- Craft / Ferrite -make your own
- Flexible - strip, paper, signs
- Whiteboard / Fridge Magnets
- Magnet Testing Equipment
- Neodymium Blocks
- Neodymium Disks / Rods
- Neodymium Cubes
- Neodymium Rings
- Neodymium Spheres
- Neodymium - Self Adhesive
- Neodymium N52 - High Grade
- Neodymium High Operating Temp
- AlNiCo (Alcomax)
- Samarium Cobalt
- Limescale Magnets
- Magnetic Toys
- Pot / Anchoring Magnets
- Special Offers
- Made In UK
- Non-Magnetic Items
- Other
AlNiCo5 4mm dia x 20mm rod magnets guitar pickups reed switch DIY MRO bulk packs
- £12.310
Technical Specifications
- Diameter: 4 mm (0.15")
- Thickness (Length): 20 mm (0.78")
- Axially Magnetised through the thickness so that one flat face is north, the other is south
- Weight: 0.93g
- Grade: Cast Alnico 5 / 5.4MGOe
- Coating: None
- Maximum Temp: 525°C / 977°F
- WARNINGS:
- Never allow like poles (south-south or north-north) to come into contact with each other because it will cause the magnet to be partially demagnetised.
- Cast AlNiCo magnets are brittle; do not allow them drop to a hard surface, they will break, crack, chip or shatter.
- Do not attempt to flex, they will snap.
These are ideal for use in some electric guitar pickups.
Alnico magnets are comprised of Aluminium (Al), Nickel (Ni) and Cobalt (Co) together with small amounts of Iron, Copper and, occasionally Titanium. Alnico magnets are one of the oldest members of the magnet family and have been in existence for approximately 50 years. They are not as strong as Neodymium or Samarium Cobalt magnets but they are very stable over a wide temperature range and have a high magnetic flux density.
Alnico rods are good electrical conductors because of the metallic composition. When rods (diameter smaller than thickness) are being used for open circuit applications the thickness should be approximately 5 times the diameter. However, because they are course grained they are hard and brittle and must not be drilled, conventionally machined or used as structural components.
Extra care must be taken with these magnets because they can be partially demagnetised by allowing like poles to come into contact.