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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

check technical specifications »

24.30 zł net / pcs

29.89 zł with VAT (23% VAT) / pcs

price for transport

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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

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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 specification - 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 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
Technical specification and ecology

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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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.
Similarly to other neodymium magnets, caution should be exercised when tightening the screw. It is worth using a washer if the screw head is small to distribute pressure.
Thanks to this, the through-hole holder has much greater lifting capacity than the magnet alone of these dimensions. This force is available with direct contact with metal.
They serve as a base for holding metal elements, e.g., doors, flaps, covers, or tools. Thanks to flat construction, they do not take up much space and are discreet.
This protection shields against moisture in indoor conditions but is not 100% waterproof. For outdoor applications, we recommend additional protection with varnish or choosing a rubberized version.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their power is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • They have excellent resistance to magnetism drop as a result of external fields,
  • Thanks to the shimmering finish, the surface of nickel, gold, or silver gives an professional appearance,
  • Magnetic induction on the surface of the magnet turns out to be impressive,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise forming and modifying to complex needs,
  • Fundamental importance in electronics industry – they are used in data components, electric drive systems, advanced medical instruments, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in small systems

Limitations

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • 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.
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complex shapes in magnets, we propose using casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Magnetic strength at its maximum – what affects it?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:
  • using a plate made of mild steel, functioning as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • with a plane perfectly flat
  • without any clearance between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • in stable room temperature

Key elements affecting lifting force

Holding efficiency impacted by working environment parameters, including (from priority):
  • Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Heat sensitivity

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. Damage is permanent.

Hand protection

Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Product not for children

Product intended for adults. Small elements pose a choking risk, leading to intestinal necrosis. Store out of reach of children and animals.

Protect data

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Medical implants

Individuals with a heart stimulator should maintain an safe separation from magnets. The magnetism can stop the functioning of the implant.

Do not drill into magnets

Fire warning: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Nickel allergy

Certain individuals have a contact allergy to Ni, which is the common plating for NdFeB magnets. Frequent touching may cause an allergic reaction. We recommend use protective gloves.

Do not underestimate power

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Keep away from electronics

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Keep a separation from your phone, device, and GPS.

Magnets are brittle

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Clashing of two magnets will cause them shattering into shards.

Caution! Learn more about risks in the article: Magnet Safety Guide.