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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 data 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

Technical modeling of the assembly - technical parameters

Presented values represent the result of a engineering calculation. Values rely on algorithms for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force 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 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
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 force (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) - resistance threshold
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 range
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: Safety (HSE) (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
Timepiece 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) - 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: Anti-corrosion coating durability
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 (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: 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. Vertical hold

*Note: On a vertical wall, the magnet holds just ~20% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Power loss vs temp

*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%
Environmental data
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
Pulling force

Magnetic Field

Other 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. 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. 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. Damage to the protective layer during assembly is the most common cause of rusting. This product is dedicated for indoor 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. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø32x3 mm and a weight of 13.57 g. The pulling force of this model is an impressive 2.79 kg, which translates to 27.40 N in newtons. 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. 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • In view of the possibility of precise forming and customization to custom needs, NdFeB magnets can be modeled in a wide range of forms and dimensions, which expands the range of possible applications,
  • Fundamental importance in high-tech industry – they find application in HDD drives, electric motors, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited ability of making nuts in the magnet and complicated shapes - recommended is cover - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Maximum lifting capacity of the magnetwhat affects it?

Breakaway force was determined for ideal contact conditions, taking into account:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • with a cross-section of at least 10 mm
  • characterized by even structure
  • with total lack of distance (no paint)
  • during pulling in a direction vertical to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

It is worth knowing that the working load may be lower subject to the following factors, starting with the most relevant:
  • Air gap (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Direction of force – highest force is obtained 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).
  • Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be lost to the other side.
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
  • Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

Warnings
GPS and phone interference

Navigation devices and mobile phones are highly susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Shattering risk

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Product not for children

Strictly store magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are life-threatening.

Maximum temperature

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Machining danger

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Nickel allergy

It is widely known that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or choose versions in plastic housing.

Pacemakers

Individuals with a heart stimulator must maintain an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.

Protect data

Do not bring magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and erase data from cards.

Crushing force

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing anything in their path. Be careful!

Powerful field

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

Warning! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98