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MP 16x12x2 / N38 - ring magnet

ring magnet

Catalog no 030183

GTIN/EAN: 5906301812005

5.00
Load capacity 0.68 kg / 6.62 N Magnetic Induction 150.33 mT / 1503 Gs
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
Coating
[NiCuNi] Nickel
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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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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

Engineering analysis of the assembly - data

The following information represent the result of a physical calculation. Results are based on algorithms for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - 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 LBS
680.0 g / 6.7 N
 weak grip
1 mm 5259 Gs
525.9 mT
 0.52 kg / 1.15 LBS
520.7 g / 5.1 N
 weak grip
2 mm 4534 Gs
453.4 mT
 0.39 kg / 0.85 LBS
387.0 g / 3.8 N
 weak grip
3 mm 3870 Gs
387.0 mT
 0.28 kg / 0.62 LBS
281.9 g / 2.8 N
 weak grip
5 mm 2776 Gs
277.6 mT
 0.15 kg / 0.32 LBS
145.1 g / 1.4 N
 weak grip
10 mm 1251 Gs
125.1 mT
 0.03 kg / 0.06 LBS
29.4 g / 0.3 N
 weak grip
15 mm 643 Gs
64.3 mT
 0.01 kg / 0.02 LBS
7.8 g / 0.1 N
 weak grip
20 mm 372 Gs
37.2 mT
 0.00 kg / 0.01 LBS
2.6 g / 0.0 N
 weak grip
30 mm 159 Gs
15.9 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 weak grip
50 mm 49 Gs
4.9 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Pulling power decreases significantly with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., dirt, paint, dust) significantly reduces the pull force. Magnetic products work optimally at the point of direct contact; distance drastically cuts the power. Notice how quickly the load capacity fall, when the magnet does not touch flatly to the steel surface. When planning the arrangement, avoid redundant distances.

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 shows the approximate force needed to initiate the sliding of the magnet vertically on a upright steel plate (considering typical friction coefficient). This parameter depends on the separation distance between the magnet and the metal.

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
When placing a element on a vertical surface (e.g., a car body), it will maintain just about 20%-30% of its nominal power. Gravitational force and a weak degree of grip mean that magnets slip easier than they pop off the substrate. Designing a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller cargo. Application of an anti-slip coating can drastically raise the stability.

Table 4: Steel thickness (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 cannot focus the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a thin surface, the magnetism will pass right through and the holding will be smaller. To achieve the maximum of this neodymium's potential, you require a sufficiently solid element of steel. The material oversaturation means that on delicate walls (e.g., car bodies), the product holds weaker. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal resistance (stability) - 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
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Protect against heat – excessive heat can permanently damage this product. As the temperature rises, the neodymium's force briefly lowers. Avoid using this magnet close to ovens higher than its operating temperature limit. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low Pc) risk losing magnetic properties sooner than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
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 magnet and steel combination. Such a system of magnet-to-magnet generates a stronger field and a larger range of action. Planning to create a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the collision energy is extreme. The levitation is marginally weaker than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Figures apply to friction force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (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
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 is a real danger to electronics and pacemakers. These neodymiums generate a field that disrupts operation of sensitive medical devices. Remember: the unseen radiation passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MP 16x12x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.36 km/h
(5.66 m/s)
 0.02 J
30 mm 20.90 km/h
(5.80 m/s)
 0.02 J
50 mm 20.91 km/h
(5.81 m/s)
 0.02 J
100 mm 20.91 km/h
(5.81 m/s)
 0.02 J
NdFeB products are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can cause material chips or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling 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 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)
Flux value passing through the pole surface. Key data for generator designers and motors. Pc value 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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Thermal stability

*For standard magnets, 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

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 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%

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
Measurement Calculator

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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. Mounting is clean and reversible, unlike gluing. This product with a force of 0.68 kg works great as a door latch, speaker holder, or spacer element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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 inside building 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.
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 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. 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.

Pros and cons of rare earth magnets.

Pros

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • Their strength remains stable, and after around ten years it drops only by ~1% (according to research),
  • They possess excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
  • By using a shiny coating of gold, the element gains an nice look,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of exact modeling as well as optimizing to precise applications,
  • Wide application in future technologies – they serve a role in HDD drives, brushless drives, medical devices, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • 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
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Limited ability of creating nuts in the magnet and complex shapes - preferred is casing - magnet mounting.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

The load parameter shown concerns the limit force, measured under ideal test conditions, namely:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • whose thickness is min. 10 mm
  • with an ideally smooth touching surface
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

What influences lifting capacity in practice

Real force is affected by specific conditions, such as (from priority):
  • Gap (between the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Plate thickness – too thin steel does not close the flux, causing part of the power to be lost into the air.
  • Steel type – mild steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.

Safe handling of neodymium magnets
Demagnetization risk

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

Pinching danger

Risk of injury: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Warning for heart patients

For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.

Do not drill into magnets

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Skin irritation risks

It is widely known that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and select coated magnets.

Material brittleness

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets will cause them breaking into small pieces.

Threat to navigation

Remember: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, tablet, and GPS.

Do not underestimate power

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Threat to electronics

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

Choking Hazard

Only for adults. Small elements can be swallowed, leading to serious injuries. Keep away from kids and pets.

Security! More info about hazards in the article: Magnet Safety Guide.