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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

5.24 with VAT / pcs + price for transport

4.26 ZŁ net + 23% VAT / pcs

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Technical - 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

Engineering simulation of the product - report

Presented information are the outcome of a mathematical calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
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 pounds
2790.0 g / 27.4 N
medium risk
1 mm 5202 Gs
520.2 mT
2.45 kg / 5.40 pounds
2448.8 g / 24.0 N
medium risk
2 mm 4850 Gs
485.0 mT
2.13 kg / 4.69 pounds
2128.7 g / 20.9 N
medium risk
3 mm 4504 Gs
450.4 mT
1.84 kg / 4.05 pounds
1836.3 g / 18.0 N
weak grip
5 mm 3849 Gs
384.9 mT
1.34 kg / 2.96 pounds
1340.5 g / 13.2 N
weak grip
10 mm 2513 Gs
251.3 mT
0.57 kg / 1.26 pounds
571.6 g / 5.6 N
weak grip
15 mm 1633 Gs
163.3 mT
0.24 kg / 0.53 pounds
241.2 g / 2.4 N
weak grip
20 mm 1087 Gs
108.7 mT
0.11 kg / 0.24 pounds
107.0 g / 1.0 N
weak grip
30 mm 535 Gs
53.5 mT
0.03 kg / 0.06 pounds
25.9 g / 0.3 N
weak grip
50 mm 181 Gs
18.1 mT
0.00 kg / 0.01 pounds
3.0 g / 0.0 N
weak grip

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 pounds
558.0 g / 5.5 N
1 mm Stal (~0.2) 0.49 kg / 1.08 pounds
490.0 g / 4.8 N
2 mm Stal (~0.2) 0.43 kg / 0.94 pounds
426.0 g / 4.2 N
3 mm Stal (~0.2) 0.37 kg / 0.81 pounds
368.0 g / 3.6 N
5 mm Stal (~0.2) 0.27 kg / 0.59 pounds
268.0 g / 2.6 N
10 mm Stal (~0.2) 0.11 kg / 0.25 pounds
114.0 g / 1.1 N
15 mm Stal (~0.2) 0.05 kg / 0.11 pounds
48.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (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 pounds
837.0 g / 8.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.56 kg / 1.23 pounds
558.0 g / 5.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.28 kg / 0.62 pounds
279.0 g / 2.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.40 kg / 3.08 pounds
1395.0 g / 13.7 N

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 pounds
279.0 g / 2.7 N
1 mm
25%
0.70 kg / 1.54 pounds
697.5 g / 6.8 N
2 mm
50%
1.40 kg / 3.08 pounds
1395.0 g / 13.7 N
3 mm
75%
2.09 kg / 4.61 pounds
2092.5 g / 20.5 N
5 mm
100%
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
10 mm
100%
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
11 mm
100%
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
12 mm
100%
2.79 kg / 6.15 pounds
2790.0 g / 27.4 N

Table 5: Thermal resistance (stability) - 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 pounds
2790.0 g / 27.4 N
OK
40 °C -2.2% 2.73 kg / 6.02 pounds
2728.6 g / 26.8 N
OK
60 °C -4.4% 2.67 kg / 5.88 pounds
2667.2 g / 26.2 N
OK
80 °C -6.6% 2.61 kg / 5.74 pounds
2605.9 g / 25.6 N
100 °C -28.8% 1.99 kg / 4.38 pounds
1986.5 g / 19.5 N

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

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 128.78 kg / 283.90 pounds
6 014 Gs
19.32 kg / 42.59 pounds
19317 g / 189.5 N
N/A
1 mm 120.86 kg / 266.44 pounds
10 757 Gs
18.13 kg / 39.97 pounds
18128 g / 177.8 N
108.77 kg / 239.80 pounds
~0 Gs
2 mm 113.03 kg / 249.19 pounds
10 403 Gs
16.95 kg / 37.38 pounds
16954 g / 166.3 N
101.73 kg / 224.27 pounds
~0 Gs
3 mm 105.49 kg / 232.56 pounds
10 050 Gs
15.82 kg / 34.88 pounds
15823 g / 155.2 N
94.94 kg / 209.31 pounds
~0 Gs
5 mm 91.34 kg / 201.37 pounds
9 352 Gs
13.70 kg / 30.21 pounds
13701 g / 134.4 N
82.21 kg / 181.23 pounds
~0 Gs
10 mm 61.88 kg / 136.41 pounds
7 697 Gs
9.28 kg / 20.46 pounds
9281 g / 91.0 N
55.69 kg / 122.77 pounds
~0 Gs
20 mm 26.38 kg / 58.16 pounds
5 026 Gs
3.96 kg / 8.72 pounds
3957 g / 38.8 N
23.74 kg / 52.35 pounds
~0 Gs
50 mm 2.35 kg / 5.17 pounds
1 499 Gs
0.35 kg / 0.78 pounds
352 g / 3.5 N
2.11 kg / 4.66 pounds
~0 Gs
60 mm 1.19 kg / 2.63 pounds
1 069 Gs
0.18 kg / 0.39 pounds
179 g / 1.8 N
1.07 kg / 2.37 pounds
~0 Gs
70 mm 0.65 kg / 1.42 pounds
786 Gs
0.10 kg / 0.21 pounds
97 g / 1.0 N
0.58 kg / 1.28 pounds
~0 Gs
80 mm 0.37 kg / 0.81 pounds
594 Gs
0.06 kg / 0.12 pounds
55 g / 0.5 N
0.33 kg / 0.73 pounds
~0 Gs
90 mm 0.22 kg / 0.49 pounds
459 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
0.20 kg / 0.44 pounds
~0 Gs
100 mm 0.14 kg / 0.30 pounds
362 Gs
0.02 kg / 0.05 pounds
21 g / 0.2 N
0.12 kg / 0.27 pounds
~0 Gs

Table 7: Protective zones (electronics) - 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

Table 8: Dynamics (kinetic energy) - 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

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)

Table 10: Electrical data (Pc)
MP 32x16x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 38 808 Mx 388.1 µWb
Pc Coefficient 0.90 High (Stable)

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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains just a fraction of its max power.

2. Plate thickness effect

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

3. Temperature resistance

*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) = 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%
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: 030198-2026
Measurement Calculator
Magnet pull force

Field Strength

Other proposals

The ring magnet with a hole MP 32x16x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 2.79 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
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. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
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. Always check that the screw head is not larger than the outer diameter of the magnet (32 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 32 mm and thickness 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.79 kg (force ~27.40 N). 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. 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 and disadvantages of rare earth magnets.

Strengths

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • Their power is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • Neodymium magnets remain remarkably resistant to magnetic field loss caused by external interference,
  • By using a smooth layer of gold, the element has an professional look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the ability of precise forming and adaptation to unique requirements, neodymium magnets can be created in a broad palette of geometric configurations, which increases their versatility,
  • Huge importance in modern industrial fields – they serve a role in mass storage devices, electromotive mechanisms, medical devices, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these devices can be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat it depends on?

The lifting capacity listed is a measurement result executed under the following configuration:
  • on a base made of mild steel, effectively closing the magnetic field
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the working load will differ influenced by elements below, in order of importance:
  • Air gap (betwixt the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate reduces the holding force.

Safety rules for work with neodymium magnets
Nickel allergy

Studies show that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent direct skin contact or select coated magnets.

Thermal limits

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Bodily injuries

Danger of trauma: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Magnet fragility

Watch out for shards. Magnets can explode upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Life threat

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Safe operation

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

No play value

Absolutely keep magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are life-threatening.

GPS and phone interference

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Electronic devices

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Dust explosion hazard

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Caution! Looking for details? Check our post: Why are neodymium magnets dangerous?