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MP 20x8/4x3 / N38 - ring magnet

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

ring magnet

Catalog no 030187

GTIN/EAN: 5906301812043

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

3.14 kg / 30.79 N

Magnetic Induction

178.11 mT / 1781 Gs

Coating

[NiCuNi] Nickel

technical specifications »

3.59 ZŁ with VAT / pcs + price for transport

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Product card - MP 20x8/4x3 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x3 / N38 - ring magnet

properties

properties	values
Cat. no.	030187
GTIN/EAN	5906301812043
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	8/4 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	6.79 g
Magnetization Direction	↑ axial
Load capacity ~ ?	3.14 kg / 30.79 N
Magnetic Induction ~ ?	178.11 mT / 1781 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x3 / 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

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 - report

Presented information represent the outcome of a mathematical analysis. Values were calculated on algorithms for the material Nd₂Fe₁₄B. Operational performance might slightly differ from theoretical values. Use these data as a supplementary guide for designers.

Table 1: Static force (force vs gap) - power drop
MP 20x8/4x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg/lbs/g/N)	Risk Status
0 mm	1531 Gs 153.1 mT	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N	strong
1 mm	1457 Gs 145.7 mT	2.84 kg / 6.27 LBS 2843.2 g / 27.9 N	strong
2 mm	1352 Gs 135.2 mT	2.45 kg / 5.39 LBS 2446.6 g / 24.0 N	strong
3 mm	1227 Gs 122.7 mT	2.02 kg / 4.44 LBS 2016.2 g / 19.8 N	strong
5 mm	963 Gs 96.3 mT	1.24 kg / 2.74 LBS 1241.9 g / 12.2 N	weak grip
10 mm	465 Gs 46.5 mT	0.29 kg / 0.64 LBS 289.3 g / 2.8 N	weak grip
15 mm	228 Gs 22.8 mT	0.07 kg / 0.15 LBS 69.7 g / 0.7 N	weak grip
20 mm	122 Gs 12.2 mT	0.02 kg / 0.04 LBS 20.0 g / 0.2 N	weak grip
30 mm	45 Gs 4.5 mT	0.00 kg / 0.01 LBS 2.7 g / 0.0 N	weak grip
50 mm	11 Gs 1.1 mT	0.00 kg / 0.00 LBS 0.2 g / 0.0 N	weak grip

Magnetic force decreases significantly per each millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, paint, veneer) noticeably diminishes the holding power. Magnetic products hold optimally at the point of direct contact; distance kills the power. Observe how quickly the pull force plummet, when the product does not touch tightly to the steel surface. When planning the mounting, discard additional spacers.

Table 2: Sliding capacity (vertical surface)
MP 20x8/4x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg/lbs/g/N)
0 mm	Stal (~0.2)	0.63 kg / 1.38 LBS 628.0 g / 6.2 N
1 mm	Stal (~0.2)	0.57 kg / 1.25 LBS 568.0 g / 5.6 N
2 mm	Stal (~0.2)	0.49 kg / 1.08 LBS 490.0 g / 4.8 N
3 mm	Stal (~0.2)	0.40 kg / 0.89 LBS 404.0 g / 4.0 N
5 mm	Stal (~0.2)	0.25 kg / 0.55 LBS 248.0 g / 2.4 N
10 mm	Stal (~0.2)	0.06 kg / 0.13 LBS 58.0 g / 0.6 N
15 mm	Stal (~0.2)	0.01 kg / 0.03 LBS 14.0 g / 0.1 N
20 mm	Stal (~0.2)	0.00 kg / 0.01 LBS 4.0 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

This section defines the approximate holding capacity required to initiate the sliding of the magnet downwards along a upright steel wall (assuming standard friction). The holding force is a function of the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 20x8/4x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg/lbs/g/N)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.94 kg / 2.08 LBS 942.0 g / 9.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.63 kg / 1.38 LBS 628.0 g / 6.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.31 kg / 0.69 LBS 314.0 g / 3.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.57 kg / 3.46 LBS 1570.0 g / 15.4 N

When mounting a magnet on a upright surface (e.g., a board), it will only hold just approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient mean that products slip easier than they pop off the substrate. Planning a hanger? Note that the sliding force is noticeably lower than the maximum static pull force. On a slippery surface, the element will slide down under a much lighter load. Using a rubber coating can drastically increase the grip.

Table 4: Steel thickness (saturation) - power losses
MP 20x8/4x3 / N38

Steel thickness (mm)	% power	Real pull force (kg/lbs/g/N)
0.5 mm	10%	0.31 kg / 0.69 LBS 314.0 g / 3.1 N
1 mm	25%	0.79 kg / 1.73 LBS 785.0 g / 7.7 N
2 mm	50%	1.57 kg / 3.46 LBS 1570.0 g / 15.4 N
3 mm	75%	2.36 kg / 5.19 LBS 2355.0 g / 23.1 N
5 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N
10 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N
11 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N
12 mm	100%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N

A thin sheet is not enough to absorb the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MP 20x8/4x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull (kg/lbs/g/N)	Status
20 °C	0.0%	3.14 kg / 6.92 LBS 3140.0 g / 30.8 N	OK
40 °C	-2.2%	3.07 kg / 6.77 LBS 3070.9 g / 30.1 N	OK
60 °C	-4.4%	3.00 kg / 6.62 LBS 3001.8 g / 29.4 N
80 °C	-6.6%	2.93 kg / 6.47 LBS 2932.8 g / 28.8 N
100 °C	-28.8%	2.24 kg / 4.93 LBS 2235.7 g / 21.9 N

Classic neodymiums lose strength above the temperature limit. Protect against heat – excessive heat can permanently damage this product. As the temperature rises, the neodymium's power temporarily lowers. Do not use this product near heat sources exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 20x8/4x3 / N38

Gap (mm)	Attraction (kg/lbs) (N-S)	Lateral Force (kg/lbs/g/N)	Repulsion (kg/lbs) (N-N)
0 mm	3.71 kg / 8.17 LBS 2 815 Gs	0.56 kg / 1.23 LBS 556 g / 5.5 N	N/A
1 mm	3.55 kg / 7.83 LBS 2 998 Gs	0.53 kg / 1.17 LBS 533 g / 5.2 N	3.20 kg / 7.05 LBS ~0 Gs
2 mm	3.36 kg / 7.40 LBS 2 915 Gs	0.50 kg / 1.11 LBS 503 g / 4.9 N	3.02 kg / 6.66 LBS ~0 Gs
3 mm	3.13 kg / 6.90 LBS 2 815 Gs	0.47 kg / 1.04 LBS 470 g / 4.6 N	2.82 kg / 6.21 LBS ~0 Gs
5 mm	2.63 kg / 5.81 LBS 2 582 Gs	0.40 kg / 0.87 LBS 395 g / 3.9 N	2.37 kg / 5.23 LBS ~0 Gs
10 mm	1.47 kg / 3.23 LBS 1 926 Gs	0.22 kg / 0.48 LBS 220 g / 2.2 N	1.32 kg / 2.91 LBS ~0 Gs
20 mm	0.34 kg / 0.75 LBS 930 Gs	0.05 kg / 0.11 LBS 51 g / 0.5 N	0.31 kg / 0.68 LBS ~0 Gs
50 mm	0.01 kg / 0.02 LBS 143 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 90 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 59 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 41 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 30 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 22 Gs	0.00 kg / 0.00 LBS 0 g / 0.0 N	0.00 kg / 0.00 LBS ~0 Gs

Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet produces a massive flux and a wider radius of operation. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is extreme. The levitation is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Attention: Calculations apply to sliding force of dual matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MP 20x8/4x3 / 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
Timepiece	20 Gs (2.0 mT)	4.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.5 cm
Car key	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

Powerful magnet radiation poses a real danger to IT equipment as well as pacemakers. These magnets generate a flux that disrupts operation of digital equipment. Notice: the unseen radiation passes through tissues and plastic. Special caution must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MP 20x8/4x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.90 km/h (6.36 m/s)	0.14 J
30 mm	37.58 km/h (10.44 m/s)	0.37 J
50 mm	48.50 km/h (13.47 m/s)	0.62 J
100 mm	68.58 km/h (19.05 m/s)	1.23 J

NdFeB products are delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or painful pinches to skin. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Corrosion resistance
MP 20x8/4x3 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (P_c)
MP 20x8/4x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	5 044 Mx	50.4 µWb
P_c Coefficient	0.20	Low (Flat)

Flux value passing through the pole surface. Essential parameter when building generators and motors. The P_c coefficient determines the magnet's operating point.

Table 11: Submerged application
MP 20x8/4x3 / N38

Environment	Effective steel pull	Effect
Air (land)	3.14 kg	Standard
Water (riverbed)	3.60 kg (+0.46 kg buoyancy gain)	+14.5%

Rust risk: 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)

*Warning: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Thermal stability

*For standard magnets, 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) = 0.20

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 and environmental data

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: 030187-2026

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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. 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 20x8/4x3 / N38. Neodymium magnets are sintered ceramics, which means they are hard but breakable and inelastic. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. 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 is not sufficient for rain. 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.

A screw or bolt with a thread diameter smaller than 8/4 mm fits this model. 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 (20 mm), so it doesn't protrude beyond the outline.

The presented product is a ring magnet with dimensions Ø20 mm (outer diameter) and height 3 mm. The pulling force of this model is an impressive 3.14 kg, which translates to 30.79 N in newtons. The mounting hole diameter is precisely 8/4 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.

Strengths as well as weaknesses of neodymium magnets.

Strengths

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

They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
Magnets perfectly protect themselves against loss of magnetization caused by foreign field sources,
Thanks to the metallic finish, the plating of Ni-Cu-Ni, gold, or silver gives an modern appearance,
They are known for high magnetic induction at the operating surface, which increases their power,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
Possibility of detailed forming and adapting to defined requirements,
Significant place in innovative solutions – they are commonly used in magnetic memories, motor assemblies, advanced medical instruments, also industrial machines.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
We warn that neodymium magnets can lose their strength 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 suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
We recommend casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these products can disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

The declared magnet strength refers to the limit force, obtained under laboratory conditions, specifically:

on a plate made of mild steel, optimally conducting the magnetic field
whose thickness is min. 10 mm
with an ground contact surface
without any clearance between the magnet and steel
during detachment in a direction vertical to the mounting surface
at standard ambient temperature

Magnet lifting force in use – key factors

Please note that the magnet holding may be lower depending on elements below, starting with the most relevant:

Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets

Magnetic media

Avoid bringing magnets near a purse, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Maximum temperature

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Dust explosion hazard

Dust produced during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Danger to pacemakers

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

This is not a toy

Only for adults. Small elements can be swallowed, leading to serious injuries. Keep out of reach of children and animals.

Precision electronics

Be aware: rare earth magnets generate a field that confuses precision electronics. Keep a safe distance from your phone, device, and GPS.

Crushing force

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Allergic reactions

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact and opt for versions in plastic housing.

Beware of splinters

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.

Safe operation

Handle with care. Neodymium magnets attract from a long distance and connect with massive power, often faster than you can move away.

Security! Looking for details? Read our article: Are neodymium magnets dangerous?

MP 20x8/4x3 / N38 - ring magnet

Product card - MP 20x8/4x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the magnet - report

Table 1: Static force (force vs gap) - power drop MP 20x8/4x3 / N38

Table 2: Sliding capacity (vertical surface) MP 20x8/4x3 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MP 20x8/4x3 / N38

Table 4: Steel thickness (saturation) - power losses MP 20x8/4x3 / N38

Table 5: Thermal stability (stability) - thermal limit MP 20x8/4x3 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system MP 20x8/4x3 / N38

Table 7: Safety (HSE) (implants) - precautionary measures MP 20x8/4x3 / N38

Table 8: Collisions (kinetic energy) - collision effects MP 20x8/4x3 / N38

Table 9: Corrosion resistance MP 20x8/4x3 / N38

Table 10: Electrical data (Pc) MP 20x8/4x3 / N38

Table 11: Submerged application MP 20x8/4x3 / N38

1. Wall mount (shear)

2. Steel thickness impact

3. Thermal stability

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

Material specification

Environmental data

Pulling force

Magnetic Field

See also offers

MP 10x4.3x4 / N38 - ring magnet

HH 36x7.5 [M6] / N38 - through hole magnetic holder

UMC 36x6/4X8 / N38 - cylindrical magnetic holder

SM 32x200 [2xM8] / N52 - magnetic separator

Strengths as well as weaknesses of neodymium magnets.

Strengths

Cons

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Magnet lifting force in use – key factors

H&S for magnets

Magnetic media

Maximum temperature

Dust explosion hazard

Danger to pacemakers

This is not a toy

Precision electronics

Crushing force

Allergic reactions

Beware of splinters

Safe operation

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - power drop
MP 20x8/4x3 / N38

Table 2: Sliding capacity (vertical surface)
MP 20x8/4x3 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MP 20x8/4x3 / N38

Table 4: Steel thickness (saturation) - power losses
MP 20x8/4x3 / N38

Table 5: Thermal stability (stability) - thermal limit
MP 20x8/4x3 / N38

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 20x8/4x3 / N38

Table 7: Safety (HSE) (implants) - precautionary measures
MP 20x8/4x3 / N38

Table 8: Collisions (kinetic energy) - collision effects
MP 20x8/4x3 / N38

Table 9: Corrosion resistance
MP 20x8/4x3 / N38

Table 10: Electrical data (P_c)
MP 20x8/4x3 / N38

Table 11: Submerged application
MP 20x8/4x3 / N38