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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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Product card - 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 modeling of the product - report

Presented information are the outcome of a engineering calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - power drop
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
strong
1 mm 5202 Gs
520.2 mT
2.45 kg / 5.40 lbs
2448.8 g / 24.0 N
strong
2 mm 4850 Gs
485.0 mT
2.13 kg / 4.69 lbs
2128.7 g / 20.9 N
strong
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

Table 2: Slippage hold (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: 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 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 (saturation) - 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: Thermal stability (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 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: Magnet-Magnet interaction (attraction) - field range
MP 32x16x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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: Hazards (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
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: Collisions (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: Construction 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: Submerged application
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

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

2. Steel saturation

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

3. Thermal stability

*For N38 material, the max working temp 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.

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
Measurement Calculator
Force (pull)

Field Strength

Other offers

The ring-shaped magnet MP 32x16x3 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. 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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure 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 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.
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.
This model is characterized by dimensions Ø32x3 mm and a weight of 13.57 g. The key parameter here is the holding force amounting to approximately 2.79 kg (force ~27.40 N). The mounting hole diameter is precisely 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. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Pros and cons of Nd2Fe14B magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose strength, even after approximately 10 years – the decrease in power is only ~1% (theoretically),
  • They are noted for resistance to demagnetization induced by external field influence,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • 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...
  • Considering the option of free shaping and adaptation to custom projects, neodymium magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
  • Versatile presence in electronics industry – they are commonly used in computer drives, electric motors, diagnostic systems, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

Problematic aspects of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their 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 stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Holding force of 2.79 kg is a measurement result performed under standard conditions:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • under conditions of ideal adhesion (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Determinants of lifting force in real conditions

It is worth knowing that the working load may be lower influenced by the following factors, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
Metal Allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, cease working with magnets and use protective gear.

Risk of cracking

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Magnetic media

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Bone fractures

Watch your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!

Respect the power

Exercise caution. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can react.

Dust explosion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Danger to pacemakers

Life threat: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Threat to navigation

An intense magnetic field negatively affects the operation of magnetometers in smartphones and GPS navigation. Maintain magnets near a smartphone to prevent breaking the sensors.

Demagnetization risk

Do not overheat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Do not give to children

Product intended for adults. Small elements can be swallowed, causing serious injuries. Store out of reach of kids and pets.

Danger! Need more info? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98