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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

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5.24 ZŁ with VAT / pcs + price for transport

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Technical - 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 magnet - data

Presented values constitute the outcome of a mathematical analysis. Values are based on models for the class Nd2Fe14B. Operational conditions might slightly differ. Use these data as a supplementary guide for designers.

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 pounds
2790.0 g / 27.4 N
 strong
1 mm 5202 Gs
520.2 mT
 2.45 kg / 5.40 pounds
2448.8 g / 24.0 N
 strong
2 mm 4850 Gs
485.0 mT
 2.13 kg / 4.69 pounds
2128.7 g / 20.9 N
 strong
3 mm 4504 Gs
450.4 mT
 1.84 kg / 4.05 pounds
1836.3 g / 18.0 N
 safe
5 mm 3849 Gs
384.9 mT
 1.34 kg / 2.96 pounds
1340.5 g / 13.2 N
 safe
10 mm 2513 Gs
251.3 mT
 0.57 kg / 1.26 pounds
571.6 g / 5.6 N
 safe
15 mm 1633 Gs
163.3 mT
 0.24 kg / 0.53 pounds
241.2 g / 2.4 N
 safe
20 mm 1087 Gs
108.7 mT
 0.11 kg / 0.24 pounds
107.0 g / 1.0 N
 safe
30 mm 535 Gs
53.5 mT
 0.03 kg / 0.06 pounds
25.9 g / 0.3 N
 safe
50 mm 181 Gs
18.1 mT
 0.00 kg / 0.01 pounds
3.0 g / 0.0 N
 safe
Pulling power drops significantly with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., contamination, paint, dust) noticeably reduces the pull force. Neodymiums operate most effectively at the point of direct contact; air break nullifies the power. Analyze how rapidly the parameters drop, when the magnet does not touch directly to the metal substrate. When planning the arrangement, avoid additional spacers.

Table 2: Shear 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 presents the theoretical holding capacity required to initiate the slippage of the magnet down against a vertical metal surface (assuming typical friction coefficient). This value varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
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 vertical plane (e.g., a board), it will only hold only approx. 1/5 of its nominal power. Gravitational force and a weak degree of grip influence the fact that products slip easier than they detach. Want to create a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a painted metal, the element will give way down under a noticeably lighter cargo. Utilizing a rubberized pad can drastically 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 thin metal plate is not enough to take in the full magnetic flux, which squanders power of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid backing of metal. The material oversaturation means that on delicate walls (e.g., thin profiles), the product shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Thermal stability (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
Ordinary NdFeB products irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this magnet. With every degree above norm, the neodymium's capacity momentarily drops. Refrain from using this product in hot environments higher than its operating temperature limit. Too high temperature will result in destruction of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - 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 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 much further distance than a magnet and steel setup. Such a system of magnet-to-magnet creates a more powerful interaction and a wider radius of operation. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
Note: Figures show sliding force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
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
Extremely neodym field is a large risk to electronics as well as medical implants. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field acts through matter and plastic. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (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
Neodymium magnets are very brittle – a collision with steel causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to fingers. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
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)
The following table defines the conditions under which this product can be safely used. 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)
Total magnetic flux passing through the pole surface. Key data for generator designers as well as sensors. The Pc coefficient defines the working geometry.

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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*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

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
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
Measurement Calculator
Force (pull)
Magnetic Induction
Put a figure in a single field to see the conversion for the other units at once.

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The ring-shaped magnet MP 32x16x3 / N38 is created for mechanical fastening, where glue might fail or be insufficient. 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 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. 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 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.
It is a magnetic ring with a diameter of 32 mm and thickness 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.
The poles are located on the planes with holes, not on the sides of the ring. 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 and disadvantages of Nd2Fe14B magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their strength is durable, and after around 10 years it decreases only by ~1% (theoretically),
  • Neodymium magnets are remarkably resistant to demagnetization caused by magnetic disturbances,
  • A magnet with a metallic nickel surface looks better,
  • Magnetic induction on the surface of the magnet turns out to be exceptional,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of custom forming and adapting to atypical applications,
  • Key role in high-tech industry – they are utilized in HDD drives, electric motors, diagnostic systems, and modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Cons of neodymium magnets and proposals for their use:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited possibility of producing nuts in the magnet and complex shapes - preferred is a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

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

The declared magnet strength refers to the maximum value, recorded under laboratory conditions, specifically:
  • using a base made of high-permeability steel, serving as a magnetic yoke
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by lack of roughness
  • without any clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Key elements affecting lifting force

During everyday use, the actual lifting capacity depends on a number of factors, presented from the most important:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be lost into the air.
  • Steel type – mild steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets
Magnetic interference

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, device, and navigation systems.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness happens, cease handling magnets and use protective gear.

Dust explosion hazard

Dust created during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Electronic hazard

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Serious injuries

Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Conscious usage

Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Keep away from children

Absolutely store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.

Thermal limits

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Magnets are brittle

Protect your eyes. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

Health Danger

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Danger! Learn more about risks in the article: Magnet Safety Guide.