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Silver rectangular neodymium magnet block 40 by 40 by 20 mm

DIYMAG F404020 Neodymium Magnet 40x40x20mm

SKU CH-Y9DS-MSMZ5

A 40 by 40 by 20 millimetre N52 neodymium block magnet rated to 80°C for industrial lifting and holding tasks

  • Main colorSilver
  • Color when drySilver
  • Container type1
  • Item count1
  • Product subcategory52141500
  • Product typeMaterial Handling; Pulling & Lifting Equipment; industrial-r
  • N52 grade neodymium for maximum holding force
  • 40 x 40 x 20 mm block covers large contact area
  • Magnetised through 20 mm thickness with poles on flat faces
  • Operates up to 80 °C / 176 °F without loss
  • Single industrial lifting magnet ready for heavy-duty use

DIYMAG F404020 Neodymium Magnet Block

The DIYMAG F404020 is a single neodymium-iron-boron block magnet measuring 40mm by 40mm by 20mm. It is magnetised through the thickness with poles on the flat surfaces. The N52 grade material suits science, engineering and industrial lifting tasks. It is supplied new and individually packaged.

Thermal and Handling Limits

Maximum operating temperature is 80°C or 176°F; exceeding this risks permanent loss of magnetism. The brittle NdFeB material can fracture or splinter on impact, so gloves and protective glasses are advised during handling. No power draw or noise is produced in normal use.

Safety Distance and Accessories

The manufacturer recommends keeping at least three feet of distance from large magnets to avoid unintended attraction. No adhesives, coatings or mounting hardware are included in the package. The bare silver block requires user-supplied fixtures for installation.

How it compares

Measured against everything we stock in Glues, Tapes & Fasteners, at today’s prices. Recalculated every night.

Price $32.99
Pricier than about 90% of the 702 comparable items (median $13.99).

Specifications

Product
Brand nameDIYMAG
Product lineF404020 DIYMAG
Model nameF404020
Product typeMaterial Handling; Pulling & Lifting Equipment; industrial-rare-earth-magnets
Product colorSilver
Main colorSilver
Color when drySilver
In the box
Item count1
More details
Non-toxicNo

Questions about this item

How do I mount the 40x40x20mm N52 block and which pole face should contact the workpiece?

The magnet is magnetised through the 20mm thickness, so the poles sit on the two 40x40mm faces. Place one large face flat against the ferromagnetic surface; the opposite face becomes the active holding side.

What long-term degradation should I expect from the neodymium material?

The NdFeB alloy loses flux permanently if heated above 80°C. At room temperature the decay is negligible, but the brittle coating can chip on impact, exposing the material to corrosion.

At what point does the holding force drop off during continuous duty?

Sustained temperatures approaching 80°C / 176°F cause irreversible demagnetisation, which is the first hard limit under heavy or prolonged use.

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