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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

see parameters »

1.304 ZŁ with VAT / pcs + price for transport

1.060 ZŁ net + 23% VAT / pcs

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Product card - 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 are the outcome of a mathematical analysis. Values rely on models for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - 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
Magnetic force weakens drastically with every mm of spacing. Note that even a very thin break (e.g., contamination, paint, veneer) noticeably weakens the grip. Magnets work strongest at the point of direct contact; air break kills the force. Observe how rapidly the parameters plummet, when the magnet does not touch directly to the metal substrate. When designing the mounting, avoid additional spacers.

Table 2: Shear capacity (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 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
The following data calculates the estimated weight limit needed to cause the shifting of the magnet vertically against a upright steel plate (assuming typical friction coefficient). The holding force is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (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 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 placing a holder on a vertical plane (e.g., a board), it you can count on only approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip cause that products move down faster than they pull off. Want to create a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter cargo. Using a rubber pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - 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
A thin sheet is incapable of absorb the full magnetic flux, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's potential, you require a sufficiently solid backing of metal. The saturation effect causes that on thin elements (e.g., thin profiles), the magnet works worse. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (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 change their properties strength above the temperature limit. Watch out for overheating – high temperature can irreversibly demagnetize this magnet. With increasing heat, the neodymium's capacity briefly drops. Do not use this product close to ovens higher than its safe range. Exceeding the critical threshold will cause destruction of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 wider radius than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of operation. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density between like poles reaches ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Estimates demonstrate friction force of a pair of matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
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
Powerful magnet radiation poses a serious hazard to electronics as well as medical implants. These NdFeB products produce a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field penetrates the body and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - 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
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to skin. Be sure to control the product during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when working with powerful specimens.

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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

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 in coil applications as well as sensors. The Pc coefficient 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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Steel thickness impact

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

3. Temperature resistance

*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
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%
Ecology and recycling (GPSR)
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
Force (pull)
Field Strength
Just fill in one field, and the tool compute the rest instantly.

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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 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. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. 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. Damage to the protective layer during assembly is the most common cause of rusting. If you must use it outside, paint it with anti-corrosion paint after mounting.
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.
This model is characterized by dimensions Ø16x2 mm and a weight of 1.32 g. The key parameter here is the holding force amounting to approximately 0.68 kg (force ~6.62 N). 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. 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of neodymium magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose power, even over nearly 10 years – the reduction in strength is only ~1% (according to tests),
  • Neodymium magnets are distinguished by highly resistant to demagnetization caused by external field sources,
  • In other words, due to the shiny finish of silver, the element gains a professional look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Thanks to modularity in designing and the capacity to customize to unusual requirements,
  • Versatile presence in modern technologies – they find application in hard drives, brushless drives, advanced medical instruments, as well as modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complicated shapes in magnets, we propose using casing - magnetic mount.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price is relatively high,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The specified lifting capacity concerns the maximum value, recorded under optimal environment, specifically:
  • with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a cross-section minimum 10 mm
  • characterized by even structure
  • without any clearance between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity results from many variables, ranked from most significant:
  • Clearance – existence of foreign body (paint, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Plate material – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate reduces the lifting capacity.

Warnings
Allergy Warning

It is widely known that nickel (the usual finish) is a common allergen. If you have an allergy, prevent touching magnets with bare hands or opt for coated magnets.

Protect data

Device Safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Warning for heart patients

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Fire warning

Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Permanent damage

Avoid heat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Eye protection

Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Bone fractures

Large magnets can crush fingers instantly. Do not put your hand between two attracting surfaces.

Conscious usage

Be careful. Neodymium magnets act from a long distance and snap with massive power, often faster than you can react.

Threat to navigation

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Adults only

Only for adults. Small elements can be swallowed, causing severe trauma. Store out of reach of kids and pets.

Safety First! More info about risks in the article: Safety of working with magnets.