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MP 32x16x3 / N38 - ring magnet

ring magnet

Catalog no 030198

GTIN/EAN: 5906301812159

5.00

Diameter

32 mm [±0,1 mm]

internal diameter Ø

16 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

13.57 g

Magnetization Direction

↑ axial

Load capacity

2.79 kg / 27.40 N

Magnetic Induction

114.25 mT / 1142 Gs

Coating

[NiCuNi] Nickel

view properties »

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Detailed specification - MP 32x16x3 / N38 - ring magnet

Specification / characteristics - MP 32x16x3 / N38 - ring magnet

properties
properties values
Cat. no. 030198
GTIN/EAN 5906301812159
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 32 mm [±0,1 mm]
internal diameter Ø 16 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 13.57 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.79 kg / 27.40 N
Magnetic Induction ~ ? 114.25 mT / 1142 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 32x16x3 / 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 magnet - report

Presented information are the outcome of a physical simulation. Values were calculated on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static pull force (force vs gap) - interaction chart
MP 32x16x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5552 Gs
555.2 mT
 2.79 kg / 6.15 LBS
2790.0 g / 27.4 N
 warning
1 mm 5202 Gs
520.2 mT
 2.45 kg / 5.40 LBS
2448.8 g / 24.0 N
 warning
2 mm 4850 Gs
485.0 mT
 2.13 kg / 4.69 LBS
2128.7 g / 20.9 N
 warning
3 mm 4504 Gs
450.4 mT
 1.84 kg / 4.05 LBS
1836.3 g / 18.0 N
 safe
5 mm 3849 Gs
384.9 mT
 1.34 kg / 2.96 LBS
1340.5 g / 13.2 N
 safe
10 mm 2513 Gs
251.3 mT
 0.57 kg / 1.26 LBS
571.6 g / 5.6 N
 safe
15 mm 1633 Gs
163.3 mT
 0.24 kg / 0.53 LBS
241.2 g / 2.4 N
 safe
20 mm 1087 Gs
108.7 mT
 0.11 kg / 0.24 LBS
107.0 g / 1.0 N
 safe
30 mm 535 Gs
53.5 mT
 0.03 kg / 0.06 LBS
25.9 g / 0.3 N
 safe
50 mm 181 Gs
18.1 mT
 0.00 kg / 0.01 LBS
3.0 g / 0.0 N
 safe
Grip strength decreases sharply per each millimeter of gap. Note that even a microscopic distance (e.g., dirt, paint, rust) strongly diminishes the holding power. Magnets hold strongest in perfect adhesion; distance drastically cuts the force. Analyze how flashily the load capacity fall, when the magnet does not adhere flatly to the steel surface. When designing the mounting, eliminate unnecessary gaps.

Table 2: Vertical capacity (vertical surface)
MP 32x16x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.56 kg / 1.23 LBS
558.0 g / 5.5 N
1 mm Stal (~0.2) 0.49 kg / 1.08 LBS
490.0 g / 4.8 N
2 mm Stal (~0.2) 0.43 kg / 0.94 LBS
426.0 g / 4.2 N
3 mm Stal (~0.2) 0.37 kg / 0.81 LBS
368.0 g / 3.6 N
5 mm Stal (~0.2) 0.27 kg / 0.59 LBS
268.0 g / 2.6 N
10 mm Stal (~0.2) 0.11 kg / 0.25 LBS
114.0 g / 1.1 N
15 mm Stal (~0.2) 0.05 kg / 0.11 LBS
48.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section indicates the approximate weight limit needed to cause the shifting of the magnet downwards on a vertical steel wall (considering typical friction coefficient). The holding force is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 32x16x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.84 kg / 1.85 LBS
837.0 g / 8.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.56 kg / 1.23 LBS
558.0 g / 5.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.28 kg / 0.62 LBS
279.0 g / 2.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.40 kg / 3.08 LBS
1395.0 g / 13.7 N
When mounting a magnet on a upright wall (e.g., a car body), it you can count on barely approx. 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that magnets move down faster than they pop off the substrate. Planning a vertical fastening? Remember that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the element will give way down under a noticeably lighter load. Application of an anti-slip coating can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 32x16x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.28 kg / 0.62 LBS
279.0 g / 2.7 N
1 mm
25%
 0.70 kg / 1.54 LBS
697.5 g / 6.8 N
2 mm
50%
 1.40 kg / 3.08 LBS
1395.0 g / 13.7 N
3 mm
75%
 2.09 kg / 4.61 LBS
2092.5 g / 20.5 N
5 mm
100%
 2.79 kg / 6.15 LBS
2790.0 g / 27.4 N
10 mm
100%
 2.79 kg / 6.15 LBS
2790.0 g / 27.4 N
11 mm
100%
 2.79 kg / 6.15 LBS
2790.0 g / 27.4 N
12 mm
100%
 2.79 kg / 6.15 LBS
2790.0 g / 27.4 N
A thin sheet is unable to absorb the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a thin surface, the flux will pass right through and the holding will be smaller. To utilize full efficiency of this magnet's power, you require a sufficiently solid piece of metal. The saturation effect means that on sheet metal structures (e.g., thin profiles), the product works worse. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MP 32x16x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.79 kg / 6.15 LBS
2790.0 g / 27.4 N
 OK
40 °C -2.2% 2.73 kg / 6.02 LBS
2728.6 g / 26.8 N
 OK
60 °C -4.4% 2.67 kg / 5.88 LBS
2667.2 g / 26.2 N
 OK
80 °C -6.6% 2.61 kg / 5.74 LBS
2605.9 g / 25.6 N
100 °C -28.8% 1.99 kg / 4.38 LBS
1986.5 g / 19.5 N
Classic neodymiums irreversibly lose parameters past the thermal threshold. Protect against heat – excessive heat can irreversibly demagnetize this product. With increasing heat, the magnet's power momentarily lowers. Avoid using this magnet close to ovens higher than its safe range. Ignoring the limit will lead to irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 32x16x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 128.78 kg / 283.90 LBS
6 014 Gs
19.32 kg / 42.59 LBS
19317 g / 189.5 N
 N/A
1 mm 120.86 kg / 266.44 LBS
10 757 Gs
18.13 kg / 39.97 LBS
18128 g / 177.8 N
 108.77 kg / 239.80 LBS
~0 Gs
2 mm 113.03 kg / 249.19 LBS
10 403 Gs
16.95 kg / 37.38 LBS
16954 g / 166.3 N
 101.73 kg / 224.27 LBS
~0 Gs
3 mm 105.49 kg / 232.56 LBS
10 050 Gs
15.82 kg / 34.88 LBS
15823 g / 155.2 N
 94.94 kg / 209.31 LBS
~0 Gs
5 mm 91.34 kg / 201.37 LBS
9 352 Gs
13.70 kg / 30.21 LBS
13701 g / 134.4 N
 82.21 kg / 181.23 LBS
~0 Gs
10 mm 61.88 kg / 136.41 LBS
7 697 Gs
9.28 kg / 20.46 LBS
9281 g / 91.0 N
 55.69 kg / 122.77 LBS
~0 Gs
20 mm 26.38 kg / 58.16 LBS
5 026 Gs
3.96 kg / 8.72 LBS
3957 g / 38.8 N
 23.74 kg / 52.35 LBS
~0 Gs
50 mm 2.35 kg / 5.17 LBS
1 499 Gs
0.35 kg / 0.78 LBS
352 g / 3.5 N
 2.11 kg / 4.66 LBS
~0 Gs
60 mm 1.19 kg / 2.63 LBS
1 069 Gs
0.18 kg / 0.39 LBS
179 g / 1.8 N
 1.07 kg / 2.37 LBS
~0 Gs
70 mm 0.65 kg / 1.42 LBS
786 Gs
0.10 kg / 0.21 LBS
97 g / 1.0 N
 0.58 kg / 1.28 LBS
~0 Gs
80 mm 0.37 kg / 0.81 LBS
594 Gs
0.06 kg / 0.12 LBS
55 g / 0.5 N
 0.33 kg / 0.73 LBS
~0 Gs
90 mm 0.22 kg / 0.49 LBS
459 Gs
0.03 kg / 0.07 LBS
33 g / 0.3 N
 0.20 kg / 0.44 LBS
~0 Gs
100 mm 0.14 kg / 0.30 LBS
362 Gs
0.02 kg / 0.05 LBS
21 g / 0.2 N
 0.12 kg / 0.27 LBS
~0 Gs
Two magnets interact from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet produces a massive flux and a further horizon of operation. Designing a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is extreme. The levitation is slightly lower than the attraction, but still significant.
*Field value between like poles is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Calculations apply to sliding force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
MP 32x16x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 20.5 cm
Hearing aid 10 Gs (1.0 mT) 16.0 cm
Mechanical watch 20 Gs (2.0 mT) 12.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.5 cm
Remote 50 Gs (5.0 mT) 9.0 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Extremely neodym field is a real danger to electronic devices as well as pacemakers. These neodymiums generate a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and glass. Exceptional care must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MP 32x16x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.21 km/h
(4.50 m/s)
 0.14 J
30 mm 25.19 km/h
(7.00 m/s)
 0.33 J
50 mm 32.36 km/h
(8.99 m/s)
 0.55 J
100 mm 45.73 km/h
(12.70 m/s)
 1.09 J
Neodymium magnets are prone to chipping – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Corrosion resistance
MP 32x16x3 / 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 32x16x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 38 808 Mx 388.1 µWb
Pc Coefficient 0.90 High (Stable)
Flux value passing through the magnet pole. Essential parameter for generator designers as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
MP 32x16x3 / N38

Environment Effective steel pull Effect
Air (land) 2.79 kg Standard
Water (riverbed) 3.19 kg
(+0.40 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Vertical hold

*Warning: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.90

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
Elemental analysis
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: 030198-2026
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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 is a crucial issue when working with model MP 32x16x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable 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. 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. 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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø32 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 2.79 kg, which translates to 27.40 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 16 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.

Advantages and disadvantages of rare earth magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after approximately ten years it decreases only by ~1% (according to research),
  • They possess excellent resistance to weakening of magnetic properties as a result of external fields,
  • Thanks to the smooth finish, the surface of nickel, gold-plated, or silver gives an modern appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • In view of the potential of precise molding and customization to custom solutions, magnetic components can be produced in a broad palette of shapes and sizes, which amplifies use scope,
  • Huge importance in modern technologies – they are used in mass storage devices, electric drive systems, precision medical tools, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - magnetic mount.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can complicate diagnosis medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Maximum magnetic pulling force – what it depends on?

The declared magnet strength concerns the limit force, measured under optimal environment, meaning:
  • on a plate made of mild steel, effectively closing the magnetic field
  • with a cross-section of at least 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • under vertical application of breakaway force (90-degree angle)
  • at temperature room level

What influences lifting capacity in practice

Please note that the application force may be lower influenced by elements below, starting with the most relevant:
  • Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be lost into the air.
  • Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
Threat to electronics

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

Mechanical processing

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

This is not a toy

Only for adults. Tiny parts pose a choking risk, leading to severe trauma. Store out of reach of kids and pets.

Threat to navigation

An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a device to prevent breaking the sensors.

Crushing force

Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, crushing anything in their path. Be careful!

Life threat

For implant holders: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Skin irritation risks

A percentage of the population have a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Prolonged contact may cause dermatitis. We suggest wear protective gloves.

Thermal limits

Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Do not underestimate power

Handle with care. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can react.

Fragile material

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

Warning! Details about risks in the article: Safety of working with magnets.