Neodymium Block Magnet - 20mm x 10mm x 4mm | Countersunk 4mm-8mm hole

Product code: 22023

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Neodymium Block Magnet - 20mm x 10mm x 4mm | Countersunk 4mm-8mm hole

Rated 4.8 out of 5
Based on 6 reviews
Product Code 22023
Pull Force* 3.5 kg approx.
Weight 9 gm
Style Rare earth Block with 4-8mm Countersunk hole
Gauss 3087
Grade N38
Tolerance ± 0.05mm
Coating NiCuNi (Nickel)
Direction of Magnetisation Axially magnetised
Dimensions Width:10mm, Height:4mm, Length:20mm
*Measured against up to 10mm mild steel.
Neodymium Block Magnet - 20mm x 10mm x 4mm | Countersunk 4mm-8mm hole

Neodymium Block Magnet Description:

These Neodymium Countersunk Magnets have a strong pull force and a countersunk hole in the centre, making them one of the most versatile magnets in our stock. Made from high-quality Rare Earth Neodymium magnetic material for maximum strength, this Neodymium magnet is in a block shape with a countersunk 4-8mm hole in the centre. It has a 20mm length, 10mm height and a 4mm thickness, as well as a pull force of 3.5kg.


Uses for our Countersunk Rare Earth Bar Magnets:

This Rare Earth Block Magnet is a great all-purpose magnetic tool for joining and holding due to its super-strong magnetic pull and the convenient countersunk hole in the centre of the block. Strong Neodymium Bar Magnets are easy to fasten or mount onto a surface or wall with the addition of a screw through the centre hole. This Neodymium Rare Earth Magnet is axially magnetised and can easily attach to a metal object or surface. The powerful and small magnet has an impressive pull force relative to its small size.

Neodymium Block Magnet - 20mm x 10mm x 4mm | Countersunk 4mm-8mm hole (22023)

Grade
N38 N/A
Max Operating Temperature °C
<=80 N/A
Remanence Br(T)
1.23-1.3 N/A
Remanence Br(kGs)
12.3-13 N/A
Coercivity bHc(kA/m)
>=859 N/A
Coercivity bHc(Oe)
>=10.8 N/A
Intrinsic Coercivity iHc(kA/m)
>=955 N/A
Intrinsic Coercivity iHc(Oe)
>=12 N/A
Max Energy Product(BH)max(KJ/m)
286-318 N/A
Max Energy Product(BH)max(MGOe)
36-40 N/A
Grade N38 N/A
Max Operating Temperature °C <=80 N/A
Remanence Br(T) 1.23-1.3 N/A
Remanence Br(kGs) 12.3-13 N/A
Coercivity bHc(kA/m) >=859 N/A
Coercivity bHc(Oe) >=10.8 N/A
Intrinsic Coercivity iHc(kA/m) >=955 N/A
Intrinsic Coercivity iHc(Oe) >=12 N/A
Max Energy Product(BH)max(KJ/m) 286-318 N/A
Max Energy Product(BH)max(MGOe) 36-40 N/A

NB: Ranges are indicative for product category, please check individual products for specic values within that range.

The most common coating for Neodymium magnets is Nickel + Copper + Nickel (Ni + Cu + Ni). This coating offers the magnet relatively good protection from corrosion and passive applications. If the magnet will be exposed to moisture or liquid then consider the use of an organic coating such as Epoxy. A hard wearing coating, Epoxy is suited to applications where the magnet will come under some friction or knocking.

Magnets are readily available in Blocks, Discs, Cylinders & Rings. AMF Magnetics specializes in the supply of short-run prototype magnets including Arc Segments, various magnetic orientations etc. If you need a magnet size that we don't carry in stock, submit a Design-a-Magnet enquiry for a quote on your custom magnet design.

Neodymium magnets are offered in several different grades. The first section N30-54 has an operating temperature of up to 80 degrees. Most of our stock only goes up to N38. The second section, denoted with the "M" prefix after the grade has an operating temperature 100 degrees. After this the grades are "H", "SH", "UH" & "EH". In order for the magnet to withstand a higher operating temperature, during production more of the raw material PrNd is incorporated as these elements have a naturally occurring resistance to high temperatures.

average rating 4.8 out of 5
Based on 6 reviews
  • 5 Stars
    5 Reviews
  • 4 Stars
    1 Review
  • 3 Stars
    0 Reviews
  • 2 Stars
    0 Reviews
  • 1 Star
    0 Reviews
100% of reviewers would recommend this product to a friend
6 Reviews
Reviewed by Martin C.
I recommend this product
Rated 5 out of 5
Review posted

Worked well

I used the block as one half of a magnetic latch for a tool box. The other half comprised three short lengths of fencing wire inserted end-on into the mating surface.

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Reviewed by Poppi
I recommend this product
Rated 5 out of 5
Review posted

Great product

The product was great and managed to get to me fairly quickly despite covid restrictions.

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Reviewed by tradie
I recommend this product
Rated 5 out of 5
Review posted

works well , but they are brittle .

Used these magnets to hold extra bits in my drill driver box .

They work great , but I broke the first one by tightening the screw with the impact driver , don't do this , tightened with a screwdriver no problem .

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Reviewed by Stephanie
I recommend this product
Rated 4 out of 5
Review posted

Good but .....

Magnets arrived very quickly but arrived with 2 cracked magnets in the centre of the pack. Attached the surviving magnets to the underside of a small key safe that can now solidly attach to the underneath of the car while parked.

AMF Reply:

Hi Stephanie, thank you for your feedback! Sorry to hear two magnets arrived cracked, we package all our magnets with a generous amount of bubblewrap to prevent any breakages during transit but if you'd like to send us email with a photo of the cracked magnets along with your invoice number we can arrange a replacement. Kind Regards, AMF Magnetics.

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Reviewed by Andrew M.
I recommend this product
Rated 5 out of 5
Review posted

Very prompt service

Everything was as described

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Neodymium Block Magnet - 20mm x 10mm x 4mm | Countersunk 4mm-8mm hole

Neodymium Block Magnet Description:

These Neodymium Countersunk Magnets have a strong pull force and a countersunk hole in the centre, making them one of the most versatile magnets in our stock. Made from high-quality Rare Earth Neodymium magnetic material for maximum strength, this Neodymium magnet is in a block shape with a countersunk 4-8mm hole in the centre. It has a 20mm length, 10mm height and a 4mm thickness, as well as a pull force of 3.5kg.


Uses for our Countersunk Rare Earth Bar Magnets:

This Rare Earth Block Magnet is a great all-purpose magnetic tool for joining and holding due to its super-strong magnetic pull and the convenient countersunk hole in the centre of the block. Strong Neodymium Bar Magnets are easy to fasten or mount onto a surface or wall with the addition of a screw through the centre hole. This Neodymium Rare Earth Magnet is axially magnetised and can easily attach to a metal object or surface. The powerful and small magnet has an impressive pull force relative to its small size.

Neodymium Block Magnet - 20mm x 10mm x 4mm | Countersunk 4mm-8mm hole (22023)

Grade
N38 N/A
Max Operating Temperature °C
<=80 N/A
Remanence Br(T)
1.23-1.3 N/A
Remanence Br(kGs)
12.3-13 N/A
Coercivity bHc(kA/m)
>=859 N/A
Coercivity bHc(Oe)
>=10.8 N/A
Intrinsic Coercivity iHc(kA/m)
>=955 N/A
Intrinsic Coercivity iHc(Oe)
>=12 N/A
Max Energy Product(BH)max(KJ/m)
286-318 N/A
Max Energy Product(BH)max(MGOe)
36-40 N/A
Grade N38 N/A
Max Operating Temperature °C <=80 N/A
Remanence Br(T) 1.23-1.3 N/A
Remanence Br(kGs) 12.3-13 N/A
Coercivity bHc(kA/m) >=859 N/A
Coercivity bHc(Oe) >=10.8 N/A
Intrinsic Coercivity iHc(kA/m) >=955 N/A
Intrinsic Coercivity iHc(Oe) >=12 N/A
Max Energy Product(BH)max(KJ/m) 286-318 N/A
Max Energy Product(BH)max(MGOe) 36-40 N/A

NB: Ranges are indicative for product category, please check individual products for specic values within that range.

The most common coating for Neodymium magnets is Nickel + Copper + Nickel (Ni + Cu + Ni). This coating offers the magnet relatively good protection from corrosion and passive applications. If the magnet will be exposed to moisture or liquid then consider the use of an organic coating such as Epoxy. A hard wearing coating, Epoxy is suited to applications where the magnet will come under some friction or knocking.

Magnets are readily available in Blocks, Discs, Cylinders & Rings. AMF Magnetics specializes in the supply of short-run prototype magnets including Arc Segments, various magnetic orientations etc. If you need a magnet size that we don't carry in stock, submit a Design-a-Magnet enquiry for a quote on your custom magnet design.

Neodymium magnets are offered in several different grades. The first section N30-54 has an operating temperature of up to 80 degrees. Most of our stock only goes up to N38. The second section, denoted with the "M" prefix after the grade has an operating temperature 100 degrees. After this the grades are "H", "SH", "UH" & "EH". In order for the magnet to withstand a higher operating temperature, during production more of the raw material PrNd is incorporated as these elements have a naturally occurring resistance to high temperatures.

average rating 4.8 out of 5
Based on 6 reviews
  • 5 Stars
    5 Reviews
  • 4 Stars
    1 Review
  • 3 Stars
    0 Reviews
  • 2 Stars
    0 Reviews
  • 1 Star
    0 Reviews
100% of reviewers would recommend this product to a friend
6 Reviews
Reviewed by Martin C.
I recommend this product
Rated 5 out of 5
Review posted

Worked well

I used the block as one half of a magnetic latch for a tool box. The other half comprised three short lengths of fencing wire inserted end-on into the mating surface.

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Was this helpful?
Reviewed by Poppi
I recommend this product
Rated 5 out of 5
Review posted

Great product

The product was great and managed to get to me fairly quickly despite covid restrictions.

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Was this helpful?
Reviewed by tradie
I recommend this product
Rated 5 out of 5
Review posted

works well , but they are brittle .

Used these magnets to hold extra bits in my drill driver box .

They work great , but I broke the first one by tightening the screw with the impact driver , don't do this , tightened with a screwdriver no problem .

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Was this helpful?
Reviewed by Stephanie
I recommend this product
Rated 4 out of 5
Review posted

Good but .....

Magnets arrived very quickly but arrived with 2 cracked magnets in the centre of the pack. Attached the surviving magnets to the underside of a small key safe that can now solidly attach to the underneath of the car while parked.

AMF Reply:

Hi Stephanie, thank you for your feedback! Sorry to hear two magnets arrived cracked, we package all our magnets with a generous amount of bubblewrap to prevent any breakages during transit but if you'd like to send us email with a photo of the cracked magnets along with your invoice number we can arrange a replacement. Kind Regards, AMF Magnetics.

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Reviewed by Andrew M.
I recommend this product
Rated 5 out of 5
Review posted

Very prompt service

Everything was as described

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