Countersunk Neodymium Block Magnet 20 x 10 x 5 mm N45, North Pole

Countersunk Neodymium Block Magnet 20 x 10 x 5 mm N45, North Pole

The Countersunk Neodymium Block Magnet 20 x 10 x 5 mm (0.79" x 0.39" x 0.20") N45, North Pole is a neodymium (NdFeB) magnet in grade N45 with a nickel coating (Ni-Cu-Ni). It is a rectangular magnet with a countersunk hole of 4 mm (0.16"), so it can be screwed on flush with countersunk screws. It is magnetised through its 5 mm (0.20") thickness; the countersunk side is the north pole. Combine it with the South Pole version if two magnets have to attract each other face to face. Screw it onto wood, plastic or panels for cabinet and door catches, covers and panels, signage and displays, tool holders and jigs.

N45 is a high grade of neodymium that gives strong holding force for its size (grades N48 to N52 are stronger still). The holding force is highest when the magnet sits directly on a thick, flat steel plate. In practice the force is lower on thin or painted steel, on rough surfaces or with an air gap.

• Dimensions: 20 x 10 x 5 mm (0.79" x 0.39" x 0.20"), magnetised through the 5 mm (0.20") thickness, a countersunk hole of 4 mm (0.16")
• Countersink on the north pole
• Grade N45 neodymium (NdFeB) with nickel coating (Ni-Cu-Ni)
• Maximum operating temperature 80 °C (176 °F)

The nickel coating protects the magnet against corrosion in dry, indoor conditions. For damp or outdoor use, seal or shield the magnet.

Please handle with care: neodymium magnets are brittle and can chip or break if they snap together, and they can pinch fingers. Keep them away from children, pacemakers and sensitive electronics.