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MP 25x8x5 / N38 - ring magnet

ring magnet

Catalog no 030196

GTIN/EAN: 5906301812135

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

16.52 g

Magnetization Direction

↑ axial

Load capacity

7.16 kg / 70.21 N

Magnetic Induction

230.20 mT / 2302 Gs

Coating

[NiCuNi] Nickel

technical parameters »

5.90 ZŁ with VAT / pcs + price for transport

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Product card - MP 25x8x5 / N38 - ring magnet

Specification / characteristics - MP 25x8x5 / N38 - ring magnet

properties
properties values
Cat. no. 030196
GTIN/EAN 5906301812135
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 25 mm [±0,1 mm]
internal diameter Ø 8 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 16.52 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.16 kg / 70.21 N
Magnetic Induction ~ ? 230.20 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x8x5 / 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 magnet - data

Presented values represent the direct effect of a physical analysis. Values are based on models for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - power drop
MP 25x8x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 7.16 kg / 15.79 lbs
7160.0 g / 70.2 N
 medium risk
1 mm 5310 Gs
531.0 mT
 6.05 kg / 13.33 lbs
6048.6 g / 59.3 N
 medium risk
2 mm 4846 Gs
484.6 mT
 5.04 kg / 11.10 lbs
5036.9 g / 49.4 N
 medium risk
3 mm 4397 Gs
439.7 mT
 4.15 kg / 9.15 lbs
4148.2 g / 40.7 N
 medium risk
5 mm 3576 Gs
357.6 mT
 2.74 kg / 6.05 lbs
2743.2 g / 26.9 N
 medium risk
10 mm 2073 Gs
207.3 mT
 0.92 kg / 2.03 lbs
921.6 g / 9.0 N
 weak grip
15 mm 1231 Gs
123.1 mT
 0.33 kg / 0.72 lbs
325.2 g / 3.2 N
 weak grip
20 mm 773 Gs
77.3 mT
 0.13 kg / 0.28 lbs
128.0 g / 1.3 N
 weak grip
30 mm 356 Gs
35.6 mT
 0.03 kg / 0.06 lbs
27.2 g / 0.3 N
 weak grip
50 mm 115 Gs
11.5 mT
 0.00 kg / 0.01 lbs
2.8 g / 0.0 N
 weak grip
Pulling power decreases significantly with every subsequent millimeter of gap. Note that even a very thin break (e.g., dirt, paint, veneer) significantly reduces the pull force. Neodymiums work most effectively in perfect adhesion; gap drastically cuts the power. See how quickly the load capacity plummet, when the product does not touch tightly to the metal substrate. When calculating the mounting, avoid unnecessary gaps.

Table 2: Vertical force (vertical surface)
MP 25x8x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.43 kg / 3.16 lbs
1432.0 g / 14.0 N
1 mm Stal (~0.2) 1.21 kg / 2.67 lbs
1210.0 g / 11.9 N
2 mm Stal (~0.2) 1.01 kg / 2.22 lbs
1008.0 g / 9.9 N
3 mm Stal (~0.2) 0.83 kg / 1.83 lbs
830.0 g / 8.1 N
5 mm Stal (~0.2) 0.55 kg / 1.21 lbs
548.0 g / 5.4 N
10 mm Stal (~0.2) 0.18 kg / 0.41 lbs
184.0 g / 1.8 N
15 mm Stal (~0.2) 0.07 kg / 0.15 lbs
66.0 g / 0.6 N
20 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 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
This section presents the theoretical shear load required to initiate the sliding of the magnet vertically along a upright steel wall (assuming typical friction). The holding force is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 25x8x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.15 kg / 4.74 lbs
2148.0 g / 21.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.43 kg / 3.16 lbs
1432.0 g / 14.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.72 kg / 1.58 lbs
716.0 g / 7.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.58 kg / 7.89 lbs
3580.0 g / 35.1 N
When hanging a magnet on a vertical wall (e.g., a fridge), it will maintain only approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient cause that products move down faster than they detach. Planning a wall mount? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will give way down under a significantly smaller cargo. Using a rubber coating can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MP 25x8x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.72 kg / 1.58 lbs
716.0 g / 7.0 N
1 mm
25%
 1.79 kg / 3.95 lbs
1790.0 g / 17.6 N
2 mm
50%
 3.58 kg / 7.89 lbs
3580.0 g / 35.1 N
3 mm
75%
 5.37 kg / 11.84 lbs
5370.0 g / 52.7 N
5 mm
100%
 7.16 kg / 15.79 lbs
7160.0 g / 70.2 N
10 mm
100%
 7.16 kg / 15.79 lbs
7160.0 g / 70.2 N
11 mm
100%
 7.16 kg / 15.79 lbs
7160.0 g / 70.2 N
12 mm
100%
 7.16 kg / 15.79 lbs
7160.0 g / 70.2 N
A thin sheet is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the field will pass right through and the pull force will drop sharply. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid piece of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel dimension according to the table below.

Table 5: Working in heat (stability) - thermal limit
MP 25x8x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.16 kg / 15.79 lbs
7160.0 g / 70.2 N
 OK
40 °C -2.2% 7.00 kg / 15.44 lbs
7002.5 g / 68.7 N
 OK
60 °C -4.4% 6.84 kg / 15.09 lbs
6845.0 g / 67.1 N
 OK
80 °C -6.6% 6.69 kg / 14.74 lbs
6687.4 g / 65.6 N
100 °C -28.8% 5.10 kg / 11.24 lbs
5097.9 g / 50.0 N
Ordinary NdFeB products irreversibly lose parameters past the thermal threshold. Avoid high temperatures – heat can permanently destroy this magnet. With increasing heat, the magnet's force briefly drops. Avoid using this product close to ovens higher than its operating temperature limit. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently sooner than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MP 25x8x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 82.42 kg / 181.72 lbs
6 082 Gs
12.36 kg / 27.26 lbs
12364 g / 121.3 N
 N/A
1 mm 75.95 kg / 167.44 lbs
11 091 Gs
11.39 kg / 25.12 lbs
11392 g / 111.8 N
 68.35 kg / 150.69 lbs
~0 Gs
2 mm 69.63 kg / 153.51 lbs
10 620 Gs
10.44 kg / 23.03 lbs
10445 g / 102.5 N
 62.67 kg / 138.16 lbs
~0 Gs
3 mm 63.64 kg / 140.29 lbs
10 153 Gs
9.55 kg / 21.04 lbs
9545 g / 93.6 N
 57.27 kg / 126.26 lbs
~0 Gs
5 mm 52.69 kg / 116.16 lbs
9 238 Gs
7.90 kg / 17.42 lbs
7903 g / 77.5 N
 47.42 kg / 104.54 lbs
~0 Gs
10 mm 31.58 kg / 69.62 lbs
7 152 Gs
4.74 kg / 10.44 lbs
4737 g / 46.5 N
 28.42 kg / 62.66 lbs
~0 Gs
20 mm 10.61 kg / 23.39 lbs
4 145 Gs
1.59 kg / 3.51 lbs
1591 g / 15.6 N
 9.55 kg / 21.05 lbs
~0 Gs
50 mm 0.65 kg / 1.43 lbs
1 024 Gs
0.10 kg / 0.21 lbs
97 g / 1.0 N
 0.58 kg / 1.28 lbs
~0 Gs
60 mm 0.31 kg / 0.69 lbs
712 Gs
0.05 kg / 0.10 lbs
47 g / 0.5 N
 0.28 kg / 0.62 lbs
~0 Gs
70 mm 0.16 kg / 0.36 lbs
514 Gs
0.02 kg / 0.05 lbs
24 g / 0.2 N
 0.15 kg / 0.32 lbs
~0 Gs
80 mm 0.09 kg / 0.20 lbs
383 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
 0.08 kg / 0.18 lbs
~0 Gs
90 mm 0.05 kg / 0.12 lbs
293 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
230 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
Two magnetic products interact from a wider radius than a magnet and steel combination. The setup of two magnets creates a more powerful interaction and a larger range of action. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is huge. The repulsion force is marginally weaker than the attraction, but still impressive.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Important: Estimates show sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - warnings
MP 25x8x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 17.0 cm
Hearing aid 10 Gs (1.0 mT) 13.5 cm
Timepiece 20 Gs (2.0 mT) 10.5 cm
Mobile device 40 Gs (4.0 mT) 8.0 cm
Car key 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Powerful magnet radiation is a large risk to electronics as well as medical implants. These magnets produce a field that prevents correct functioning of digital equipment. Be aware: the unseen radiation penetrates the body and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MP 25x8x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.62 km/h
(6.28 m/s)
 0.33 J
30 mm 36.45 km/h
(10.13 m/s)
 0.85 J
50 mm 46.96 km/h
(13.04 m/s)
 1.41 J
100 mm 66.40 km/h
(18.44 m/s)
 2.81 J
Neodymium magnets are delicate – a strong collision with metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Impact energy can cause material chips or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Anti-corrosion coating durability
MP 25x8x5 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MP 25x8x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 536 Mx 245.4 µWb
Pc Coefficient 1.03 High (Stable)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 25x8x5 / N38

Environment Effective steel pull Effect
Air (land) 7.16 kg Standard
Water (riverbed) 8.20 kg
(+1.04 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. Vertical hold

*Caution: On a vertical wall, the magnet retains just ~20% of its max power.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC 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) = 1.03

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: 030196-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
Insert your figure in one of the inputs, and the remaining units will convert instantly.

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The ring magnet with a hole MP 25x8x5 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 7.16 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 25x8x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. 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. 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. Aesthetic mounting requires selecting the appropriate head size.
This model is characterized by dimensions Ø25x5 mm and a weight of 16.52 g. The pulling force of this model is an impressive 7.16 kg, which translates to 70.21 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8 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 neodymium magnets.

Pros

Apart from their strong holding force, neodymium magnets have these key benefits:
  • Their power remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
  • Magnets effectively resist against loss of magnetization caused by external fields,
  • A magnet with a shiny gold surface has better aesthetics,
  • Magnetic induction on the surface of the magnet is very high,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the possibility of free molding and adaptation to unique needs, neodymium magnets can be modeled in a wide range of forms and dimensions, which increases their versatility,
  • Wide application in modern industrial fields – they serve a role in HDD drives, drive modules, diagnostic systems, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in small systems

Limitations

Cons of neodymium magnets and proposals for their use:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. 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 power. Often, when the temperature exceeds 80°C, their strength 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 rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complicated forms - recommended is cover - magnet mounting.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameters – what contributes to it?

The force parameter is a theoretical maximum value conducted under standard conditions:
  • using a base made of mild steel, serving as a magnetic yoke
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by even structure
  • without the slightest air gap between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • at standard ambient temperature

What influences lifting capacity in practice

Bear in mind that the magnet holding may be lower influenced by the following factors, in order of importance:
  • Distance (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate reduces the holding force.

Warnings
Heat sensitivity

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Serious injuries

Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Flammability

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Magnet fragility

NdFeB magnets are ceramic materials, which means they are very brittle. Impact of two magnets leads to them breaking into shards.

Danger to pacemakers

People with a ICD should keep an absolute distance from magnets. The magnetism can disrupt the functioning of the implant.

Conscious usage

Use magnets with awareness. Their immense force can shock even experienced users. Plan your moves and respect their power.

Threat to electronics

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Swallowing risk

These products are not intended for children. Swallowing multiple magnets can lead to them pinching intestinal walls, which poses a critical condition and necessitates urgent medical intervention.

GPS Danger

Note: rare earth magnets generate a field that disrupts precision electronics. Keep a safe distance from your phone, device, and GPS.

Warning for allergy sufferers

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop handling magnets and use protective gear.

Safety First! Need more info? Read our article: Are neodymium magnets dangerous?