← previous
next →
Product available Ships today (order by 14:00) CO2 GPSR PPWR REACH

UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220403

GTIN/EAN: 5906301814221

5.00
Load capacity 68.00 kg / 666.85 N
Diameter Ø
48 mm [±1 mm]
cone dimension Ø
18x8.5 mm [±1 mm]
Height
11.5 mm [±1 mm]
Weight
125 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical parameters »

36.52 zł net / pcs

44.92 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
36.52 zł
44.92 zł
price from 10 pcs
31.04 zł
38.18 zł
price from 30 pcs
23.74 zł
29.20 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.

Order by 14:00 and we’ll ship today!

Technical data of the product - UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

Specification / characteristics - UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220403
GTIN/EAN 5906301814221
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 48 mm [±1 mm]
cone dimension Ø 18x8.5 mm [±1 mm]
Height 11.5 mm [±1 mm]
Weight 125 g
Magnetization Direction ↑ axial
Load capacity ~ ? 68.00 kg / 666.85 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 48x18x8.5x11.5 / N38 - conical magnetic holder
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: 220403-2026
Magnet Unit Converter

Pulling force

Magnetic Induction

Input a figure in just one slot to see the conversion for all other fields at once.

Check out more proposals

MW 18.9x10 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 18.9x10 / N38 - cylindrical magnet

11.07 zł brutto / pcs
MW 20x1.5 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 20x1.5 / N38 - cylindrical magnet

1.574 zł brutto / pcs
MW 16x9 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 16x9 / N38 - cylindrical magnet

7.36 zł brutto / pcs
SM 28x275 [2xM8] / N52 - magnetic separator
Product available Ships today (order by 14:00)

SM 28x275 [2xM8] / N52 - magnetic separator

873.30 zł brutto / pcs
Countersunk magnets are indispensable in carpentry, furniture making, and modeling as hidden closures. Thanks to the hole with a chamfer (conical), the screw head hides in the magnet, ensuring a flat contact surface. Model UMS 48x18x8.5x11.5 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.
Remember that neodymium breaks easily if the screw is tightened too hard. We recommend tightening manually with feeling (screwdriver), not an impact driver. Using too large a countersunk screw may cause the magnetic ring to crack.
For two magnets screwed with cones facing each other (faces) to attract, they must have different polarity. In our offer, we try to mark or pair holders if explicitly stated in the description. Mounting a magnet to a plate eliminates the problem of matching poles and is easier.
The declared capacity (e.g., 68.00 kg) refers to the perpendicular force needed to detach the magnet from thick steel. To increase friction and prevent sliding, it is worth sticking a piece of rubber or anti-slip tape on the magnet. Paint or veneer on metal also reduces effective attraction force.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. It is a more durable and safer solution in everyday use than a bare ring. A bare ring has a dispersed field on both sides but is weaker in point holding.

Pros as well as cons of neodymium magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • Their magnetic field is durable, and after around 10 years it drops only by ~1% (according to research),
  • They do not lose their magnetic properties even under strong external field,
  • In other words, due to the smooth layer of nickel, the element is aesthetically pleasing,
  • Magnetic induction on the working layer of the magnet turns out to be extremely intense,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of individual creating and adapting to specific conditions,
  • Universal use in modern technologies – they are used in hard drives, motor assemblies, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • 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.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Limited ability of producing nuts in the magnet and complicated forms - preferred is casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was defined for optimal configuration, assuming:
  • using a sheet made of mild steel, acting as a ideal flux conductor
  • whose thickness reaches at least 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

It is worth knowing that the working load may be lower influenced by the following factors, in order of importance:
  • Distance (between the magnet and the metal), as even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the load capacity.

H&S for magnets
Magnet fragility

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Threat to navigation

Note: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Danger to pacemakers

Individuals with a ICD should keep an absolute distance from magnets. The magnetism can stop the functioning of the implant.

Handling rules

Handle magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their force.

No play value

Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from kids and pets.

Fire warning

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Electronic hazard

Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Allergy Warning

Some people experience a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Frequent touching may cause skin redness. We strongly advise wear safety gloves.

Crushing risk

Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Demagnetization risk

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Danger! Want to know more? Check our post: Why are neodymium magnets dangerous?