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MPL 20x8x6 / N38 - lamellar magnet

lamellar magnet

Catalog no 020134

GTIN/EAN: 5906301811404

5.00
Load capacity 6.27 kg / 61.50 N Magnetic Induction 423.90 mT / 4239 Gs
length
20 mm [±0,1 mm]
Width
8 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
7.2 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Guides from the knowledge base

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.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical of the product - MPL 20x8x6 / N38 - lamellar magnet

Specification / characteristics - MPL 20x8x6 / N38 - lamellar magnet

properties
properties values
Cat. no. 020134
GTIN/EAN 5906301811404
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 20 mm [±0,1 mm]
Width 8 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 7.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.27 kg / 61.50 N
Magnetic Induction ~ ? 423.90 mT / 4239 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x8x6 / N38 - lamellar magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 modeling of the assembly - technical parameters

Presented data represent the outcome of a engineering analysis. Values rely on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - interaction chart
MPL 20x8x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4236 Gs
423.6 mT
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
 warning
1 mm 3505 Gs
350.5 mT
 4.29 kg / 9.47 lbs
4293.5 g / 42.1 N
 warning
2 mm 2814 Gs
281.4 mT
 2.77 kg / 6.10 lbs
2766.9 g / 27.1 N
 warning
3 mm 2235 Gs
223.5 mT
 1.75 kg / 3.85 lbs
1745.9 g / 17.1 N
 weak grip
5 mm 1425 Gs
142.5 mT
 0.71 kg / 1.56 lbs
709.0 g / 7.0 N
 weak grip
10 mm 540 Gs
54.0 mT
 0.10 kg / 0.22 lbs
101.9 g / 1.0 N
 weak grip
15 mm 248 Gs
24.8 mT
 0.02 kg / 0.05 lbs
21.5 g / 0.2 N
 weak grip
20 mm 131 Gs
13.1 mT
 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
 weak grip
30 mm 48 Gs
4.8 mT
 0.00 kg / 0.00 lbs
0.8 g / 0.0 N
 weak grip
50 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Pulling power weakens drastically with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., dirt, varnish, dust) noticeably diminishes the holding power. Magnets work most effectively in perfect adhesion; distance kills the power. Observe how rapidly the parameters drop, when the magnet does not adhere flatly to the steel surface. When calculating the mounting, discard unnecessary gaps.

Table 2: Sliding capacity (wall)
MPL 20x8x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.25 kg / 2.76 lbs
1254.0 g / 12.3 N
1 mm Stal (~0.2) 0.86 kg / 1.89 lbs
858.0 g / 8.4 N
2 mm Stal (~0.2) 0.55 kg / 1.22 lbs
554.0 g / 5.4 N
3 mm Stal (~0.2) 0.35 kg / 0.77 lbs
350.0 g / 3.4 N
5 mm Stal (~0.2) 0.14 kg / 0.31 lbs
142.0 g / 1.4 N
10 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data defines the estimated force required to initiate the downward movement of the magnet downwards against a upright steel plate (considering standard friction coefficient). This parameter is relative to the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 20x8x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.88 kg / 4.15 lbs
1881.0 g / 18.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.25 kg / 2.76 lbs
1254.0 g / 12.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.63 kg / 1.38 lbs
627.0 g / 6.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.14 kg / 6.91 lbs
3135.0 g / 30.8 N
When mounting a holder on a upright wall (e.g., a board), it you can count on just approx. 20%-30% of its maximum pull force. Gravity and a low friction coefficient influence the fact that holders move down easier than they pop off the substrate. Want to create a hanger? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a noticeably lighter cargo. Utilizing a rubberized pad can significantly increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 20x8x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.63 kg / 1.38 lbs
627.0 g / 6.2 N
1 mm
25%
 1.57 kg / 3.46 lbs
1567.5 g / 15.4 N
2 mm
50%
 3.14 kg / 6.91 lbs
3135.0 g / 30.8 N
3 mm
75%
 4.70 kg / 10.37 lbs
4702.5 g / 46.1 N
5 mm
100%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
10 mm
100%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
11 mm
100%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
12 mm
100%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
A thin sheet cannot focus the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The material oversaturation means that on thin elements (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - resistance threshold
MPL 20x8x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
 OK
40 °C -2.2% 6.13 kg / 13.52 lbs
6132.1 g / 60.2 N
 OK
60 °C -4.4% 5.99 kg / 13.21 lbs
5994.1 g / 58.8 N
80 °C -6.6% 5.86 kg / 12.91 lbs
5856.2 g / 57.4 N
100 °C -28.8% 4.46 kg / 9.84 lbs
4464.2 g / 43.8 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Avoid high temperatures – excessive heat can permanently demagnetize this magnet. With increasing heat, the neodymium's force momentarily lowers. Do not use this magnet in hot environments exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetic properties.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) may lose charge permanently under lower heat stress compared to rod magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MPL 20x8x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.70 kg / 39.02 lbs
5 386 Gs
2.66 kg / 5.85 lbs
2655 g / 26.0 N
 N/A
1 mm 14.82 kg / 32.66 lbs
7 751 Gs
2.22 kg / 4.90 lbs
2222 g / 21.8 N
 13.33 kg / 29.40 lbs
~0 Gs
2 mm 12.12 kg / 26.72 lbs
7 011 Gs
1.82 kg / 4.01 lbs
1818 g / 17.8 N
 10.91 kg / 24.05 lbs
~0 Gs
3 mm 9.78 kg / 21.55 lbs
6 296 Gs
1.47 kg / 3.23 lbs
1466 g / 14.4 N
 8.80 kg / 19.40 lbs
~0 Gs
5 mm 6.21 kg / 13.69 lbs
5 018 Gs
0.93 kg / 2.05 lbs
932 g / 9.1 N
 5.59 kg / 12.32 lbs
~0 Gs
10 mm 2.00 kg / 4.41 lbs
2 849 Gs
0.30 kg / 0.66 lbs
300 g / 2.9 N
 1.80 kg / 3.97 lbs
~0 Gs
20 mm 0.29 kg / 0.63 lbs
1 080 Gs
0.04 kg / 0.10 lbs
43 g / 0.4 N
 0.26 kg / 0.57 lbs
~0 Gs
50 mm 0.01 kg / 0.01 lbs
153 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
97 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
65 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
45 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
33 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
25 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and sheet setup. The setup of two magnets generates a stronger field and a larger range of operation. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is massive. The levitation is a bit weaker than the connection force, but still significant.
*Field value for N-N configuration drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Results apply to shear force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MPL 20x8x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field poses a large risk to electronic devices as well as medical implants. These magnets produce a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field penetrates the body and plastic. Special caution must be exercised by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MPL 20x8x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.84 km/h
(6.35 m/s)
 0.14 J
30 mm 23.10 km/h
(6.42 m/s)
 0.15 J
50 mm 23.10 km/h
(6.42 m/s)
 0.15 J
100 mm 23.11 km/h
(6.42 m/s)
 0.15 J
NdFeB products are delicate – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 20x8x6 / 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)
MPL 20x8x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 558 Mx 65.6 µWb
Pc Coefficient 0.52 Low (Flat)
Flux value emitted by the pole surface. Key data in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 20x8x6 / N38

Environment Effective steel pull Effect
Air (land) 6.27 kg Standard
Water (riverbed) 7.18 kg
(+0.91 kg buoyancy gain)
+14.5%
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. Shear force

*Note: On a vertical surface, the magnet holds merely ~20% of its nominal pull.

2. Steel saturation

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.52

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: 020134-2026
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Advantages as well as disadvantages of neodymium magnets.

Benefits

Apart from their strong power, neodymium magnets have these key benefits:
  • They retain attractive force for around ten years – the drop is just ~1% (according to analyses),
  • They possess excellent resistance to magnetic field loss as a result of external fields,
  • By using a smooth layer of gold, the element presents an proper look,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • In view of the ability of accurate shaping and customization to specialized requirements, magnetic components can be created in a broad palette of geometric configurations, which expands the range of possible applications,
  • Significant place in advanced technology sectors – they are used in data components, electric drive systems, diagnostic systems, as well as modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using cover - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The load parameter shown refers to the maximum value, obtained under optimal environment, namely:
  • with the application of a yoke made of special test steel, ensuring full magnetic saturation
  • with a thickness minimum 10 mm
  • characterized by lack of roughness
  • with zero gap (without coatings)
  • under perpendicular force direction (90-degree angle)
  • in stable room temperature

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding will differ subject to the following factors, in order of importance:
  • Air gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.

H&S for magnets
Electronic hazard

Do not bring magnets close to a purse, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Nickel coating and allergies

Studies show that nickel (the usual finish) is a strong allergen. If you have an allergy, avoid direct skin contact and select versions in plastic housing.

GPS Danger

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Medical interference

People with a heart stimulator must maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Dust is flammable

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Eye protection

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Handling guide

Exercise caution. Rare earth magnets attract from a distance and connect with huge force, often quicker than you can react.

Operating temperature

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

Keep away from children

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

Crushing risk

Large magnets can smash fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Security! Want to know more? Read our article: Are neodymium magnets dangerous?