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MP 25x7x9 / N38 - ring magnet

ring magnet

Catalog no 030195

GTIN/EAN: 5906301812128

5.00
Load capacity 14.82 kg / 145.39 N Magnetic Induction 362.13 mT / 3621 Gs
Diameter
25 mm [±0,1 mm]
internal diameter Ø
7 mm [±0,1 mm]
Height
9 mm [±0,1 mm]
Weight
30.54 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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Strength along with structure of neodymium magnets can be analyzed on our magnetic mass calculator.

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Product card - MP 25x7x9 / N38 - ring magnet

Specification / characteristics - MP 25x7x9 / N38 - ring magnet

properties
properties values
Cat. no. 030195
GTIN/EAN 5906301812128
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 7 mm [±0,1 mm]
Height 9 mm [±0,1 mm]
Weight 30.54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.82 kg / 145.39 N
Magnetic Induction ~ ? 362.13 mT / 3621 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x7x9 / 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 product - technical parameters

The following information represent the direct effect of a physical simulation. Results are based on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
MP 25x7x9 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5777 Gs
577.7 mT
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
 crushing
1 mm 5310 Gs
531.0 mT
 12.52 kg / 27.60 lbs
12519.6 g / 122.8 N
 crushing
2 mm 4846 Gs
484.6 mT
 10.43 kg / 22.98 lbs
10425.5 g / 102.3 N
 crushing
3 mm 4397 Gs
439.7 mT
 8.59 kg / 18.93 lbs
8586.1 g / 84.2 N
 medium risk
5 mm 3576 Gs
357.6 mT
 5.68 kg / 12.52 lbs
5678.0 g / 55.7 N
 medium risk
10 mm 2073 Gs
207.3 mT
 1.91 kg / 4.21 lbs
1907.5 g / 18.7 N
 low risk
15 mm 1231 Gs
123.1 mT
 0.67 kg / 1.48 lbs
673.1 g / 6.6 N
 low risk
20 mm 773 Gs
77.3 mT
 0.27 kg / 0.58 lbs
265.0 g / 2.6 N
 low risk
30 mm 356 Gs
35.6 mT
 0.06 kg / 0.12 lbs
56.2 g / 0.6 N
 low risk
50 mm 115 Gs
11.5 mT
 0.01 kg / 0.01 lbs
5.9 g / 0.1 N
 low risk
Grip strength weakens sharply per each millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, varnish, dust) strongly diminishes the holding power. Neodymiums work optimally at the point of direct contact; air break weakens the power. See how flashily the pull force fall, when the product does not touch tightly to the steel surface. When planning the arrangement, avoid additional spacers.

Table 2: Shear capacity (vertical surface)
MP 25x7x9 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.96 kg / 6.53 lbs
2964.0 g / 29.1 N
1 mm Stal (~0.2) 2.50 kg / 5.52 lbs
2504.0 g / 24.6 N
2 mm Stal (~0.2) 2.09 kg / 4.60 lbs
2086.0 g / 20.5 N
3 mm Stal (~0.2) 1.72 kg / 3.79 lbs
1718.0 g / 16.9 N
5 mm Stal (~0.2) 1.14 kg / 2.50 lbs
1136.0 g / 11.1 N
10 mm Stal (~0.2) 0.38 kg / 0.84 lbs
382.0 g / 3.7 N
15 mm Stal (~0.2) 0.13 kg / 0.30 lbs
134.0 g / 1.3 N
20 mm Stal (~0.2) 0.05 kg / 0.12 lbs
54.0 g / 0.5 N
30 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The table below presents the estimated holding capacity sufficient to initiate the slippage of the magnet vertically on a vertical steel wall (assuming typical friction). This parameter depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MP 25x7x9 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
4.45 kg / 9.80 lbs
4446.0 g / 43.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.96 kg / 6.53 lbs
2964.0 g / 29.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.48 kg / 3.27 lbs
1482.0 g / 14.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
7.41 kg / 16.34 lbs
7410.0 g / 72.7 N
When mounting a magnet on a upright plane (e.g., a board), it you can count on just about 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that holders move down easier than they detach. Designing a wall mount? Remember that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slip down under a noticeably lighter cargo. Using a rubber layer can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MP 25x7x9 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.74 kg / 1.63 lbs
741.0 g / 7.3 N
1 mm
13%
 1.85 kg / 4.08 lbs
1852.5 g / 18.2 N
2 mm
25%
 3.71 kg / 8.17 lbs
3705.0 g / 36.3 N
3 mm
38%
 5.56 kg / 12.25 lbs
5557.5 g / 54.5 N
5 mm
63%
 9.26 kg / 20.42 lbs
9262.5 g / 90.9 N
10 mm
100%
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
11 mm
100%
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
12 mm
100%
 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
A too thin steel cannot take in the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a thin surface, the field will pass right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you need a suitably thick element of steel. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MP 25x7x9 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 14.82 kg / 32.67 lbs
14820.0 g / 145.4 N
 OK
40 °C -2.2% 14.49 kg / 31.95 lbs
14494.0 g / 142.2 N
 OK
60 °C -4.4% 14.17 kg / 31.23 lbs
14167.9 g / 139.0 N
 OK
80 °C -6.6% 13.84 kg / 30.52 lbs
13841.9 g / 135.8 N
100 °C -28.8% 10.55 kg / 23.26 lbs
10551.8 g / 103.5 N
Standard neodymium magnets change their properties strength above the temperature limit. Watch out for overheating – heat can permanently destroy this magnet. As the temperature rises, the magnet's force temporarily drops. Refrain from using this magnet close to heaters higher than its operating temperature limit. Ignoring the limit will lead to destruction of magnetism.
*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than long magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 25x7x9 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 74.73 kg / 164.76 lbs
6 082 Gs
11.21 kg / 24.71 lbs
11210 g / 110.0 N
 N/A
1 mm 68.86 kg / 151.81 lbs
11 091 Gs
10.33 kg / 22.77 lbs
10329 g / 101.3 N
 61.97 kg / 136.63 lbs
~0 Gs
2 mm 63.13 kg / 139.18 lbs
10 620 Gs
9.47 kg / 20.88 lbs
9470 g / 92.9 N
 56.82 kg / 125.26 lbs
~0 Gs
3 mm 57.70 kg / 127.20 lbs
10 153 Gs
8.65 kg / 19.08 lbs
8654 g / 84.9 N
 51.93 kg / 114.48 lbs
~0 Gs
5 mm 47.77 kg / 105.31 lbs
9 238 Gs
7.17 kg / 15.80 lbs
7165 g / 70.3 N
 42.99 kg / 94.78 lbs
~0 Gs
10 mm 28.63 kg / 63.12 lbs
7 152 Gs
4.29 kg / 9.47 lbs
4295 g / 42.1 N
 25.77 kg / 56.81 lbs
~0 Gs
20 mm 9.62 kg / 21.21 lbs
4 145 Gs
1.44 kg / 3.18 lbs
1443 g / 14.2 N
 8.66 kg / 19.09 lbs
~0 Gs
50 mm 0.59 kg / 1.29 lbs
1 024 Gs
0.09 kg / 0.19 lbs
88 g / 0.9 N
 0.53 kg / 1.16 lbs
~0 Gs
60 mm 0.28 kg / 0.62 lbs
712 Gs
0.04 kg / 0.09 lbs
43 g / 0.4 N
 0.26 kg / 0.56 lbs
~0 Gs
70 mm 0.15 kg / 0.33 lbs
514 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
80 mm 0.08 kg / 0.18 lbs
383 Gs
0.01 kg / 0.03 lbs
12 g / 0.1 N
 0.07 kg / 0.16 lbs
~0 Gs
90 mm 0.05 kg / 0.11 lbs
293 Gs
0.01 kg / 0.02 lbs
7 g / 0.1 N
 0.04 kg / 0.10 lbs
~0 Gs
100 mm 0.03 kg / 0.07 lbs
230 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and steel combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is massive. The levitation is slightly lower than the connection force, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Attention: Estimates show shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 25x7x9 / 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
Mechanical watch 20 Gs (2.0 mT) 10.5 cm
Phone / Smartphone 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 poses a serious hazard to electronics and pacemakers. These magnets produce a field that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field penetrates the body and housings. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MP 25x7x9 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.44 km/h
(6.51 m/s)
 0.65 J
30 mm 25.05 km/h
(6.96 m/s)
 0.74 J
50 mm 25.12 km/h
(6.98 m/s)
 0.74 J
100 mm 25.13 km/h
(6.98 m/s)
 0.74 J
Magnetic elements are delicate – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 25x7x9 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MP 25x7x9 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 495 Mx 225.0 µWb
Pc Coefficient 1.05 High (Stable)
Flux value passing through the pole surface. Key data in coil applications and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MP 25x7x9 / N38

Environment Effective steel pull Effect
Air (land) 14.82 kg Standard
Water (riverbed) 16.97 kg
(+2.15 kg buoyancy gain)
+14.5%
Rust risk: 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. However, remember the water resistance when pulling the rope quickly.

1. Shear force

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

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.

3. Temperature resistance

*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) = 1.05

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%

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: 030195-2026
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The ring magnet with a hole MP 25x7x9 / 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 14.82 kg works great as a door latch, speaker holder, or mounting element in devices.
This is a crucial issue when working with model MP 25x7x9 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. 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.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. 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.
A screw or bolt with a thread diameter smaller than 7 mm fits this model. 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. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 9 mm. The pulling force of this model is an impressive 14.82 kg, which translates to 145.39 N in newtons. The mounting hole diameter is precisely 7 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). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of Nd2Fe14B magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They retain full power for nearly ten years – the loss is just ~1% (according to analyses),
  • Magnets effectively defend themselves against loss of magnetization caused by external fields,
  • In other words, due to the glossy layer of gold, the element gains a professional look,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
  • Thanks to flexibility in constructing and the ability to adapt to individual projects,
  • Universal use in innovative solutions – they are utilized in magnetic memories, electromotive mechanisms, medical equipment, also complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: application proposals
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves 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 - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small components of these products can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The specified lifting capacity represents the peak performance, measured under ideal test conditions, specifically:
  • with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • without the slightest insulating layer between the magnet and steel
  • during detachment in a direction vertical to the plane
  • in neutral thermal conditions

What influences lifting capacity in practice

It is worth knowing that the working load may be lower influenced by the following factors, starting with the most relevant:
  • Gap (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be wasted to the other side.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content reduce magnetic properties and holding force.
  • Base smoothness – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Fire warning

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Thermal limits

Avoid heat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Metal Allergy

Some people suffer from a contact allergy to nickel, which is the common plating for NdFeB magnets. Prolonged contact might lead to a rash. We suggest wear safety gloves.

Threat to electronics

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Phone sensors

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, device, and GPS.

Safe operation

Handle magnets consciously. Their huge power can surprise even professionals. Be vigilant and respect their power.

Fragile material

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Pinching danger

Big blocks can crush fingers in a fraction of a second. Under no circumstances put your hand between two strong magnets.

Adults only

Product intended for adults. Small elements can be swallowed, leading to serious injuries. Store away from children and animals.

Pacemakers

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Warning! Looking for details? Read our article: Are neodymium magnets dangerous?