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MP 25x5x27 / N38 - ring magnet

ring magnet

Catalog no 030192

GTIN/EAN: 5906301812098

5.00

Diameter

25 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

Height

27 mm [±0,1 mm]

Weight

95.43 g

Magnetization Direction

↑ axial

Load capacity

18.51 kg / 181.54 N

Magnetic Induction

562.34 mT / 5623 Gs

Coating

[NiCuNi] Nickel

technical parameters »

47.18 ZŁ with VAT / pcs + price for transport

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Technical - MP 25x5x27 / N38 - ring magnet

Specification / characteristics - MP 25x5x27 / N38 - ring magnet

properties
properties values
Cat. no. 030192
GTIN/EAN 5906301812098
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 5 mm [±0,1 mm]
Height 27 mm [±0,1 mm]
Weight 95.43 g
Magnetization Direction ↑ axial
Load capacity ~ ? 18.51 kg / 181.54 N
Magnetic Induction ~ ? 562.34 mT / 5623 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x5x27 / 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

Physical analysis of the assembly - report

The following values represent the outcome of a engineering simulation. Results rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Use these calculations as a reference point during assembly planning.

Table 1: Static force (force vs gap) - power drop
MP 25x5x27 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5716 Gs
571.6 mT
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
 crushing
1 mm 5288 Gs
528.8 mT
 15.84 kg / 34.92 lbs
15839.8 g / 155.4 N
 crushing
2 mm 4861 Gs
486.1 mT
 13.38 kg / 29.51 lbs
13384.0 g / 131.3 N
 crushing
3 mm 4446 Gs
444.6 mT
 11.20 kg / 24.69 lbs
11198.0 g / 109.9 N
 crushing
5 mm 3677 Gs
367.7 mT
 7.66 kg / 16.88 lbs
7657.5 g / 75.1 N
 medium risk
10 mm 2216 Gs
221.6 mT
 2.78 kg / 6.13 lbs
2782.1 g / 27.3 N
 medium risk
15 mm 1354 Gs
135.4 mT
 1.04 kg / 2.29 lbs
1037.8 g / 10.2 N
 safe
20 mm 864 Gs
86.4 mT
 0.42 kg / 0.93 lbs
423.3 g / 4.2 N
 safe
30 mm 405 Gs
40.5 mT
 0.09 kg / 0.21 lbs
93.1 g / 0.9 N
 safe
50 mm 133 Gs
13.3 mT
 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
 safe
Magnetic force decreases significantly with every mm of spacing. Remember that even the smallest gap (e.g., dirt, varnish, dust) significantly diminishes the holding power. Neodymiums hold strongest in perfect adhesion; air break drastically cuts the force. See how rapidly the load capacity fall, when the product does not adhere directly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Shear force (wall)
MP 25x5x27 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.70 kg / 8.16 lbs
3702.0 g / 36.3 N
1 mm Stal (~0.2) 3.17 kg / 6.98 lbs
3168.0 g / 31.1 N
2 mm Stal (~0.2) 2.68 kg / 5.90 lbs
2676.0 g / 26.3 N
3 mm Stal (~0.2) 2.24 kg / 4.94 lbs
2240.0 g / 22.0 N
5 mm Stal (~0.2) 1.53 kg / 3.38 lbs
1532.0 g / 15.0 N
10 mm Stal (~0.2) 0.56 kg / 1.23 lbs
556.0 g / 5.5 N
15 mm Stal (~0.2) 0.21 kg / 0.46 lbs
208.0 g / 2.0 N
20 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The following data calculates the estimated force sufficient to cause the downward movement of the magnet down along a vertical steel wall (considering standard friction). This parameter is a function of the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MP 25x5x27 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.55 kg / 12.24 lbs
5553.0 g / 54.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.70 kg / 8.16 lbs
3702.0 g / 36.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.85 kg / 4.08 lbs
1851.0 g / 18.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.26 kg / 20.40 lbs
9255.0 g / 90.8 N
When mounting a holder on a vertical plane (e.g., a car body), it will only hold only approx. 1/5 of its maximum pull force. Gravity as well as a weak degree of grip influence the fact that products move down faster than they detach. Designing a hanger? Remember that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a significantly smaller weight. Utilizing a rubberized coating can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MP 25x5x27 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.93 kg / 2.04 lbs
925.5 g / 9.1 N
1 mm
13%
 2.31 kg / 5.10 lbs
2313.8 g / 22.7 N
2 mm
25%
 4.63 kg / 10.20 lbs
4627.5 g / 45.4 N
3 mm
38%
 6.94 kg / 15.30 lbs
6941.3 g / 68.1 N
5 mm
63%
 11.57 kg / 25.50 lbs
11568.8 g / 113.5 N
10 mm
100%
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
11 mm
100%
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
12 mm
100%
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
A too thin steel is unable to focus the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you need a suitably thick piece of metal. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the product holds weaker. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal stability (stability) - power drop
MP 25x5x27 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
 OK
40 °C -2.2% 18.10 kg / 39.91 lbs
18102.8 g / 177.6 N
 OK
60 °C -4.4% 17.70 kg / 39.01 lbs
17695.6 g / 173.6 N
 OK
80 °C -6.6% 17.29 kg / 38.11 lbs
17288.3 g / 169.6 N
100 °C -28.8% 13.18 kg / 29.05 lbs
13179.1 g / 129.3 N
Classic neodymiums change their properties parameters after exceeding the maximum temperature. Avoid high temperatures – excessive heat can irreversibly demagnetize this magnet. With increasing heat, the neodymium's power temporarily drops. Avoid using this magnet close to heaters exceeding its working range. Ignoring the limit will result in permanent loss of magnetism.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 25x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.99 kg / 30.83 lbs
6 064 Gs
2.10 kg / 4.62 lbs
2098 g / 20.6 N
 N/A
1 mm 12.97 kg / 28.59 lbs
11 008 Gs
1.94 kg / 4.29 lbs
1945 g / 19.1 N
 11.67 kg / 25.73 lbs
~0 Gs
2 mm 11.97 kg / 26.39 lbs
10 576 Gs
1.80 kg / 3.96 lbs
1795 g / 17.6 N
 10.77 kg / 23.75 lbs
~0 Gs
3 mm 11.02 kg / 24.29 lbs
10 146 Gs
1.65 kg / 3.64 lbs
1652 g / 16.2 N
 9.91 kg / 21.86 lbs
~0 Gs
5 mm 9.26 kg / 20.42 lbs
9 303 Gs
1.39 kg / 3.06 lbs
1389 g / 13.6 N
 8.33 kg / 18.37 lbs
~0 Gs
10 mm 5.79 kg / 12.76 lbs
7 353 Gs
0.87 kg / 1.91 lbs
868 g / 8.5 N
 5.21 kg / 11.48 lbs
~0 Gs
20 mm 2.10 kg / 4.63 lbs
4 432 Gs
0.32 kg / 0.70 lbs
315 g / 3.1 N
 1.89 kg / 4.17 lbs
~0 Gs
50 mm 0.14 kg / 0.32 lbs
1 159 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
60 mm 0.07 kg / 0.16 lbs
811 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.06 kg / 0.14 lbs
~0 Gs
70 mm 0.04 kg / 0.08 lbs
589 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
80 mm 0.02 kg / 0.05 lbs
440 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.03 lbs
338 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
265 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums interact from a wider radius than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a wider radius of action. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Remember that when attracting two neodymiums, the impact force is huge. The repulsion force is slightly lower than the connection force, but still large.
*Field value between like poles is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Figures demonstrate shear force of dual same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - warnings
MP 25x5x27 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 18.0 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Timepiece 20 Gs (2.0 mT) 11.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.5 cm
Remote 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Powerful magnet radiation poses a serious hazard to electronics as well as pacemakers. These magnets generate a field that disrupts operation of digital equipment. Remember: the unseen radiation penetrates the body and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MP 25x5x27 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.31 km/h
(4.25 m/s)
 0.86 J
30 mm 24.40 km/h
(6.78 m/s)
 2.19 J
50 mm 31.42 km/h
(8.73 m/s)
 3.63 J
100 mm 44.42 km/h
(12.34 m/s)
 7.26 J
Neodymium magnets are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
MP 25x5x27 / 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 (Flux)
MP 25x5x27 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 917 Mx 49.2 µWb
Pc Coefficient 1.40 High (Stable)
Total magnetic flux passing through the pole surface. Key data in coil applications and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 25x5x27 / N38

Environment Effective steel pull Effect
Air (land) 18.51 kg Standard
Water (riverbed) 21.19 kg
(+2.68 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.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Warning: On a vertical surface, the magnet holds merely a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Power loss vs temp

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.40

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
Chemical composition
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: 030192-2026
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The ring magnet with a hole MP 25x5x27 / 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. 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 25x5x27 / 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. 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. This product is dedicated for inside building use. For outdoor applications, we recommend choosing magnets in hermetic housing 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 Ø25x27 mm and a weight of 95.43 g. The pulling force of this model is an impressive 18.51 kg, which translates to 181.54 N in newtons. The mounting hole diameter is precisely 5 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.

Pros and cons of Nd2Fe14B magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by external disturbances,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets are characterized by excellent magnetic induction on the outer layer,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of exact modeling and adapting to specific requirements,
  • Wide application in innovative solutions – they are utilized in data components, electric drive systems, advanced medical instruments, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Pull force analysis

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

Information about lifting capacity was determined for ideal contact conditions, assuming:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • with a thickness of at least 10 mm
  • characterized by smoothness
  • with total lack of distance (without paint)
  • under axial application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

In practice, the actual lifting capacity results from many variables, presented from most significant:
  • Distance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Allergy Warning

Some people experience a contact allergy to Ni, which is the standard coating for neodymium magnets. Frequent touching can result in a rash. We strongly advise use safety gloves.

Heat sensitivity

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

Bone fractures

Danger of trauma: The attraction force is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

GPS Danger

Note: rare earth magnets produce a field that interferes with precision electronics. Keep a separation from your mobile, device, and navigation systems.

Product not for children

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Store away from children and animals.

Material brittleness

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Medical implants

Individuals with a pacemaker must maintain an absolute distance from magnets. The magnetism can disrupt the functioning of the implant.

Electronic hazard

Avoid bringing magnets close to a purse, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Mechanical processing

Fire hazard: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Immense force

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Attention! Learn more about hazards in the article: Magnet Safety Guide.