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MP 41x15x10 / N38 - ring magnet

ring magnet

Catalog no 030200

GTIN/EAN: 5906301812173

5.00

Diameter

41 mm [±0,1 mm]

internal diameter Ø

15 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

85.77 g

Magnetization Direction

↑ axial

Load capacity

24.44 kg / 239.78 N

Magnetic Induction

271.77 mT / 2718 Gs

Coating

[NiCuNi] Nickel

50.00 with VAT / pcs + price for transport

40.65 ZŁ net + 23% VAT / pcs

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Physical properties - MP 41x15x10 / N38 - ring magnet

Specification / characteristics - MP 41x15x10 / N38 - ring magnet

properties
properties values
Cat. no. 030200
GTIN/EAN 5906301812173
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 41 mm [±0,1 mm]
internal diameter Ø 15 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 85.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 24.44 kg / 239.78 N
Magnetic Induction ~ ? 271.77 mT / 2718 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 41x15x10 / 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 analysis of the product - technical parameters

The following information represent the direct effect of a physical calculation. Values were calculated on models for the class Nd2Fe14B. Actual parameters may differ. Please consider these data as a reference point when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MP 41x15x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5232 Gs
523.2 mT
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
dangerous!
1 mm 4978 Gs
497.8 mT
22.12 kg / 48.77 LBS
22120.4 g / 217.0 N
dangerous!
2 mm 4720 Gs
472.0 mT
19.89 kg / 43.85 LBS
19888.8 g / 195.1 N
dangerous!
3 mm 4464 Gs
446.4 mT
17.79 kg / 39.22 LBS
17788.4 g / 174.5 N
dangerous!
5 mm 3964 Gs
396.4 mT
14.03 kg / 30.93 LBS
14030.8 g / 137.6 N
dangerous!
10 mm 2861 Gs
286.1 mT
7.31 kg / 16.11 LBS
7308.1 g / 71.7 N
warning
15 mm 2028 Gs
202.8 mT
3.67 kg / 8.09 LBS
3670.1 g / 36.0 N
warning
20 mm 1443 Gs
144.3 mT
1.86 kg / 4.10 LBS
1858.4 g / 18.2 N
weak grip
30 mm 770 Gs
77.0 mT
0.53 kg / 1.17 LBS
529.8 g / 5.2 N
weak grip
50 mm 280 Gs
28.0 mT
0.07 kg / 0.15 LBS
69.8 g / 0.7 N
weak grip

Table 2: Shear load (wall)
MP 41x15x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
1 mm Stal (~0.2) 4.42 kg / 9.75 LBS
4424.0 g / 43.4 N
2 mm Stal (~0.2) 3.98 kg / 8.77 LBS
3978.0 g / 39.0 N
3 mm Stal (~0.2) 3.56 kg / 7.84 LBS
3558.0 g / 34.9 N
5 mm Stal (~0.2) 2.81 kg / 6.19 LBS
2806.0 g / 27.5 N
10 mm Stal (~0.2) 1.46 kg / 3.22 LBS
1462.0 g / 14.3 N
15 mm Stal (~0.2) 0.73 kg / 1.62 LBS
734.0 g / 7.2 N
20 mm Stal (~0.2) 0.37 kg / 0.82 LBS
372.0 g / 3.6 N
30 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
50 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N

Table 3: Vertical assembly (shearing) - vertical pull
MP 41x15x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.33 kg / 16.16 LBS
7332.0 g / 71.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.89 kg / 10.78 LBS
4888.0 g / 48.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.44 kg / 5.39 LBS
2444.0 g / 24.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
12.22 kg / 26.94 LBS
12220.0 g / 119.9 N

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 41x15x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.22 kg / 2.69 LBS
1222.0 g / 12.0 N
1 mm
13%
3.06 kg / 6.74 LBS
3055.0 g / 30.0 N
2 mm
25%
6.11 kg / 13.47 LBS
6110.0 g / 59.9 N
3 mm
38%
9.17 kg / 20.21 LBS
9165.0 g / 89.9 N
5 mm
63%
15.28 kg / 33.68 LBS
15275.0 g / 149.8 N
10 mm
100%
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
11 mm
100%
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
12 mm
100%
24.44 kg / 53.88 LBS
24440.0 g / 239.8 N

Table 5: Thermal resistance (material behavior) - resistance threshold
MP 41x15x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 24.44 kg / 53.88 LBS
24440.0 g / 239.8 N
OK
40 °C -2.2% 23.90 kg / 52.70 LBS
23902.3 g / 234.5 N
OK
60 °C -4.4% 23.36 kg / 51.51 LBS
23364.6 g / 229.2 N
OK
80 °C -6.6% 22.83 kg / 50.32 LBS
22827.0 g / 223.9 N
100 °C -28.8% 17.40 kg / 38.36 LBS
17401.3 g / 170.7 N

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 41x15x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 178.13 kg / 392.71 LBS
5 907 Gs
26.72 kg / 58.91 LBS
26719 g / 262.1 N
N/A
1 mm 169.67 kg / 374.06 LBS
10 213 Gs
25.45 kg / 56.11 LBS
25451 g / 249.7 N
152.70 kg / 336.65 LBS
~0 Gs
2 mm 161.22 kg / 355.43 LBS
9 955 Gs
24.18 kg / 53.32 LBS
24183 g / 237.2 N
145.10 kg / 319.89 LBS
~0 Gs
3 mm 152.98 kg / 337.26 LBS
9 697 Gs
22.95 kg / 50.59 LBS
22947 g / 225.1 N
137.68 kg / 303.53 LBS
~0 Gs
5 mm 137.18 kg / 302.42 LBS
9 183 Gs
20.58 kg / 45.36 LBS
20577 g / 201.9 N
123.46 kg / 272.18 LBS
~0 Gs
10 mm 102.26 kg / 225.45 LBS
7 929 Gs
15.34 kg / 33.82 LBS
15339 g / 150.5 N
92.04 kg / 202.90 LBS
~0 Gs
20 mm 53.26 kg / 117.43 LBS
5 722 Gs
7.99 kg / 17.61 LBS
7990 g / 78.4 N
47.94 kg / 105.69 LBS
~0 Gs
50 mm 7.08 kg / 15.62 LBS
2 087 Gs
1.06 kg / 2.34 LBS
1063 g / 10.4 N
6.38 kg / 14.06 LBS
~0 Gs
60 mm 3.86 kg / 8.51 LBS
1 541 Gs
0.58 kg / 1.28 LBS
579 g / 5.7 N
3.48 kg / 7.66 LBS
~0 Gs
70 mm 2.20 kg / 4.84 LBS
1 162 Gs
0.33 kg / 0.73 LBS
330 g / 3.2 N
1.98 kg / 4.36 LBS
~0 Gs
80 mm 1.30 kg / 2.87 LBS
895 Gs
0.20 kg / 0.43 LBS
195 g / 1.9 N
1.17 kg / 2.58 LBS
~0 Gs
90 mm 0.80 kg / 1.76 LBS
701 Gs
0.12 kg / 0.26 LBS
120 g / 1.2 N
0.72 kg / 1.59 LBS
~0 Gs
100 mm 0.51 kg / 1.12 LBS
559 Gs
0.08 kg / 0.17 LBS
76 g / 0.7 N
0.46 kg / 1.01 LBS
~0 Gs

Table 7: Protective zones (implants) - precautionary measures
MP 41x15x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 19.0 cm
Timepiece 20 Gs (2.0 mT) 15.0 cm
Mobile device 40 Gs (4.0 mT) 11.5 cm
Car key 50 Gs (5.0 mT) 10.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm

Table 8: Collisions (kinetic energy) - warning
MP 41x15x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.95 km/h
(5.54 m/s)
1.32 J
30 mm 29.88 km/h
(8.30 m/s)
2.96 J
50 mm 38.13 km/h
(10.59 m/s)
4.81 J
100 mm 53.84 km/h
(14.96 m/s)
9.59 J

Table 9: Surface protection spec
MP 41x15x10 / 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)

Table 10: Electrical data (Flux)
MP 41x15x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 56 505 Mx 565.0 µWb
Pc Coefficient 0.80 High (Stable)

Table 11: Physics of underwater searching
MP 41x15x10 / N38

Environment Effective steel pull Effect
Air (land) 24.44 kg Standard
Water (riverbed) 27.98 kg
(+3.54 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

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

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.80

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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
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%
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: 030200-2026
Quick Unit Converter
Force (pull)

Field Strength

Other deals

The ring magnet with a hole MP 41x15x10 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. 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 41x15x10 / 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 excessive force will cause the ring to crack. 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 indoor 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. Always check that the screw head is not larger than the outer diameter of the magnet (41 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 41 mm and thickness 10 mm. The pulling force of this model is an impressive 24.44 kg, which translates to 239.78 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 15 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. In the case of connecting two rings, make sure one is turned the right way. When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Strengths and weaknesses of neodymium magnets.

Advantages

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They do not lose strength, even over approximately ten years – the drop in strength is only ~1% (according to tests),
  • Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
  • By covering with a smooth layer of gold, the element presents an modern look,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • In view of the possibility of accurate shaping and customization to custom solutions, NdFeB magnets can be created in a variety of forms and dimensions, which amplifies use scope,
  • Fundamental importance in modern industrial fields – they serve a role in data components, electromotive mechanisms, medical devices, also complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

What to avoid - cons of neodymium magnets and proposals for their use:
  • They are prone to damage 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
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:
  • with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth contact surface
  • with zero gap (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

Please note that the working load may be lower influenced by the following factors, starting with the most relevant:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, 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 testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Material brittleness

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Do not drill into magnets

Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Hand protection

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

Data carriers

Avoid bringing magnets near a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Do not underestimate power

Handle magnets with awareness. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.

Magnetic interference

A strong magnetic field negatively affects the operation of compasses in phones and GPS navigation. Do not bring magnets near a device to prevent damaging the sensors.

Operating temperature

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Sensitization to coating

Studies show that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from direct skin contact or opt for coated magnets.

Adults only

Neodymium magnets are not toys. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Medical implants

Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Warning! Need more info? Read our article: Why are neodymium magnets dangerous?