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

through hole magnetic holder

Catalog no 370484

GTIN/EAN: 5906301814948

Diameter Ø

42 mm [±1 mm]

Height

8.8 mm [±1 mm]

Weight

75.2 g

Magnetization Direction

↑ axial

Load capacity

55.00 kg / 539.37 N

Coating

[NiCuNi] Nickel

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29.89 ZŁ with VAT / pcs + price for transport

24.30 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Pick up the phone and ask +48 22 499 98 98 if you prefer let us know through contact form the contact section.
Strength along with structure of magnetic components can be calculated using our force calculator.

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

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

properties
properties values
Cat. no. 370484
GTIN/EAN 5906301814948
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 Ø 42 mm [±1 mm]
Height 8.8 mm [±1 mm]
Weight 75.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 55.00 kg / 539.37 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

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

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 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: 370484-2026
Measurement Calculator
Force (pull)
Field Strength
Insert data into any field, and the remaining fields will convert automatically.

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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.
We recommend manual tightening with feeling to not crush the magnetic ring. It is worth using a washer if the screw head is small to distribute pressure.
Model HH 42x8.8 [M6] / N38 has a holding force of approx. 55.00 kg on thick steel. It is a very efficient solution of small thickness, ensuring high power.
They serve as a base for holding metal elements, e.g., doors, flaps, covers, or tools. Great as mounting points in advertising and exhibition.
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.

Pros as well as cons of rare earth magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain full power for around 10 years – the loss is just ~1% (based on simulations),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • Thanks to the metallic finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of detailed forming as well as modifying to atypical applications,
  • Wide application in future technologies – they are used in hard drives, electromotive mechanisms, advanced medical instruments, and complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited ability of making threads in the magnet and complicated forms - recommended is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these devices can complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Highest magnetic holding force – what contributes to it?

The force parameter is a result of laboratory testing conducted under standard conditions:
  • using a plate made of mild steel, functioning as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • with total lack of distance (no coatings)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature room level

What influences lifting capacity in practice

During everyday use, the actual lifting capacity is determined by a number of factors, listed from most significant:
  • Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Steel grade – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Respect the power

Use magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their power.

Protect data

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Do not drill into magnets

Dust produced during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Impact on smartphones

Navigation devices and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Danger to the youngest

Adult use only. Tiny parts can be swallowed, causing serious injuries. Keep out of reach of children and animals.

Beware of splinters

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

Skin irritation risks

Some people have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling might lead to an allergic reaction. We suggest wear protective gloves.

Physical harm

Large magnets can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Heat warning

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Implant safety

Warning for patients: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

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