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MP 24x16x2 / N38 - ring magnet

ring magnet

Catalog no 030495

GTIN/EAN: 5906301812364

5.00
Load capacity 0.94 kg / 9.22 N Magnetic Induction 101.91 mT / 1019 Gs
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
Coating
[NiCuNi] Nickel
product specifications »

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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.

PDF report Calculator
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Product card - 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 modeling of the assembly - report

These values represent the result of a engineering analysis. Values were calculated on algorithms for the class Nd2Fe14B. Operational conditions may differ. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
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
 low risk
1 mm 5318 Gs
531.8 mT
 0.79 kg / 1.74 LBS
788.4 g / 7.7 N
 low risk
2 mm 4833 Gs
483.3 mT
 0.65 kg / 1.44 LBS
651.1 g / 6.4 N
 low risk
3 mm 4366 Gs
436.6 mT
 0.53 kg / 1.17 LBS
531.5 g / 5.2 N
 low risk
5 mm 3517 Gs
351.7 mT
 0.34 kg / 0.76 LBS
344.9 g / 3.4 N
 low risk
10 mm 1995 Gs
199.5 mT
 0.11 kg / 0.24 LBS
111.0 g / 1.1 N
 low risk
15 mm 1168 Gs
116.8 mT
 0.04 kg / 0.08 LBS
38.0 g / 0.4 N
 low risk
20 mm 727 Gs
72.7 mT
 0.01 kg / 0.03 LBS
14.7 g / 0.1 N
 low risk
30 mm 332 Gs
33.2 mT
 0.00 kg / 0.01 LBS
3.1 g / 0.0 N
 low risk
50 mm 106 Gs
10.6 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 low risk
Pulling power weakens significantly per each millimeter of gap. Remember that every additional insulation layer (e.g., dirt, paint, dust) significantly weakens the grip. Magnets hold most effectively at the point of direct contact; air break drastically cuts the power. Notice how flashily the parameters plummet, when the product does not touch flatly to the metal substrate. When calculating the arrangement, eliminate unnecessary gaps.

Table 2: Slippage force (wall)
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 approximate holding capacity needed to cause the shifting of the magnet vertically along a upright steel wall (assuming standard friction). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 hanging a element on a vertical wall (e.g., a car body), it you can count on only about 20%-30% of its nominal power. Gravity and a weak degree of grip cause that magnets slide down easier than they pop off the substrate. Planning a wall mount? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a much lighter cargo. Application of an anti-slip coating can drastically improve the result.

Table 4: Steel thickness (saturation) - 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 too thin steel is not enough to conduct the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the holding will be smaller. To utilize the maximum of this magnet's potential, you need a suitably thick piece of metal. The material oversaturation causes that on thin elements (e.g., thin profiles), the holder works worse. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
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
Standard neodymium magnets lose strength past the thermal threshold. Avoid high temperatures – heat can irreversibly damage this magnet. As the temperature rises, the neodymium's power briefly drops. Do not use this magnet near heat sources exceeding its safe range. Ignoring the limit will cause destruction of magnetism.
*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 24x16x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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 strong neodymiums interact from a significantly greater distance than a neodymium and metal setup. The connection of two magnets creates a more powerful interaction and a further horizon of operation. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is massive. The levitation is a bit weaker than the attraction, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Important: Calculations apply to sliding force of two matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

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
Timepiece 20 Gs (2.0 mT) 10.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Car key 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
A strong magnetic field is a real danger to electronics and pacemakers. These neodymiums generate a field that disrupts operation of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MP 24x16x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.57 km/h
(4.60 m/s)
 0.04 J
30 mm 17.61 km/h
(4.89 m/s)
 0.05 J
50 mm 17.66 km/h
(4.91 m/s)
 0.05 J
100 mm 17.67 km/h
(4.91 m/s)
 0.05 J
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Striking energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

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)
Total magnetic flux emitted by the magnet pole. Essential parameter when building generators and motors. Pc value 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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Warning: On a vertical wall, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*For N38 grade, 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.

Technical specification and ecology

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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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 0.94 kg works great as a door latch, speaker holder, or mounting element in devices.
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. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force 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. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. 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. 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 (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 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages and disadvantages of rare earth magnets.

Pros

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They retain magnetic properties for around ten years – the loss is just ~1% (based on simulations),
  • They possess excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • A magnet with a smooth silver surface looks better,
  • Neodymium magnets generate maximum magnetic induction on a small area, which allows for strong attraction,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Thanks to modularity in designing and the capacity to adapt to individual projects,
  • Fundamental importance in innovative solutions – they are utilized in hard drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: application proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as 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 - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using a housing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a result of laboratory testing performed under specific, ideal conditions:
  • with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with a plane free of scratches
  • with zero gap (without paint)
  • under perpendicular force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Bear in mind that the application force may be lower depending on elements below, starting with the most relevant:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Compass and GPS

GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Warning for heart patients

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

This is not a toy

Only for adults. Tiny parts can be swallowed, leading to severe trauma. Store out of reach of kids and pets.

Flammability

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Beware of splinters

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Keep away from computers

Powerful magnetic fields can erase data on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Crushing force

Risk of injury: The attraction force is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Skin irritation risks

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact or choose encased magnets.

Demagnetization risk

Standard neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Powerful field

Handle magnets with awareness. Their immense force can surprise even experienced users. Stay alert and do not underestimate their power.

Important! More info about hazards in the article: Safety of working with magnets.