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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 details - 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

Technical modeling of the product - technical parameters

Presented information are the outcome of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Actual performance may differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs distance) - 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 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
weak grip
5 mm 3849 Gs
384.9 mT
1.34 kg / 2.96 LBS
1340.5 g / 13.2 N
weak grip
10 mm 2513 Gs
251.3 mT
0.57 kg / 1.26 LBS
571.6 g / 5.6 N
weak grip
15 mm 1633 Gs
163.3 mT
0.24 kg / 0.53 LBS
241.2 g / 2.4 N
weak grip
20 mm 1087 Gs
108.7 mT
0.11 kg / 0.24 LBS
107.0 g / 1.0 N
weak grip
30 mm 535 Gs
53.5 mT
0.03 kg / 0.06 LBS
25.9 g / 0.3 N
weak grip
50 mm 181 Gs
18.1 mT
0.00 kg / 0.01 LBS
3.0 g / 0.0 N
weak grip

Table 2: Sliding load (wall)
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

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

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

Table 5: Working in heat (material behavior) - power drop
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

Table 6: Two magnets (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

Table 7: Protective zones (electronics) - precautionary measures
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
Mobile device 40 Gs (4.0 mT) 9.5 cm
Car key 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: Impact energy (cracking risk) - collision effects
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 (Flux)
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%
Corrosion warning: 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

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

2. Steel saturation

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

3. Thermal stability

*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

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
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
Magnet Unit Converter
Magnet pull force

Field Strength

Check out more products

The ring magnet with a hole MP 32x16x3 / N38 is created for permanent mounting, 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 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. 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.
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 easily scratched 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 16 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. Aesthetic mounting requires selecting the appropriate head size.
It is a magnetic ring with a diameter of 32 mm and thickness 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.
The poles are located on the planes with holes, not on the sides of the ring. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros as well as cons of rare earth magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even during around 10 years – the decrease in lifting capacity is only ~1% (theoretically),
  • They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
  • Magnetic induction on the surface of the magnet remains maximum,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of custom machining and modifying to complex needs,
  • Huge importance in electronics industry – they are used in mass storage devices, brushless drives, advanced medical instruments, also modern systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Pull force analysis

Maximum magnetic pulling forcewhat contributes to it?

The force parameter is a result of laboratory testing conducted under standard conditions:
  • using a base made of mild steel, functioning as a circuit closing element
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

In practice, the real power depends on a number of factors, listed from the most important:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the load capacity.

H&S for magnets
Serious injuries

Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Powerful field

Handle with care. Rare earth magnets attract from a distance and connect with massive power, often quicker than you can react.

Warning for allergy sufferers

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands and select coated magnets.

Health Danger

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Magnetic media

Do not bring magnets close to a purse, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.

Heat sensitivity

Avoid heat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).

Fire risk

Powder generated during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Keep away from children

Absolutely keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are tragic.

GPS and phone interference

An intense magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.

Material brittleness

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Safety First! Details about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98