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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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Parameters as well as appearance of neodymium magnets can be estimated using our force calculator.

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Technical of the product - 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 product - technical parameters

These values constitute the outcome of a engineering simulation. Values were calculated on models for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

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
medium risk
1 mm 5202 Gs
520.2 mT
2.45 kg / 5.40 lbs
2448.8 g / 24.0 N
medium risk
2 mm 4850 Gs
485.0 mT
2.13 kg / 4.69 lbs
2128.7 g / 20.9 N
medium risk
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: Shear 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 (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) - 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 (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: 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 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 (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 (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%
Warning: 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)

*Note: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

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

3. Power loss vs temp

*For N38 grade, 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

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
Chemical composition
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
Magnet Unit Converter
Magnet pull force

Magnetic Field

Other offers

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. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. Damage to the protective layer during assembly is the most common cause of rusting. 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.
The presented product is a ring magnet with dimensions Ø32 mm (outer diameter) and height 3 mm. 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.
The poles are located on the planes with holes, not on the sides of the ring. 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.

Strengths and weaknesses of neodymium magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose power, even over nearly ten years – the decrease in strength is only ~1% (theoretically),
  • Magnets perfectly defend themselves against demagnetization caused by external fields,
  • In other words, due to the smooth surface of nickel, the element is aesthetically pleasing,
  • Magnets have huge magnetic induction on the active area,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Due to the option of accurate shaping and adaptation to individualized requirements, NdFeB magnets can be modeled in a broad palette of shapes and sizes, which increases their versatility,
  • Significant place in advanced technology sectors – they are utilized in computer drives, electric motors, medical devices, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The specified lifting capacity refers to the limit force, obtained under optimal environment, meaning:
  • with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • at temperature room level

Lifting capacity in practice – influencing factors

Real force impacted by working environment parameters, mainly (from priority):
  • Clearance – existence of foreign body (rust, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.

Warnings
Danger to the youngest

NdFeB magnets are not intended for children. Swallowing a few magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.

Immense force

Be careful. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can react.

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop working with magnets and wear gloves.

Impact on smartphones

A strong magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to avoid damaging the sensors.

Electronic devices

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

Crushing risk

Watch your fingers. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Fire risk

Dust created during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Magnets are brittle

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets will cause them breaking into small pieces.

Permanent damage

Control the heat. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.

Warning for heart patients

People with a heart stimulator must maintain an large gap from magnets. The magnetism can interfere with the operation of the life-saving device.

Important! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98