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UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190322

GTIN/EAN: 5906301813811

5.00
Load capacity 9.00 kg / 88.26 N
Diameter Ø
20 mm [±1 mm]
Height
15 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
14 g
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical details »

5.87 zł net / pcs

7.22 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

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 specification of the product - UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

Specification / characteristics - UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

properties
properties values
Cat. no. 190322
GTIN/EAN 5906301813811
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 20 mm [±1 mm]
Height 15 mm [±1 mm]
Height 7 mm [±1 mm]
Weight 14 g
Load capacity ~ ? 9.00 kg / 88.26 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
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
Technical and environmental data

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%

Sustainability

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: 190322-2026
Measurement Calculator

Force (pull)

Field Strength

Input your value in just one field to see the conversion for all other fields right away.

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A magnet with a built-in screw is great for screwing with a nut to housings, profiles, and flat bars. Just pass the thread through the hole in the element and tighten the nut on the other side. They are commonly used in machine building, exhibition stands, lighting, and advertising.
The screw is solidly seated in the cup, however, moderation must be maintained when tightening the nut. We recommend using spring washers to avoid the need for forceful tightening. The construction is durable and adapted to industrial conditions.
Above this temperature, the magnet may irreversibly lose some of its power. We also offer holders made of ferrite magnets (resistant up to 200°C) or special high-temperature versions. Remember that even momentary overheating can weaken the holder.
Thread size (e.g., M6) is always given in the product name and technical specification. Ensure thread length is sufficient to pass through the hole in your material and tighten the nut. It is a solid threaded connection, ready for use.
Thanks to shielding the sides and top, all magnet power is directed downwards, giving higher capacity than a bare magnet. However, such a system works point-wise and requires direct contact with metal.

Pros as well as cons of rare earth magnets.

Benefits

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They retain magnetic properties for almost 10 years – the loss is just ~1% (in theory),
  • Neodymium magnets are extremely resistant to loss of magnetic properties caused by external field sources,
  • A magnet with a metallic gold surface is more attractive,
  • Magnets exhibit very high magnetic induction on the outer layer,
  • 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...
  • Due to the potential of flexible molding and adaptation to individualized projects, NdFeB magnets can be modeled in a wide range of shapes and sizes, which expands the range of possible applications,
  • Huge importance in electronics industry – they find application in hard drives, electromotive mechanisms, medical equipment, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We suggest cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what affects it?

Breakaway force was determined for optimal configuration, assuming:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension reaches at least 10 mm
  • with an polished touching surface
  • under conditions of no distance (metal-to-metal)
  • during pulling in a direction perpendicular to the mounting surface
  • at temperature room level

Lifting capacity in real conditions – factors

Holding efficiency impacted by specific conditions, including (from most important):
  • Gap (betwixt the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Angle of force application – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
Protective goggles

NdFeB magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them cracking into small pieces.

Impact on smartphones

Navigation devices and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Do not drill into magnets

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Crushing risk

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Heat sensitivity

Avoid heat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Product not for children

Always keep magnets out of reach of children. Choking hazard is significant, and the effects of magnets connecting inside the body are life-threatening.

Health Danger

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Cards and drives

Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Conscious usage

Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Metal Allergy

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop working with magnets and use protective gear.

Important! More info about hazards in the article: Safety of working with magnets.