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MP 24x16x2 / N38 - ring magnet

ring magnet

Catalog no 030495

GTIN/EAN: 5906301812364

5.00

Diameter

24 mm [±0,1 mm]

internal diameter Ø

16 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

3.77 g

Magnetization Direction

↑ axial

Load capacity

0.94 kg / 9.22 N

Magnetic Induction

101.91 mT / 1019 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

3.69 ZŁ with VAT / pcs + price for transport

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Technical - MP 24x16x2 / N38 - ring magnet

Specification / characteristics - MP 24x16x2 / N38 - ring magnet

properties
properties values
Cat. no. 030495
GTIN/EAN 5906301812364
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 24 mm [±0,1 mm]
internal diameter Ø 16 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 3.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.94 kg / 9.22 N
Magnetic Induction ~ ? 101.91 mT / 1019 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 24x16x2 / 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 simulation of the magnet - data

Presented values constitute the result of a mathematical analysis. Results were calculated on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these data as a reference point for designers.

Table 1: Static pull force (pull vs distance) - characteristics
MP 24x16x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5807 Gs
580.7 mT
 0.94 kg / 2.07 lbs
940.0 g / 9.2 N
 weak grip
1 mm 5318 Gs
531.8 mT
 0.79 kg / 1.74 lbs
788.4 g / 7.7 N
 weak grip
2 mm 4833 Gs
483.3 mT
 0.65 kg / 1.44 lbs
651.1 g / 6.4 N
 weak grip
3 mm 4366 Gs
436.6 mT
 0.53 kg / 1.17 lbs
531.5 g / 5.2 N
 weak grip
5 mm 3517 Gs
351.7 mT
 0.34 kg / 0.76 lbs
344.9 g / 3.4 N
 weak grip
10 mm 1995 Gs
199.5 mT
 0.11 kg / 0.24 lbs
111.0 g / 1.1 N
 weak grip
15 mm 1168 Gs
116.8 mT
 0.04 kg / 0.08 lbs
38.0 g / 0.4 N
 weak grip
20 mm 727 Gs
72.7 mT
 0.01 kg / 0.03 lbs
14.7 g / 0.1 N
 weak grip
30 mm 332 Gs
33.2 mT
 0.00 kg / 0.01 lbs
3.1 g / 0.0 N
 weak grip
50 mm 106 Gs
10.6 mT
 0.00 kg / 0.00 lbs
0.3 g / 0.0 N
 weak grip
Grip strength decreases sharply with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., dirt, varnish, rust) noticeably diminishes the holding power. Magnetic products hold strongest in perfect adhesion; distance drastically cuts the force. Observe how quickly the parameters drop, when the product does not touch tightly to the steel surface. When calculating the arrangement, discard unnecessary gaps.

Table 2: Shear capacity (vertical surface)
MP 24x16x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.41 lbs
188.0 g / 1.8 N
1 mm Stal (~0.2) 0.16 kg / 0.35 lbs
158.0 g / 1.5 N
2 mm Stal (~0.2) 0.13 kg / 0.29 lbs
130.0 g / 1.3 N
3 mm Stal (~0.2) 0.11 kg / 0.23 lbs
106.0 g / 1.0 N
5 mm Stal (~0.2) 0.07 kg / 0.15 lbs
68.0 g / 0.7 N
10 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below calculates the estimated force needed to cause the shifting of the magnet down against a upright metal surface (considering typical friction coefficient). This parameter varies with the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 24x16x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.28 kg / 0.62 lbs
282.0 g / 2.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.41 lbs
188.0 g / 1.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.09 kg / 0.21 lbs
94.0 g / 0.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.47 kg / 1.04 lbs
470.0 g / 4.6 N
When placing a holder on a vertical plane (e.g., a board), it you can count on just approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient influence the fact that holders move down easier than they detach. Designing a wall mount? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will give way down under a significantly smaller weight. Using a rubber coating can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MP 24x16x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.09 kg / 0.21 lbs
94.0 g / 0.9 N
1 mm
25%
 0.24 kg / 0.52 lbs
235.0 g / 2.3 N
2 mm
50%
 0.47 kg / 1.04 lbs
470.0 g / 4.6 N
3 mm
75%
 0.71 kg / 1.55 lbs
705.0 g / 6.9 N
5 mm
100%
 0.94 kg / 2.07 lbs
940.0 g / 9.2 N
10 mm
100%
 0.94 kg / 2.07 lbs
940.0 g / 9.2 N
11 mm
100%
 0.94 kg / 2.07 lbs
940.0 g / 9.2 N
12 mm
100%
 0.94 kg / 2.07 lbs
940.0 g / 9.2 N
A thin sheet is not enough to conduct the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a thin surface, the field will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's power, you need a suitably thick element of steel. The saturation effect means that on sheet metal structures (e.g., car bodies), the product works worse. We advise picking the steel dimension based on the following data.

Table 5: Thermal stability (material behavior) - resistance threshold
MP 24x16x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.94 kg / 2.07 lbs
940.0 g / 9.2 N
 OK
40 °C -2.2% 0.92 kg / 2.03 lbs
919.3 g / 9.0 N
 OK
60 °C -4.4% 0.90 kg / 1.98 lbs
898.6 g / 8.8 N
 OK
80 °C -6.6% 0.88 kg / 1.94 lbs
878.0 g / 8.6 N
100 °C -28.8% 0.67 kg / 1.48 lbs
669.3 g / 6.6 N
Ordinary NdFeB products change their properties parameters after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's force momentarily decreases. Avoid using this product near heat sources exceeding its operating temperature limit. Ignoring the limit will lead to destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MP 24x16x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 79.38 kg / 175.01 lbs
6 091 Gs
11.91 kg / 26.25 lbs
11908 g / 116.8 N
 N/A
1 mm 72.89 kg / 160.70 lbs
11 129 Gs
10.93 kg / 24.11 lbs
10934 g / 107.3 N
 65.60 kg / 144.63 lbs
~0 Gs
2 mm 66.58 kg / 146.78 lbs
10 636 Gs
9.99 kg / 22.02 lbs
9987 g / 98.0 N
 59.92 kg / 132.10 lbs
~0 Gs
3 mm 60.60 kg / 133.60 lbs
10 147 Gs
9.09 kg / 20.04 lbs
9090 g / 89.2 N
 54.54 kg / 120.24 lbs
~0 Gs
5 mm 49.75 kg / 109.67 lbs
9 194 Gs
7.46 kg / 16.45 lbs
7462 g / 73.2 N
 44.77 kg / 98.70 lbs
~0 Gs
10 mm 29.13 kg / 64.21 lbs
7 035 Gs
4.37 kg / 9.63 lbs
4369 g / 42.9 N
 26.21 kg / 57.79 lbs
~0 Gs
20 mm 9.37 kg / 20.67 lbs
3 991 Gs
1.41 kg / 3.10 lbs
1406 g / 13.8 N
 8.44 kg / 18.60 lbs
~0 Gs
50 mm 0.54 kg / 1.19 lbs
958 Gs
0.08 kg / 0.18 lbs
81 g / 0.8 N
 0.49 kg / 1.07 lbs
~0 Gs
60 mm 0.26 kg / 0.57 lbs
663 Gs
0.04 kg / 0.09 lbs
39 g / 0.4 N
 0.23 kg / 0.51 lbs
~0 Gs
70 mm 0.13 kg / 0.30 lbs
478 Gs
0.02 kg / 0.04 lbs
20 g / 0.2 N
 0.12 kg / 0.27 lbs
~0 Gs
80 mm 0.07 kg / 0.16 lbs
356 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.07 kg / 0.15 lbs
~0 Gs
90 mm 0.04 kg / 0.10 lbs
272 Gs
0.01 kg / 0.01 lbs
7 g / 0.1 N
 0.04 kg / 0.09 lbs
~0 Gs
100 mm 0.03 kg / 0.06 lbs
213 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
Two magnetic products interact from a much further distance than a magnet and steel setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of action. Want to build a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is extreme. The levitation is slightly lower than the attraction, but still large.
*Field value for N-N configuration reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Note: Calculations refer to friction force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - precautionary measures
MP 24x16x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.5 cm
Hearing aid 10 Gs (1.0 mT) 13.0 cm
Mechanical watch 20 Gs (2.0 mT) 10.0 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field poses a serious hazard to IT equipment and pacemakers. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MP 24x16x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.06 km/h
(4.74 m/s)
 0.04 J
30 mm 27.64 km/h
(7.68 m/s)
 0.11 J
50 mm 35.62 km/h
(9.89 m/s)
 0.18 J
100 mm 50.36 km/h
(13.99 m/s)
 0.37 J
Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Surface protection spec
MP 24x16x2 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MP 24x16x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 520 Mx 235.2 µWb
Pc Coefficient 1.04 High (Stable)
Flux value passing through the magnet pole. Key data in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 24x16x2 / N38

Environment Effective steel pull Effect
Air (land) 0.94 kg Standard
Water (riverbed) 1.08 kg
(+0.14 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains merely ~20% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.04

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.

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%
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: 030495-2026
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The ring-shaped magnet MP 24x16x2 / 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 is a crucial issue when working with model MP 24x16x2 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. 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. If you must use it outside, paint it with anti-corrosion paint after mounting.
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 (24 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 24 mm and thickness 2 mm. The key parameter here is the lifting capacity amounting to approximately 0.94 kg (force ~9.22 N). 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. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their power remains stable, and after around 10 years it decreases only by ~1% (theoretically),
  • Neodymium magnets are distinguished by extremely resistant to magnetic field loss caused by external field sources,
  • By using a decorative layer of silver, the element has an professional look,
  • Magnets are distinguished by impressive magnetic induction on the active area,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in forming and the ability to customize to complex applications,
  • Fundamental importance in modern technologies – they serve a role in mass storage devices, electric motors, diagnostic systems, also industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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 oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

Information about lifting capacity was determined for optimal configuration, assuming:
  • with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • whose thickness is min. 10 mm
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Real force impacted by working environment parameters, such as (from most important):
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Steel type – mild steel gives the best results. Alloy steels decrease magnetic properties and holding force.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Protective goggles

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Caution required

Handle with care. Neodymium magnets act from a long distance and snap with huge force, often faster than you can react.

Product not for children

Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Keep away from children and animals.

Fire warning

Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Warning for allergy sufferers

Some people experience a sensitization to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to skin redness. It is best to wear safety gloves.

Magnetic media

Very strong magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Crushing force

Mind your fingers. Two powerful magnets will snap together immediately with a force of massive weight, crushing everything in their path. Be careful!

Life threat

Warning for patients: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Thermal limits

Keep cool. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Threat to navigation

Remember: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your phone, tablet, and GPS.

Safety First! Learn more about hazards in the article: Safety of working with magnets.