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MP 20x8/4x5 / 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: 1-6500
Rating: 5

ring magnet

Catalog no 030333

GTIN/EAN: 5906301812272

5.00

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.31 g

Magnetization Direction

↑ axial

Load capacity

6.65 kg / 65.21 N

Magnetic Induction

277.16 mT / 2772 Gs

Coating

[NiCuNi] Nickel

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7.75 ZŁ with VAT / pcs + price for transport

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Physical properties - MP 20x8/4x5 / N38 - ring magnet

Specification / characteristics - MP 20x8/4x5 / N38 - ring magnet

properties

properties	values
Cat. no.	030333
GTIN/EAN	5906301812272
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	5 mm [±0,1 mm]
Weight	11.31 g
Magnetization Direction	↑ axial
Load capacity ~ ?	6.65 kg / 65.21 N
Magnetic Induction ~ ?	277.16 mT / 2772 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 20x8/4x5 / 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

Technical modeling of the assembly - technical parameters

The following values are the direct effect of a engineering analysis. Results rely on models for the class Nd₂Fe₁₄B. Real-world conditions might slightly differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - power drop
MP 20x8/4x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2424 Gs 242.4 mT	6.65 kg / 6650.0 g 65.2 N	warning
1 mm	2265 Gs 226.5 mT	5.81 kg / 5807.9 g 57.0 N	warning
2 mm	2070 Gs 207.0 mT	4.85 kg / 4851.0 g 47.6 N	warning
3 mm	1858 Gs 185.8 mT	3.91 kg / 3906.5 g 38.3 N	warning
5 mm	1437 Gs 143.7 mT	2.34 kg / 2338.7 g 22.9 N	warning
10 mm	691 Gs 69.1 mT	0.54 kg / 540.5 g 5.3 N	weak grip
15 mm	343 Gs 34.3 mT	0.13 kg / 133.3 g 1.3 N	weak grip
20 mm	186 Gs 18.6 mT	0.04 kg / 39.3 g 0.4 N	weak grip
30 mm	70 Gs 7.0 mT	0.01 kg / 5.5 g 0.1 N	weak grip
50 mm	18 Gs 1.8 mT	0.00 kg / 0.4 g 0.0 N	weak grip

Magnetic force decreases drastically per each millimeter of gap. Keep in mind that every additional insulation layer (e.g., dirt, varnish, dust) strongly diminishes the holding power. Magnetic products hold most effectively during direct contact; air break kills the power. Analyze how quickly the load capacity drop, when the product does not adhere directly to the steel surface. When planning the assembly, discard redundant distances.

Table 2: Shear capacity (wall)
MP 20x8/4x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.33 kg / 1330.0 g 13.0 N
1 mm	Stal (~0.2)	1.16 kg / 1162.0 g 11.4 N
2 mm	Stal (~0.2)	0.97 kg / 970.0 g 9.5 N
3 mm	Stal (~0.2)	0.78 kg / 782.0 g 7.7 N
5 mm	Stal (~0.2)	0.47 kg / 468.0 g 4.6 N
10 mm	Stal (~0.2)	0.11 kg / 108.0 g 1.1 N
15 mm	Stal (~0.2)	0.03 kg / 26.0 g 0.3 N
20 mm	Stal (~0.2)	0.01 kg / 8.0 g 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data presents the approximate weight limit needed to initiate the shifting of the magnet vertically on a upright steel wall (considering standard friction coefficient). The holding force is a function of the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MP 20x8/4x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.00 kg / 1995.0 g 19.6 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.33 kg / 1330.0 g 13.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.67 kg / 665.0 g 6.5 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.33 kg / 3325.0 g 32.6 N

When placing a magnet on a vertical plane (e.g., a fridge), it will maintain just approx. 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient mean that products move down faster than they detach. Want to create a vertical fastening? Remember that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will slip down under a much lighter weight. Application of an anti-slip pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 20x8/4x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.67 kg / 665.0 g 6.5 N
1 mm	25%	1.66 kg / 1662.5 g 16.3 N
2 mm	50%	3.33 kg / 3325.0 g 32.6 N
5 mm	100%	6.65 kg / 6650.0 g 65.2 N
10 mm	100%	6.65 kg / 6650.0 g 65.2 N

A too thin steel is unable to conduct the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a thin surface, the field will pass right through and the pull force will drop sharply. To utilize 100% of this magnet's potential, you require a sufficiently solid piece of metal. The saturation effect means that on thin elements (e.g., thin profiles), the holder works worse. We recommend selecting the steel thickness from these parameters.

Table 5: Working in heat (material behavior) - resistance threshold
MP 20x8/4x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	6.65 kg / 6650.0 g 65.2 N	OK
40 °C	-2.2%	6.50 kg / 6503.7 g 63.8 N	OK
60 °C	-4.4%	6.36 kg / 6357.4 g 62.4 N
80 °C	-6.6%	6.21 kg / 6211.1 g 60.9 N
100 °C	-28.8%	4.73 kg / 4734.8 g 46.4 N

Standard neodymium magnets lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently demagnetize this product. With every degree above norm, the magnet's capacity temporarily lowers. Do not use this magnet close to heaters exceeding its safe range. Too high temperature will cause destruction of magnetic properties.

*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MP 20x8/4x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	9.28 kg / 9284 g 91.1 N 4 012 Gs	N/A
1 mm	8.73 kg / 8732 g 85.7 N 4 701 Gs	7.86 kg / 7859 g 77.1 N ~0 Gs
2 mm	8.11 kg / 8108 g 79.5 N 4 530 Gs	7.30 kg / 7297 g 71.6 N ~0 Gs
3 mm	7.45 kg / 7448 g 73.1 N 4 342 Gs	6.70 kg / 6703 g 65.8 N ~0 Gs
5 mm	6.10 kg / 6102 g 59.9 N 3 930 Gs	5.49 kg / 5492 g 53.9 N ~0 Gs
10 mm	3.27 kg / 3265 g 32.0 N 2 875 Gs	2.94 kg / 2939 g 28.8 N ~0 Gs
20 mm	0.75 kg / 755 g 7.4 N 1 382 Gs	0.68 kg / 679 g 6.7 N ~0 Gs
50 mm	0.02 kg / 19 g 0.2 N 220 Gs	0.02 kg / 17 g 0.2 N ~0 Gs

Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. Such a system of magnet-to-magnet creates a more powerful interaction and a further horizon of operation. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is huge. The repulsion force is slightly lower than the attraction, but still large.
*Field value between like poles is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).

Table 7: Safety (HSE) (electronics) - warnings
MP 20x8/4x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	8.0 cm
Hearing aid	10 Gs (1.0 mT)	6.5 cm
Mechanical watch	20 Gs (2.0 mT)	5.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	4.0 cm
Car key	50 Gs (5.0 mT)	3.5 cm
Payment card	400 Gs (40.0 mT)	1.5 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Powerful magnet radiation poses a large risk to electronics and medical implants. These neodymiums produce a flux that destroys function of digital equipment. Be aware: the unseen radiation penetrates the body and plastic. Exceptional care must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MP 20x8/4x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	25.67 km/h (7.13 m/s)	0.29 J
30 mm	42.38 km/h (11.77 m/s)	0.78 J
50 mm	54.68 km/h (15.19 m/s)	1.30 J
100 mm	77.33 km/h (21.48 m/s)	2.61 J

Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or dangerous crushing to skin. 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 ends with a crack of the magnet. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
MP 20x8/4x5 / 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: Construction data (P_c)
MP 20x8/4x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	7 218 Mx	72.2 µWb
P_c Coefficient	0.31	Low (Flat)

Flux value emitted by the magnet pole. Key data in coil applications and motors. The P_c coefficient defines the working geometry.

Table 11: Submerged application
MP 20x8/4x5 / N38

Environment	Effective steel pull	Effect
Air (land)	6.65 kg	Standard
Water (riverbed)	7.61 kg (+0.96 kg Buoyancy gain)	+14.5%

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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.31

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 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.

Engineering data and GPSR

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: 030333-2025

Quick Unit Converter

Force (pull)

Newtons (N)

Pounds (lbs)

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The ring magnet with a hole MP 20x8/4x5 / N38 is created for permanent mounting, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. 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 20x8/4x5 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. 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 flexible washer under the screw head, which will cushion the stresses. 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 inside building use. For outdoor applications, we recommend choosing rubberized holders 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. Aesthetic mounting requires selecting the appropriate head size.

This model is characterized by dimensions Ø20x5 mm and a weight of 11.31 g. The key parameter here is the lifting capacity amounting to approximately 6.65 kg (force ~65.21 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 8/4 mm.

The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of Nd₂Fe₁₄B magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:

They retain magnetic properties for almost 10 years – the loss is just ~1% (based on simulations),
Neodymium magnets are distinguished by highly resistant to loss of magnetic properties caused by magnetic disturbances,
Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
Magnets have excellent magnetic induction on the active area,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
Thanks to versatility in forming and the ability to customize to specific needs,
Versatile presence in future technologies – they find application in mass storage devices, drive modules, medical equipment, and modern systems.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems

Disadvantages

Cons of neodymium magnets: weaknesses and usage proposals

Susceptibility to cracking 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 recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
Due to limitations in realizing nuts and complex shapes in magnets, we propose using cover - magnetic mechanism.
Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products are able to be problematic in diagnostics medical when they are in the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

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

Magnet power was defined for optimal configuration, taking into account:

on a block made of structural steel, perfectly concentrating the magnetic flux
whose thickness equals approx. 10 mm
with a plane free of scratches
under conditions of no distance (surface-to-surface)
for force acting at a right angle (in the magnet axis)
at ambient temperature room level

Determinants of practical lifting force of a magnet

In real-world applications, the real power depends on several key aspects, listed from crucial:

Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
Plate material – mild steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate reduces the holding force.

Precautions when working with neodymium magnets

GPS and phone interference

Note: neodymium magnets generate a field that interferes with precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

Life threat

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Fire risk

Machining of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Safe distance

Very strong magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Conscious usage

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, cease handling magnets and wear gloves.

Operating temperature

Keep cool. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Beware of splinters

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Physical harm

Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Product not for children

Adult use only. Tiny parts can be swallowed, causing severe trauma. Keep away from kids and pets.

Safety First! Details about hazards in the article: Safety of working with magnets.

MP 20x8/4x5 / N38 - ring magnet

Physical properties - MP 20x8/4x5 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the assembly - technical parameters

Table 1: Static force (force vs gap) - power drop MP 20x8/4x5 / N38

Table 2: Shear capacity (wall) MP 20x8/4x5 / N38

Table 3: Wall mounting (sliding) - vertical pull MP 20x8/4x5 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection MP 20x8/4x5 / N38

Table 5: Working in heat (material behavior) - resistance threshold MP 20x8/4x5 / N38

Table 6: Two magnets (attraction) - field collision MP 20x8/4x5 / N38

Table 7: Safety (HSE) (electronics) - warnings MP 20x8/4x5 / N38

Table 8: Impact energy (cracking risk) - collision effects MP 20x8/4x5 / N38

Table 9: Coating parameters (durability) MP 20x8/4x5 / N38

Table 10: Construction data (Pc) MP 20x8/4x5 / N38

Table 11: Submerged application MP 20x8/4x5 / N38

1. Wall mount (shear)

2. Steel thickness impact

3. Thermal stability

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

Material specification

Environmental data

Force (pull)

Magnetic Induction

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Pros and cons of Nd2Fe14B magnets.

Benefits

Disadvantages

Lifting parameters

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

Determinants of practical lifting force of a magnet

Precautions when working with neodymium magnets

GPS and phone interference

Life threat

Fire risk

Safe distance

Conscious usage

Nickel coating and allergies

Operating temperature

Beware of splinters

Physical harm

Product not for children

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs gap) - power drop
MP 20x8/4x5 / N38

Table 2: Shear capacity (wall)
MP 20x8/4x5 / N38

Table 3: Wall mounting (sliding) - vertical pull
MP 20x8/4x5 / N38

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 20x8/4x5 / N38

Table 5: Working in heat (material behavior) - resistance threshold
MP 20x8/4x5 / N38

Table 6: Two magnets (attraction) - field collision
MP 20x8/4x5 / N38

Table 7: Safety (HSE) (electronics) - warnings
MP 20x8/4x5 / N38

Table 8: Impact energy (cracking risk) - collision effects
MP 20x8/4x5 / N38

Table 9: Coating parameters (durability)
MP 20x8/4x5 / N38

Table 10: Construction data (P_c)
MP 20x8/4x5 / N38

Table 11: Submerged application
MP 20x8/4x5 / N38

Pros and cons of Nd₂Fe₁₄B magnets.