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UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190323

GTIN/EAN: 5906301813828

5.00
Load capacity 17.00 kg / 166.71 N
Diameter Ø
25 mm [±1 mm]
Height
17 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
25 g
Coating
[NiCuNi] Nickel
see parameters »

12.23 zł with VAT / pcs + price for transport

9.94 zł net + 23% VAT / pcs

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Technical - UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

Specification / characteristics - UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

properties
properties values
Cat. no. 190323
GTIN/EAN 5906301813828
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 25 mm [±1 mm]
Height 17 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 25 g
Load capacity ~ ? 17.00 kg / 166.71 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread
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

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%

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: 190323-2026
Measurement Calculator

Force (pull)

Magnetic Induction

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It is a ready-made mounting element that allows quick creation of a magnetic point. Just pass the thread through the hole in the element and tighten the nut on the other side. Used for mounting sensors, panels, plates, and exhibition elements.
The threaded stud is an integral part of the steel housing, but avoid overtightening the thread. When assembling, use a torque wrench or tighten with feeling. The magnet itself is protected by a steel cup and is very resistant to impact.
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. Avoid mounting directly on hot engine or machine components.
Holders are equipped with standard metric threads (e.g., M4, M6, M8, M10). Exact screw dimensions can be found in the product technical table. 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. It is a solution optimized for strong holding with direct contact, not attracting from afar.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after approximately 10 years it decreases only by ~1% (according to research),
  • They have excellent resistance to magnetic field loss due to external fields,
  • By applying a smooth coating of gold, the element gains an nice look,
  • Magnetic induction on the working layer of the magnet remains impressive,
  • Neodymium magnets are characterized by extremely 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 flexibility in designing and the ability to modify to client solutions,
  • Key role in modern industrial fields – they find application in data components, electromotive mechanisms, precision medical tools, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Highest magnetic holding force – what contributes to it?

The force parameter is a measurement result conducted under the following configuration:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • whose thickness reaches at least 10 mm
  • with a surface free of scratches
  • with direct contact (no coatings)
  • during detachment in a direction perpendicular to the plane
  • at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Bear in mind that the magnet holding may be lower influenced by elements below, in order of importance:
  • Clearance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Powerful field

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

Bodily injuries

Pinching hazard: The attraction force is so great that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

GPS Danger

Navigation devices and smartphones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Adults only

NdFeB magnets are not toys. Eating a few magnets may result in them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.

Fire risk

Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Risk of cracking

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them breaking into shards.

Skin irritation risks

Some people experience a contact allergy to Ni, which is the common plating for neodymium magnets. Frequent touching may cause dermatitis. We suggest use protective gloves.

Cards and drives

Do not bring magnets near a wallet, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Permanent damage

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Pacemakers

Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Important! Want to know more? Check our post: Are neodymium magnets dangerous?