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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

Engineering analysis of the magnet - data

The following data represent the result of a physical simulation. Results were calculated on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

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

Table 2: Slippage 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

Table 3: Vertical assembly (shearing) - 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: Material efficiency (saturation) - power losses
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) - forces in the system
MP 32x16x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 (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
Timepiece 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: 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: 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: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Vertical hold

*Note: On a vertical surface, the magnet holds merely a fraction of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Thermal stability

*For N38 material, 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 and environmental data
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: 030198-2026
Quick Unit Converter
Force (pull)

Field Strength

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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 easy screwing to wood, wall, plastic, or metal. 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. When tightening the screw, you must maintain great sensitivity. 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. Damage to the protective layer during assembly is the most common cause of rusting. 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.
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. 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.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
  • They feature excellent resistance to magnetism drop as a result of external fields,
  • A magnet with a metallic silver surface has better aesthetics,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in forming and the capacity to modify to complex applications,
  • Huge importance in modern industrial fields – they are utilized in magnetic memories, electric motors, medical devices, as well as other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest 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, in case of application outdoors
  • Limited possibility of creating threads in the magnet and complex shapes - preferred is a housing - mounting mechanism.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what affects it?

The specified lifting capacity represents the limit force, recorded under ideal test conditions, meaning:
  • using a base made of high-permeability steel, serving as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • with direct contact (without paint)
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity results from a number of factors, listed from crucial:
  • Distance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the holding force.

Precautions when working with neodymium magnets
Safe distance

Avoid bringing magnets close to a purse, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Nickel allergy

Some people have a contact allergy to Ni, which is the common plating for neodymium magnets. Extended handling might lead to a rash. We suggest wear safety gloves.

Phone sensors

A powerful magnetic field disrupts the functioning of compasses in phones and navigation systems. Keep magnets near a device to prevent damaging the sensors.

Operating temperature

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.

Handling guide

Handle with care. Neodymium magnets act from a distance and snap with massive power, often faster than you can react.

Machining danger

Powder produced during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Swallowing risk

These products are not suitable for play. Swallowing multiple magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Material brittleness

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Crushing force

Large magnets can crush fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.

Medical interference

Warning for patients: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Caution! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98