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MP 24x16x2 / 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 030495

GTIN/EAN: 5906301812364

5.00

Diameter

24 mm [±0,1 mm]

internal diameter Ø

16 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

3.77 g

Magnetization Direction

↑ axial

Load capacity

0.94 kg / 9.22 N

Magnetic Induction

101.91 mT / 1019 Gs

Coating

[NiCuNi] Nickel

3.69 ZŁ with VAT / pcs + price for transport

3.00 ZŁ net + 23% VAT / pcs

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MP 24x16x2 / N38 - ring magnet

Specification / characteristics MP 24x16x2 / N38 - ring magnet

properties

properties	values
Cat. no.	030495
GTIN/EAN	5906301812364
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	24 mm [±0,1 mm]
internal diameter Ø	16 mm [±0,1 mm]
Height	2 mm [±0,1 mm]
Weight	3.77 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.94 kg / 9.22 N
Magnetic Induction ~ ?	101.91 mT / 1019 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 24x16x2 / 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 modeling of the product - data

Presented data represent the outcome of a engineering analysis. Values are based on models for the class Nd₂Fe₁₄B. Operational parameters may differ. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MP 24x16x2 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5807 Gs 580.7 mT	0.94 kg / 940.0 g 9.2 N	weak grip
1 mm	5318 Gs 531.8 mT	0.79 kg / 788.4 g 7.7 N	weak grip
2 mm	4833 Gs 483.3 mT	0.65 kg / 651.1 g 6.4 N	weak grip
3 mm	4366 Gs 436.6 mT	0.53 kg / 531.5 g 5.2 N	weak grip
5 mm	3517 Gs 351.7 mT	0.34 kg / 344.9 g 3.4 N	weak grip
10 mm	1995 Gs 199.5 mT	0.11 kg / 111.0 g 1.1 N	weak grip
15 mm	1168 Gs 116.8 mT	0.04 kg / 38.0 g 0.4 N	weak grip
20 mm	727 Gs 72.7 mT	0.01 kg / 14.7 g 0.1 N	weak grip
30 mm	332 Gs 33.2 mT	0.00 kg / 3.1 g 0.0 N	weak grip
50 mm	106 Gs 10.6 mT	0.00 kg / 0.3 g 0.0 N	weak grip

Grip strength drops sharply with every subsequent millimeter of distance. Remember that even a microscopic distance (e.g., dirt, paint, veneer) noticeably reduces the pull force. Magnetic products operate most effectively during direct contact; distance kills the force. Analyze how flashily the load capacity drop, when the magnet does not touch directly to the steel surface. When planning the assembly, eliminate redundant distances.

Table 2: Slippage force (vertical surface)
MP 24x16x2 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.19 kg / 188.0 g 1.8 N
1 mm	Stal (~0.2)	0.16 kg / 158.0 g 1.5 N
2 mm	Stal (~0.2)	0.13 kg / 130.0 g 1.3 N
3 mm	Stal (~0.2)	0.11 kg / 106.0 g 1.0 N
5 mm	Stal (~0.2)	0.07 kg / 68.0 g 0.7 N
10 mm	Stal (~0.2)	0.02 kg / 22.0 g 0.2 N
15 mm	Stal (~0.2)	0.01 kg / 8.0 g 0.1 N
20 mm	Stal (~0.2)	0.00 kg / 2.0 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

This section calculates the approximate weight limit necessary to initiate the slippage of the magnet vertically on a vertical steel wall (assuming standard friction coefficient). This parameter is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MP 24x16x2 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.28 kg / 282.0 g 2.8 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.19 kg / 188.0 g 1.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.09 kg / 94.0 g 0.9 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.47 kg / 470.0 g 4.6 N

When hanging a element on a upright plane (e.g., a fridge), it will only hold barely about 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that magnets slip faster than they pop off the substrate. Designing a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will slide down under a significantly smaller load. Application of an anti-slip pad can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MP 24x16x2 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.09 kg / 94.0 g 0.9 N
1 mm	25%	0.24 kg / 235.0 g 2.3 N
2 mm	50%	0.47 kg / 470.0 g 4.6 N
5 mm	100%	0.94 kg / 940.0 g 9.2 N
10 mm	100%	0.94 kg / 940.0 g 9.2 N

A thin sheet is unable to conduct the entire magnetic field, which squanders power of the holder. If you install a neodymium to a thin surface, the magnetism will pass right through and the holding will be smaller. To squeeze full efficiency of this neodymium's power, you need a suitably thick backing of metal. The saturation phenomenon means that on thin elements (e.g., thin profiles), the product works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MP 24x16x2 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.94 kg / 940.0 g 9.2 N	OK
40 °C	-2.2%	0.92 kg / 919.3 g 9.0 N	OK
60 °C	-4.4%	0.90 kg / 898.6 g 8.8 N	OK
80 °C	-6.6%	0.88 kg / 878.0 g 8.6 N
100 °C	-28.8%	0.67 kg / 669.3 g 6.6 N

Classic neodymiums lose parameters past the thermal threshold. Protect against heat – excessive heat can irreversibly damage this product. As the temperature rises, the neodymium's power briefly drops. Do not use this magnet near heat sources higher than its safe range. Ignoring the limit will lead to permanent loss of magnetism.

*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MP 24x16x2 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	79.38 kg / 79384 g 778.8 N 6 091 Gs	N/A
1 mm	72.89 kg / 72893 g 715.1 N 11 129 Gs	65.60 kg / 65603 g 643.6 N ~0 Gs
2 mm	66.58 kg / 66578 g 653.1 N 10 636 Gs	59.92 kg / 59920 g 587.8 N ~0 Gs
3 mm	60.60 kg / 60602 g 594.5 N 10 147 Gs	54.54 kg / 54542 g 535.1 N ~0 Gs
5 mm	49.75 kg / 49745 g 488.0 N 9 194 Gs	44.77 kg / 44771 g 439.2 N ~0 Gs
10 mm	29.13 kg / 29127 g 285.7 N 7 035 Gs	26.21 kg / 26215 g 257.2 N ~0 Gs
20 mm	9.37 kg / 9374 g 92.0 N 3 991 Gs	8.44 kg / 8437 g 82.8 N ~0 Gs
50 mm	0.54 kg / 540 g 5.3 N 958 Gs	0.49 kg / 486 g 4.8 N ~0 Gs

Two magnets interact from a wider radius than a magnet and sheet setup. The setup of two magnets produces a massive flux and a wider radius of operation. Designing a strong closure? Utilize two neodymiums instead of one magnet and a steel. Be careful that when attracting two neodymiums, the impact force is massive. The repulsion force is a bit weaker than the attraction, but still impressive.
*Flux density between like poles is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).

Table 7: Hazards (implants) - warnings
MP 24x16x2 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	16.5 cm
Hearing aid	10 Gs (1.0 mT)	13.0 cm
Mechanical watch	20 Gs (2.0 mT)	10.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	7.5 cm
Remote	50 Gs (5.0 mT)	7.0 cm
Payment card	400 Gs (40.0 mT)	3.0 cm
HDD hard drive	600 Gs (60.0 mT)	2.5 cm

A strong magnetic field poses a serious hazard to electronic devices as well as medical implants. These neodymiums produce a field that destroys function of sensitive medical devices. Notice: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MP 24x16x2 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	17.06 km/h (4.74 m/s)	0.04 J
30 mm	27.64 km/h (7.68 m/s)	0.11 J
50 mm	35.62 km/h (9.89 m/s)	0.18 J
100 mm	50.36 km/h (13.99 m/s)	0.37 J

Magnetic elements are delicate – a violent impact against metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the magnet. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
MP 24x16x2 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MP 24x16x2 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	23 520 Mx	235.2 µWb
P_c Coefficient	1.04	High (Stable)

Flux value emitted by the pole surface. Essential parameter in coil applications as well as sensors. The P_c coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
MP 24x16x2 / N38

Environment	Effective steel pull	Effect
Air (land)	0.94 kg	Standard
Water (riverbed)	1.08 kg (+0.14 kg Buoyancy gain)	+14.5%

Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Vertical hold

*Caution: On a vertical wall, the magnet retains merely ~20% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Heat tolerance

*For N38 grade, 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) = 1.04

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.

Technical and environmental data

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: 030495-2025

Measurement Calculator

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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. This product with a force of 0.94 kg works great as a door latch, speaker holder, or mounting element in devices.

This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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 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. 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. Aesthetic mounting requires selecting the appropriate head size.

The presented product is a ring magnet with dimensions Ø24 mm (outer diameter) and height 2 mm. The pulling force of this model is an impressive 0.94 kg, which translates to 9.22 N in newtons. The mounting hole diameter is precisely 16 mm.

The poles are located on the planes with holes, not on the sides of the ring. 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.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:

Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (according to research),
Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by external interference,
The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
They are known for high magnetic induction at the operating surface, which affects their effectiveness,
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...
Considering the option of accurate forming and customization to unique needs, neodymium magnets can be manufactured in a wide range of shapes and sizes, which increases their versatility,
Huge importance in modern technologies – they are commonly used in HDD drives, electric drive systems, diagnostic systems, and industrial machines.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:

At very strong impacts they can break, therefore we recommend 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 suffer a drop in force. Often, when the temperature exceeds 80°C, their strength 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
Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
Limited ability of creating nuts in the magnet and complex shapes - preferred is a housing - magnetic holder.
Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small components of these products can disrupt the diagnostic process medical after entering the body.
Due to expensive raw materials, their price is relatively high,

Pull force analysis

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

Information about lifting capacity was determined for ideal contact conditions, assuming:

on a base made of mild steel, optimally conducting the magnetic flux
with a thickness minimum 10 mm
characterized by smoothness
with zero gap (without impurities)
during detachment in a direction perpendicular to the plane
at standard ambient temperature

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity is determined by many variables, listed from most significant:

Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be wasted to the other side.
Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets

Dust explosion hazard

Dust generated during machining of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Skin irritation risks

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness appears, cease handling magnets and use protective gear.

Magnetic media

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

Do not overheat magnets

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Respect the power

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Adults only

Absolutely store magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are tragic.

Phone sensors

Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Danger to pacemakers

Warning for patients: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Pinching danger

Pinching hazard: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Fragile material

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.

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

MP 24x16x2 / N38 - ring magnet

Need help making a decision?

MP 24x16x2 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering modeling of the product - data

1. Vertical hold

2. Plate thickness effect

3. Heat tolerance

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

Elemental analysis

Sustainability

Magnet pull force

Field Strength

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Pros as well as cons of Nd2Fe14B magnets.

Advantages

Disadvantages

Pull force analysis

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

Practical lifting capacity: influencing factors

Dust explosion hazard

Skin irritation risks

Magnetic media

Do not overheat magnets

Respect the power

Adults only

Phone sensors

Danger to pacemakers

Pinching danger

Fragile material

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros as well as cons of Nd₂Fe₁₄B magnets.