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MP 32x16x3 / 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 030198

GTIN: 5906301812159

5.00

Diameter

32 mm [±0,1 mm]

internal diameter Ø

16 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

13.57 g

Magnetization Direction

↑ axial

Load capacity

1.88 kg / 18.49 N

Magnetic Induction

103.36 mT

Coating

[NiCuNi] Nickel

5.24 ZŁ with VAT / pcs + price for transport

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MP 32x16x3 / N38 - ring magnet

Specification / characteristics MP 32x16x3 / N38 - ring magnet

properties

properties	values
Cat. no.	030198
GTIN	5906301812159
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	32 mm [±0,1 mm]
internal diameter Ø	16 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	13.57 g
Magnetization Direction	↑ axial
Load capacity ~ ?	1.88 kg / 18.49 N
Magnetic Induction ~ ?	103.36 mT
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 32x16x3 / N38 - ring magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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 106	°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

These information are the outcome of a physical calculation. Values were calculated on models for the material NdFeB. Real-world conditions might slightly deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - interaction chart
MP 32x16x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5552 Gs 555.2 mT	1.88 kg / 1880.0 g 18.4 N	safe
1 mm	5202 Gs 520.2 mT	1.65 kg / 1650.1 g 16.2 N	safe
2 mm	4850 Gs 485.0 mT	1.43 kg / 1434.4 g 14.1 N	safe
5 mm	3849 Gs 384.9 mT	0.90 kg / 903.3 g 8.9 N	safe
10 mm	2513 Gs 251.3 mT	0.39 kg / 385.1 g 3.8 N	safe
15 mm	1633 Gs 163.3 mT	0.16 kg / 162.6 g 1.6 N	safe
20 mm	1087 Gs 108.7 mT	0.07 kg / 72.1 g 0.7 N	safe
30 mm	535 Gs 53.5 mT	0.02 kg / 17.4 g 0.2 N	safe
50 mm	181 Gs 18.1 mT	0.00 kg / 2.0 g 0.0 N	safe

Grip strength drops significantly per each millimeter of spacing. Note that every additional insulation layer (e.g., dirt, paint, rust) significantly weakens the grip. Magnets operate most effectively during direct contact; air break drastically cuts the power. Analyze how flashily the parameters fall, when the product does not touch tightly to the metal substrate. When planning the arrangement, avoid additional spacers.

Table 2: Vertical assembly (shearing) - vertical pull
MP 32x16x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.56 kg / 564.0 g 5.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.38 kg / 376.0 g 3.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.19 kg / 188.0 g 1.8 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.94 kg / 940.0 g 9.2 N

When hanging a holder on a upright plane (e.g., a car body), it will only hold just about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that holders slip faster than they detach. Want to create a hanger? Note that the shear force is much weaker than the perpendicular breakaway 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 3: Material efficiency (saturation) - power losses
MP 32x16x3 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.19 kg / 188.0 g 1.8 N
1 mm	25%	0.47 kg / 470.0 g 4.6 N
2 mm	50%	0.94 kg / 940.0 g 9.2 N
5 mm	100%	1.88 kg / 1880.0 g 18.4 N
10 mm	100%	1.88 kg / 1880.0 g 18.4 N

A thin sheet cannot absorb the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To squeeze 100% of this neodymium's power, you need a suitably thick element of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the magnet works worse. We recommend selecting the steel cross-section from these parameters.

Table 4: Working in heat (stability) - resistance threshold
MP 32x16x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	1.88 kg / 1880.0 g 18.4 N	OK
40 °C	-2.2%	1.84 kg / 1838.6 g 18.0 N	OK
60 °C	-4.4%	1.80 kg / 1797.3 g 17.6 N	OK
80 °C	-6.6%	1.76 kg / 1755.9 g 17.2 N
100 °C	-28.8%	1.34 kg / 1338.6 g 13.1 N

Classic neodymiums change their properties parameters past the thermal threshold. Avoid high temperatures – high temperature can permanently damage this product. With every degree above norm, the neodymium's power briefly lowers. Do not use this product close to ovens exceeding its safe range. Ignoring the limit will lead to irreversible degradation of magnetic properties.

Table 5: Magnet-Magnet interaction (repulsion) - forces in the system
MP 32x16x3 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	2.82 kg / 2820.0 g 27.7 N	N/A
2 mm	2.15 kg / 2145.0 g 21.0 N	2.00 kg / 2002.0 g 19.6 N
5 mm	1.35 kg / 1350.0 g 13.2 N	1.26 kg / 1260.0 g 12.4 N
10 mm	0.59 kg / 585.0 g 5.7 N	0.55 kg / 546.0 g 5.4 N
20 mm	0.11 kg / 105.0 g 1.0 N	0.10 kg / 98.0 g 1.0 N
50 mm	0.00 kg / 0.0 g 0.0 N	0.00 kg / 0.0 g 0.0 N

Two magnetic products interact from a wider radius than a magnet and steel combination. The setup of two magnets generates a stronger field and a wider radius of performance. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still significant.

Table 6: Hazards (implants) - warnings
MP 32x16x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	20.5 cm
Hearing aid	10 Gs (1.0 mT)	16.0 cm
Timepiece	20 Gs (2.0 mT)	12.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	9.5 cm
Remote	50 Gs (5.0 mT)	9.0 cm
Payment card	400 Gs (40.0 mT)	3.5 cm
HDD hard drive	600 Gs (60.0 mT)	3.0 cm

Extremely neodym field poses a serious hazard to electronics as well as pacemakers. These magnets produce a field that destroys function of sensitive medical devices. Be aware: the unseen radiation acts through matter and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 7: Impact energy (kinetic energy) - collision effects
MP 32x16x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	13.30 km/h (3.70 m/s)	0.09 J
30 mm	20.68 km/h (5.74 m/s)	0.22 J
50 mm	26.56 km/h (7.38 m/s)	0.37 J
100 mm	37.54 km/h (10.43 m/s)	0.74 J

Neodymium magnets are delicate – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or painful pinches to skin. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when working with powerful specimens.

Table 8: Corrosion resistance
MP 32x16x3 / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 9: Physics of underwater searching
MP 32x16x3 / N38

Environment	Effective steel pull	Effect
Air (land)	1.88 kg	Standard
Water (riverbed)	2.15 kg (+0.27 kg Buoyancy gain)	+14.5%

Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.

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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. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. This product with a force of 1.88 kg works great as a door latch, speaker holder, or spacer element in devices.

This is a crucial issue when working with model MP 32x16x3 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. One turn too many can destroy the magnet, so do it slowly. 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 does not ensure full waterproofing. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.

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 Ø32 mm (outer diameter) and height 3 mm. The key parameter here is the holding force amounting to approximately 1.88 kg (force ~18.49 N). The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 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 and cons of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

They do not lose magnetism, even during approximately ten years – the decrease in power is only ~1% (theoretically),
They show high resistance to demagnetization induced by presence of other magnetic fields,
Thanks to the smooth finish, the surface of nickel, gold-plated, or silver-plated gives an professional appearance,
Neodymium magnets generate maximum magnetic induction on a contact point, which ensures high operational 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...
Due to the ability of accurate forming and customization to individualized projects, magnetic components can be created in a variety of shapes and sizes, which makes them more universal,
Huge importance in modern technologies – they serve a role in magnetic memories, electromotive mechanisms, medical devices, as well as other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems

Disadvantages of neodymium magnets:

Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their 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 rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
Limited possibility of making nuts in the magnet and complicated forms - recommended is a housing - mounting mechanism.
Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Additionally, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
Due to complex production process, their price is higher than average,

Maximum lifting capacity of the magnet – what contributes to it?

Holding force of 1.88 kg is a theoretical maximum value performed under specific, ideal conditions:

on a block made of mild steel, optimally conducting the magnetic flux
possessing a massiveness of at least 10 mm to avoid saturation
with an ground touching surface
under conditions of gap-free contact (metal-to-metal)
under vertical force direction (90-degree angle)
at room temperature

Lifting capacity in practice – influencing factors

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

Distance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap {between} the magnet and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets

Hand protection

Danger of trauma: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Protect data

Data protection: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Do not give to children

These products are not suitable for play. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which poses a severe health hazard and necessitates immediate surgery.

Allergic reactions

A percentage of the population have a contact allergy to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching may cause dermatitis. We recommend use safety gloves.

Health Danger

For implant holders: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or request help to handle the magnets.

Mechanical processing

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Compass and GPS

An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Keep magnets close to a smartphone to prevent damaging the sensors.

Shattering risk

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Handling rules

Use magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their power.

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and strength.

Caution!

Need more info? Read our article: Are neodymium magnets dangerous?

MP 32x16x3 / N38 - ring magnet

MP 32x16x3 / N38 - ring magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the magnet - technical parameters

Other offers

HH 42x8.8 [M6] / N38 - through hole magnetic holder

AM ucho [M12] - magnetic accessories

UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

MPL 17x17x3 / N38 - lamellar magnet

Pros and cons of neodymium magnets.

Maximum lifting capacity of the magnet – what contributes to it?

Lifting capacity in practice – influencing factors

Safety rules for work with neodymium magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C