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MP 25x8x20 / N38 - ring magnet

ring magnet

Catalog no 030450

GTIN/EAN: 5906301812340

5.00
Load capacity 19.02 kg / 186.54 N Magnetic Induction 525.50 mT / 5255 Gs
Diameter
25 mm [±0,1 mm]
internal diameter Ø
8 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
66.09 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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Technical parameters of the product - MP 25x8x20 / N38 - ring magnet

Specification / characteristics - MP 25x8x20 / N38 - ring magnet

properties
properties values
Cat. no. 030450
GTIN/EAN 5906301812340
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 20 mm [±0,1 mm]
Weight 66.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.02 kg / 186.54 N
Magnetic Induction ~ ? 525.50 mT / 5255 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x8x20 / 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 magnet - technical parameters

These information constitute the result of a engineering analysis. Results were calculated on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - interaction chart
MP 25x8x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
 crushing
1 mm 5310 Gs
531.0 mT
 16.07 kg / 35.42 pounds
16067.7 g / 157.6 N
 crushing
2 mm 4846 Gs
484.6 mT
 13.38 kg / 29.50 pounds
13380.1 g / 131.3 N
 crushing
3 mm 4397 Gs
439.7 mT
 11.02 kg / 24.29 pounds
11019.3 g / 108.1 N
 crushing
5 mm 3576 Gs
357.6 mT
 7.29 kg / 16.07 pounds
7287.1 g / 71.5 N
 strong
10 mm 2073 Gs
207.3 mT
 2.45 kg / 5.40 pounds
2448.1 g / 24.0 N
 strong
15 mm 1231 Gs
123.1 mT
 0.86 kg / 1.90 pounds
863.8 g / 8.5 N
 safe
20 mm 773 Gs
77.3 mT
 0.34 kg / 0.75 pounds
340.1 g / 3.3 N
 safe
30 mm 356 Gs
35.6 mT
 0.07 kg / 0.16 pounds
72.1 g / 0.7 N
 safe
50 mm 115 Gs
11.5 mT
 0.01 kg / 0.02 pounds
7.5 g / 0.1 N
 safe
Magnetic force drops drastically with every subsequent millimeter of gap. Note that even a very thin break (e.g., contamination, paint, rust) noticeably reduces the pull force. Magnetic products work optimally at the point of direct contact; air break nullifies the force. See how quickly the load capacity plummet, when the magnet does not touch directly to the metal substrate. When calculating the arrangement, avoid additional spacers.

Table 2: Shear force (wall)
MP 25x8x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.80 kg / 8.39 pounds
3804.0 g / 37.3 N
1 mm Stal (~0.2) 3.21 kg / 7.09 pounds
3214.0 g / 31.5 N
2 mm Stal (~0.2) 2.68 kg / 5.90 pounds
2676.0 g / 26.3 N
3 mm Stal (~0.2) 2.20 kg / 4.86 pounds
2204.0 g / 21.6 N
5 mm Stal (~0.2) 1.46 kg / 3.21 pounds
1458.0 g / 14.3 N
10 mm Stal (~0.2) 0.49 kg / 1.08 pounds
490.0 g / 4.8 N
15 mm Stal (~0.2) 0.17 kg / 0.38 pounds
172.0 g / 1.7 N
20 mm Stal (~0.2) 0.07 kg / 0.15 pounds
68.0 g / 0.7 N
30 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
This section shows the approximate force necessary to cause the downward movement of the magnet vertically against a upright steel plate (considering typical friction). This value varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MP 25x8x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.71 kg / 12.58 pounds
5706.0 g / 56.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.80 kg / 8.39 pounds
3804.0 g / 37.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.90 kg / 4.19 pounds
1902.0 g / 18.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.51 kg / 20.97 pounds
9510.0 g / 93.3 N
When mounting a element on a vertical wall (e.g., a car body), it will only hold only approx. 1/5 of its maximum pull force. Gravity as well as a low friction coefficient cause that holders slide down faster than they detach. Designing a vertical fastening? Remember that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a much lighter load. Utilizing a rubberized coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MP 25x8x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.95 kg / 2.10 pounds
951.0 g / 9.3 N
1 mm
13%
 2.38 kg / 5.24 pounds
2377.5 g / 23.3 N
2 mm
25%
 4.76 kg / 10.48 pounds
4755.0 g / 46.6 N
3 mm
38%
 7.13 kg / 15.72 pounds
7132.5 g / 70.0 N
5 mm
63%
 11.89 kg / 26.21 pounds
11887.5 g / 116.6 N
10 mm
100%
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
11 mm
100%
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
12 mm
100%
 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
A too thin steel is unable to absorb the full magnetic flux, which squanders power of the magnet. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the attraction force will be weaker. To utilize full efficiency of this magnet's power, you need a suitably thick backing of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - power drop
MP 25x8x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.02 kg / 41.93 pounds
19020.0 g / 186.6 N
 OK
40 °C -2.2% 18.60 kg / 41.01 pounds
18601.6 g / 182.5 N
 OK
60 °C -4.4% 18.18 kg / 40.09 pounds
18183.1 g / 178.4 N
 OK
80 °C -6.6% 17.76 kg / 39.16 pounds
17764.7 g / 174.3 N
100 °C -28.8% 13.54 kg / 29.86 pounds
13542.2 g / 132.8 N
Standard neodymium magnets change their properties power above the temperature limit. Watch out for overheating – high temperature can irreversibly demagnetize this product. With increasing heat, the magnet's force temporarily drops. Do not use this magnet in hot environments exceeding its safe range. Too high temperature will cause permanent loss of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (pancake types) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MP 25x8x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 30.91 kg / 68.14 pounds
6 082 Gs
4.64 kg / 10.22 pounds
4636 g / 45.5 N
 N/A
1 mm 28.48 kg / 62.79 pounds
11 091 Gs
4.27 kg / 9.42 pounds
4272 g / 41.9 N
 25.63 kg / 56.51 pounds
~0 Gs
2 mm 26.11 kg / 57.57 pounds
10 620 Gs
3.92 kg / 8.63 pounds
3917 g / 38.4 N
 23.50 kg / 51.81 pounds
~0 Gs
3 mm 23.86 kg / 52.61 pounds
10 153 Gs
3.58 kg / 7.89 pounds
3580 g / 35.1 N
 21.48 kg / 47.35 pounds
~0 Gs
5 mm 19.76 kg / 43.56 pounds
9 238 Gs
2.96 kg / 6.53 pounds
2964 g / 29.1 N
 17.78 kg / 39.20 pounds
~0 Gs
10 mm 11.84 kg / 26.11 pounds
7 152 Gs
1.78 kg / 3.92 pounds
1776 g / 17.4 N
 10.66 kg / 23.50 pounds
~0 Gs
20 mm 3.98 kg / 8.77 pounds
4 145 Gs
0.60 kg / 1.32 pounds
597 g / 5.9 N
 3.58 kg / 7.89 pounds
~0 Gs
50 mm 0.24 kg / 0.54 pounds
1 024 Gs
0.04 kg / 0.08 pounds
36 g / 0.4 N
 0.22 kg / 0.48 pounds
~0 Gs
60 mm 0.12 kg / 0.26 pounds
712 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.23 pounds
~0 Gs
70 mm 0.06 kg / 0.13 pounds
514 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.06 kg / 0.12 pounds
~0 Gs
80 mm 0.03 kg / 0.07 pounds
383 Gs
0.01 kg / 0.01 pounds
5 g / 0.1 N
 0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.04 pounds
293 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
230 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a magnet and sheet setup. The connection of two magnets produces a massive flux and a larger range of action. Designing a strong closure? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The repulsion force is slightly lower than the connection force, but still impressive.
*Field value in repulsion mode reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
* Results show shear force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
MP 25x8x20 / 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
Remote 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
A strong magnetic field is a large risk to electronics as well as medical implants. These magnets produce a flux that prevents correct functioning of digital equipment. Notice: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MP 25x8x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.05 km/h
(5.01 m/s)
 0.83 J
30 mm 19.29 km/h
(5.36 m/s)
 0.95 J
50 mm 19.34 km/h
(5.37 m/s)
 0.95 J
100 mm 19.35 km/h
(5.38 m/s)
 0.95 J
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or injury to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when working with large magnets.

Table 9: Surface protection spec
MP 25x8x20 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MP 25x8x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 10 108 Mx 101.1 µWb
Pc Coefficient 1.25 High (Stable)
Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. Pc value defines the magnet's operating point.

Table 11: Physics of underwater searching
MP 25x8x20 / N38

Environment Effective steel pull Effect
Air (land) 19.02 kg Standard
Water (riverbed) 21.78 kg
(+2.76 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)

*Note: On a vertical surface, the magnet retains only ~20% of its max power.

2. Efficiency vs thickness

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

3. Thermal stability

*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) = 1.25

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

Material specification

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: 030450-2026
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The ring-shaped magnet MP 25x8x20 / 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 19.02 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 25x8x20 / 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. 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 rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 8 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 (25 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø25x20 mm and a weight of 66.09 g. The key parameter here is the holding force amounting to approximately 19.02 kg (force ~186.54 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8 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.

Pros as well as cons of neodymium magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They maintain their magnetic properties even under strong external field,
  • A magnet with a shiny gold surface has better aesthetics,
  • 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...
  • Due to the potential of flexible shaping and customization to individualized needs, neodymium magnets can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
  • Significant place in modern technologies – they are utilized in HDD drives, brushless drives, precision medical tools, and other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Maximum magnetic pulling force – what it depends on?

Information about lifting capacity was defined for ideal contact conditions, including:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section no less than 10 mm
  • with a surface free of scratches
  • without the slightest clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

During everyday use, the actual holding force depends on a number of factors, listed from the most important:
  • Clearance – the presence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Angle of force application – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel does not close the flux, causing part of the power to be lost into the air.
  • Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Powerful field

Be careful. Neodymium magnets act from a distance and connect with massive power, often faster than you can react.

No play value

NdFeB magnets are not intended for children. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which poses a critical condition and requires immediate surgery.

Eye protection

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Heat warning

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Keep away from electronics

Remember: rare earth magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, device, and GPS.

Health Danger

Individuals with a ICD must maintain an safe separation from magnets. The magnetic field can interfere with the operation of the implant.

Mechanical processing

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Nickel allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease working with magnets and use protective gear.

Finger safety

Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Threat to electronics

Device Safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, medical aids, timepieces).

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