20mm x 10mm x 4mm (4mm Double Hole) Block Countersunk Neodymium Magnet N42 (Pull 2.81KG)


These high-powered 20mm x 10mm x 4mm x (4mm x 4mm double hole) Neodymium Countersunk Magnets are very powerful and versatile. Perfect for drilling or fixing into place due to their countersunk hole, they are commonly used for DIY, crafts, woodworking, furniture making, manufacturing and science experiments. 

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Product Description

These high-powered 20mm x 10mm x 4mm x (4mm x 4mm double hole) Neodymium magnets have a countersunk hole that allows them to be drilled or fit into place. They are incredibly strong and commonly used in DIY, crafts, furniture design, fixings, kitchen design, lock mechanisms and science experiments. The Neodymium magnets are coated in Nickel, Copper and Boron to enhance longevity and prevent signs of corrosion. These magnets are designed with one hole that allows them to be easily fixed and drilled into surfaces that aren’t magnetic. 

Quality Assurance

Introducing our premium N42-grade 20mm x 10mm x 4mm x (4mm x 4mm double hole)  Neodymium Block Countersunk magnets, meticulously crafted to meet your diverse needs with unparalleled performance. These magnets boast a triple-layer coating of nickel-copper-nickel (Ni-Cu-Ni), ensuring maximum protection against corrosion, enhancing longevity, and maintaining a pristine appearance.

Our neodymium block countersunk magnets are manufactured to comply with REACH and RoHS standards, meaning they are free from harmful substances and environmentally safe. The Registration, Evaluation, Authorisation, and Restriction of Chemicals (REACH) regulation governs the production and usage of chemicals, while the Restriction of Hazardous Substances (RoHS) directive restricts the use of specific hazardous materials in electrical and electronic equipment. By adhering to these standards, we guarantee the safety and quality of our products.

We pride ourselves on delivering top-quality products to our customers. We have implemented an extensive quality check programme to ensure that our neodymium magnets pass the highest quality standards. Each magnet undergoes rigorous tests and inspections, providing reliable, powerful magnets that stand the test of time.

Neodymium is a naturally fragile metal that lacks the elasticity commonly found in other metals. Due to their inherent brittleness, handling neodymium magnets with care is crucial. Clashing two neodymium magnets together may cause them to crack or sustain damage. Always exercise caution when using and storing these powerful magnets to ensure optimal performance and longevity. Trust in our premium magnets' quality, performance, and reliability, expertly crafted to meet the most stringent UK and international standards.

Please remember, these countersunk magnets have the same magnetic pole and they will repel each other if two countersunk facing magnets are brought together. If you are magnetising towards a metal plate or other ferrous material, the magnet will magnetise towards it on both polarities. 

Technical Specifications 

  • Length 20mm
  • Width 10mm
  • Thickness 3mm
  • 4mm double countersunk hole
  • Neodymium Grade: N42
  • +/-0.1mm tolerance.
  • 2.81KG pull force
  • Triple coated (Ni-Cu-Ni)
  • 4mm countersunk screws necessary for drilling and fixing
  • SKU: MS0045

Looking for a different shape or size? Click here to view our full range of countersunk magnets.

Additional information

Weight N/A


5, 10, 20, 50, 100, 200, 500, 1000



Max Temperature





Width or Diameter




Countersunk Hole


Pull (KG)


Pull Force Range

2.5KG – 5KG

Max Surface Field (Gauss)


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