0.85 pounds
387.0 g / 3.8 N
safe
3 mm 3870 Gs
387.0 mT
0.28 kg / 0.62 pounds
281.9 g / 2.8 N
safe
5 mm 2776 Gs
277.6 mT
0.15 kg / 0.32 pounds
145.1 g / 1.4 N
safe
10 mm 1251 Gs
125.1 mT
0.03 kg / 0.06 pounds
29.4 g / 0.3 N
safe
15 mm 643 Gs
64.3 mT
0.01 kg / 0.02 pounds
7.8 g / 0.1 N
safe
20 mm 372 Gs
37.2 mT
0.00 kg / 0.01 pounds
2.6 g / 0.0 N
safe
30 mm 159 Gs
15.9 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
safe
50 mm 49 Gs
4.9 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Shear force (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

Table 3: Wall mounting (shearing) - 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

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 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

Table 5: Thermal stability (material behavior) - thermal limit
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

Table 6: Magnet-Magnet interaction (attraction) - 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 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

Table 7: Hazards (implants) - precautionary measures
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

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

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)

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

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

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.
1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just ~20% of its max power.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (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 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
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
Quick Unit Converter
Magnet pull force

Field Strength

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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. 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 very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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.
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. 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 mounting hole diameter is precisely 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even after approximately ten years – the reduction in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by external magnetic fields,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in constructing and the capacity to customize to client solutions,
  • Fundamental importance in modern technologies – they serve a role in mass storage devices, electric motors, medical devices, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in compact constructions

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited possibility of producing nuts in the magnet and complex forms - recommended is casing - magnet mounting.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat affects it?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • using a plate made of high-permeability steel, functioning as a magnetic yoke
  • with a thickness no less than 10 mm
  • with an ground contact surface
  • with total lack of distance (without impurities)
  • for force applied at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Real force is affected by working environment parameters, mainly (from most important):
  • Gap (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Warnings
Choking Hazard

NdFeB magnets are not toys. Swallowing a few magnets can lead to them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.

Life threat

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Do not overheat magnets

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Electronic hazard

Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Fragile material

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Crushing risk

Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Safe operation

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Impact on smartphones

An intense magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands or choose versions in plastic housing.

Danger! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98