Product available Ships today (order by 14:00)

MW 8x20 / N38 - cylindrical magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

cylindrical magnet

Catalog no 010475

GTIN/EAN: 5906301811138

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

1.30 kg / 12.71 N

Magnetic Induction

607.01 mT / 6070 Gs

Coating

[NiCuNi] Nickel

technical details »

4.60 ZŁ with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

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Detailed specification - MW 8x20 / N38 - cylindrical magnet

Specification / characteristics - MW 8x20 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010475
GTIN/EAN	5906301811138
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 Ø	8 mm [±0,1 mm]
Height	20 mm [±0,1 mm]
Weight	7.54 g
Magnetization Direction	→ diametrical
Load capacity ~ ?	1.30 kg / 12.71 N
Magnetic Induction ~ ?	607.01 mT / 6070 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x20 / N38 - cylindrical 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

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 simulation of the magnet - technical parameters

The following information are the result of a engineering analysis. Results rely on models for the material Nd₂Fe₁₄B. Operational conditions may deviate from the simulation results. Treat these data as a reference point during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MW 8x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6064 Gs 606.4 mT	1.30 kg / 1300.0 g 12.8 N	low risk
1 mm	4587 Gs 458.7 mT	0.74 kg / 743.7 g 7.3 N	low risk
2 mm	3327 Gs 332.7 mT	0.39 kg / 391.4 g 3.8 N	low risk
3 mm	2388 Gs 238.8 mT	0.20 kg / 201.6 g 2.0 N	low risk
5 mm	1281 Gs 128.1 mT	0.06 kg / 58.0 g 0.6 N	low risk
10 mm	389 Gs 38.9 mT	0.01 kg / 5.4 g 0.1 N	low risk
15 mm	169 Gs 16.9 mT	0.00 kg / 1.0 g 0.0 N	low risk
20 mm	90 Gs 9.0 mT	0.00 kg / 0.3 g 0.0 N	low risk
30 mm	35 Gs 3.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	10 Gs 1.0 mT	0.00 kg / 0.0 g 0.0 N	low risk

Magnetic force decreases sharply with every mm of gap. Remember that even the smallest gap (e.g., dirt, paint, rust) strongly diminishes the holding power. Neodymiums operate most effectively at the point of direct contact; air break nullifies the power. Notice how flashily the parameters fall, when the magnet does not adhere flatly to the steel surface. When planning the mounting, eliminate additional spacers.

Table 2: Sliding load (vertical surface)
MW 8x20 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.26 kg / 260.0 g 2.6 N
1 mm	Stal (~0.2)	0.15 kg / 148.0 g 1.5 N
2 mm	Stal (~0.2)	0.08 kg / 78.0 g 0.8 N
3 mm	Stal (~0.2)	0.04 kg / 40.0 g 0.4 N
5 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
10 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data shows the theoretical force necessary to initiate the sliding of the magnet vertically against a vertical steel wall (considering typical friction coefficient). This value is relative to the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.39 kg / 390.0 g 3.8 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.26 kg / 260.0 g 2.6 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.13 kg / 130.0 g 1.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.65 kg / 650.0 g 6.4 N

When placing a element on a upright surface (e.g., a board), it you can count on barely about 1/5 of its nominal power. Gravitational force and a low friction coefficient mean that magnets move down easier than they pull off. Want to create a wall mount? Note that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the element will slip down under a significantly smaller weight. Utilizing a rubberized layer can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x20 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.13 kg / 130.0 g 1.3 N
1 mm	25%	0.33 kg / 325.0 g 3.2 N
2 mm	50%	0.65 kg / 650.0 g 6.4 N
5 mm	100%	1.30 kg / 1300.0 g 12.8 N
10 mm	100%	1.30 kg / 1300.0 g 12.8 N

A too thin steel cannot take in the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a thin surface, the field will penetrate right through and the attraction force will be weaker. To achieve full efficiency of this magnet's power, you need a suitably thick element of metal. The saturation effect causes that on thin elements (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MW 8x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.30 kg / 1300.0 g 12.8 N	OK
40 °C	-2.2%	1.27 kg / 1271.4 g 12.5 N	OK
60 °C	-4.4%	1.24 kg / 1242.8 g 12.2 N	OK
80 °C	-6.6%	1.21 kg / 1214.2 g 11.9 N
100 °C	-28.8%	0.93 kg / 925.6 g 9.1 N

Classic neodymiums irreversibly lose strength past the thermal threshold. Watch out for overheating – high temperature can irreversibly destroy this magnet. As the temperature rises, the neodymium's force momentarily lowers. Avoid using this magnet close to heaters higher than its working range. Ignoring the limit will lead to destruction of magnetism.

*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field range
MW 8x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	11.40 kg / 11396 g 111.8 N 6 154 Gs	N/A
1 mm	8.76 kg / 8758 g 85.9 N 10 632 Gs	7.88 kg / 7882 g 77.3 N ~0 Gs
2 mm	6.52 kg / 6520 g 64.0 N 9 174 Gs	5.87 kg / 5868 g 57.6 N ~0 Gs
3 mm	4.76 kg / 4758 g 46.7 N 7 837 Gs	4.28 kg / 4282 g 42.0 N ~0 Gs
5 mm	2.46 kg / 2461 g 24.1 N 5 637 Gs	2.22 kg / 2215 g 21.7 N ~0 Gs
10 mm	0.51 kg / 508 g 5.0 N 2 561 Gs	0.46 kg / 457 g 4.5 N ~0 Gs
20 mm	0.05 kg / 47 g 0.5 N 778 Gs	0.04 kg / 42 g 0.4 N ~0 Gs
50 mm	0.00 kg / 1 g 0.0 N 107 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets interact from a much further distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a larger range of operation. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is a bit weaker than the attraction, but still large.
*Flux density in repulsion mode drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Hazards (implants) - precautionary measures
MW 8x20 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.5 cm
Hearing aid	10 Gs (1.0 mT)	5.0 cm
Timepiece	20 Gs (2.0 mT)	4.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.0 cm
Remote	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation poses a real danger to electronics and medical implants. These NdFeB products produce a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and glass. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MW 8x20 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	13.28 km/h (3.69 m/s)	0.05 J
30 mm	22.94 km/h (6.37 m/s)	0.15 J
50 mm	29.61 km/h (8.23 m/s)	0.26 J
100 mm	41.88 km/h (11.63 m/s)	0.51 J

Magnetic elements are delicate – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to skin. Always hold the magnet during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Anti-corrosion coating durability
MW 8x20 / 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)
MW 8x20 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	3 457 Mx	34.6 µWb
P_c Coefficient	1.31	High (Stable)

Flux value emitted by the magnet pole. Essential parameter when building generators and motors. P_c value determines the working geometry.

Table 11: Physics of underwater searching
MW 8x20 / N38

Environment	Effective steel pull	Effect
Air (land)	1.30 kg	Standard
Water (riverbed)	1.49 kg (+0.19 kg Buoyancy gain)	+14.5%

Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.31

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 P_c (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 P_c 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

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%

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: 010475-2025

Quick Unit Converter

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UMH 36x8x46 [M6] / N38 - magnetic holder with hook

26.64 ZŁ brutto / pcs

The offered product is an exceptionally strong cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø8x20 mm, guarantees maximum efficiency. This specific item boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 1.30 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.

This model is perfect for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 12.71 N with a weight of only 7.54 g, this rod is indispensable in miniature devices and wherever every gram matters.

Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using two-component epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.

Magnets N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø8x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.

This model is characterized by dimensions Ø8x20 mm, which, at a weight of 7.54 g, makes it an element with impressive magnetic energy density. The value of 12.71 N means that the magnet is capable of holding a weight many times exceeding its own mass of 7.54 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.

This cylinder is magnetized axially (along the height of 20 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros and cons of Nd₂Fe₁₄B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (theoretically),
They maintain their magnetic properties even under external field action,
In other words, due to the glossy finish of gold, the element is aesthetically pleasing,
Magnetic induction on the working layer of the magnet turns out to be impressive,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
Possibility of detailed machining and adjusting to precise needs,
Key role in advanced technology sectors – they serve a role in mass storage devices, brushless drives, medical equipment, and industrial machines.
Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Problematic aspects of neodymium magnets and ways of using them

At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical in case of swallowing.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

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

Magnet power was determined for ideal contact conditions, taking into account:

with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
with a cross-section of at least 10 mm
with a surface free of scratches
under conditions of gap-free contact (metal-to-metal)
under vertical application of breakaway force (90-degree angle)
in neutral thermal conditions

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, including (from priority):

Clearance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
Angle of force application – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Steel type – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and holding force.
Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

H&S for magnets

Avoid contact if allergic

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and choose encased magnets.

Fragile material

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Life threat

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Bone fractures

Big blocks can crush fingers in a fraction of a second. Do not place your hand betwixt two attracting surfaces.

Combustion hazard

Powder created during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Safe operation

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.

Demagnetization risk

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

Threat to navigation

A strong magnetic field disrupts the functioning of compasses in phones and GPS navigation. Do not bring magnets near a device to prevent breaking the sensors.

Safe distance

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Keep away from children

Product intended for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep out of reach of kids and pets.

Important! Details about hazards in the article: Magnet Safety Guide.

MW 8x20 / N38 - cylindrical magnet

Detailed specification - MW 8x20 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the magnet - technical parameters

Table 1: Static force (force vs gap) - characteristics MW 8x20 / N38

Table 2: Sliding load (vertical surface) MW 8x20 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MW 8x20 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MW 8x20 / N38

Table 5: Thermal stability (stability) - thermal limit MW 8x20 / N38

Table 6: Two magnets (attraction) - field range MW 8x20 / N38

Table 7: Hazards (implants) - precautionary measures MW 8x20 / N38

Table 8: Impact energy (cracking risk) - warning MW 8x20 / N38

Table 9: Anti-corrosion coating durability MW 8x20 / N38

Table 10: Construction data (Flux) MW 8x20 / N38

Table 11: Physics of underwater searching MW 8x20 / N38

1. Vertical hold

2. Steel saturation

3. Heat tolerance

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

Elemental analysis

Sustainability

Pulling force

Magnetic Field

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MPL 11x11x1 / N38 - lamellar magnet

MW 7x2 / N38 - cylindrical magnet

UMH 36x8x46 [M6] / N38 - magnetic holder with hook

Pros and cons of Nd2Fe14B magnets.

Pros

Cons

Holding force characteristics

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

Lifting capacity in real conditions – factors

H&S for magnets

Avoid contact if allergic

Fragile material

Life threat

Bone fractures

Combustion hazard

Safe operation

Demagnetization risk

Threat to navigation

Safe distance

Keep away from children

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - characteristics
MW 8x20 / N38

Table 2: Sliding load (vertical surface)
MW 8x20 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x20 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x20 / N38

Table 5: Thermal stability (stability) - thermal limit
MW 8x20 / N38

Table 6: Two magnets (attraction) - field range
MW 8x20 / N38

Table 7: Hazards (implants) - precautionary measures
MW 8x20 / N38

Table 8: Impact energy (cracking risk) - warning
MW 8x20 / N38

Table 9: Anti-corrosion coating durability
MW 8x20 / N38

Table 10: Construction data (Flux)
MW 8x20 / N38

Table 11: Physics of underwater searching
MW 8x20 / N38

Pros and cons of Nd₂Fe₁₄B magnets.