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

through hole magnetic holder

Catalog no 370484

GTIN/EAN: 5906301814948

Load capacity 55.00 kg / 539.37 N
Diameter Ø
42 mm [±1 mm]
Height
8.8 mm [±1 mm]
Weight
75.2 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see parameters »

24.30 zł net / pcs

29.89 zł with VAT (23% VAT) / pcs

price for transport

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price from 30 pcs
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Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical parameters - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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

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%

Ecology and recycling (GPSR)

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
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Unlike the countersunk version, the hole can be straight (for a cylindrical head screw) or with a recess (depending on the model). The steel housing strengthens attraction force and protects the magnet from cracking.
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. This force is available with direct contact with metal.
They are commonly used in carpentry as strong furniture latches. Great as mounting points in advertising and exhibition.
The steel housing and magnet are covered with an anti-corrosion layer (nickel, zinc, or chrome). With constant contact with water or in rain, corrosion may appear on the housing.

Pros and cons of rare earth magnets.

Pros

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • Their strength is maintained, and after approximately ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under close interference source,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets create maximum magnetic induction on a their surface, which increases force concentration,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in designing and the capacity to modify to complex applications,
  • Huge importance in modern industrial fields – they are commonly used in mass storage devices, electric drive systems, precision medical tools, also technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: tips and applications.
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Additionally, tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Magnetic strength at its maximum – what affects it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:
  • with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a thickness no less than 10 mm
  • with a surface free of scratches
  • with zero gap (no paint)
  • under vertical force vector (90-degree angle)
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

In practice, the actual lifting capacity depends on several key aspects, presented from most significant:
  • Gap (between the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Base massiveness – too thin plate does not close the flux, causing part of the power to be lost into the air.
  • Chemical composition of the base – mild steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
Mechanical processing

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Crushing risk

Risk of injury: The attraction force is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Medical implants

Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Eye protection

Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.

Precision electronics

A strong magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a device to avoid breaking the sensors.

Maximum temperature

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. This process is irreversible.

Handling guide

Handle with care. Rare earth magnets act from a long distance and connect with huge force, often faster than you can react.

Do not give to children

Adult use only. Small elements can be swallowed, causing serious injuries. Store out of reach of children and animals.

Electronic devices

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Safety First! Details about risks in the article: Magnet Safety Guide.