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neodymium magnets

We offer yellow color magnetic Nd2Fe14B - our store's offer. Practically all "magnets" in our store are in stock for immediate purchase (see the list). See the magnet price list for more details see the magnet price list

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MP 62x42x25 / N38 - ring magnet

ring magnet

Catalog no 030205

GTIN: 5906301812227

5

Diameter [±0,1 mm]

62 mm

internal diameter Ø [±0,1 mm]

42 mm

Height [±0,1 mm]

25 mm

Weight

117.81 g

Magnetization Direction

↑ axial

Load capacity

59.85 kg / 586.93 N

Magnetic Induction

85.46 mT

Coating

[NiCuNi] nickel

165.00 with VAT / pcs + price for transport

134.15 ZŁ net + 23% VAT / pcs

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MP 62x42x25 / N38 - ring magnet
Specification/characteristics MP 62x42x25 / N38 - ring magnet
properties
values
Cat. no.
030205
GTIN
5906301812227
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter
62 mm [±0,1 mm]
internal diameter Ø
42 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
117.81 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
59.85 kg / 586.93 N
Magnetic Induction ~ ?
85.46 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

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

Shopping tips

The ring magnet with a hole MP 62x42x25 / N38 is created for permanent mounting, where glue might fail or be insufficient. Mounting is clean and reversible, unlike gluing. This product with a force of 59.85 kg works great as a cabinet closure, speaker holder, or spacer element in devices.
This is a crucial issue when working with model MP 62x42x25 / 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.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 42 mm fits this model. 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.
The presented product is a ring magnet with dimensions Ø62 mm (outer diameter) and height 25 mm. The pulling force of this model is an impressive 59.85 kg, which translates to 586.93 N in newtons. The product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 42 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 rare earth magnets.

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

  • Their power is maintained, and after approximately ten years it decreases only by ~1% (according to research),
  • They have excellent resistance to magnetism drop as a result of external fields,
  • By covering with a shiny layer of gold, the element gains an aesthetic look,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Possibility of accurate shaping as well as modifying to atypical applications,
  • Universal use in innovative solutions – they are commonly used in magnetic memories, drive modules, diagnostic systems, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in miniature devices

Disadvantages of NdFeB magnets:

  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited possibility of producing threads in the magnet and complex forms - preferred is a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price is relatively high,

Optimal lifting capacity of a neodymium magnetwhat affects it?

The load parameter shown represents the peak performance, recorded under ideal test conditions, namely:

  • using a sheet made of low-carbon steel, serving as a circuit closing element
  • with a thickness of at least 10 mm
  • characterized by smoothness
  • with zero gap (no coatings)
  • under vertical application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

It is worth knowing that the application force will differ depending on the following factors, starting with the most relevant:

  • Space between surfaces – every millimeter of separation (caused e.g. by varnish 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 shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate lowers the load capacity.

Warnings

Permanent damage

Do not overheat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Magnetic media

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

Physical harm

Large magnets can break fingers instantly. Do not place your hand betwixt two strong magnets.

Powerful field

Use magnets consciously. Their immense force can surprise even professionals. Be vigilant and respect their force.

Beware of splinters

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Mechanical processing

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

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, cease working with magnets and use protective gear.

GPS Danger

A powerful magnetic field disrupts the operation of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to avoid breaking the sensors.

ICD Warning

Individuals with a pacemaker should keep an safe separation from magnets. The magnetism can stop the operation of the implant.

No play value

Only for adults. Small elements can be swallowed, causing severe trauma. Store away from children and animals.

Caution!

Need more info? Read our article: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98