UMC 42x7/4x9 / N38 - cylindrical magnetic holder

Product available Ships tomorrow

UMC 42x7/4x9 / N38 - cylindrical magnetic holder

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

cylindrical magnetic holder

Catalog no 320411

GTIN/EAN: 5906301814672

Diameter

42 mm [±1 mm]

internal diameter Ø

7/4 mm [±1 mm]

Height

9 mm [±1 mm]

Weight

72 g

Load capacity

32.00 kg / 313.81 N

Coating

[NiCuNi] Nickel

product specifications »

29.99 ZŁ with VAT / pcs + price for transport

24.38 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

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Contact us by phone +48 888 99 98 98 alternatively get in touch using request form the contact section.
Lifting power as well as structure of neodymium magnets can be calculated on our magnetic calculator.

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Technical data - UMC 42x7/4x9 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 42x7/4x9 / N38 - cylindrical magnetic holder

properties

properties	values
Cat. no.	320411
GTIN/EAN	5906301814672
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	42 mm [±1 mm]
internal diameter Ø	7/4 mm [±1 mm]
Height	9 mm [±1 mm]
Weight	72 g
Load capacity ~ ?	32.00 kg / 313.81 N
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

Specification / characteristics UMC 42x7/4x9 / N38 - cylindrical 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

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

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%

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: 320411-2026

Measurement Calculator

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These are magnets in the shape of a rod in a brass or steel sleeve, ideal for embedding in deep sockets. Used where the magnet must be hidden deep in the material or precisely positioned.

It can also be glued or pressed (maintaining tolerance) into a prepared hole. It is a precise, durable solution enabling depth adjustment.

The thick, steel or brass housing (sleeve) effectively screens the magnetic field on the sides of the holder. It increases attraction force in the magnet axis and facilitates assembly in ferromagnetic blocks.

The steel housing provides excellent mechanical protection for the brittle magnet against impacts. Suitable for working in difficult workshop and industrial conditions.

These holders are produced with standard tolerance for industrial magnets (usually ±0.1 mm or h6). It is an industrial product, not a precise machine element, although the execution is careful.

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.

Advantages

Apart from their notable magnetism, neodymium magnets have these key benefits:

They do not lose power, even after around 10 years – the drop in strength is only ~1% (based on measurements),
They are resistant to demagnetization induced by external field influence,
Thanks to the shiny finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
Neodymium magnets deliver maximum magnetic induction on a their surface, which increases force concentration,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
Thanks to flexibility in constructing and the capacity to adapt to client solutions,
Versatile presence in electronics industry – they find application in hard drives, drive modules, precision medical tools, as well as complex engineering applications.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:

They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
Due to limitations in realizing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

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

The declared magnet strength concerns the limit force, measured under laboratory conditions, namely:

with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
possessing a massiveness of min. 10 mm to ensure full flux closure
with an ideally smooth touching surface
without any air gap between the magnet and steel
for force acting at a right angle (in the magnet axis)
in stable room temperature

Impact of factors on magnetic holding capacity in practice

In real-world applications, the actual holding force depends on many variables, ranked from the most important:

Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Chemical composition of the base – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets

This is not a toy

Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Store away from children and animals.

Magnet fragility

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets leads to them shattering into small pieces.

Implant safety

Warning for patients: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.

Conscious usage

Use magnets consciously. Their immense force can shock even experienced users. Stay alert and do not underestimate their force.

Flammability

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Hand protection

Pinching hazard: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Thermal limits

Avoid heat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Keep away from computers

Avoid bringing magnets near a wallet, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Avoid contact if allergic

Medical facts indicate that nickel (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact and choose encased magnets.

Compass and GPS

GPS units and smartphones are highly susceptible to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Caution! Need more info? Read our article: Are neodymium magnets dangerous?

UMC 42x7/4x9 / N38 - cylindrical magnetic holder

Technical data - UMC 42x7/4x9 / N38 - cylindrical magnetic holder

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Chemical composition

Environmental data

Force (pull)

Magnetic Field

Other offers

MW 4x4 / N38 - cylindrical magnet

UMC 60x9/5x15 / N38 - cylindrical magnetic holder

SMZR 32x225 / N52 - magnetic separator with handle

UI 17.5x5 [C310] / N38 - badge holder

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Cons

Pull force analysis

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

Impact of factors on magnetic holding capacity in practice

Safe handling of NdFeB magnets

This is not a toy

Magnet fragility

Implant safety

Conscious usage

Flammability

Hand protection

Thermal limits

Keep away from computers

Avoid contact if allergic

Compass and GPS

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.