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

Product available Ships today (order by 14:00)

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

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

magnetic holder external thread

Catalog no 190322

GTIN: 5906301813811

5.00

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

7.22 ZŁ with VAT / pcs + price for transport

5.87 ZŁ net + 23% VAT / pcs

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Pick up the phone and ask +48 22 499 98 98 alternatively let us know by means of our online form our website.
Lifting power along with form of magnets can be verified with our online calculation tool.

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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	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
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

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

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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

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 106	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10-6	°C^-1
Young's modulus	1.7 x 104	kg/mm²

Magnet Unit Converter

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Pounds (lbs)

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Induction (Gs)

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This type of holder has a protruding threaded stud (screw), making it ideal for mounting in through holes. Mounting consists of inserting the screw into the hole and securing with a nut (e.g., wing nut). They are commonly used in machine building, exhibition stands, lighting, and advertising.

Too strong tightening with a wrench can cause the stud to rotate in the cup or strip the thread. When assembling, use a torque wrench or tighten with feeling. The construction is durable and adapted to industrial conditions.

Above this temperature, the magnet may irreversibly lose some of its power. For furnaces, dryers, and powder coating shops, we recommend other types of magnets. Avoid mounting directly on hot engine or machine components.

Holders are equipped with standard metric threads (e.g., M4, M6, M8, M10). Stud length varies depending on the model (usually from 8 to 15 mm). It is a solid threaded connection, ready for use.

Yes, the steel housing (cup) focuses the magnetic field, significantly increasing attraction force on the active side. This force drops very quickly with increasing distance (air gap).

Pros as well as cons of neodymium magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:

They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
They maintain their magnetic properties even under strong external field,
By applying a lustrous layer of nickel, the element presents an aesthetic look,
Magnetic induction on the working part of the magnet turns out to be maximum,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
Thanks to flexibility in designing and the ability to modify to unusual requirements,
Universal use in advanced technology sectors – they are utilized in mass storage devices, electric drive systems, advanced medical instruments, also other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in compact constructions

Weaknesses

Cons of neodymium magnets: weaknesses and usage proposals

At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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
Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in producing threads and complex forms in magnets, we recommend using cover - magnetic mechanism.
Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force was defined for optimal configuration, assuming:

with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
whose thickness reaches at least 10 mm
with an ground contact surface
with zero gap (without impurities)
for force acting at a right angle (in the magnet axis)
at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, mainly (from most important):

Distance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
Load vector – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Chemical composition of the base – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and lifting capacity.
Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.

H&S for magnets

Phone sensors

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a smartphone to avoid breaking the sensors.

Bodily injuries

Large magnets can crush fingers in a fraction of a second. Never place your hand between two strong magnets.

Operating temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Electronic hazard

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Health Danger

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

Risk of cracking

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Metal Allergy

Studies show that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or select encased magnets.

Dust is flammable

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

Keep away from children

Strictly store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are life-threatening.

Respect the power

Use magnets consciously. Their powerful strength can surprise even professionals. Be vigilant and respect their power.

Important! More info about risks in the article: Magnet Safety Guide.

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

Need help making a decision?

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

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Magnet Pull Force

Magnetic Field

Other deals

MPL 15x3x6 / N38 - lamellar magnet

MW 38x12 / N38 - cylindrical magnet

MPL 25x15x2 / N38 - lamellar magnet

MW 5x2 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

Advantages

Weaknesses

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Magnet lifting force in use – key factors

Phone sensors

Bodily injuries

Operating temperature

Electronic hazard

Health Danger

Risk of cracking

Metal Allergy

Dust is flammable

Keep away from children

Respect the power

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C