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

UMT 29x38 white / N38 - board holder

board holder

Catalog no 230283

GTIN/EAN: 5906301814351

5.00
Diameter Ø
29 mm [±1 mm]
Height
38 mm [±1 mm]
Weight
6 g
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see technical data »

5.54 zł net / pcs

6.81 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
5.54 zł
6.81 zł
price from 100 pcs
5.21 zł
6.41 zł
price from 150 pcs
4.88 zł
6.00 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!

Physical properties - UMT 29x38 white / N38 - board holder

Specification / characteristics - UMT 29x38 white / N38 - board holder

properties
properties values
Cat. no. 230283
GTIN/EAN 5906301814351
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 29 mm [±1 mm]
Height 38 mm [±1 mm]
Weight 6 g
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMT 29x38 white / N38 - board 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

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%

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: 230283-2026
Measurement Calculator

Force (pull)

Field Strength

Input a value in any box, to see all other values convert in real-time.

Other proposals

MW 3x6 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 3x6 / N38 - cylindrical magnet

0.295 zł brutto / pcs
MW 15x4 / N38 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 15x4 / N38 - cylindrical magnet

1.968 zł brutto / pcs
MPL 20x20x20 / N38 - lamellar magnet
Product available Ships today (order by 14:00)

MPL 20x20x20 / N38 - lamellar magnet

33.21 zł brutto / pcs
SM 28x125 [2xM8] / N52 - magnetic separator
Product available Ships today (order by 14:00)

SM 28x125 [2xM8] / N52 - magnetic separator

455.10 zł brutto / pcs
This shape makes operating a whiteboard convenient, fast, and does not break nails. Small size hides great power - one pin works better than a handful of regular magnets. They are aesthetic, colorful, and do not scratch the board surface thanks to a smooth base.
Despite inconspicuous size, one pin with a neodymium magnet can hold even 15-20 A4 paper sheets. They do not slide down under the weight of a single sheet like cheap advertising substitutes.
Pins are ideal for whiteboards, magnetic boards, and glass boards in offices and schools. You can use them for board games (as pawns) and educational games with children. Note: Special, even stronger neodymium magnets are needed for glass boards.
Although the magnet is tightly sealed in a plastic housing, the product is small and poses a swallowing risk. The plastic housing protects the magnet itself from breaking, increasing usage safety.
You can choose colors matching office decor, company logo, or child's preferences. Pins are made of durable plastic with vivid colors that do not fade.

Advantages and disadvantages of neodymium magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after around ten years it decreases only by ~1% (according to research),
  • They are extremely resistant to demagnetization induced by external field influence,
  • In other words, due to the reflective layer of silver, the element becomes visually attractive,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Considering the potential of flexible molding and customization to individualized solutions, NdFeB magnets can be produced in a broad palette of shapes and sizes, which amplifies use scope,
  • Key role in future technologies – they are used in computer drives, electric motors, precision medical tools, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

Characteristics of disadvantages of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in producing threads and complex shapes in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these magnets can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Highest magnetic holding force – what contributes to it?

Magnet power was defined for the most favorable conditions, including:
  • using a sheet made of mild steel, serving as a circuit closing element
  • whose transverse dimension reaches at least 10 mm
  • with a surface perfectly flat
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Holding efficiency is affected by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick plate does not close the flux, causing part of the flux to be escaped to the other side.
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Do not underestimate power

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Heat sensitivity

Do not overheat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Machining danger

Mechanical processing of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Compass and GPS

Be aware: rare earth magnets generate a field that interferes with precision electronics. Maintain a separation from your mobile, tablet, and GPS.

Metal Allergy

A percentage of the population suffer from a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Extended handling may cause skin redness. We recommend wear protective gloves.

Health Danger

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Crushing force

Risk of injury: The attraction force is so great that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

Risk of cracking

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

No play value

Adult use only. Tiny parts can be swallowed, leading to severe trauma. Store away from kids and pets.

Electronic hazard

Powerful magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

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