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MP 20x10x5 / N38 - ring magnet

ring magnet

Catalog no 030184

GTIN/EAN: 5906301812012

5.00
Load capacity 5.20 kg / 50.97 N Magnetic Induction 277.16 mT / 2772 Gs
Diameter
20 mm [±0,1 mm]
internal diameter Ø
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
8.84 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 - MP 20x10x5 / N38 - ring magnet

Specification / characteristics - MP 20x10x5 / N38 - ring magnet

properties
properties values
Cat. no. 030184
GTIN/EAN 5906301812012
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 20 mm [±0,1 mm]
internal diameter Ø 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 8.84 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.20 kg / 50.97 N
Magnetic Induction ~ ? 277.16 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x10x5 / 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 analysis of the assembly - technical parameters

These information constitute the direct effect of a engineering analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - power drop
MP 20x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5917 Gs
591.7 mT
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
 warning
1 mm 5321 Gs
532.1 mT
 4.21 kg / 9.27 pounds
4205.9 g / 41.3 N
 warning
2 mm 4736 Gs
473.6 mT
 3.33 kg / 7.35 pounds
3332.2 g / 32.7 N
 warning
3 mm 4184 Gs
418.4 mT
 2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
 warning
5 mm 3216 Gs
321.6 mT
 1.54 kg / 3.39 pounds
1536.2 g / 15.1 N
 safe
10 mm 1650 Gs
165.0 mT
 0.40 kg / 0.89 pounds
404.2 g / 4.0 N
 safe
15 mm 907 Gs
90.7 mT
 0.12 kg / 0.27 pounds
122.3 g / 1.2 N
 safe
20 mm 544 Gs
54.4 mT
 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
 safe
30 mm 240 Gs
24.0 mT
 0.01 kg / 0.02 pounds
8.5 g / 0.1 N
 safe
50 mm 75 Gs
7.5 mT
 0.00 kg / 0.00 pounds
0.8 g / 0.0 N
 safe
Pulling power weakens significantly with every mm of gap. Keep in mind that even a microscopic distance (e.g., dirt, varnish, dust) significantly reduces the pull force. Neodymiums work strongest in perfect adhesion; gap nullifies the power. Observe how quickly the parameters drop, when the product does not touch tightly to the metal substrate. When designing the assembly, avoid additional spacers.

Table 2: Vertical force (vertical surface)
MP 20x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.04 kg / 2.29 pounds
1040.0 g / 10.2 N
1 mm Stal (~0.2) 0.84 kg / 1.86 pounds
842.0 g / 8.3 N
2 mm Stal (~0.2) 0.67 kg / 1.47 pounds
666.0 g / 6.5 N
3 mm Stal (~0.2) 0.52 kg / 1.15 pounds
520.0 g / 5.1 N
5 mm Stal (~0.2) 0.31 kg / 0.68 pounds
308.0 g / 3.0 N
10 mm Stal (~0.2) 0.08 kg / 0.18 pounds
80.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data defines the approximate weight limit required to initiate the shifting of the magnet down along a vertical steel plate (assuming typical friction coefficient). This value depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MP 20x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.56 kg / 3.44 pounds
1560.0 g / 15.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.04 kg / 2.29 pounds
1040.0 g / 10.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.52 kg / 1.15 pounds
520.0 g / 5.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
When hanging a element on a upright wall (e.g., a fridge), it you can count on just about 1/5 of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that holders slip easier than they pull off. Want to create a wall mount? Remember that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller weight. Utilizing a rubberized pad can significantly raise the stability.

Table 4: Material efficiency (saturation) - power losses
MP 20x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.52 kg / 1.15 pounds
520.0 g / 5.1 N
1 mm
25%
 1.30 kg / 2.87 pounds
1300.0 g / 12.8 N
2 mm
50%
 2.60 kg / 5.73 pounds
2600.0 g / 25.5 N
3 mm
75%
 3.90 kg / 8.60 pounds
3900.0 g / 38.3 N
5 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
10 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
11 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
12 mm
100%
 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
A too thin steel cannot take in 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 achieve full efficiency of this magnet's potential, you require a sufficiently solid element of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the holder works worse. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal stability (stability) - power drop
MP 20x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.20 kg / 11.46 pounds
5200.0 g / 51.0 N
 OK
40 °C -2.2% 5.09 kg / 11.21 pounds
5085.6 g / 49.9 N
 OK
60 °C -4.4% 4.97 kg / 10.96 pounds
4971.2 g / 48.8 N
 OK
80 °C -6.6% 4.86 kg / 10.71 pounds
4856.8 g / 47.6 N
100 °C -28.8% 3.70 kg / 8.16 pounds
3702.4 g / 36.3 N
Standard neodymium magnets irreversibly lose strength above the temperature limit. Avoid high temperatures – high temperature can permanently destroy this magnet. With increasing heat, the neodymium's power temporarily decreases. Refrain from using this magnet in hot environments higher than its operating temperature limit. Too high temperature will result in irreversible degradation of magnetic properties.
*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MP 20x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 54.03 kg / 119.11 pounds
6 121 Gs
8.10 kg / 17.87 pounds
8104 g / 79.5 N
 N/A
1 mm 48.76 kg / 107.50 pounds
11 242 Gs
7.31 kg / 16.13 pounds
7314 g / 71.8 N
 43.89 kg / 96.75 pounds
~0 Gs
2 mm 43.70 kg / 96.34 pounds
10 642 Gs
6.55 kg / 14.45 pounds
6555 g / 64.3 N
 39.33 kg / 86.71 pounds
~0 Gs
3 mm 38.98 kg / 85.94 pounds
10 051 Gs
5.85 kg / 12.89 pounds
5847 g / 57.4 N
 35.08 kg / 77.34 pounds
~0 Gs
5 mm 30.63 kg / 67.54 pounds
8 910 Gs
4.60 kg / 10.13 pounds
4595 g / 45.1 N
 27.57 kg / 60.78 pounds
~0 Gs
10 mm 15.96 kg / 35.19 pounds
6 432 Gs
2.39 kg / 5.28 pounds
2394 g / 23.5 N
 14.36 kg / 31.67 pounds
~0 Gs
20 mm 4.20 kg / 9.26 pounds
3 299 Gs
0.63 kg / 1.39 pounds
630 g / 6.2 N
 3.78 kg / 8.33 pounds
~0 Gs
50 mm 0.19 kg / 0.42 pounds
702 Gs
0.03 kg / 0.06 pounds
29 g / 0.3 N
 0.17 kg / 0.38 pounds
~0 Gs
60 mm 0.09 kg / 0.20 pounds
480 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
 0.08 kg / 0.18 pounds
~0 Gs
70 mm 0.05 kg / 0.10 pounds
342 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
 0.04 kg / 0.09 pounds
~0 Gs
80 mm 0.02 kg / 0.05 pounds
253 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
90 mm 0.01 kg / 0.03 pounds
193 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
150 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a much further distance than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is extreme. The repulsion force is a bit weaker than the connection force, but still impressive.
*Flux density between like poles reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
* Estimates refer to shear force of dual same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MP 20x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.5 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Timepiece 20 Gs (2.0 mT) 9.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field poses a serious hazard to electronics as well as medical implants. These magnets generate a field that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MP 20x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.79 km/h
(6.61 m/s)
 0.19 J
30 mm 24.83 km/h
(6.90 m/s)
 0.21 J
50 mm 24.86 km/h
(6.91 m/s)
 0.21 J
100 mm 24.87 km/h
(6.91 m/s)
 0.21 J
NdFeB products are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or injury to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A collision at high speed means shattering of the neodymium. Wear eye protection when working with large magnets.

Table 9: Surface protection spec
MP 20x10x5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MP 20x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 16 116 Mx 161.2 µWb
Pc Coefficient 1.13 High (Stable)
Flux value passing through the magnet pole. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MP 20x10x5 / N38

Environment Effective steel pull Effect
Air (land) 5.20 kg Standard
Water (riverbed) 5.95 kg
(+0.75 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.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Vertical hold

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

2. Steel saturation

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

3. Thermal stability

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.13

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%

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: 030184-2026
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The ring magnet with a hole MP 20x10x5 / N38 is created for permanent mounting, 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 material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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.
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 (20 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 20 mm and thickness 5 mm. The pulling force of this model is an impressive 5.20 kg, which translates to 50.97 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 10 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for around ten years – the drop is just ~1% (in theory),
  • Neodymium magnets remain highly resistant to loss of magnetic properties caused by external interference,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Considering the possibility of free molding and adaptation to specialized needs, neodymium magnets can be manufactured in a wide range of shapes and sizes, which amplifies use scope,
  • Key role in electronics industry – they serve a role in HDD drives, brushless drives, diagnostic systems, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex forms in magnets, we recommend using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Detachment force of the magnet in optimal conditions – what affects it?

Holding force of 5.20 kg is a theoretical maximum value performed under standard conditions:
  • using a sheet made of mild steel, serving as a magnetic yoke
  • whose transverse dimension is min. 10 mm
  • with a surface cleaned and smooth
  • with total lack of distance (no coatings)
  • during detachment in a direction vertical to the mounting surface
  • at temperature room level

Key elements affecting lifting force

During everyday use, the actual holding force results from several key aspects, presented from crucial:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel gives the best results. Alloy steels reduce magnetic properties and holding force.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Danger to the youngest

Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Store away from kids and pets.

Mechanical processing

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Serious injuries

Pinching hazard: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Magnetic interference

A powerful magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Keep magnets close to a smartphone to prevent breaking the sensors.

Fragile material

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Eye protection is mandatory.

Implant safety

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Safe operation

Handle with care. Rare earth magnets attract from a distance and connect with huge force, often faster than you can move away.

Heat sensitivity

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

Magnetic media

Do not bring magnets close to a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Metal Allergy

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, immediately stop handling magnets and use protective gear.

Danger! Need more info? Check our post: Are neodymium magnets dangerous?