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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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Technical data - 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 analysis of the assembly - report

These data represent the direct effect of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull 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 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

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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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

Table 4: Steel thickness (saturation) - power losses
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

Table 5: Thermal stability (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 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

Table 6: Two magnets (repulsion) - field collision
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 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

Table 7: Protective zones (electronics) - 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: Impact energy (cracking risk) - collision effects
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: 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)

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)

Table 11: Hydrostatics and buoyancy
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

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

2. Steel thickness impact

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

3. Temperature resistance

*For N38 material, 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

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.

Engineering data and GPSR
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%
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: 030183-2026
Quick Unit Converter
Magnet pull force

Field Strength

See also deals

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 can be damaged 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. 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.
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.
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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to versatility in designing and the capacity to adapt to individual projects,
  • Fundamental importance in modern technologies – they serve a role in computer drives, motor assemblies, medical equipment, also complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their 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.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat it depends on?

Breakaway force was determined for the most favorable conditions, assuming:
  • using a base made of low-carbon steel, functioning as a circuit closing element
  • with a thickness minimum 10 mm
  • with an polished touching surface
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity results from several key aspects, listed from crucial:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy steels decrease magnetic properties and holding force.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

Precautions when working with neodymium magnets
Do not drill into magnets

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Skin irritation risks

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.

Danger to the youngest

These products are not suitable for play. Accidental ingestion of multiple magnets can lead to them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.

Keep away from electronics

Navigation devices and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Shattering risk

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Data carriers

Avoid bringing magnets near a wallet, computer, or screen. The magnetism can destroy these devices and wipe information from cards.

Medical implants

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

Handling rules

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

Crushing risk

Risk of injury: The pulling power is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Permanent damage

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. This process is irreversible.

Important! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98