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MP 40x10.4/5.5x5 / N38 - ring magnet

ring magnet

Catalog no 030249

GTIN/EAN: 5906301812258

5.00

Diameter

40 mm [±0,1 mm]

internal diameter Ø

10.4/5.5 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

46.23 g

Magnetization Direction

↑ axial

Load capacity

9.47 kg / 92.86 N

Magnetic Induction

150.36 mT / 1504 Gs

Coating

[NiCuNi] Nickel

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Technical parameters - MP 40x10.4/5.5x5 / N38 - ring magnet

Specification / characteristics - MP 40x10.4/5.5x5 / N38 - ring magnet

properties
properties values
Cat. no. 030249
GTIN/EAN 5906301812258
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 40 mm [±0,1 mm]
internal diameter Ø 10.4/5.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 46.23 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.47 kg / 92.86 N
Magnetic Induction ~ ? 150.36 mT / 1504 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 40x10.4/5.5x5 / 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 simulation of the assembly - technical parameters

These values represent the direct effect of a physical calculation. Values are based on models for the class Nd2Fe14B. Actual parameters may differ. Treat these calculations as a reference point for designers.

Table 1: Static force (pull vs distance) - characteristics
MP 40x10.4/5.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1289 Gs
128.9 mT
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
 warning
1 mm 1265 Gs
126.5 mT
 9.12 kg / 20.11 LBS
9120.9 g / 89.5 N
 warning
2 mm 1232 Gs
123.2 mT
 8.66 kg / 19.10 LBS
8662.7 g / 85.0 N
 warning
3 mm 1193 Gs
119.3 mT
 8.12 kg / 17.90 LBS
8121.3 g / 79.7 N
 warning
5 mm 1099 Gs
109.9 mT
 6.89 kg / 15.18 LBS
6887.8 g / 67.6 N
 warning
10 mm 825 Gs
82.5 mT
 3.88 kg / 8.56 LBS
3882.0 g / 38.1 N
 warning
15 mm 580 Gs
58.0 mT
 1.92 kg / 4.22 LBS
1915.5 g / 18.8 N
 low risk
20 mm 399 Gs
39.9 mT
 0.91 kg / 2.00 LBS
908.3 g / 8.9 N
 low risk
30 mm 195 Gs
19.5 mT
 0.22 kg / 0.48 LBS
217.6 g / 2.1 N
 low risk
50 mm 61 Gs
6.1 mT
 0.02 kg / 0.05 LBS
21.0 g / 0.2 N
 low risk
Grip strength drops drastically with every subsequent millimeter of gap. Remember that even a very thin break (e.g., contamination, varnish, dust) strongly reduces the pull force. Magnets work strongest at the point of direct contact; air break kills the force. Analyze how rapidly the load capacity drop, when the magnet does not adhere flatly to the steel surface. When planning the assembly, discard redundant distances.

Table 2: Vertical capacity (wall)
MP 40x10.4/5.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.89 kg / 4.18 LBS
1894.0 g / 18.6 N
1 mm Stal (~0.2) 1.82 kg / 4.02 LBS
1824.0 g / 17.9 N
2 mm Stal (~0.2) 1.73 kg / 3.82 LBS
1732.0 g / 17.0 N
3 mm Stal (~0.2) 1.62 kg / 3.58 LBS
1624.0 g / 15.9 N
5 mm Stal (~0.2) 1.38 kg / 3.04 LBS
1378.0 g / 13.5 N
10 mm Stal (~0.2) 0.78 kg / 1.71 LBS
776.0 g / 7.6 N
15 mm Stal (~0.2) 0.38 kg / 0.85 LBS
384.0 g / 3.8 N
20 mm Stal (~0.2) 0.18 kg / 0.40 LBS
182.0 g / 1.8 N
30 mm Stal (~0.2) 0.04 kg / 0.10 LBS
44.0 g / 0.4 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The table below indicates the approximate holding capacity necessary to start the sliding of the magnet downwards on a vertical metal surface (assuming standard friction). The holding force is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MP 40x10.4/5.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.84 kg / 6.26 LBS
2841.0 g / 27.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.89 kg / 4.18 LBS
1894.0 g / 18.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.95 kg / 2.09 LBS
947.0 g / 9.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.74 kg / 10.44 LBS
4735.0 g / 46.5 N
When mounting a magnet on a upright wall (e.g., a car body), it you can count on only approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip cause that products slide down faster than they pop off the substrate. Want to create a hanger? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a significantly smaller load. Utilizing a rubberized layer can significantly improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MP 40x10.4/5.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.95 kg / 2.09 LBS
947.0 g / 9.3 N
1 mm
25%
 2.37 kg / 5.22 LBS
2367.5 g / 23.2 N
2 mm
50%
 4.74 kg / 10.44 LBS
4735.0 g / 46.5 N
3 mm
75%
 7.10 kg / 15.66 LBS
7102.5 g / 69.7 N
5 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
10 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
11 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
12 mm
100%
 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
A thin sheet is not enough to focus the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you need a suitably thick piece of steel. The saturation effect causes that on thin elements (e.g., car bodies), the magnet works worse. We advise picking the steel dimension from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MP 40x10.4/5.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.47 kg / 20.88 LBS
9470.0 g / 92.9 N
 OK
40 °C -2.2% 9.26 kg / 20.42 LBS
9261.7 g / 90.9 N
 OK
60 °C -4.4% 9.05 kg / 19.96 LBS
9053.3 g / 88.8 N
80 °C -6.6% 8.84 kg / 19.50 LBS
8845.0 g / 86.8 N
100 °C -28.8% 6.74 kg / 14.86 LBS
6742.6 g / 66.1 N
Standard neodymium magnets change their properties power above the temperature limit. Protect against heat – excessive heat can permanently damage this product. With increasing heat, the magnet's capacity temporarily drops. Avoid using this product close to heaters higher than its working range. Exceeding the critical threshold will cause destruction of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 40x10.4/5.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 10.73 kg / 23.65 LBS
2 424 Gs
1.61 kg / 3.55 LBS
1609 g / 15.8 N
 N/A
1 mm 10.55 kg / 23.25 LBS
2 555 Gs
1.58 kg / 3.49 LBS
1582 g / 15.5 N
 9.49 kg / 20.93 LBS
~0 Gs
2 mm 10.33 kg / 22.78 LBS
2 529 Gs
1.55 kg / 3.42 LBS
1550 g / 15.2 N
 9.30 kg / 20.50 LBS
~0 Gs
3 mm 10.09 kg / 22.23 LBS
2 499 Gs
1.51 kg / 3.34 LBS
1513 g / 14.8 N
 9.08 kg / 20.01 LBS
~0 Gs
5 mm 9.52 kg / 20.98 LBS
2 427 Gs
1.43 kg / 3.15 LBS
1427 g / 14.0 N
 8.56 kg / 18.88 LBS
~0 Gs
10 mm 7.80 kg / 17.20 LBS
2 198 Gs
1.17 kg / 2.58 LBS
1170 g / 11.5 N
 7.02 kg / 15.48 LBS
~0 Gs
20 mm 4.40 kg / 9.69 LBS
1 650 Gs
0.66 kg / 1.45 LBS
660 g / 6.5 N
 3.96 kg / 8.72 LBS
~0 Gs
50 mm 0.49 kg / 1.09 LBS
553 Gs
0.07 kg / 0.16 LBS
74 g / 0.7 N
 0.44 kg / 0.98 LBS
~0 Gs
60 mm 0.25 kg / 0.54 LBS
391 Gs
0.04 kg / 0.08 LBS
37 g / 0.4 N
 0.22 kg / 0.49 LBS
~0 Gs
70 mm 0.13 kg / 0.28 LBS
282 Gs
0.02 kg / 0.04 LBS
19 g / 0.2 N
 0.12 kg / 0.26 LBS
~0 Gs
80 mm 0.07 kg / 0.15 LBS
209 Gs
0.01 kg / 0.02 LBS
11 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
90 mm 0.04 kg / 0.09 LBS
158 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.04 kg / 0.08 LBS
~0 Gs
100 mm 0.02 kg / 0.05 LBS
121 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
Two magnetic products attract each other from a much further distance than a magnet and sheet setup. Such a system of two magnets generates a stronger field and a further horizon of performance. Designing a strong closure? Use a pair of magnets instead of one magnet and a steel. Remember that when bringing together two magnets, the collision energy is massive. The levitation is marginally weaker than the attraction, but still significant.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Important: Results demonstrate shear force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
MP 40x10.4/5.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 10.0 cm
Timepiece 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Car key 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field poses a serious hazard to electronics as well as pacemakers. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation penetrates the body and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MP 40x10.4/5.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.75 km/h
(4.93 m/s)
 0.56 J
30 mm 25.36 km/h
(7.04 m/s)
 1.15 J
50 mm 32.32 km/h
(8.98 m/s)
 1.86 J
100 mm 45.65 km/h
(12.68 m/s)
 3.72 J
Magnetic elements are delicate – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to fingers. Hold the magnet firmly during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
MP 40x10.4/5.5x5 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MP 40x10.4/5.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 767 Mx 177.7 µWb
Pc Coefficient 0.17 Low (Flat)
Total magnetic flux passing through the magnet pole. Essential parameter when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MP 40x10.4/5.5x5 / N38

Environment Effective steel pull Effect
Air (land) 9.47 kg Standard
Water (riverbed) 10.84 kg
(+1.37 kg buoyancy gain)
+14.5%
Corrosion warning: 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. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Note: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Steel saturation

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.17

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%
Ecology and recycling (GPSR)
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: 030249-2026
Quick Unit Converter
Magnet pull force
Magnetic Induction
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The ring-shaped magnet MP 40x10.4/5.5x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 9.47 kg works great as a door latch, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 40x10.4/5.5x5 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. It's a good idea to use a rubber spacer 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 does not ensure full waterproofing. 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. 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. Always check that the screw head is not larger than the outer diameter of the magnet (40 mm), so it doesn't protrude beyond the outline.
The presented product is a ring magnet with dimensions Ø40 mm (outer diameter) and height 5 mm. The key parameter here is the lifting capacity amounting to approximately 9.47 kg (force ~92.86 N). The mounting hole diameter is precisely 10.4/5.5 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 rare earth magnets.

Strengths

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • Their power is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • They retain their magnetic properties even under close interference source,
  • Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
  • Magnets exhibit impressive magnetic induction on the outer layer,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of detailed creating and modifying to defined requirements,
  • Fundamental importance in modern technologies – they serve a role in HDD drives, electric motors, medical equipment, and modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in creating threads and complex forms in magnets, we recommend using cover - magnetic mount.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • 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 affects it?

Breakaway force is the result of a measurement for optimal configuration, including:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • with a surface cleaned and smooth
  • under conditions of no distance (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Air gap (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to varnish, rust or debris).
  • Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Conscious usage

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

Safe distance

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Medical interference

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

Bodily injuries

Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Thermal limits

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Magnet fragility

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Skin irritation risks

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, avoid direct skin contact and choose encased magnets.

No play value

These products are not toys. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which poses a severe health hazard and requires immediate surgery.

Magnetic interference

Note: rare earth magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, tablet, and navigation systems.

Combustion hazard

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Danger! Want to know more? Check our post: Why are neodymium magnets dangerous?