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neodymium magnets

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Where to purchase very strong neodymium magnet? Magnetic holders in solid and airtight enclosure are ideally suited for use in difficult weather, including snow and rain read

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

through hole magnetic holder

Catalog no 370484

GTIN: 5906301814948

0

Diameter Ø [±0,1 mm]

42 mm

Height [±0,1 mm]

8.8 mm

Weight

75.2 g

Magnetization Direction

↑ axial

Load capacity

55 kg / 539.37 N

Coating

[NiCuNi] nickel

29.89 with VAT / pcs + price for transport

24.30 ZŁ net + 23% VAT / pcs

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HH 42x8.8 [M6] / N38 - through hole magnetic holder
Specification/characteristics HH 42x8.8 [M6] / N38 - through hole magnetic holder
properties
values
Cat. no.
370484
GTIN
5906301814948
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
42 mm [±0,1 mm]
Height
8.8 mm [±0,1 mm]
Weight
75.2 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
55 kg / 539.37 N
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

This construction allows solid screwing of the magnet to the substrate using a bolt or rivet. It is a more durable and stronger solution than a bare magnetic ring.
The magnet inside is brittle, so we advise against using impact drivers. Select a screw of appropriate diameter and head shape (cylindrical or conical, depending on model).
Model HH 42x8.8 [M6] / N38 has a holding force of approx. 55 kg on thick steel. This force is available with direct contact with metal.
They are commonly used in carpentry as strong furniture latches. Can be used to build jigs in the workshop or mount lighting.
The steel housing and magnet are covered with an anti-corrosion layer (nickel, zinc, or chrome). For outdoor applications, we recommend additional protection with varnish or choosing a rubberized version.

Strengths as well as weaknesses of rare earth magnets.

Besides their tremendous field intensity, neodymium magnets offer the following advantages:

  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
  • They possess excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • By covering with a shiny coating of gold, the element has an elegant look,
  • Magnetic induction on the top side of the magnet turns out to be very high,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in forming and the ability to customize to individual projects,
  • Fundamental importance in high-tech industry – they serve a role in magnetic memories, electric drive systems, diagnostic systems, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in small systems

Cons of neodymium magnets: application proposals

  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complex shapes in magnets, we propose using a housing - magnetic mount.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnetwhat it depends on?

The force parameter is a result of laboratory testing performed under the following configuration:

  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • with a thickness of at least 10 mm
  • with an polished touching surface
  • under conditions of no distance (metal-to-metal)
  • under vertical application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, including (from most important):

  • Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the power to be wasted to the other side.
  • Chemical composition of the base – mild steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet and the plate decreases the lifting capacity.

H&S for magnets

Hand protection

Large magnets can break fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Electronic devices

Avoid bringing magnets near a wallet, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Warning for allergy sufferers

Some people have a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching may cause dermatitis. We suggest wear protective gloves.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Life threat

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Fragile material

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them cracking into shards.

Precision electronics

Remember: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, tablet, and GPS.

Do not give to children

These products are not toys. Swallowing several magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and necessitates immediate surgery.

Handling guide

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

Maximum temperature

Do not overheat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).

Attention!

More info about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98