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MP 32x16x3 / N38 - ring magnet

ring magnet

Catalog no 030198

GTIN/EAN: 5906301812159

5.00
Load capacity 2.79 kg / 27.40 N Magnetic Induction 114.25 mT / 1142 Gs
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
Coating
[NiCuNi] Nickel
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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Detailed specification - 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 simulation of the assembly - report

Presented information constitute the direct effect of a engineering calculation. Values are based on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Treat these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
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 pounds
2790.0 g / 27.4 N
 warning
1 mm 5202 Gs
520.2 mT
 2.45 kg / 5.40 pounds
2448.8 g / 24.0 N
 warning
2 mm 4850 Gs
485.0 mT
 2.13 kg / 4.69 pounds
2128.7 g / 20.9 N
 warning
3 mm 4504 Gs
450.4 mT
 1.84 kg / 4.05 pounds
1836.3 g / 18.0 N
 low risk
5 mm 3849 Gs
384.9 mT
 1.34 kg / 2.96 pounds
1340.5 g / 13.2 N
 low risk
10 mm 2513 Gs
251.3 mT
 0.57 kg / 1.26 pounds
571.6 g / 5.6 N
 low risk
15 mm 1633 Gs
163.3 mT
 0.24 kg / 0.53 pounds
241.2 g / 2.4 N
 low risk
20 mm 1087 Gs
108.7 mT
 0.11 kg / 0.24 pounds
107.0 g / 1.0 N
 low risk
30 mm 535 Gs
53.5 mT
 0.03 kg / 0.06 pounds
25.9 g / 0.3 N
 low risk
50 mm 181 Gs
18.1 mT
 0.00 kg / 0.01 pounds
3.0 g / 0.0 N
 low risk
Magnetic force weakens drastically with every subsequent millimeter of gap. Note that even the smallest gap (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnetic products work most effectively in perfect adhesion; gap weakens the force. Observe how quickly the pull force drop, when the product does not touch tightly to the steel surface. When designing the arrangement, discard additional spacers.

Table 2: Slippage load (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 pounds
558.0 g / 5.5 N
1 mm Stal (~0.2) 0.49 kg / 1.08 pounds
490.0 g / 4.8 N
2 mm Stal (~0.2) 0.43 kg / 0.94 pounds
426.0 g / 4.2 N
3 mm Stal (~0.2) 0.37 kg / 0.81 pounds
368.0 g / 3.6 N
5 mm Stal (~0.2) 0.27 kg / 0.59 pounds
268.0 g / 2.6 N
10 mm Stal (~0.2) 0.11 kg / 0.25 pounds
114.0 g / 1.1 N
15 mm Stal (~0.2) 0.05 kg / 0.11 pounds
48.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section defines the approximate force necessary to initiate the shifting of the magnet down along a vertical steel plate (assuming standard friction). The holding force varies with the distance between the magnet and the surface.

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 pounds
837.0 g / 8.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.56 kg / 1.23 pounds
558.0 g / 5.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.28 kg / 0.62 pounds
279.0 g / 2.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.40 kg / 3.08 pounds
1395.0 g / 13.7 N
When mounting a holder on a upright wall (e.g., a car body), it you can count on barely about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that holders slip faster than they pull off. Designing a hanger? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a much lighter load. Using a rubber coating can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - 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 pounds
279.0 g / 2.7 N
1 mm
25%
 0.70 kg / 1.54 pounds
697.5 g / 6.8 N
2 mm
50%
 1.40 kg / 3.08 pounds
1395.0 g / 13.7 N
3 mm
75%
 2.09 kg / 4.61 pounds
2092.5 g / 20.5 N
5 mm
100%
 2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
10 mm
100%
 2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
11 mm
100%
 2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
12 mm
100%
 2.79 kg / 6.15 pounds
2790.0 g / 27.4 N
A too thin steel is not enough to focus the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's power, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the holder holds weaker. We recommend selecting the steel thickness from these parameters.

Table 5: Thermal resistance (stability) - 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 pounds
2790.0 g / 27.4 N
 OK
40 °C -2.2% 2.73 kg / 6.02 pounds
2728.6 g / 26.8 N
 OK
60 °C -4.4% 2.67 kg / 5.88 pounds
2667.2 g / 26.2 N
 OK
80 °C -6.6% 2.61 kg / 5.74 pounds
2605.9 g / 25.6 N
100 °C -28.8% 1.99 kg / 4.38 pounds
1986.5 g / 19.5 N
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Avoid high temperatures – high temperature can permanently destroy this product. With increasing heat, the neodymium's force briefly drops. Do not use this magnet near heat sources exceeding its safe range. Too high temperature will cause destruction of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
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 pounds
6 014 Gs
19.32 kg / 42.59 pounds
19317 g / 189.5 N
 N/A
1 mm 120.86 kg / 266.44 pounds
10 757 Gs
18.13 kg / 39.97 pounds
18128 g / 177.8 N
 108.77 kg / 239.80 pounds
~0 Gs
2 mm 113.03 kg / 249.19 pounds
10 403 Gs
16.95 kg / 37.38 pounds
16954 g / 166.3 N
 101.73 kg / 224.27 pounds
~0 Gs
3 mm 105.49 kg / 232.56 pounds
10 050 Gs
15.82 kg / 34.88 pounds
15823 g / 155.2 N
 94.94 kg / 209.31 pounds
~0 Gs
5 mm 91.34 kg / 201.37 pounds
9 352 Gs
13.70 kg / 30.21 pounds
13701 g / 134.4 N
 82.21 kg / 181.23 pounds
~0 Gs
10 mm 61.88 kg / 136.41 pounds
7 697 Gs
9.28 kg / 20.46 pounds
9281 g / 91.0 N
 55.69 kg / 122.77 pounds
~0 Gs
20 mm 26.38 kg / 58.16 pounds
5 026 Gs
3.96 kg / 8.72 pounds
3957 g / 38.8 N
 23.74 kg / 52.35 pounds
~0 Gs
50 mm 2.35 kg / 5.17 pounds
1 499 Gs
0.35 kg / 0.78 pounds
352 g / 3.5 N
 2.11 kg / 4.66 pounds
~0 Gs
60 mm 1.19 kg / 2.63 pounds
1 069 Gs
0.18 kg / 0.39 pounds
179 g / 1.8 N
 1.07 kg / 2.37 pounds
~0 Gs
70 mm 0.65 kg / 1.42 pounds
786 Gs
0.10 kg / 0.21 pounds
97 g / 1.0 N
 0.58 kg / 1.28 pounds
~0 Gs
80 mm 0.37 kg / 0.81 pounds
594 Gs
0.06 kg / 0.12 pounds
55 g / 0.5 N
 0.33 kg / 0.73 pounds
~0 Gs
90 mm 0.22 kg / 0.49 pounds
459 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
 0.20 kg / 0.44 pounds
~0 Gs
100 mm 0.14 kg / 0.30 pounds
362 Gs
0.02 kg / 0.05 pounds
21 g / 0.2 N
 0.12 kg / 0.27 pounds
~0 Gs
Two strong neodymiums attract each other from a wider radius than a neodymium and metal setup. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is extreme. The repulsion force is marginally weaker than the connection force, but still significant.
*Field value in repulsion mode reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Estimates demonstrate sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
Mobile device 40 Gs (4.0 mT) 9.5 cm
Remote 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
A strong magnetic field is a serious hazard to electronic devices as well as medical implants. These neodymiums generate a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MP 32x16x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.53 km/h
(4.59 m/s)
 0.14 J
30 mm 18.30 km/h
(5.08 m/s)
 0.18 J
50 mm 18.40 km/h
(5.11 m/s)
 0.18 J
100 mm 18.42 km/h
(5.12 m/s)
 0.18 J
Neodymium magnets are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when playing with powerful specimens.

Table 9: Coating parameters (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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MP 32x16x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 38 808 Mx 388.1 µWb
Pc Coefficient 0.90 High (Stable)
Flux value emitted by the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

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.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

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

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Power loss vs temp

*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

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 and environmental data

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
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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. Mounting is clean and reversible, unlike gluing. This product with a force of 2.79 kg works great as a cabinet closure, speaker holder, or mounting 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 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 is not sufficient for rain. 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 magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 16 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. 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 lifting capacity amounting to approximately 2.79 kg (force ~27.40 N). 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. 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.

Pros and cons of neodymium magnets.

Strengths

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They have constant strength, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to weakening of magnetic properties when exposed to external fields,
  • In other words, due to the aesthetic surface of nickel, the element is aesthetically pleasing,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • In view of the ability of flexible molding and customization to unique solutions, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which amplifies use scope,
  • Fundamental importance in future technologies – they are used in mass storage devices, brushless drives, medical equipment, and other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their strength 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 resistant to moisture, in case of application outdoors
  • Limited possibility of creating nuts in the magnet and complicated forms - recommended is cover - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products are able to complicate diagnosis medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Detachment force of the magnet in optimal conditions – what affects it?

The load parameter shown represents the limit force, obtained under optimal environment, namely:
  • using a plate made of mild steel, functioning as a ideal flux conductor
  • with a thickness of at least 10 mm
  • with an polished contact surface
  • with direct contact (no impurities)
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

It is worth knowing that the application force will differ subject to elements below, in order of importance:
  • Distance (betwixt the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity 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 limits the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Moreover, even a small distance between the magnet and the plate reduces the load capacity.

H&S for magnets
Product not for children

NdFeB magnets are not suitable for play. Swallowing a few magnets can lead to them pinching intestinal walls, which poses a critical condition and necessitates urgent medical intervention.

Thermal limits

Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. Damage is permanent.

Protective goggles

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Data carriers

Equipment safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Phone sensors

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

Metal Allergy

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

Serious injuries

Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Machining danger

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Respect the power

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Life threat

Life threat: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Important! More info about hazards in the article: Magnet Safety Guide.