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UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190332

GTIN/EAN: 5906301813859

5.00
Load capacity 66.00 kg / 647.24 N
Diameter Ø
42 mm [±1 mm]
Height
20 mm [±1 mm]
Height
9 mm [±1 mm]
Weight
80 g
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

check parameters »

27.61 zł net / pcs

33.96 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Quantity
Net
Gross
price from 1 pcs
27.61 zł
33.96 zł
price from 20 pcs
25.95 zł
31.92 zł
price from 30 pcs
24.30 zł
29.89 zł

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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Physical properties - UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

Specification / characteristics - UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

properties
properties values
Cat. no. 190332
GTIN/EAN 5906301813859
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 20 mm [±1 mm]
Height 9 mm [±1 mm]
Weight 80 g
Load capacity ~ ? 66.00 kg / 647.24 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGZ 42x20x9 [M8] 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

Material specification

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: 190332-2026
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A magnet with a built-in screw is great for screwing with a nut to housings, profiles, and flat bars. Thanks to this, you get a solid, magnetized mounting point without welding or gluing. 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. 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. Remember that even momentary overheating can weaken the holder.
We use standardized threads that fit typical nuts available in every store. 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. It is a solution optimized for strong holding with direct contact, not attracting from afar.

Advantages as well as disadvantages of rare earth magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly ten years – the loss is just ~1% (according to analyses),
  • Magnets effectively resist against demagnetization caused by ambient magnetic noise,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnetic induction on the working layer of the magnet is impressive,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of precise forming and adjusting to individual conditions,
  • Wide application in advanced technology sectors – they are commonly used in computer drives, electric drive systems, medical equipment, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complicated shapes - preferred is a housing - magnet mounting.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum lifting capacity of the magnet – what contributes to it?

The load parameter shown concerns the peak performance, recorded under laboratory conditions, specifically:
  • with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • with a plane perfectly flat
  • with zero gap (without impurities)
  • during detachment in a direction perpendicular to the mounting surface
  • at standard ambient temperature

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity results from a number of factors, listed from the most important:
  • Distance – the presence of foreign body (paint, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
  • Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

Warnings
Bodily injuries

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

Risk of cracking

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets will cause them cracking into shards.

Warning for allergy sufferers

Certain individuals suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching may cause dermatitis. We strongly advise use protective gloves.

Warning for heart patients

Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

GPS and phone interference

Note: rare earth magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your mobile, tablet, and navigation systems.

Product not for children

Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which poses a direct threat to life and requires urgent medical intervention.

Data carriers

Do not bring magnets near a purse, laptop, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Handling rules

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can move away.

Heat sensitivity

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Fire risk

Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Safety First! Details about hazards in the article: Safety of working with magnets.