Magnet Types & Sizes

Neodymium Iron Boron Magnets (NdFeB)

Common Name Rare earth (or) Neo’s
Released onto the market 1983
Magnetic output Very high strength to cost ratio
Resistance to demagnetisation Very high
Relative cost Medium
High temperature tolerance Poor (Although high temp grades are available)
Corrosion resistance Poor
Surface finish Can be plated in a range of finishes
Physical characteristics Very hard and brittle
Workability Extremely difficult to machine or drill
Uses Widely used throughout many industries

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Neodymium Round Magnets

Diameter
Thickness
Plating
3mm
x
1mm
Nickel
3mm
x
2mm
Nickel
3mm
x
4mm
Nickel
3mm
x
10mm
Nickel
4mm
x
2mm
Nickel
4mm
x
5mm
Nickel
4mm
x
10mm
Nickel
4mm
x
20mm
Nickel
4.75mm
x
1.5mm
Nickel
5mm
x
4mm
Nickel
6mm
x
1mm
Nickel
6mm
x
2mm
Nickel
6mm
x
2mm
Gold
6mm
x
4mm
Nickel
6mm
x
5mm
Nickel
6mm
x
6mm
Nickel
6mm
x
25mm
Nickel
6.35mm
x
5.08mm
Nickel
6.35mm
x
6.35mm
Nickel
7mm
x
3mm
Nickel
8mm
x
5mm
Nickel
8mm
x
25mm
Nickel
10mm
x
1.5mm
Nickel
10mm
x
3mm
Nickel
10mm
x
5mm
Nickel
10mm
x
10mm
Nickel
10mm
x
12mm
Nickel
10mm
x
16mm
Nickel
10mm
x
50mm
Nickel
12mm
x
1mm
Nickel
12mm
x
5mm
Nickel
12mm
x
10mm
Nickel
12mm
x
20mm
Nickel
12.5mm
x
4mm
Nickel
15mm
x
1.5mm
Nickel
15mm
x
3mm
Nickel
15mm
x
5mm
Nickel
15mm
x
7mm
Nickel
15mm
x
10mm
Nickel
20mm
x
3mm
Nickel
20mm
x
5mm
Nickel
20mm
x
10mm
Nickel
22mm
x
10mm
Nickel
22mm
x
15mm
Nickel
22mm
x
25.4mm
Nickel
25mm
x
2.5mm
Nickel
25mm
x
5mm
Nickel
25mm
x
20mm
Nickel
25.4mm
x
12.7mm
Nickel
30mm
x
10mm
Nickel
50mm
x
6mm
Nickel
50.8mm
x
12.7mm
Nickel
50.8mm
x
50.8mm
Nickel
75mm
x
15mm
Nickel
101.6mm
x
25.4mm
Nickel

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Neodymium Ring Magnets

Outside Diameter Inside Diameter Thickness Plating
6mm
x
2mm
x
2mm
Nickel
10mm
x
3.2mm
x
3mm C/ Sunk
Nickel
12.5mm
x
6mm
x
3mm
Nickel
15mm
x
4.2mm
x
5mm C/ Sunk
Nickel
14mm
x
7mm
x
5mm
Nickel
20mm
x
10mm
x
8mm
Nickel
25.4mm
x
6.35mm
x
12.7mm
Nickel
30mm
x
12mm
x
5mm
Nickel
35mm
x
16mm
x
10mm
Nickel
72mm
x
32.5mm
x
13mm
Nickel

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Neodymium Block Magnets

Length Width Thickness Plating
10mm
x
5mm
x
4mm
Nickel
11mm
x
3mm
x
1.8mm
Nickel
12.5mm
x
6mm
x
3.5mm
Nickel
20mm
x
3mm
x
3mm
Nickel
20mm
x
20mm
x
5mm
Nickel
25mm
x
6mm
x
3.5mm
Nickel
25mm
x
10mm
x
3mm
Nickel
25mm
x
12.5mm
x
3.5mm
Nickel
25mm
x
12.5mm
x
6mm
Nickel
25mm
x
25mm
x
3mm
Nickel
25mm
x
25mm
x
5mm
Nickel
25.4mm
x
25.4mm
x
12.7mm
Nickel
30mm
x
10mm
x
6mm
Nickel
40mm
x
12mm
x
2mm
Nickel
40mm
x
15mm
x
8mm
Nickel
50mm
x
50mm
x
25mm
Nickel
50.8mm
x
20mm
x
6.35mm
Nickel
50.8mm
x
20mm
x
12.7mm
Nickel
50.8mm
x
25.4mm
x
12.7mm
Nickel
50.8mm
x
50.8mm
x
6.35mm
Nickel
50.8mm
x
50.8mm
x
12.7mm
Nickel
100mm
x
9mm
x
3mm
Nickel
100mm
x
25mm
x
12.7mm
Nickel
100mm
x
25mm
x
25mm
Nickel
100mm
x
50mm
x
25mm
Nickel
100mm
x
100mm
x
25mm
Nickel
150mm
x
25mm
x
25mm
Nickel

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Neodymium Shallow Pot Magnets

Diameter
Approximate Pull
16mm x 5mm Threaded Post
x
8kg (Approximately)
16mm x 5mm Countersunk
x
6kg (Approximately)
20mm x 7mm Countersunk
x
10kg (Approximately)
25mm x 8mm Threaded Post
x
22kg (Approximately)
25mm x 8mm Countersunk
x
18kg (Approximately)
25mm x 8mm With Hook
x
22kg (Approximately)
32mm x 8mm Countersunk
x
40kg (Approximately)
36mm x 9mm With Rebated Hole
x
40kg (Approximately)
36mm x 8mm With Hook
x
48kg (Approximately)
42mm x 9mm Countersunk
x
55kg (Approximately)
48mm x 11.5mm Threaded Post
x
85kg (Approximately)
48mm x 10mm Countersunk
x
75kg (Approximately)
60mm x 15mm With Rebated Hole
x
120kg (Approximately)
60mm x 15mm With Hook
x
150kg (Approximately)
88mm x 18mm With Rebated Hole
x
200kg (Approximately)

* Indicates that the pull is indicative only

NOTE: The pulling capacity of a magnet is significantly reduced by many factors including but not limited to the following:

  • Paint or other surface coatings.
  • Rust, holes, or other surface imperfections.
  • Being attached to steel that is too thin.
  • Temperatures that are either too high or too low.
  • Lubricants or other chemicals.
  • Other environmental factors.

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Ferrite Magnets

Common Name Ceramic magnets
Released onto the market Early 1950’s
Magnetic output Medium
Resistance to demagnetisation High
Relative cost Very cost effective (Low priced)
High temperature tolerance Good
Corrosion resistance Excellent
Surface finish Smooth (Dark grey in colour)
Physical characteristics Very hard and brittle
Workability Extremely difficult to machine or drill
Uses Widely used throughout many industries

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Ferrite Round Magnets

Diameter
Thickness
10mm
x
3mm
12mm
x
12mm
15mm
x
3mm
20mm
x
3mm
20mm
x
6mm
20mm
x
10mm
25mm
x
5mm
30mm
x
8mm
35mm
x
3mm
40mm
x
10mm
50mm
x
12mm
60mm
x
12mm
80mm
x
15mm

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Ferrite Ring Magnets

Outside Diameter
Inside Diameter
Thickness
12mm
x
5.7mm
x
10mm
15mm
x
3mm
x
6mm
20mm
x
4.5mm C/S
x
7mm
27mm
x
12.25mm
x
5mm
32mm
x
18mm
x
7mm
45mm
x
22mm
x
9mm
80mm
x
40mm
x
15mm
100mm
x
60mm
x
17mm
140mm
x
75mm
x
20mm
220mm
x
110mm
x
20mm

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Ferrite Block Magnets

Length
Width
Thickness
20mm
x
8mm
x
3mm
24mm
x
10mm
x
4mm
25mm
x
19mm
x
6mm
30mm
x
9mm
x
6mm
30mm
x
20mm
x
3mm
40mm
x
25mm
x
10mm
50mm
x
12mm
x
10mm
50mm
x
19mm
x
6mm
50mm
x
50mm
x
15mm
50mm
x
50mm
x
20mm
75mm
x
50mm
x
20mm
150mm
x
12mm
x
6mm
152mm
x
25mm
x
25mm
152mm
x
50mm
x
25mm
152mm
x
100mm
x
12.7mm
152mm
x
100mm
x
25mm

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Ferrite Shallow Pot Magnets

Diameter
Thickness
Approximate Lift
22mm*
x
4mm
n/a
32mm*
x
7mm
8kg (approx)
40mm*
x
8mm
10kg (approx)
50mm*
x
10mm
20kg (approx)
63mm*
x
13mm
30kg (approx)
90mm*
x
12mm
60kg (approx)
       

* Indicates that pull ratings are indicative only

NOTE: The pulling capacity of a magnet is significantly reduced by many factors including but not limited to the following:

  • Paint or other surface coatings.
  • Rust, holes, or other surface imperfections.
  • Being attached to steel that is too thin.
  • Temperatures that are either too high or too low.
  • Lubricants or other chemicals.
  • Other environmental factors.

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Samarium Cobalt Magnets (SmCo)

Released onto the market 1970
Magnetic output Very high strength
Resistance to demagnetisation High
Relative cost High
High temperature tolerance Excellent stability over a wide range
Corrosion resistance Excellent
Surface finish Can be plated in a range of finishes
Physical characteristics Very hard and brittle
Workability Extremely difficult to machine or drill
Uses

Used when high magnetic strength is required in high temperatures

 

Samarium Cobalt Magnets

 

Samarium Cobalt Magnet Sizes

Diameter
Thickness
3mm
x
2mm
5mm
x
2mm
5mm
x
5mm
6.35mm
x
12.7mm
7mm
x
5mm
10mm
x
1.5mm
10mm
x
3mm
12.5 mm
x
5mm
15mm
x
20mm
20 mm
x
5mm
25mm
x
10mm

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Alnico Magnets (Al-Ni-Co)

Component metals Aluminium, Nickel and Cobalt
Released onto the market 1940’s
Magnetic output Medium strength
Resistance to demagnetisation Poor
Relative cost Less cost effective as better alternatives have become available
High temperature tolerance Excellent stability over a wide range
Corrosion resistance Good
Surface finish Often painted red
Physical characteristics Often has a rough cast finish
Workability Can be machined and drilled with difficulty
Uses Used in high temperature environments

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Alnico Horseshoe Magnets

 

Alnico Horseshoe Magnet Sizes

Width
Height
Thickness
Leg Width
28mm
x
25mm
x
8mm
x
10mm
30mm
x
19mm
x
19mm
x
8mm
38mm
x
25mm
x
25mm
x
9mm
56mm
x
46mm
x
25mm
x
12.5mm
62mm
x
50mm
x
24mm
x
16mm
86mm
x
70mm
x
45mm
x
16mm

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Alnico Bar Magnets

Length
Width
Thickness
60mm
x
15mm
x
5mm
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Alnico Pot Magnets

Diameter
Thickness
17mm
x
15.9mm
25mm
x
16mm
28.6mm
x
9mm

 

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Extruded Strip

Common Name Mag Strip
Magnetic Output High strength to cost ratio
Resistance to demagnetisation Very high
Relative cost Low cost
High temperature tolerance Good
Corrosion resistance Poor on solvents (But good on many other chemicals)
Surface finish Can be plain or coated with adhesive
Physical characteristics Soft and flexible
Workability Can be cut with ease
Uses Widely used for promotional display boards

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Extruded Flexible Magnetic Strip

Width
Thickness
Roll Size
Type
Coating
12.7mm
1.5mm
30.5 metres
Matched Pole
Plain
12.7mm
1.5mm
30.5 metres
"A"
Adhesive
12.7mm
1.5mm
30.5 metres
"B"
Adhesive
25.4mm
1.5mm
30.5 metres
"A"
Adhesive
25.4mm
1.5mm
30.5 metres
"B"
Adhesive
9.75mm
3.15mm
30.5 metres
n/a
Fridge Seal
9.75mm
3.15mm
310 metres
n/a
Fridge Seal
10.0mm
4.0mm
30 metres
"A"
n/a
10.0mm
4.0mm
30 metres
"B"
n/a
Other Sizes available on request

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