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HH 32x7.8 [M5] / N38 - through hole magnetic holder

through hole magnetic holder

Catalog no 370483

GTIN/EAN: 5906301814931

Load capacity 27.00 kg / 264.78 N
Diameter Ø
32 mm [±1 mm]
Height
7.8 mm [±1 mm]
Weight
37.8 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product specifications »

14.60 zł net / pcs

17.96 zł with VAT (23% VAT) / 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 details - HH 32x7.8 [M5] / N38 - through hole magnetic holder

Specification / characteristics - HH 32x7.8 [M5] / N38 - through hole magnetic holder

properties
properties values
Cat. no. 370483
GTIN/EAN 5906301814931
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 32 mm [±1 mm]
Height 7.8 mm [±1 mm]
Weight 37.8 g
Magnetization Direction ↑ axial
Load capacity ~ ? 27.00 kg / 264.78 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics HH 32x7.8 [M5] / 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
Engineering data and GPSR

Chemical composition

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: 370483-2026
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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.
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.
Model HH 32x7.8 [M5] / N38 has a holding force of approx. 27.00 kg on thick steel. 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. With constant contact with water or in rain, corrosion may appear on the housing.

Pros and cons of rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their power is maintained, and after around 10 years it drops only by ~1% (according to research),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • Thanks to the shimmering finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in constructing and the ability to adapt to complex applications,
  • Significant place in innovative solutions – they are commonly used in magnetic memories, electric drive systems, medical devices, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these magnets can be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Information about lifting capacity is the result of a measurement for ideal contact conditions, assuming:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • whose thickness equals approx. 10 mm
  • with a plane cleaned and smooth
  • with total lack of distance (no coatings)
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Effective lifting capacity impacted by specific conditions, such as (from priority):
  • Distance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is pure iron steel. Stainless steels may attract less.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

Warnings
Do not underestimate power

Use magnets consciously. Their huge power can shock even experienced users. Be vigilant and respect their force.

Keep away from electronics

Note: neodymium magnets generate a field that confuses sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

Allergy Warning

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and choose encased magnets.

Threat to electronics

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

Fragile material

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Serious injuries

Danger of trauma: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

This is not a toy

Only for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Keep away from children and animals.

Fire risk

Dust created during cutting of magnets is flammable. Do not drill into magnets unless you are an expert.

Heat warning

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

Pacemakers

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

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